From ad8d8f3bc61ec712dd141e1029ae68c47fadc4a7 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:28 -0200 Subject: lguest: per-vcpu lguest timers Here, I introduce per-vcpu timers. With this, we can have local expiries, needed for accounting time in smp guests Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/interrupts_and_traps.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 2b66f79c208b..22c692aae51c 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -470,13 +470,13 @@ void copy_traps(const struct lguest *lg, struct desc_struct *idt, * infrastructure to set a callback at that time. * * 0 means "turn off the clock". */ -void guest_set_clockevent(struct lguest *lg, unsigned long delta) +void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta) { ktime_t expires; if (unlikely(delta == 0)) { /* Clock event device is shutting down. */ - hrtimer_cancel(&lg->hrt); + hrtimer_cancel(&cpu->hrt); return; } @@ -484,25 +484,25 @@ void guest_set_clockevent(struct lguest *lg, unsigned long delta) * all the time between now and the timer interrupt it asked for. This * is almost always the right thing to do. */ expires = ktime_add_ns(ktime_get_real(), delta); - hrtimer_start(&lg->hrt, expires, HRTIMER_MODE_ABS); + hrtimer_start(&cpu->hrt, expires, HRTIMER_MODE_ABS); } /* This is the function called when the Guest's timer expires. */ static enum hrtimer_restart clockdev_fn(struct hrtimer *timer) { - struct lguest *lg = container_of(timer, struct lguest, hrt); + struct lg_cpu *cpu = container_of(timer, struct lg_cpu, hrt); /* Remember the first interrupt is the timer interrupt. */ - set_bit(0, lg->irqs_pending); + set_bit(0, cpu->lg->irqs_pending); /* If the Guest is actually stopped, we need to wake it up. */ - if (lg->halted) - wake_up_process(lg->tsk); + if (cpu->lg->halted) + wake_up_process(cpu->lg->tsk); return HRTIMER_NORESTART; } /* This sets up the timer for this Guest. */ -void init_clockdev(struct lguest *lg) +void init_clockdev(struct lg_cpu *cpu) { - hrtimer_init(&lg->hrt, CLOCK_REALTIME, HRTIMER_MODE_ABS); - lg->hrt.function = clockdev_fn; + hrtimer_init(&cpu->hrt, CLOCK_REALTIME, HRTIMER_MODE_ABS); + cpu->hrt.function = clockdev_fn; } -- cgit v1.2.3-59-g8ed1b From 177e449dc5bd4cf8dc48d66abee61ddf34b126b9 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:29 -0200 Subject: lguest: per-vcpu interrupt processing. This patch adapts interrupt processing for using the vcpu struct. Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/core.c | 2 +- drivers/lguest/interrupts_and_traps.c | 24 +++++++++++++----------- drivers/lguest/lg.h | 10 +++++----- drivers/lguest/lguest_user.c | 8 ++++---- drivers/lguest/x86/core.c | 2 +- 5 files changed, 24 insertions(+), 22 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index 0ea67cb0cc0b..d8e1ac305dc6 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -203,7 +203,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) /* Check if there are any interrupts which can be delivered * now: if so, this sets up the hander to be executed when we * next run the Guest. */ - maybe_do_interrupt(lg); + maybe_do_interrupt(cpu); /* All long-lived kernel loops need to check with this horrible * thing called the freezer. If the Host is trying to suspend, diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 22c692aae51c..8f59232f458b 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -60,11 +60,12 @@ static void push_guest_stack(struct lguest *lg, unsigned long *gstack, u32 val) * We set up the stack just like the CPU does for a real interrupt, so it's * identical for the Guest (and the standard "iret" instruction will undo * it). */ -static void set_guest_interrupt(struct lguest *lg, u32 lo, u32 hi, int has_err) +static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) { unsigned long gstack, origstack; u32 eflags, ss, irq_enable; unsigned long virtstack; + struct lguest *lg = cpu->lg; /* There are two cases for interrupts: one where the Guest is already * in the kernel, and a more complex one where the Guest is in @@ -129,9 +130,10 @@ static void set_guest_interrupt(struct lguest *lg, u32 lo, u32 hi, int has_err) * * maybe_do_interrupt() gets called before every entry to the Guest, to see if * we should divert the Guest to running an interrupt handler. */ -void maybe_do_interrupt(struct lguest *lg) +void maybe_do_interrupt(struct lg_cpu *cpu) { unsigned int irq; + struct lguest *lg = cpu->lg; DECLARE_BITMAP(blk, LGUEST_IRQS); struct desc_struct *idt; @@ -145,7 +147,7 @@ void maybe_do_interrupt(struct lguest *lg) sizeof(blk))) return; - bitmap_andnot(blk, lg->irqs_pending, blk, LGUEST_IRQS); + bitmap_andnot(blk, cpu->irqs_pending, blk, LGUEST_IRQS); /* Find the first interrupt. */ irq = find_first_bit(blk, LGUEST_IRQS); @@ -180,11 +182,11 @@ void maybe_do_interrupt(struct lguest *lg) /* If they don't have a handler (yet?), we just ignore it */ if (idt_present(idt->a, idt->b)) { /* OK, mark it no longer pending and deliver it. */ - clear_bit(irq, lg->irqs_pending); + clear_bit(irq, cpu->irqs_pending); /* set_guest_interrupt() takes the interrupt descriptor and a * flag to say whether this interrupt pushes an error code onto * the stack as well: virtual interrupts never do. */ - set_guest_interrupt(lg, idt->a, idt->b, 0); + set_guest_interrupt(cpu, idt->a, idt->b, 0); } /* Every time we deliver an interrupt, we update the timestamp in the @@ -245,19 +247,19 @@ static int has_err(unsigned int trap) } /* deliver_trap() returns true if it could deliver the trap. */ -int deliver_trap(struct lguest *lg, unsigned int num) +int deliver_trap(struct lg_cpu *cpu, unsigned int num) { /* Trap numbers are always 8 bit, but we set an impossible trap number * for traps inside the Switcher, so check that here. */ - if (num >= ARRAY_SIZE(lg->arch.idt)) + if (num >= ARRAY_SIZE(cpu->lg->arch.idt)) return 0; /* Early on the Guest hasn't set the IDT entries (or maybe it put a * bogus one in): if we fail here, the Guest will be killed. */ - if (!idt_present(lg->arch.idt[num].a, lg->arch.idt[num].b)) + if (!idt_present(cpu->lg->arch.idt[num].a, cpu->lg->arch.idt[num].b)) return 0; - set_guest_interrupt(lg, lg->arch.idt[num].a, lg->arch.idt[num].b, - has_err(num)); + set_guest_interrupt(cpu, cpu->lg->arch.idt[num].a, + cpu->lg->arch.idt[num].b, has_err(num)); return 1; } @@ -493,7 +495,7 @@ static enum hrtimer_restart clockdev_fn(struct hrtimer *timer) struct lg_cpu *cpu = container_of(timer, struct lg_cpu, hrt); /* Remember the first interrupt is the timer interrupt. */ - set_bit(0, cpu->lg->irqs_pending); + set_bit(0, cpu->irqs_pending); /* If the Guest is actually stopped, we need to wake it up. */ if (cpu->lg->halted) wake_up_process(cpu->lg->tsk); diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 7da7b3f68da8..29e03d588a8d 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -50,6 +50,9 @@ struct lg_cpu { /* Virtual clock device */ struct hrtimer hrt; + + /* Pending virtual interrupts */ + DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); }; /* The private info the thread maintains about the guest. */ @@ -97,9 +100,6 @@ struct lguest const char *dead; struct lguest_arch arch; - - /* Pending virtual interrupts */ - DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); }; extern struct mutex lguest_lock; @@ -136,8 +136,8 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user); #define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT) /* interrupts_and_traps.c: */ -void maybe_do_interrupt(struct lguest *lg); -int deliver_trap(struct lguest *lg, unsigned int num); +void maybe_do_interrupt(struct lg_cpu *cpu); +int deliver_trap(struct lg_cpu *cpu, unsigned int num); void load_guest_idt_entry(struct lguest *lg, unsigned int i, u32 low, u32 hi); void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages); void pin_stack_pages(struct lguest *lg); diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index f231b9be0b64..605db5c49e7f 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -36,7 +36,7 @@ static int break_guest_out(struct lguest *lg, const unsigned long __user *input) /*L:050 Sending an interrupt is done by writing LHREQ_IRQ and an interrupt * number to /dev/lguest. */ -static int user_send_irq(struct lguest *lg, const unsigned long __user *input) +static int user_send_irq(struct lg_cpu *cpu, const unsigned long __user *input) { unsigned long irq; @@ -46,7 +46,7 @@ static int user_send_irq(struct lguest *lg, const unsigned long __user *input) return -EINVAL; /* Next time the Guest runs, the core code will see if it can deliver * this interrupt. */ - set_bit(irq, lg->irqs_pending); + set_bit(irq, cpu->irqs_pending); return 0; } @@ -225,7 +225,7 @@ static ssize_t write(struct file *file, const char __user *in, struct lguest *lg = file->private_data; const unsigned long __user *input = (const unsigned long __user *)in; unsigned long req; - struct lg_cpu *cpu; + struct lg_cpu *uninitialized_var(cpu); unsigned int cpu_id = *off; if (get_user(req, input) != 0) @@ -253,7 +253,7 @@ static ssize_t write(struct file *file, const char __user *in, case LHREQ_INITIALIZE: return initialize(file, input); case LHREQ_IRQ: - return user_send_irq(lg, input); + return user_send_irq(cpu, input); case LHREQ_BREAK: return break_guest_out(lg, input); default: diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 5962160aff3d..66f48fcc1196 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -342,7 +342,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) } /* We didn't handle the trap, so it needs to go to the Guest. */ - if (!deliver_trap(lg, lg->regs->trapnum)) + if (!deliver_trap(cpu, lg->regs->trapnum)) /* If the Guest doesn't have a handler (either it hasn't * registered any yet, or it's one of the faults we don't let * it handle), it dies with a cryptic error message. */ -- cgit v1.2.3-59-g8ed1b From a53a35a8b485b9c16b73e5177bddaa4321971199 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:32 -0200 Subject: lguest: make registers per-vcpu This is the most obvious per-vcpu field: registers. So this patch moves it from struct lguest to struct vcpu, and patch the places in which they are used, accordingly Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/interrupts_and_traps.c | 28 +++++++++++++------------- drivers/lguest/lg.h | 9 +++++---- drivers/lguest/lguest_user.c | 37 +++++++++++++++++----------------- drivers/lguest/page_tables.c | 4 +++- drivers/lguest/x86/core.c | 38 +++++++++++++++++------------------ 5 files changed, 60 insertions(+), 56 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 8f59232f458b..468faf8233d6 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -70,7 +70,7 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) /* There are two cases for interrupts: one where the Guest is already * in the kernel, and a more complex one where the Guest is in * userspace. We check the privilege level to find out. */ - if ((lg->regs->ss&0x3) != GUEST_PL) { + if ((cpu->regs->ss&0x3) != GUEST_PL) { /* The Guest told us their kernel stack with the SET_STACK * hypercall: both the virtual address and the segment */ virtstack = lg->esp1; @@ -81,12 +81,12 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) * stack: when the Guest does an "iret" back from the interrupt * handler the CPU will notice they're dropping privilege * levels and expect these here. */ - push_guest_stack(lg, &gstack, lg->regs->ss); - push_guest_stack(lg, &gstack, lg->regs->esp); + push_guest_stack(lg, &gstack, cpu->regs->ss); + push_guest_stack(lg, &gstack, cpu->regs->esp); } else { /* We're staying on the same Guest (kernel) stack. */ - virtstack = lg->regs->esp; - ss = lg->regs->ss; + virtstack = cpu->regs->esp; + ss = cpu->regs->ss; origstack = gstack = guest_pa(lg, virtstack); } @@ -95,7 +95,7 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) * the "Interrupt Flag" bit is always set. We copy that bit from the * Guest's "irq_enabled" field into the eflags word: we saw the Guest * copy it back in "lguest_iret". */ - eflags = lg->regs->eflags; + eflags = cpu->regs->eflags; if (get_user(irq_enable, &lg->lguest_data->irq_enabled) == 0 && !(irq_enable & X86_EFLAGS_IF)) eflags &= ~X86_EFLAGS_IF; @@ -104,19 +104,19 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) * "eflags" word, the old code segment, and the old instruction * pointer. */ push_guest_stack(lg, &gstack, eflags); - push_guest_stack(lg, &gstack, lg->regs->cs); - push_guest_stack(lg, &gstack, lg->regs->eip); + push_guest_stack(lg, &gstack, cpu->regs->cs); + push_guest_stack(lg, &gstack, cpu->regs->eip); /* For the six traps which supply an error code, we push that, too. */ if (has_err) - push_guest_stack(lg, &gstack, lg->regs->errcode); + push_guest_stack(lg, &gstack, cpu->regs->errcode); /* Now we've pushed all the old state, we change the stack, the code * segment and the address to execute. */ - lg->regs->ss = ss; - lg->regs->esp = virtstack + (gstack - origstack); - lg->regs->cs = (__KERNEL_CS|GUEST_PL); - lg->regs->eip = idt_address(lo, hi); + cpu->regs->ss = ss; + cpu->regs->esp = virtstack + (gstack - origstack); + cpu->regs->cs = (__KERNEL_CS|GUEST_PL); + cpu->regs->eip = idt_address(lo, hi); /* There are two kinds of interrupt handlers: 0xE is an "interrupt * gate" which expects interrupts to be disabled on entry. */ @@ -157,7 +157,7 @@ void maybe_do_interrupt(struct lg_cpu *cpu) /* They may be in the middle of an iret, where they asked us never to * deliver interrupts. */ - if (lg->regs->eip >= lg->noirq_start && lg->regs->eip < lg->noirq_end) + if (cpu->regs->eip >= lg->noirq_start && cpu->regs->eip < lg->noirq_end) return; /* If they're halted, interrupts restart them. */ diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 072d0d4fd0b9..35b331230c55 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -44,6 +44,10 @@ struct lg_cpu { unsigned int id; struct lguest *lg; + /* At end of a page shared mapped over lguest_pages in guest. */ + unsigned long regs_page; + struct lguest_regs *regs; + /* If a hypercall was asked for, this points to the arguments. */ struct hcall_args *hcall; u32 next_hcall; @@ -58,9 +62,6 @@ struct lg_cpu { /* The private info the thread maintains about the guest. */ struct lguest { - /* At end of a page shared mapped over lguest_pages in guest. */ - unsigned long regs_page; - struct lguest_regs *regs; struct lguest_data __user *lguest_data; struct task_struct *tsk; struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ @@ -181,7 +182,7 @@ void lguest_arch_run_guest(struct lg_cpu *cpu); void lguest_arch_handle_trap(struct lg_cpu *cpu); int lguest_arch_init_hypercalls(struct lg_cpu *cpu); int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args); -void lguest_arch_setup_regs(struct lguest *lg, unsigned long start); +void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start); /* /switcher.S: */ extern char start_switcher_text[], end_switcher_text[], switch_to_guest[]; diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index 605db5c49e7f..d21d95b2b1fc 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -106,6 +106,19 @@ static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip) cpu->lg->nr_cpus++; init_clockdev(cpu); + /* We need a complete page for the Guest registers: they are accessible + * to the Guest and we can only grant it access to whole pages. */ + cpu->regs_page = get_zeroed_page(GFP_KERNEL); + if (!cpu->regs_page) + return -ENOMEM; + + /* We actually put the registers at the bottom of the page. */ + cpu->regs = (void *)cpu->regs_page + PAGE_SIZE - sizeof(*cpu->regs); + + /* Now we initialize the Guest's registers, handing it the start + * address. */ + lguest_arch_setup_regs(cpu, start_ip); + return 0; } @@ -160,16 +173,6 @@ static int initialize(struct file *file, const unsigned long __user *input) if (err) goto release_guest; - /* We need a complete page for the Guest registers: they are accessible - * to the Guest and we can only grant it access to whole pages. */ - lg->regs_page = get_zeroed_page(GFP_KERNEL); - if (!lg->regs_page) { - err = -ENOMEM; - goto release_guest; - } - /* We actually put the registers at the bottom of the page. */ - lg->regs = (void *)lg->regs_page + PAGE_SIZE - sizeof(*lg->regs); - /* Initialize the Guest's shadow page tables, using the toplevel * address the Launcher gave us. This allocates memory, so can * fail. */ @@ -177,10 +180,6 @@ static int initialize(struct file *file, const unsigned long __user *input) if (err) goto free_regs; - /* Now we initialize the Guest's registers, handing it the start - * address. */ - lguest_arch_setup_regs(lg, args[3]); - /* We keep a pointer to the Launcher task (ie. current task) for when * other Guests want to wake this one (inter-Guest I/O). */ lg->tsk = current; @@ -205,7 +204,8 @@ static int initialize(struct file *file, const unsigned long __user *input) return sizeof(args); free_regs: - free_page(lg->regs_page); + /* FIXME: This should be in free_vcpu */ + free_page(lg->cpus[0].regs_page); release_guest: kfree(lg); unlock: @@ -280,9 +280,12 @@ static int close(struct inode *inode, struct file *file) /* We need the big lock, to protect from inter-guest I/O and other * Launchers initializing guests. */ mutex_lock(&lguest_lock); - for (i = 0; i < lg->nr_cpus; i++) + for (i = 0; i < lg->nr_cpus; i++) { /* Cancels the hrtimer set via LHCALL_SET_CLOCKEVENT. */ hrtimer_cancel(&lg->cpus[i].hrt); + /* We can free up the register page we allocated. */ + free_page(lg->cpus[i].regs_page); + } /* Free up the shadow page tables for the Guest. */ free_guest_pagetable(lg); /* Now all the memory cleanups are done, it's safe to release the @@ -292,8 +295,6 @@ static int close(struct inode *inode, struct file *file) * kmalloc()ed string, either of which is ok to hand to kfree(). */ if (!IS_ERR(lg->dead)) kfree(lg->dead); - /* We can free up the register page we allocated. */ - free_page(lg->regs_page); /* We clear the entire structure, which also marks it as free for the * next user. */ memset(lg, 0, sizeof(*lg)); diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index 17d3329e34c2..f19add469944 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -640,6 +640,7 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages) pte_t *switcher_pte_page = __get_cpu_var(switcher_pte_pages); pgd_t switcher_pgd; pte_t regs_pte; + unsigned long pfn; /* Make the last PGD entry for this Guest point to the Switcher's PTE * page for this CPU (with appropriate flags). */ @@ -654,7 +655,8 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages) * CPU's "struct lguest_pages": if we make sure the Guest's register * page is already mapped there, we don't have to copy them out * again. */ - regs_pte = pfn_pte (__pa(lg->regs_page) >> PAGE_SHIFT, __pgprot(_PAGE_KERNEL)); + pfn = __pa(cpu->regs_page) >> PAGE_SHIFT; + regs_pte = pfn_pte(pfn, __pgprot(_PAGE_KERNEL)); switcher_pte_page[(unsigned long)pages/PAGE_SIZE%PTRS_PER_PTE] = regs_pte; } /*:*/ diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index ae46c6b1f2f9..d96a93d95aea 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -127,7 +127,7 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages) /* Set the trap number to 256 (impossible value). If we fault while * switching to the Guest (bad segment registers or bug), this will * cause us to abort the Guest. */ - lg->regs->trapnum = 256; + cpu->regs->trapnum = 256; /* Now: we push the "eflags" register on the stack, then do an "lcall". * This is how we change from using the kernel code segment to using @@ -195,11 +195,11 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) * bad virtual address. We have to grab this now, because once we * re-enable interrupts an interrupt could fault and thus overwrite * cr2, or we could even move off to a different CPU. */ - if (lg->regs->trapnum == 14) + if (cpu->regs->trapnum == 14) lg->arch.last_pagefault = read_cr2(); /* Similarly, if we took a trap because the Guest used the FPU, * we have to restore the FPU it expects to see. */ - else if (lg->regs->trapnum == 7) + else if (cpu->regs->trapnum == 7) math_state_restore(); /* Restore SYSENTER if it's supposed to be on. */ @@ -225,12 +225,12 @@ static int emulate_insn(struct lg_cpu *cpu) unsigned int insnlen = 0, in = 0, shift = 0; /* The eip contains the *virtual* address of the Guest's instruction: * guest_pa just subtracts the Guest's page_offset. */ - unsigned long physaddr = guest_pa(lg, lg->regs->eip); + unsigned long physaddr = guest_pa(lg, cpu->regs->eip); /* This must be the Guest kernel trying to do something, not userspace! * The bottom two bits of the CS segment register are the privilege * level. */ - if ((lg->regs->cs & 3) != GUEST_PL) + if ((cpu->regs->cs & 3) != GUEST_PL) return 0; /* Decoding x86 instructions is icky. */ @@ -273,12 +273,12 @@ static int emulate_insn(struct lg_cpu *cpu) if (in) { /* Lower bit tells is whether it's a 16 or 32 bit access */ if (insn & 0x1) - lg->regs->eax = 0xFFFFFFFF; + cpu->regs->eax = 0xFFFFFFFF; else - lg->regs->eax |= (0xFFFF << shift); + cpu->regs->eax |= (0xFFFF << shift); } /* Finally, we've "done" the instruction, so move past it. */ - lg->regs->eip += insnlen; + cpu->regs->eip += insnlen; /* Success! */ return 1; } @@ -287,12 +287,12 @@ static int emulate_insn(struct lg_cpu *cpu) void lguest_arch_handle_trap(struct lg_cpu *cpu) { struct lguest *lg = cpu->lg; - switch (lg->regs->trapnum) { + switch (cpu->regs->trapnum) { case 13: /* We've intercepted a General Protection Fault. */ /* Check if this was one of those annoying IN or OUT * instructions which we need to emulate. If so, we just go * back into the Guest after we've done it. */ - if (lg->regs->errcode == 0) { + if (cpu->regs->errcode == 0) { if (emulate_insn(cpu)) return; } @@ -307,7 +307,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) * * The errcode tells whether this was a read or a write, and * whether kernel or userspace code. */ - if (demand_page(lg, lg->arch.last_pagefault, lg->regs->errcode)) + if (demand_page(lg, lg->arch.last_pagefault, cpu->regs->errcode)) return; /* OK, it's really not there (or not OK): the Guest needs to @@ -338,19 +338,19 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) case LGUEST_TRAP_ENTRY: /* Our 'struct hcall_args' maps directly over our regs: we set * up the pointer now to indicate a hypercall is pending. */ - cpu->hcall = (struct hcall_args *)lg->regs; + cpu->hcall = (struct hcall_args *)cpu->regs; return; } /* We didn't handle the trap, so it needs to go to the Guest. */ - if (!deliver_trap(cpu, lg->regs->trapnum)) + if (!deliver_trap(cpu, cpu->regs->trapnum)) /* If the Guest doesn't have a handler (either it hasn't * registered any yet, or it's one of the faults we don't let * it handle), it dies with a cryptic error message. */ kill_guest(lg, "unhandled trap %li at %#lx (%#lx)", - lg->regs->trapnum, lg->regs->eip, - lg->regs->trapnum == 14 ? lg->arch.last_pagefault - : lg->regs->errcode); + cpu->regs->trapnum, cpu->regs->eip, + cpu->regs->trapnum == 14 ? lg->arch.last_pagefault + : cpu->regs->errcode); } /* Now we can look at each of the routines this calls, in increasing order of @@ -557,9 +557,9 @@ int lguest_arch_init_hypercalls(struct lg_cpu *cpu) * * Most of the Guest's registers are left alone: we used get_zeroed_page() to * allocate the structure, so they will be 0. */ -void lguest_arch_setup_regs(struct lguest *lg, unsigned long start) +void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start) { - struct lguest_regs *regs = lg->regs; + struct lguest_regs *regs = cpu->regs; /* There are four "segment" registers which the Guest needs to boot: * The "code segment" register (cs) refers to the kernel code segment @@ -586,5 +586,5 @@ void lguest_arch_setup_regs(struct lguest *lg, unsigned long start) /* There are a couple of GDT entries the Guest expects when first * booting. */ - setup_guest_gdt(lg); + setup_guest_gdt(cpu->lg); } -- cgit v1.2.3-59-g8ed1b From fc708b3e407dfd2e12ba9a6cf35bd0bffad1796d Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:33 -0200 Subject: lguest: replace lguest_arch with lg_cpu_arch. The fields found in lguest_arch are not really per-guest, but per-cpu (gdt, idt, etc). So this patch turns lguest_arch into lg_cpu_arch. It makes sense to have a per-guest per-arch struct, but this can be addressed later, when the need arrives. Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/interrupts_and_traps.c | 28 +++++++++++------------ drivers/lguest/lg.h | 19 ++++++++-------- drivers/lguest/segments.c | 42 ++++++++++++++++++----------------- drivers/lguest/x86/core.c | 24 +++++++++----------- include/asm-x86/lguest.h | 2 +- 5 files changed, 58 insertions(+), 57 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 468faf8233d6..306b93c71dcc 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -178,7 +178,7 @@ void maybe_do_interrupt(struct lg_cpu *cpu) /* Look at the IDT entry the Guest gave us for this interrupt. The * first 32 (FIRST_EXTERNAL_VECTOR) entries are for traps, so we skip * over them. */ - idt = &lg->arch.idt[FIRST_EXTERNAL_VECTOR+irq]; + idt = &cpu->arch.idt[FIRST_EXTERNAL_VECTOR+irq]; /* If they don't have a handler (yet?), we just ignore it */ if (idt_present(idt->a, idt->b)) { /* OK, mark it no longer pending and deliver it. */ @@ -251,15 +251,15 @@ int deliver_trap(struct lg_cpu *cpu, unsigned int num) { /* Trap numbers are always 8 bit, but we set an impossible trap number * for traps inside the Switcher, so check that here. */ - if (num >= ARRAY_SIZE(cpu->lg->arch.idt)) + if (num >= ARRAY_SIZE(cpu->arch.idt)) return 0; /* Early on the Guest hasn't set the IDT entries (or maybe it put a * bogus one in): if we fail here, the Guest will be killed. */ - if (!idt_present(cpu->lg->arch.idt[num].a, cpu->lg->arch.idt[num].b)) + if (!idt_present(cpu->arch.idt[num].a, cpu->arch.idt[num].b)) return 0; - set_guest_interrupt(cpu, cpu->lg->arch.idt[num].a, - cpu->lg->arch.idt[num].b, has_err(num)); + set_guest_interrupt(cpu, cpu->arch.idt[num].a, + cpu->arch.idt[num].b, has_err(num)); return 1; } @@ -385,7 +385,7 @@ static void set_trap(struct lguest *lg, struct desc_struct *trap, * * We saw the Guest setting Interrupt Descriptor Table (IDT) entries with the * LHCALL_LOAD_IDT_ENTRY hypercall before: that comes here. */ -void load_guest_idt_entry(struct lguest *lg, unsigned int num, u32 lo, u32 hi) +void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int num, u32 lo, u32 hi) { /* Guest never handles: NMI, doublefault, spurious interrupt or * hypercall. We ignore when it tries to set them. */ @@ -394,13 +394,13 @@ void load_guest_idt_entry(struct lguest *lg, unsigned int num, u32 lo, u32 hi) /* Mark the IDT as changed: next time the Guest runs we'll know we have * to copy this again. */ - lg->changed |= CHANGED_IDT; + cpu->lg->changed |= CHANGED_IDT; /* Check that the Guest doesn't try to step outside the bounds. */ - if (num >= ARRAY_SIZE(lg->arch.idt)) - kill_guest(lg, "Setting idt entry %u", num); + if (num >= ARRAY_SIZE(cpu->arch.idt)) + kill_guest(cpu->lg, "Setting idt entry %u", num); else - set_trap(lg, &lg->arch.idt[num], num, lo, hi); + set_trap(cpu->lg, &cpu->arch.idt[num], num, lo, hi); } /* The default entry for each interrupt points into the Switcher routines which @@ -436,14 +436,14 @@ void setup_default_idt_entries(struct lguest_ro_state *state, /*H:240 We don't use the IDT entries in the "struct lguest" directly, instead * we copy them into the IDT which we've set up for Guests on this CPU, just * before we run the Guest. This routine does that copy. */ -void copy_traps(const struct lguest *lg, struct desc_struct *idt, +void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt, const unsigned long *def) { unsigned int i; /* We can simply copy the direct traps, otherwise we use the default * ones in the Switcher: they will return to the Host. */ - for (i = 0; i < ARRAY_SIZE(lg->arch.idt); i++) { + for (i = 0; i < ARRAY_SIZE(cpu->arch.idt); i++) { /* If no Guest can ever override this trap, leave it alone. */ if (!direct_trap(i)) continue; @@ -452,8 +452,8 @@ void copy_traps(const struct lguest *lg, struct desc_struct *idt, * Interrupt gates (type 14) disable interrupts as they are * entered, which we never let the Guest do. Not present * entries (type 0x0) also can't go direct, of course. */ - if (idt_type(lg->arch.idt[i].a, lg->arch.idt[i].b) == 0xF) - idt[i] = lg->arch.idt[i]; + if (idt_type(cpu->arch.idt[i].a, cpu->arch.idt[i].b) == 0xF) + idt[i] = cpu->arch.idt[i]; else /* Reset it to the default. */ default_idt_entry(&idt[i], i, def[i]); diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 35b331230c55..d08b85342b92 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -57,6 +57,8 @@ struct lg_cpu { /* Pending virtual interrupts */ DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); + + struct lg_cpu_arch arch; }; /* The private info the thread maintains about the guest. */ @@ -99,8 +101,6 @@ struct lguest /* Dead? */ const char *dead; - - struct lguest_arch arch; }; extern struct mutex lguest_lock; @@ -139,12 +139,13 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user); /* interrupts_and_traps.c: */ void maybe_do_interrupt(struct lg_cpu *cpu); int deliver_trap(struct lg_cpu *cpu, unsigned int num); -void load_guest_idt_entry(struct lguest *lg, unsigned int i, u32 low, u32 hi); +void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i, + u32 low, u32 hi); void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages); void pin_stack_pages(struct lguest *lg); void setup_default_idt_entries(struct lguest_ro_state *state, const unsigned long *def); -void copy_traps(const struct lguest *lg, struct desc_struct *idt, +void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt, const unsigned long *def); void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta); void init_clockdev(struct lg_cpu *cpu); @@ -154,11 +155,11 @@ void free_interrupts(void); /* segments.c: */ void setup_default_gdt_entries(struct lguest_ro_state *state); -void setup_guest_gdt(struct lguest *lg); -void load_guest_gdt(struct lguest *lg, unsigned long table, u32 num); -void guest_load_tls(struct lguest *lg, unsigned long tls_array); -void copy_gdt(const struct lguest *lg, struct desc_struct *gdt); -void copy_gdt_tls(const struct lguest *lg, struct desc_struct *gdt); +void setup_guest_gdt(struct lg_cpu *cpu); +void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num); +void guest_load_tls(struct lg_cpu *cpu, unsigned long tls_array); +void copy_gdt(const struct lg_cpu *cpu, struct desc_struct *gdt); +void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt); /* page_tables.c: */ int init_guest_pagetable(struct lguest *lg, unsigned long pgtable); diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c index 9e189cbec7dd..02138450ecf5 100644 --- a/drivers/lguest/segments.c +++ b/drivers/lguest/segments.c @@ -58,7 +58,7 @@ static int ignored_gdt(unsigned int num) * Protection Fault in the Switcher when it restores a Guest segment register * which tries to use that entry. Then we kill the Guest for causing such a * mess: the message will be "unhandled trap 256". */ -static void fixup_gdt_table(struct lguest *lg, unsigned start, unsigned end) +static void fixup_gdt_table(struct lg_cpu *cpu, unsigned start, unsigned end) { unsigned int i; @@ -71,14 +71,14 @@ static void fixup_gdt_table(struct lguest *lg, unsigned start, unsigned end) /* Segment descriptors contain a privilege level: the Guest is * sometimes careless and leaves this as 0, even though it's * running at privilege level 1. If so, we fix it here. */ - if ((lg->arch.gdt[i].b & 0x00006000) == 0) - lg->arch.gdt[i].b |= (GUEST_PL << 13); + if ((cpu->arch.gdt[i].b & 0x00006000) == 0) + cpu->arch.gdt[i].b |= (GUEST_PL << 13); /* Each descriptor has an "accessed" bit. If we don't set it * now, the CPU will try to set it when the Guest first loads * that entry into a segment register. But the GDT isn't * writable by the Guest, so bad things can happen. */ - lg->arch.gdt[i].b |= 0x00000100; + cpu->arch.gdt[i].b |= 0x00000100; } } @@ -109,31 +109,31 @@ void setup_default_gdt_entries(struct lguest_ro_state *state) /* This routine sets up the initial Guest GDT for booting. All entries start * as 0 (unusable). */ -void setup_guest_gdt(struct lguest *lg) +void setup_guest_gdt(struct lg_cpu *cpu) { /* Start with full 0-4G segments... */ - lg->arch.gdt[GDT_ENTRY_KERNEL_CS] = FULL_EXEC_SEGMENT; - lg->arch.gdt[GDT_ENTRY_KERNEL_DS] = FULL_SEGMENT; + cpu->arch.gdt[GDT_ENTRY_KERNEL_CS] = FULL_EXEC_SEGMENT; + cpu->arch.gdt[GDT_ENTRY_KERNEL_DS] = FULL_SEGMENT; /* ...except the Guest is allowed to use them, so set the privilege * level appropriately in the flags. */ - lg->arch.gdt[GDT_ENTRY_KERNEL_CS].b |= (GUEST_PL << 13); - lg->arch.gdt[GDT_ENTRY_KERNEL_DS].b |= (GUEST_PL << 13); + cpu->arch.gdt[GDT_ENTRY_KERNEL_CS].b |= (GUEST_PL << 13); + cpu->arch.gdt[GDT_ENTRY_KERNEL_DS].b |= (GUEST_PL << 13); } /*H:650 An optimization of copy_gdt(), for just the three "thead-local storage" * entries. */ -void copy_gdt_tls(const struct lguest *lg, struct desc_struct *gdt) +void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt) { unsigned int i; for (i = GDT_ENTRY_TLS_MIN; i <= GDT_ENTRY_TLS_MAX; i++) - gdt[i] = lg->arch.gdt[i]; + gdt[i] = cpu->arch.gdt[i]; } /*H:640 When the Guest is run on a different CPU, or the GDT entries have * changed, copy_gdt() is called to copy the Guest's GDT entries across to this * CPU's GDT. */ -void copy_gdt(const struct lguest *lg, struct desc_struct *gdt) +void copy_gdt(const struct lg_cpu *cpu, struct desc_struct *gdt) { unsigned int i; @@ -141,21 +141,22 @@ void copy_gdt(const struct lguest *lg, struct desc_struct *gdt) * replaced. See ignored_gdt() above. */ for (i = 0; i < GDT_ENTRIES; i++) if (!ignored_gdt(i)) - gdt[i] = lg->arch.gdt[i]; + gdt[i] = cpu->arch.gdt[i]; } /*H:620 This is where the Guest asks us to load a new GDT (LHCALL_LOAD_GDT). * We copy it from the Guest and tweak the entries. */ -void load_guest_gdt(struct lguest *lg, unsigned long table, u32 num) +void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num) { + struct lguest *lg = cpu->lg; /* We assume the Guest has the same number of GDT entries as the * Host, otherwise we'd have to dynamically allocate the Guest GDT. */ - if (num > ARRAY_SIZE(lg->arch.gdt)) + if (num > ARRAY_SIZE(cpu->arch.gdt)) kill_guest(lg, "too many gdt entries %i", num); /* We read the whole thing in, then fix it up. */ - __lgread(lg, lg->arch.gdt, table, num * sizeof(lg->arch.gdt[0])); - fixup_gdt_table(lg, 0, ARRAY_SIZE(lg->arch.gdt)); + __lgread(lg, cpu->arch.gdt, table, num * sizeof(cpu->arch.gdt[0])); + fixup_gdt_table(cpu, 0, ARRAY_SIZE(cpu->arch.gdt)); /* Mark that the GDT changed so the core knows it has to copy it again, * even if the Guest is run on the same CPU. */ lg->changed |= CHANGED_GDT; @@ -165,12 +166,13 @@ void load_guest_gdt(struct lguest *lg, unsigned long table, u32 num) * Remember that this happens on every context switch, so it's worth * optimizing. But wouldn't it be neater to have a single hypercall to cover * both cases? */ -void guest_load_tls(struct lguest *lg, unsigned long gtls) +void guest_load_tls(struct lg_cpu *cpu, unsigned long gtls) { - struct desc_struct *tls = &lg->arch.gdt[GDT_ENTRY_TLS_MIN]; + struct desc_struct *tls = &cpu->arch.gdt[GDT_ENTRY_TLS_MIN]; + struct lguest *lg = cpu->lg; __lgread(lg, tls, gtls, sizeof(*tls)*GDT_ENTRY_TLS_ENTRIES); - fixup_gdt_table(lg, GDT_ENTRY_TLS_MIN, GDT_ENTRY_TLS_MAX+1); + fixup_gdt_table(cpu, GDT_ENTRY_TLS_MIN, GDT_ENTRY_TLS_MAX+1); /* Note that just the TLS entries have changed. */ lg->changed |= CHANGED_GDT_TLS; } diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index d96a93d95aea..e989b8358864 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -100,14 +100,14 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) /* Copy direct-to-Guest trap entries. */ if (lg->changed & CHANGED_IDT) - copy_traps(lg, pages->state.guest_idt, default_idt_entries); + copy_traps(cpu, pages->state.guest_idt, default_idt_entries); /* Copy all GDT entries which the Guest can change. */ if (lg->changed & CHANGED_GDT) - copy_gdt(lg, pages->state.guest_gdt); + copy_gdt(cpu, pages->state.guest_gdt); /* If only the TLS entries have changed, copy them. */ else if (lg->changed & CHANGED_GDT_TLS) - copy_gdt_tls(lg, pages->state.guest_gdt); + copy_gdt_tls(cpu, pages->state.guest_gdt); /* Mark the Guest as unchanged for next time. */ lg->changed = 0; @@ -196,7 +196,7 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) * re-enable interrupts an interrupt could fault and thus overwrite * cr2, or we could even move off to a different CPU. */ if (cpu->regs->trapnum == 14) - lg->arch.last_pagefault = read_cr2(); + cpu->arch.last_pagefault = read_cr2(); /* Similarly, if we took a trap because the Guest used the FPU, * we have to restore the FPU it expects to see. */ else if (cpu->regs->trapnum == 7) @@ -307,7 +307,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) * * The errcode tells whether this was a read or a write, and * whether kernel or userspace code. */ - if (demand_page(lg, lg->arch.last_pagefault, cpu->regs->errcode)) + if (demand_page(lg,cpu->arch.last_pagefault,cpu->regs->errcode)) return; /* OK, it's really not there (or not OK): the Guest needs to @@ -318,7 +318,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) * happen before it's done the LHCALL_LGUEST_INIT hypercall, so * lg->lguest_data could be NULL */ if (lg->lguest_data && - put_user(lg->arch.last_pagefault, &lg->lguest_data->cr2)) + put_user(cpu->arch.last_pagefault, &lg->lguest_data->cr2)) kill_guest(lg, "Writing cr2"); break; case 7: /* We've intercepted a Device Not Available fault. */ @@ -349,7 +349,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) * it handle), it dies with a cryptic error message. */ kill_guest(lg, "unhandled trap %li at %#lx (%#lx)", cpu->regs->trapnum, cpu->regs->eip, - cpu->regs->trapnum == 14 ? lg->arch.last_pagefault + cpu->regs->trapnum == 14 ? cpu->arch.last_pagefault : cpu->regs->errcode); } @@ -495,17 +495,15 @@ void __exit lguest_arch_host_fini(void) /*H:122 The i386-specific hypercalls simply farm out to the right functions. */ int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args) { - struct lguest *lg = cpu->lg; - switch (args->arg0) { case LHCALL_LOAD_GDT: - load_guest_gdt(lg, args->arg1, args->arg2); + load_guest_gdt(cpu, args->arg1, args->arg2); break; case LHCALL_LOAD_IDT_ENTRY: - load_guest_idt_entry(lg, args->arg1, args->arg2, args->arg3); + load_guest_idt_entry(cpu, args->arg1, args->arg2, args->arg3); break; case LHCALL_LOAD_TLS: - guest_load_tls(lg, args->arg1); + guest_load_tls(cpu, args->arg1); break; default: /* Bad Guest. Bad! */ @@ -586,5 +584,5 @@ void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start) /* There are a couple of GDT entries the Guest expects when first * booting. */ - setup_guest_gdt(cpu->lg); + setup_guest_gdt(cpu); } diff --git a/include/asm-x86/lguest.h b/include/asm-x86/lguest.h index ccd338460811..b9d003b8005e 100644 --- a/include/asm-x86/lguest.h +++ b/include/asm-x86/lguest.h @@ -56,7 +56,7 @@ struct lguest_ro_state struct desc_struct guest_gdt[GDT_ENTRIES]; }; -struct lguest_arch +struct lg_cpu_arch { /* The GDT entries copied into lguest_ro_state when running. */ struct desc_struct gdt[GDT_ENTRIES]; -- cgit v1.2.3-59-g8ed1b From 66686c2ab08feb721ca4d98285fba64acdf6017f Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:34 -0200 Subject: lguest: per-vcpu lguest task management lguest uses tasks to control its running behaviour (like sending breaks, controlling halted state, etc). In a per-vcpu environment, each vcpu will have its own underlying task. So this patch makes the infrastructure for that possible Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/core.c | 4 +-- drivers/lguest/hypercalls.c | 2 +- drivers/lguest/interrupts_and_traps.c | 8 +++--- drivers/lguest/lg.h | 14 ++++----- drivers/lguest/lguest_user.c | 53 ++++++++++++++++++----------------- 5 files changed, 42 insertions(+), 39 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index d8e1ac305dc6..66c3d3b17fe4 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -197,7 +197,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) return -ERESTARTSYS; /* If Waker set break_out, return to Launcher. */ - if (lg->break_out) + if (cpu->break_out) return -EAGAIN; /* Check if there are any interrupts which can be delivered @@ -217,7 +217,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) /* If the Guest asked to be stopped, we sleep. The Guest's * clock timer or LHCALL_BREAK from the Waker will wake us. */ - if (lg->halted) { + if (cpu->halted) { set_current_state(TASK_INTERRUPTIBLE); schedule(); continue; diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 6f8c70ae380d..83323b1cc0b2 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -88,7 +88,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) break; case LHCALL_HALT: /* Similarly, this sets the halted flag for run_guest(). */ - lg->halted = 1; + cpu->halted = 1; break; case LHCALL_NOTIFY: lg->pending_notify = args->arg1; diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 306b93c71dcc..9c1c479e8c62 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -161,11 +161,11 @@ void maybe_do_interrupt(struct lg_cpu *cpu) return; /* If they're halted, interrupts restart them. */ - if (lg->halted) { + if (cpu->halted) { /* Re-enable interrupts. */ if (put_user(X86_EFLAGS_IF, &lg->lguest_data->irq_enabled)) kill_guest(lg, "Re-enabling interrupts"); - lg->halted = 0; + cpu->halted = 0; } else { /* Otherwise we check if they have interrupts disabled. */ u32 irq_enabled; @@ -497,8 +497,8 @@ static enum hrtimer_restart clockdev_fn(struct hrtimer *timer) /* Remember the first interrupt is the timer interrupt. */ set_bit(0, cpu->irqs_pending); /* If the Guest is actually stopped, we need to wake it up. */ - if (cpu->lg->halted) - wake_up_process(cpu->lg->tsk); + if (cpu->halted) + wake_up_process(cpu->tsk); return HRTIMER_NORESTART; } diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index d08b85342b92..e7123fa6127f 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -43,6 +43,8 @@ struct lguest; struct lg_cpu { unsigned int id; struct lguest *lg; + struct task_struct *tsk; + struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ /* At end of a page shared mapped over lguest_pages in guest. */ unsigned long regs_page; @@ -55,6 +57,11 @@ struct lg_cpu { /* Virtual clock device */ struct hrtimer hrt; + /* Do we need to stop what we're doing and return to userspace? */ + int break_out; + wait_queue_head_t break_wq; + int halted; + /* Pending virtual interrupts */ DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); @@ -65,8 +72,6 @@ struct lg_cpu { struct lguest { struct lguest_data __user *lguest_data; - struct task_struct *tsk; - struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ struct lg_cpu cpus[NR_CPUS]; unsigned int nr_cpus; @@ -76,15 +81,10 @@ struct lguest void __user *mem_base; unsigned long kernel_address; u32 cr2; - int halted; int ts; u32 esp1; u8 ss1; - /* Do we need to stop what we're doing and return to userspace? */ - int break_out; - wait_queue_head_t break_wq; - /* Bitmap of what has changed: see CHANGED_* above. */ int changed; struct lguest_pages *last_pages; diff --git a/drivers/lguest/lguest_user.c b/drivers/lguest/lguest_user.c index d21d95b2b1fc..980b3550db7f 100644 --- a/drivers/lguest/lguest_user.c +++ b/drivers/lguest/lguest_user.c @@ -13,7 +13,7 @@ * LHREQ_BREAK and the value "1" to /dev/lguest to do this. Once the Launcher * has done whatever needs attention, it writes LHREQ_BREAK and "0" to release * the Waker. */ -static int break_guest_out(struct lguest *lg, const unsigned long __user *input) +static int break_guest_out(struct lg_cpu *cpu, const unsigned long __user*input) { unsigned long on; @@ -22,14 +22,14 @@ static int break_guest_out(struct lguest *lg, const unsigned long __user *input) return -EFAULT; if (on) { - lg->break_out = 1; + cpu->break_out = 1; /* Pop it out of the Guest (may be running on different CPU) */ - wake_up_process(lg->tsk); + wake_up_process(cpu->tsk); /* Wait for them to reset it */ - return wait_event_interruptible(lg->break_wq, !lg->break_out); + return wait_event_interruptible(cpu->break_wq, !cpu->break_out); } else { - lg->break_out = 0; - wake_up(&lg->break_wq); + cpu->break_out = 0; + wake_up(&cpu->break_wq); return 0; } } @@ -69,7 +69,7 @@ static ssize_t read(struct file *file, char __user *user, size_t size,loff_t*o) cpu = &lg->cpus[cpu_id]; /* If you're not the task which owns the Guest, go away. */ - if (current != lg->tsk) + if (current != cpu->tsk) return -EPERM; /* If the guest is already dead, we indicate why */ @@ -119,6 +119,18 @@ static int lg_cpu_start(struct lg_cpu *cpu, unsigned id, unsigned long start_ip) * address. */ lguest_arch_setup_regs(cpu, start_ip); + /* Initialize the queue for the waker to wait on */ + init_waitqueue_head(&cpu->break_wq); + + /* We keep a pointer to the Launcher task (ie. current task) for when + * other Guests want to wake this one (inter-Guest I/O). */ + cpu->tsk = current; + + /* We need to keep a pointer to the Launcher's memory map, because if + * the Launcher dies we need to clean it up. If we don't keep a + * reference, it is destroyed before close() is called. */ + cpu->mm = get_task_mm(cpu->tsk); + return 0; } @@ -180,17 +192,6 @@ static int initialize(struct file *file, const unsigned long __user *input) if (err) goto free_regs; - /* We keep a pointer to the Launcher task (ie. current task) for when - * other Guests want to wake this one (inter-Guest I/O). */ - lg->tsk = current; - /* We need to keep a pointer to the Launcher's memory map, because if - * the Launcher dies we need to clean it up. If we don't keep a - * reference, it is destroyed before close() is called. */ - lg->mm = get_task_mm(lg->tsk); - - /* Initialize the queue for the waker to wait on */ - init_waitqueue_head(&lg->break_wq); - /* We remember which CPU's pages this Guest used last, for optimization * when the same Guest runs on the same CPU twice. */ lg->last_pages = NULL; @@ -246,7 +247,7 @@ static ssize_t write(struct file *file, const char __user *in, return -ENOENT; /* If you're not the task which owns the Guest, you can only break */ - if (lg && current != lg->tsk && req != LHREQ_BREAK) + if (lg && current != cpu->tsk && req != LHREQ_BREAK) return -EPERM; switch (req) { @@ -255,7 +256,7 @@ static ssize_t write(struct file *file, const char __user *in, case LHREQ_IRQ: return user_send_irq(cpu, input); case LHREQ_BREAK: - return break_guest_out(lg, input); + return break_guest_out(cpu, input); default: return -EINVAL; } @@ -280,17 +281,19 @@ static int close(struct inode *inode, struct file *file) /* We need the big lock, to protect from inter-guest I/O and other * Launchers initializing guests. */ mutex_lock(&lguest_lock); + + /* Free up the shadow page tables for the Guest. */ + free_guest_pagetable(lg); + for (i = 0; i < lg->nr_cpus; i++) { /* Cancels the hrtimer set via LHCALL_SET_CLOCKEVENT. */ hrtimer_cancel(&lg->cpus[i].hrt); /* We can free up the register page we allocated. */ free_page(lg->cpus[i].regs_page); + /* Now all the memory cleanups are done, it's safe to release + * the Launcher's memory management structure. */ + mmput(lg->cpus[i].mm); } - /* Free up the shadow page tables for the Guest. */ - free_guest_pagetable(lg); - /* Now all the memory cleanups are done, it's safe to release the - * Launcher's memory management structure. */ - mmput(lg->mm); /* If lg->dead doesn't contain an error code it will be NULL or a * kmalloc()ed string, either of which is ok to hand to kfree(). */ if (!IS_ERR(lg->dead)) -- cgit v1.2.3-59-g8ed1b From 4665ac8e28c30c2a015c617c55783c0bf3a49c05 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:35 -0200 Subject: lguest: makes special fields be per-vcpu lguest struct have room for some fields, namely, cr2, ts, esp1 and ss1, that are not really guest-wide, but rather, vcpu-wide. This patch puts it in the vcpu struct Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/hypercalls.c | 10 +++++----- drivers/lguest/interrupts_and_traps.c | 23 ++++++++++++----------- drivers/lguest/lg.h | 17 +++++++++-------- drivers/lguest/page_tables.c | 11 ++++++----- drivers/lguest/x86/core.c | 10 ++++------ 5 files changed, 36 insertions(+), 35 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 83323b1cc0b2..ab70bbebdf25 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -60,7 +60,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) /* FLUSH_TLB comes in two flavors, depending on the * argument: */ if (args->arg1) - guest_pagetable_clear_all(lg); + guest_pagetable_clear_all(cpu); else guest_pagetable_flush_user(lg); break; @@ -68,10 +68,10 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) /* All these calls simply pass the arguments through to the right * routines. */ case LHCALL_NEW_PGTABLE: - guest_new_pagetable(lg, args->arg1); + guest_new_pagetable(cpu, args->arg1); break; case LHCALL_SET_STACK: - guest_set_stack(lg, args->arg1, args->arg2, args->arg3); + guest_set_stack(cpu, args->arg1, args->arg2, args->arg3); break; case LHCALL_SET_PTE: guest_set_pte(lg, args->arg1, args->arg2, __pte(args->arg3)); @@ -84,7 +84,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) break; case LHCALL_TS: /* This sets the TS flag, as we saw used in run_guest(). */ - lg->ts = args->arg1; + cpu->ts = args->arg1; break; case LHCALL_HALT: /* Similarly, this sets the halted flag for run_guest(). */ @@ -191,7 +191,7 @@ static void initialize(struct lg_cpu *cpu) * first write to a Guest page. This may have caused a copy-on-write * fault, but the old page might be (read-only) in the Guest * pagetable. */ - guest_pagetable_clear_all(lg); + guest_pagetable_clear_all(cpu); } /*H:100 diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 9c1c479e8c62..b87d9d6c36a4 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -73,8 +73,8 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) if ((cpu->regs->ss&0x3) != GUEST_PL) { /* The Guest told us their kernel stack with the SET_STACK * hypercall: both the virtual address and the segment */ - virtstack = lg->esp1; - ss = lg->ss1; + virtstack = cpu->esp1; + ss = cpu->ss1; origstack = gstack = guest_pa(lg, virtstack); /* We push the old stack segment and pointer onto the new @@ -311,10 +311,11 @@ static int direct_trap(unsigned int num) * the Guest. * * Which is deeply unfair, because (literally!) it wasn't the Guests' fault. */ -void pin_stack_pages(struct lguest *lg) +void pin_stack_pages(struct lg_cpu *cpu) { unsigned int i; + struct lguest *lg = cpu->lg; /* Depending on the CONFIG_4KSTACKS option, the Guest can have one or * two pages of stack space. */ for (i = 0; i < lg->stack_pages; i++) @@ -322,7 +323,7 @@ void pin_stack_pages(struct lguest *lg) * start of the page after the kernel stack. Subtract one to * get back onto the first stack page, and keep subtracting to * get to the rest of the stack pages. */ - pin_page(lg, lg->esp1 - 1 - i * PAGE_SIZE); + pin_page(lg, cpu->esp1 - 1 - i * PAGE_SIZE); } /* Direct traps also mean that we need to know whenever the Guest wants to use @@ -333,21 +334,21 @@ void pin_stack_pages(struct lguest *lg) * * In Linux each process has its own kernel stack, so this happens a lot: we * change stacks on each context switch. */ -void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages) +void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages) { /* You are not allowed have a stack segment with privilege level 0: bad * Guest! */ if ((seg & 0x3) != GUEST_PL) - kill_guest(lg, "bad stack segment %i", seg); + kill_guest(cpu->lg, "bad stack segment %i", seg); /* We only expect one or two stack pages. */ if (pages > 2) - kill_guest(lg, "bad stack pages %u", pages); + kill_guest(cpu->lg, "bad stack pages %u", pages); /* Save where the stack is, and how many pages */ - lg->ss1 = seg; - lg->esp1 = esp; - lg->stack_pages = pages; + cpu->ss1 = seg; + cpu->esp1 = esp; + cpu->lg->stack_pages = pages; /* Make sure the new stack pages are mapped */ - pin_stack_pages(lg); + pin_stack_pages(cpu); } /* All this reference to mapping stacks leads us neatly into the other complex diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index e7123fa6127f..05637648a174 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -46,6 +46,11 @@ struct lg_cpu { struct task_struct *tsk; struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ + u32 cr2; + int ts; + u32 esp1; + u8 ss1; + /* At end of a page shared mapped over lguest_pages in guest. */ unsigned long regs_page; struct lguest_regs *regs; @@ -80,10 +85,6 @@ struct lguest * memory in the Launcher. */ void __user *mem_base; unsigned long kernel_address; - u32 cr2; - int ts; - u32 esp1; - u8 ss1; /* Bitmap of what has changed: see CHANGED_* above. */ int changed; @@ -141,8 +142,8 @@ void maybe_do_interrupt(struct lg_cpu *cpu); int deliver_trap(struct lg_cpu *cpu, unsigned int num); void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i, u32 low, u32 hi); -void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages); -void pin_stack_pages(struct lguest *lg); +void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages); +void pin_stack_pages(struct lg_cpu *cpu); void setup_default_idt_entries(struct lguest_ro_state *state, const unsigned long *def); void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt, @@ -164,9 +165,9 @@ void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt); /* page_tables.c: */ int init_guest_pagetable(struct lguest *lg, unsigned long pgtable); void free_guest_pagetable(struct lguest *lg); -void guest_new_pagetable(struct lguest *lg, unsigned long pgtable); +void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable); void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i); -void guest_pagetable_clear_all(struct lguest *lg); +void guest_pagetable_clear_all(struct lg_cpu *cpu); void guest_pagetable_flush_user(struct lguest *lg); void guest_set_pte(struct lguest *lg, unsigned long gpgdir, unsigned long vaddr, pte_t val); diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index f19add469944..e34c81636a8c 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -432,9 +432,10 @@ static unsigned int new_pgdir(struct lguest *lg, * Now we've seen all the page table setting and manipulation, let's see what * what happens when the Guest changes page tables (ie. changes the top-level * pgdir). This occurs on almost every context switch. */ -void guest_new_pagetable(struct lguest *lg, unsigned long pgtable) +void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable) { int newpgdir, repin = 0; + struct lguest *lg = cpu->lg; /* Look to see if we have this one already. */ newpgdir = find_pgdir(lg, pgtable); @@ -446,7 +447,7 @@ void guest_new_pagetable(struct lguest *lg, unsigned long pgtable) lg->pgdidx = newpgdir; /* If it was completely blank, we map in the Guest kernel stack */ if (repin) - pin_stack_pages(lg); + pin_stack_pages(cpu); } /*H:470 Finally, a routine which throws away everything: all PGD entries in all @@ -468,11 +469,11 @@ static void release_all_pagetables(struct lguest *lg) * mapping. Since kernel mappings are in every page table, it's easiest to * throw them all away. This traps the Guest in amber for a while as * everything faults back in, but it's rare. */ -void guest_pagetable_clear_all(struct lguest *lg) +void guest_pagetable_clear_all(struct lg_cpu *cpu) { - release_all_pagetables(lg); + release_all_pagetables(cpu->lg); /* We need the Guest kernel stack mapped again. */ - pin_stack_pages(lg); + pin_stack_pages(cpu); } /*:*/ /*M:009 Since we throw away all mappings when a kernel mapping changes, our diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index e989b8358864..65f2e3809475 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -95,8 +95,8 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) /* Set up the two "TSS" members which tell the CPU what stack to use * for traps which do directly into the Guest (ie. traps at privilege * level 1). */ - pages->state.guest_tss.esp1 = lg->esp1; - pages->state.guest_tss.ss1 = lg->ss1; + pages->state.guest_tss.esp1 = cpu->esp1; + pages->state.guest_tss.ss1 = cpu->ss1; /* Copy direct-to-Guest trap entries. */ if (lg->changed & CHANGED_IDT) @@ -165,12 +165,10 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages) * are disabled: we own the CPU. */ void lguest_arch_run_guest(struct lg_cpu *cpu) { - struct lguest *lg = cpu->lg; - /* Remember the awfully-named TS bit? If the Guest has asked to set it * we set it now, so we can trap and pass that trap to the Guest if it * uses the FPU. */ - if (lg->ts) + if (cpu->ts) lguest_set_ts(); /* SYSENTER is an optimized way of doing system calls. We can't allow @@ -325,7 +323,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) /* If the Guest doesn't want to know, we already restored the * Floating Point Unit, so we just continue without telling * it. */ - if (!lg->ts) + if (!cpu->ts) return; break; case 32 ... 255: -- cgit v1.2.3-59-g8ed1b From 1713608f280002d9ffc6de89d7de5cf367072d63 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Mon, 7 Jan 2008 11:05:37 -0200 Subject: lguest: per-vcpu lguest pgdir management this patch makes the pgdir management per-vcpu. The pgdirs pool is still guest-wide (although it'll probably need to grow when we are really executing more vcpus), but the pgdidx index is gone, since it makes no sense anymore. Instead, we use a per-vcpu index. Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/hypercalls.c | 2 +- drivers/lguest/interrupts_and_traps.c | 6 ++-- drivers/lguest/lg.h | 12 +++---- drivers/lguest/page_tables.c | 59 ++++++++++++++++++----------------- drivers/lguest/x86/core.c | 7 +++-- 5 files changed, 44 insertions(+), 42 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index be8f04685767..0471018d700d 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -62,7 +62,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) if (args->arg1) guest_pagetable_clear_all(cpu); else - guest_pagetable_flush_user(lg); + guest_pagetable_flush_user(cpu); break; /* All these calls simply pass the arguments through to the right diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index b87d9d6c36a4..6bbfce4e5987 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -76,7 +76,7 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) virtstack = cpu->esp1; ss = cpu->ss1; - origstack = gstack = guest_pa(lg, virtstack); + origstack = gstack = guest_pa(cpu, virtstack); /* We push the old stack segment and pointer onto the new * stack: when the Guest does an "iret" back from the interrupt * handler the CPU will notice they're dropping privilege @@ -88,7 +88,7 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) virtstack = cpu->regs->esp; ss = cpu->regs->ss; - origstack = gstack = guest_pa(lg, virtstack); + origstack = gstack = guest_pa(cpu, virtstack); } /* Remember that we never let the Guest actually disable interrupts, so @@ -323,7 +323,7 @@ void pin_stack_pages(struct lg_cpu *cpu) * start of the page after the kernel stack. Subtract one to * get back onto the first stack page, and keep subtracting to * get to the rest of the stack pages. */ - pin_page(lg, cpu->esp1 - 1 - i * PAGE_SIZE); + pin_page(cpu, cpu->esp1 - 1 - i * PAGE_SIZE); } /* Direct traps also mean that we need to know whenever the Guest wants to use diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 95b473cdd0e0..94e518da9aa8 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -57,6 +57,8 @@ struct lg_cpu { unsigned long regs_page; struct lguest_regs *regs; + int cpu_pgd; /* which pgd this cpu is currently using */ + /* If a hypercall was asked for, this points to the arguments. */ struct hcall_args *hcall; u32 next_hcall; @@ -92,8 +94,6 @@ struct lguest int changed; struct lguest_pages *last_pages; - /* We keep a small number of these. */ - u32 pgdidx; struct pgdir pgdirs[4]; unsigned long noirq_start, noirq_end; @@ -169,13 +169,13 @@ void free_guest_pagetable(struct lguest *lg); void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable); void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i); void guest_pagetable_clear_all(struct lg_cpu *cpu); -void guest_pagetable_flush_user(struct lguest *lg); +void guest_pagetable_flush_user(struct lg_cpu *cpu); void guest_set_pte(struct lguest *lg, unsigned long gpgdir, unsigned long vaddr, pte_t val); void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages); -int demand_page(struct lguest *info, unsigned long cr2, int errcode); -void pin_page(struct lguest *lg, unsigned long vaddr); -unsigned long guest_pa(struct lguest *lg, unsigned long vaddr); +int demand_page(struct lg_cpu *cpu, unsigned long cr2, int errcode); +void pin_page(struct lg_cpu *cpu, unsigned long vaddr); +unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr); void page_table_guest_data_init(struct lguest *lg); /* /core.c: */ diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index e34c81636a8c..fb665611ccc2 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -94,10 +94,10 @@ static pte_t *spte_addr(struct lguest *lg, pgd_t spgd, unsigned long vaddr) /* These two functions just like the above two, except they access the Guest * page tables. Hence they return a Guest address. */ -static unsigned long gpgd_addr(struct lguest *lg, unsigned long vaddr) +static unsigned long gpgd_addr(struct lg_cpu *cpu, unsigned long vaddr) { unsigned int index = vaddr >> (PGDIR_SHIFT); - return lg->pgdirs[lg->pgdidx].gpgdir + index * sizeof(pgd_t); + return cpu->lg->pgdirs[cpu->cpu_pgd].gpgdir + index * sizeof(pgd_t); } static unsigned long gpte_addr(struct lguest *lg, @@ -200,22 +200,23 @@ static void check_gpgd(struct lguest *lg, pgd_t gpgd) * * If we fixed up the fault (ie. we mapped the address), this routine returns * true. Otherwise, it was a real fault and we need to tell the Guest. */ -int demand_page(struct lguest *lg, unsigned long vaddr, int errcode) +int demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode) { pgd_t gpgd; pgd_t *spgd; unsigned long gpte_ptr; pte_t gpte; pte_t *spte; + struct lguest *lg = cpu->lg; /* First step: get the top-level Guest page table entry. */ - gpgd = lgread(lg, gpgd_addr(lg, vaddr), pgd_t); + gpgd = lgread(lg, gpgd_addr(cpu, vaddr), pgd_t); /* Toplevel not present? We can't map it in. */ if (!(pgd_flags(gpgd) & _PAGE_PRESENT)) return 0; /* Now look at the matching shadow entry. */ - spgd = spgd_addr(lg, lg->pgdidx, vaddr); + spgd = spgd_addr(lg, cpu->cpu_pgd, vaddr); if (!(pgd_flags(*spgd) & _PAGE_PRESENT)) { /* No shadow entry: allocate a new shadow PTE page. */ unsigned long ptepage = get_zeroed_page(GFP_KERNEL); @@ -297,19 +298,19 @@ int demand_page(struct lguest *lg, unsigned long vaddr, int errcode) * * This is a quick version which answers the question: is this virtual address * mapped by the shadow page tables, and is it writable? */ -static int page_writable(struct lguest *lg, unsigned long vaddr) +static int page_writable(struct lg_cpu *cpu, unsigned long vaddr) { pgd_t *spgd; unsigned long flags; /* Look at the current top level entry: is it present? */ - spgd = spgd_addr(lg, lg->pgdidx, vaddr); + spgd = spgd_addr(cpu->lg, cpu->cpu_pgd, vaddr); if (!(pgd_flags(*spgd) & _PAGE_PRESENT)) return 0; /* Check the flags on the pte entry itself: it must be present and * writable. */ - flags = pte_flags(*(spte_addr(lg, *spgd, vaddr))); + flags = pte_flags(*(spte_addr(cpu->lg, *spgd, vaddr))); return (flags & (_PAGE_PRESENT|_PAGE_RW)) == (_PAGE_PRESENT|_PAGE_RW); } @@ -317,10 +318,10 @@ static int page_writable(struct lguest *lg, unsigned long vaddr) /* So, when pin_stack_pages() asks us to pin a page, we check if it's already * in the page tables, and if not, we call demand_page() with error code 2 * (meaning "write"). */ -void pin_page(struct lguest *lg, unsigned long vaddr) +void pin_page(struct lg_cpu *cpu, unsigned long vaddr) { - if (!page_writable(lg, vaddr) && !demand_page(lg, vaddr, 2)) - kill_guest(lg, "bad stack page %#lx", vaddr); + if (!page_writable(cpu, vaddr) && !demand_page(cpu, vaddr, 2)) + kill_guest(cpu->lg, "bad stack page %#lx", vaddr); } /*H:450 If we chase down the release_pgd() code, it looks like this: */ @@ -358,28 +359,28 @@ static void flush_user_mappings(struct lguest *lg, int idx) * * The Guest has a hypercall to throw away the page tables: it's used when a * large number of mappings have been changed. */ -void guest_pagetable_flush_user(struct lguest *lg) +void guest_pagetable_flush_user(struct lg_cpu *cpu) { /* Drop the userspace part of the current page table. */ - flush_user_mappings(lg, lg->pgdidx); + flush_user_mappings(cpu->lg, cpu->cpu_pgd); } /*:*/ /* We walk down the guest page tables to get a guest-physical address */ -unsigned long guest_pa(struct lguest *lg, unsigned long vaddr) +unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr) { pgd_t gpgd; pte_t gpte; /* First step: get the top-level Guest page table entry. */ - gpgd = lgread(lg, gpgd_addr(lg, vaddr), pgd_t); + gpgd = lgread(cpu->lg, gpgd_addr(cpu, vaddr), pgd_t); /* Toplevel not present? We can't map it in. */ if (!(pgd_flags(gpgd) & _PAGE_PRESENT)) - kill_guest(lg, "Bad address %#lx", vaddr); + kill_guest(cpu->lg, "Bad address %#lx", vaddr); - gpte = lgread(lg, gpte_addr(lg, gpgd, vaddr), pte_t); + gpte = lgread(cpu->lg, gpte_addr(cpu->lg, gpgd, vaddr), pte_t); if (!(pte_flags(gpte) & _PAGE_PRESENT)) - kill_guest(lg, "Bad address %#lx", vaddr); + kill_guest(cpu->lg, "Bad address %#lx", vaddr); return pte_pfn(gpte) * PAGE_SIZE | (vaddr & ~PAGE_MASK); } @@ -399,11 +400,12 @@ static unsigned int find_pgdir(struct lguest *lg, unsigned long pgtable) /*H:435 And this is us, creating the new page directory. If we really do * allocate a new one (and so the kernel parts are not there), we set * blank_pgdir. */ -static unsigned int new_pgdir(struct lguest *lg, +static unsigned int new_pgdir(struct lg_cpu *cpu, unsigned long gpgdir, int *blank_pgdir) { unsigned int next; + struct lguest *lg = cpu->lg; /* We pick one entry at random to throw out. Choosing the Least * Recently Used might be better, but this is easy. */ @@ -413,7 +415,7 @@ static unsigned int new_pgdir(struct lguest *lg, lg->pgdirs[next].pgdir = (pgd_t *)get_zeroed_page(GFP_KERNEL); /* If the allocation fails, just keep using the one we have */ if (!lg->pgdirs[next].pgdir) - next = lg->pgdidx; + next = cpu->cpu_pgd; else /* This is a blank page, so there are no kernel * mappings: caller must map the stack! */ @@ -442,9 +444,9 @@ void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable) /* If not, we allocate or mug an existing one: if it's a fresh one, * repin gets set to 1. */ if (newpgdir == ARRAY_SIZE(lg->pgdirs)) - newpgdir = new_pgdir(lg, pgtable, &repin); + newpgdir = new_pgdir(cpu, pgtable, &repin); /* Change the current pgd index to the new one. */ - lg->pgdidx = newpgdir; + cpu->cpu_pgd = newpgdir; /* If it was completely blank, we map in the Guest kernel stack */ if (repin) pin_stack_pages(cpu); @@ -591,11 +593,11 @@ int init_guest_pagetable(struct lguest *lg, unsigned long pgtable) { /* We start on the first shadow page table, and give it a blank PGD * page. */ - lg->pgdidx = 0; - lg->pgdirs[lg->pgdidx].gpgdir = pgtable; - lg->pgdirs[lg->pgdidx].pgdir = (pgd_t*)get_zeroed_page(GFP_KERNEL); - if (!lg->pgdirs[lg->pgdidx].pgdir) + lg->pgdirs[0].gpgdir = pgtable; + lg->pgdirs[0].pgdir = (pgd_t *)get_zeroed_page(GFP_KERNEL); + if (!lg->pgdirs[0].pgdir) return -ENOMEM; + lg->cpus[0].cpu_pgd = 0; return 0; } @@ -607,7 +609,7 @@ void page_table_guest_data_init(struct lguest *lg) /* We tell the Guest that it can't use the top 4MB of virtual * addresses used by the Switcher. */ || put_user(4U*1024*1024, &lg->lguest_data->reserve_mem) - || put_user(lg->pgdirs[lg->pgdidx].gpgdir,&lg->lguest_data->pgdir)) + || put_user(lg->pgdirs[0].gpgdir, &lg->lguest_data->pgdir)) kill_guest(lg, "bad guest page %p", lg->lguest_data); /* In flush_user_mappings() we loop from 0 to @@ -637,7 +639,6 @@ void free_guest_pagetable(struct lguest *lg) * Guest is about to run on this CPU. */ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages) { - struct lguest *lg = cpu->lg; pte_t *switcher_pte_page = __get_cpu_var(switcher_pte_pages); pgd_t switcher_pgd; pte_t regs_pte; @@ -647,7 +648,7 @@ void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages) * page for this CPU (with appropriate flags). */ switcher_pgd = __pgd(__pa(switcher_pte_page) | _PAGE_KERNEL); - lg->pgdirs[lg->pgdidx].pgdir[SWITCHER_PGD_INDEX] = switcher_pgd; + cpu->lg->pgdirs[cpu->cpu_pgd].pgdir[SWITCHER_PGD_INDEX] = switcher_pgd; /* We also change the Switcher PTE page. When we're running the Guest, * we want the Guest's "regs" page to appear where the first Switcher diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 65f2e3809475..8c723555ffb3 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -145,7 +145,7 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages) * 0-th argument above, ie "a"). %ebx contains the * physical address of the Guest's top-level page * directory. */ - : "0"(pages), "1"(__pa(lg->pgdirs[lg->pgdidx].pgdir)) + : "0"(pages), "1"(__pa(lg->pgdirs[cpu->cpu_pgd].pgdir)) /* We tell gcc that all these registers could change, * which means we don't have to save and restore them in * the Switcher. */ @@ -223,7 +223,7 @@ static int emulate_insn(struct lg_cpu *cpu) unsigned int insnlen = 0, in = 0, shift = 0; /* The eip contains the *virtual* address of the Guest's instruction: * guest_pa just subtracts the Guest's page_offset. */ - unsigned long physaddr = guest_pa(lg, cpu->regs->eip); + unsigned long physaddr = guest_pa(cpu, cpu->regs->eip); /* This must be the Guest kernel trying to do something, not userspace! * The bottom two bits of the CS segment register are the privilege @@ -305,7 +305,8 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) * * The errcode tells whether this was a read or a write, and * whether kernel or userspace code. */ - if (demand_page(lg,cpu->arch.last_pagefault,cpu->regs->errcode)) + if (demand_page(cpu, cpu->arch.last_pagefault, + cpu->regs->errcode)) return; /* OK, it's really not there (or not OK): the Guest needs to -- cgit v1.2.3-59-g8ed1b From ae3749dcd8c31dcfbab14ea28c68a944c93f418f Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Thu, 17 Jan 2008 19:14:46 -0200 Subject: lguest: move changed bitmap to lg_cpu events represented in the 'changed' bitmap are per-cpu, not per-guest. move it to the lg_cpu structure Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/interrupts_and_traps.c | 2 +- drivers/lguest/lg.h | 6 +++--- drivers/lguest/segments.c | 4 ++-- drivers/lguest/x86/core.c | 11 +++++------ 4 files changed, 11 insertions(+), 12 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 6bbfce4e5987..9ac7455ec7fb 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -395,7 +395,7 @@ void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int num, u32 lo, u32 hi) /* Mark the IDT as changed: next time the Guest runs we'll know we have * to copy this again. */ - cpu->lg->changed |= CHANGED_IDT; + cpu->changed |= CHANGED_IDT; /* Check that the Guest doesn't try to step outside the bounds. */ if (num >= ARRAY_SIZE(cpu->arch.idt)) diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index f1c4c33e4153..0d6f6435d72c 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -51,6 +51,9 @@ struct lg_cpu { u32 esp1; u8 ss1; + /* Bitmap of what has changed: see CHANGED_* above. */ + int changed; + unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */ /* At end of a page shared mapped over lguest_pages in guest. */ @@ -92,9 +95,6 @@ struct lguest void __user *mem_base; unsigned long kernel_address; - /* Bitmap of what has changed: see CHANGED_* above. */ - int changed; - struct pgdir pgdirs[4]; unsigned long noirq_start, noirq_end; diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c index 02138450ecf5..635f54c719ae 100644 --- a/drivers/lguest/segments.c +++ b/drivers/lguest/segments.c @@ -159,7 +159,7 @@ void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num) fixup_gdt_table(cpu, 0, ARRAY_SIZE(cpu->arch.gdt)); /* Mark that the GDT changed so the core knows it has to copy it again, * even if the Guest is run on the same CPU. */ - lg->changed |= CHANGED_GDT; + cpu->changed |= CHANGED_GDT; } /* This is the fast-track version for just changing the three TLS entries. @@ -174,7 +174,7 @@ void guest_load_tls(struct lg_cpu *cpu, unsigned long gtls) __lgread(lg, tls, gtls, sizeof(*tls)*GDT_ENTRY_TLS_ENTRIES); fixup_gdt_table(cpu, GDT_ENTRY_TLS_MIN, GDT_ENTRY_TLS_MAX+1); /* Note that just the TLS entries have changed. */ - lg->changed |= CHANGED_GDT_TLS; + cpu->changed |= CHANGED_GDT_TLS; } /*:*/ diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index f8dfdc9a3e5b..fd6a8512443c 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -75,7 +75,6 @@ static DEFINE_PER_CPU(struct lg_cpu *, last_cpu); */ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) { - struct lguest *lg = cpu->lg; /* Copying all this data can be quite expensive. We usually run the * same Guest we ran last time (and that Guest hasn't run anywhere else * meanwhile). If that's not the case, we pretend everything in the @@ -83,7 +82,7 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) if (__get_cpu_var(last_cpu) != cpu || cpu->last_pages != pages) { __get_cpu_var(last_cpu) = cpu; cpu->last_pages = pages; - lg->changed = CHANGED_ALL; + cpu->changed = CHANGED_ALL; } /* These copies are pretty cheap, so we do them unconditionally: */ @@ -99,18 +98,18 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages) pages->state.guest_tss.ss1 = cpu->ss1; /* Copy direct-to-Guest trap entries. */ - if (lg->changed & CHANGED_IDT) + if (cpu->changed & CHANGED_IDT) copy_traps(cpu, pages->state.guest_idt, default_idt_entries); /* Copy all GDT entries which the Guest can change. */ - if (lg->changed & CHANGED_GDT) + if (cpu->changed & CHANGED_GDT) copy_gdt(cpu, pages->state.guest_gdt); /* If only the TLS entries have changed, copy them. */ - else if (lg->changed & CHANGED_GDT_TLS) + else if (cpu->changed & CHANGED_GDT_TLS) copy_gdt_tls(cpu, pages->state.guest_gdt); /* Mark the Guest as unchanged for next time. */ - lg->changed = 0; + cpu->changed = 0; } /* Finally: the code to actually call into the Switcher to run the Guest. */ -- cgit v1.2.3-59-g8ed1b From 382ac6b3fbc0ea6a5697fc6caaf7e7de12fa8b96 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Thu, 17 Jan 2008 19:19:42 -0200 Subject: lguest: get rid of lg variable assignments We can save some lines of code by getting rid of *lg = cpu... lines of code spread everywhere by now. Signed-off-by: Glauber de Oliveira Costa Signed-off-by: Rusty Russell --- drivers/lguest/core.c | 24 ++++--- drivers/lguest/hypercalls.c | 49 +++++++-------- drivers/lguest/interrupts_and_traps.c | 54 ++++++++-------- drivers/lguest/lg.h | 28 ++++----- drivers/lguest/page_tables.c | 115 +++++++++++++++++----------------- drivers/lguest/segments.c | 8 +-- drivers/lguest/x86/core.c | 30 +++++---- 7 files changed, 149 insertions(+), 159 deletions(-) (limited to 'drivers/lguest/interrupts_and_traps.c') diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c index 6023872e32d0..7743d73768df 100644 --- a/drivers/lguest/core.c +++ b/drivers/lguest/core.c @@ -151,23 +151,23 @@ int lguest_address_ok(const struct lguest *lg, /* This routine copies memory from the Guest. Here we can see how useful the * kill_lguest() routine we met in the Launcher can be: we return a random * value (all zeroes) instead of needing to return an error. */ -void __lgread(struct lguest *lg, void *b, unsigned long addr, unsigned bytes) +void __lgread(struct lg_cpu *cpu, void *b, unsigned long addr, unsigned bytes) { - if (!lguest_address_ok(lg, addr, bytes) - || copy_from_user(b, lg->mem_base + addr, bytes) != 0) { + if (!lguest_address_ok(cpu->lg, addr, bytes) + || copy_from_user(b, cpu->lg->mem_base + addr, bytes) != 0) { /* copy_from_user should do this, but as we rely on it... */ memset(b, 0, bytes); - kill_guest(lg, "bad read address %#lx len %u", addr, bytes); + kill_guest(cpu, "bad read address %#lx len %u", addr, bytes); } } /* This is the write (copy into guest) version. */ -void __lgwrite(struct lguest *lg, unsigned long addr, const void *b, +void __lgwrite(struct lg_cpu *cpu, unsigned long addr, const void *b, unsigned bytes) { - if (!lguest_address_ok(lg, addr, bytes) - || copy_to_user(lg->mem_base + addr, b, bytes) != 0) - kill_guest(lg, "bad write address %#lx len %u", addr, bytes); + if (!lguest_address_ok(cpu->lg, addr, bytes) + || copy_to_user(cpu->lg->mem_base + addr, b, bytes) != 0) + kill_guest(cpu, "bad write address %#lx len %u", addr, bytes); } /*:*/ @@ -176,10 +176,8 @@ void __lgwrite(struct lguest *lg, unsigned long addr, const void *b, * going around and around until something interesting happens. */ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) { - struct lguest *lg = cpu->lg; - /* We stop running once the Guest is dead. */ - while (!lg->dead) { + while (!cpu->lg->dead) { /* First we run any hypercalls the Guest wants done. */ if (cpu->hcall) do_hypercalls(cpu); @@ -212,7 +210,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) /* Just make absolutely sure the Guest is still alive. One of * those hypercalls could have been fatal, for example. */ - if (lg->dead) + if (cpu->lg->dead) break; /* If the Guest asked to be stopped, we sleep. The Guest's @@ -237,7 +235,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user) lguest_arch_handle_trap(cpu); } - if (lg->dead == ERR_PTR(-ERESTART)) + if (cpu->lg->dead == ERR_PTR(-ERESTART)) return -ERESTART; /* The Guest is dead => "No such file or directory" */ return -ENOENT; diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c index 0471018d700d..32666d0d956a 100644 --- a/drivers/lguest/hypercalls.c +++ b/drivers/lguest/hypercalls.c @@ -31,8 +31,6 @@ * Or gets killed. Or, in the case of LHCALL_CRASH, both. */ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) { - struct lguest *lg = cpu->lg; - switch (args->arg0) { case LHCALL_FLUSH_ASYNC: /* This call does nothing, except by breaking out of the Guest @@ -41,7 +39,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) case LHCALL_LGUEST_INIT: /* You can't get here unless you're already initialized. Don't * do that. */ - kill_guest(lg, "already have lguest_data"); + kill_guest(cpu, "already have lguest_data"); break; case LHCALL_SHUTDOWN: { /* Shutdown is such a trivial hypercall that we do it in four @@ -49,11 +47,11 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) char msg[128]; /* If the lgread fails, it will call kill_guest() itself; the * kill_guest() with the message will be ignored. */ - __lgread(lg, msg, args->arg1, sizeof(msg)); + __lgread(cpu, msg, args->arg1, sizeof(msg)); msg[sizeof(msg)-1] = '\0'; - kill_guest(lg, "CRASH: %s", msg); + kill_guest(cpu, "CRASH: %s", msg); if (args->arg2 == LGUEST_SHUTDOWN_RESTART) - lg->dead = ERR_PTR(-ERESTART); + cpu->lg->dead = ERR_PTR(-ERESTART); break; } case LHCALL_FLUSH_TLB: @@ -74,10 +72,10 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) guest_set_stack(cpu, args->arg1, args->arg2, args->arg3); break; case LHCALL_SET_PTE: - guest_set_pte(lg, args->arg1, args->arg2, __pte(args->arg3)); + guest_set_pte(cpu, args->arg1, args->arg2, __pte(args->arg3)); break; case LHCALL_SET_PMD: - guest_set_pmd(lg, args->arg1, args->arg2); + guest_set_pmd(cpu->lg, args->arg1, args->arg2); break; case LHCALL_SET_CLOCKEVENT: guest_set_clockevent(cpu, args->arg1); @@ -96,7 +94,7 @@ static void do_hcall(struct lg_cpu *cpu, struct hcall_args *args) default: /* It should be an architecture-specific hypercall. */ if (lguest_arch_do_hcall(cpu, args)) - kill_guest(lg, "Bad hypercall %li\n", args->arg0); + kill_guest(cpu, "Bad hypercall %li\n", args->arg0); } } /*:*/ @@ -112,10 +110,9 @@ static void do_async_hcalls(struct lg_cpu *cpu) { unsigned int i; u8 st[LHCALL_RING_SIZE]; - struct lguest *lg = cpu->lg; /* For simplicity, we copy the entire call status array in at once. */ - if (copy_from_user(&st, &lg->lguest_data->hcall_status, sizeof(st))) + if (copy_from_user(&st, &cpu->lg->lguest_data->hcall_status, sizeof(st))) return; /* We process "struct lguest_data"s hcalls[] ring once. */ @@ -137,9 +134,9 @@ static void do_async_hcalls(struct lg_cpu *cpu) /* Copy the hypercall arguments into a local copy of * the hcall_args struct. */ - if (copy_from_user(&args, &lg->lguest_data->hcalls[n], + if (copy_from_user(&args, &cpu->lg->lguest_data->hcalls[n], sizeof(struct hcall_args))) { - kill_guest(lg, "Fetching async hypercalls"); + kill_guest(cpu, "Fetching async hypercalls"); break; } @@ -147,8 +144,8 @@ static void do_async_hcalls(struct lg_cpu *cpu) do_hcall(cpu, &args); /* Mark the hypercall done. */ - if (put_user(0xFF, &lg->lguest_data->hcall_status[n])) { - kill_guest(lg, "Writing result for async hypercall"); + if (put_user(0xFF, &cpu->lg->lguest_data->hcall_status[n])) { + kill_guest(cpu, "Writing result for async hypercall"); break; } @@ -163,29 +160,28 @@ static void do_async_hcalls(struct lg_cpu *cpu) * Guest makes a hypercall, we end up here to set things up: */ static void initialize(struct lg_cpu *cpu) { - struct lguest *lg = cpu->lg; /* You can't do anything until you're initialized. The Guest knows the * rules, so we're unforgiving here. */ if (cpu->hcall->arg0 != LHCALL_LGUEST_INIT) { - kill_guest(lg, "hypercall %li before INIT", cpu->hcall->arg0); + kill_guest(cpu, "hypercall %li before INIT", cpu->hcall->arg0); return; } if (lguest_arch_init_hypercalls(cpu)) - kill_guest(lg, "bad guest page %p", lg->lguest_data); + kill_guest(cpu, "bad guest page %p", cpu->lg->lguest_data); /* The Guest tells us where we're not to deliver interrupts by putting * the range of addresses into "struct lguest_data". */ - if (get_user(lg->noirq_start, &lg->lguest_data->noirq_start) - || get_user(lg->noirq_end, &lg->lguest_data->noirq_end)) - kill_guest(lg, "bad guest page %p", lg->lguest_data); + if (get_user(cpu->lg->noirq_start, &cpu->lg->lguest_data->noirq_start) + || get_user(cpu->lg->noirq_end, &cpu->lg->lguest_data->noirq_end)) + kill_guest(cpu, "bad guest page %p", cpu->lg->lguest_data); /* We write the current time into the Guest's data page once so it can * set its clock. */ - write_timestamp(lg); + write_timestamp(cpu); /* page_tables.c will also do some setup. */ - page_table_guest_data_init(lg); + page_table_guest_data_init(cpu); /* This is the one case where the above accesses might have been the * first write to a Guest page. This may have caused a copy-on-write @@ -237,10 +233,11 @@ void do_hypercalls(struct lg_cpu *cpu) /* This routine supplies the Guest with time: it's used for wallclock time at * initial boot and as a rough time source if the TSC isn't available. */ -void write_timestamp(struct lguest *lg) +void write_timestamp(struct lg_cpu *cpu) { struct timespec now; ktime_get_real_ts(&now); - if (copy_to_user(&lg->lguest_data->time, &now, sizeof(struct timespec))) - kill_guest(lg, "Writing timestamp"); + if (copy_to_user(&cpu->lg->lguest_data->time, + &now, sizeof(struct timespec))) + kill_guest(cpu, "Writing timestamp"); } diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index 9ac7455ec7fb..32e97c1858e5 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -41,11 +41,11 @@ static int idt_present(u32 lo, u32 hi) /* We need a helper to "push" a value onto the Guest's stack, since that's a * big part of what delivering an interrupt does. */ -static void push_guest_stack(struct lguest *lg, unsigned long *gstack, u32 val) +static void push_guest_stack(struct lg_cpu *cpu, unsigned long *gstack, u32 val) { /* Stack grows upwards: move stack then write value. */ *gstack -= 4; - lgwrite(lg, *gstack, u32, val); + lgwrite(cpu, *gstack, u32, val); } /*H:210 The set_guest_interrupt() routine actually delivers the interrupt or @@ -65,7 +65,6 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) unsigned long gstack, origstack; u32 eflags, ss, irq_enable; unsigned long virtstack; - struct lguest *lg = cpu->lg; /* There are two cases for interrupts: one where the Guest is already * in the kernel, and a more complex one where the Guest is in @@ -81,8 +80,8 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) * stack: when the Guest does an "iret" back from the interrupt * handler the CPU will notice they're dropping privilege * levels and expect these here. */ - push_guest_stack(lg, &gstack, cpu->regs->ss); - push_guest_stack(lg, &gstack, cpu->regs->esp); + push_guest_stack(cpu, &gstack, cpu->regs->ss); + push_guest_stack(cpu, &gstack, cpu->regs->esp); } else { /* We're staying on the same Guest (kernel) stack. */ virtstack = cpu->regs->esp; @@ -96,20 +95,20 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) * Guest's "irq_enabled" field into the eflags word: we saw the Guest * copy it back in "lguest_iret". */ eflags = cpu->regs->eflags; - if (get_user(irq_enable, &lg->lguest_data->irq_enabled) == 0 + if (get_user(irq_enable, &cpu->lg->lguest_data->irq_enabled) == 0 && !(irq_enable & X86_EFLAGS_IF)) eflags &= ~X86_EFLAGS_IF; /* An interrupt is expected to push three things on the stack: the old * "eflags" word, the old code segment, and the old instruction * pointer. */ - push_guest_stack(lg, &gstack, eflags); - push_guest_stack(lg, &gstack, cpu->regs->cs); - push_guest_stack(lg, &gstack, cpu->regs->eip); + push_guest_stack(cpu, &gstack, eflags); + push_guest_stack(cpu, &gstack, cpu->regs->cs); + push_guest_stack(cpu, &gstack, cpu->regs->eip); /* For the six traps which supply an error code, we push that, too. */ if (has_err) - push_guest_stack(lg, &gstack, cpu->regs->errcode); + push_guest_stack(cpu, &gstack, cpu->regs->errcode); /* Now we've pushed all the old state, we change the stack, the code * segment and the address to execute. */ @@ -121,8 +120,8 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) /* There are two kinds of interrupt handlers: 0xE is an "interrupt * gate" which expects interrupts to be disabled on entry. */ if (idt_type(lo, hi) == 0xE) - if (put_user(0, &lg->lguest_data->irq_enabled)) - kill_guest(lg, "Disabling interrupts"); + if (put_user(0, &cpu->lg->lguest_data->irq_enabled)) + kill_guest(cpu, "Disabling interrupts"); } /*H:205 @@ -133,17 +132,16 @@ static void set_guest_interrupt(struct lg_cpu *cpu, u32 lo, u32 hi, int has_err) void maybe_do_interrupt(struct lg_cpu *cpu) { unsigned int irq; - struct lguest *lg = cpu->lg; DECLARE_BITMAP(blk, LGUEST_IRQS); struct desc_struct *idt; /* If the Guest hasn't even initialized yet, we can do nothing. */ - if (!lg->lguest_data) + if (!cpu->lg->lguest_data) return; /* Take our "irqs_pending" array and remove any interrupts the Guest * wants blocked: the result ends up in "blk". */ - if (copy_from_user(&blk, lg->lguest_data->blocked_interrupts, + if (copy_from_user(&blk, cpu->lg->lguest_data->blocked_interrupts, sizeof(blk))) return; @@ -157,19 +155,20 @@ void maybe_do_interrupt(struct lg_cpu *cpu) /* They may be in the middle of an iret, where they asked us never to * deliver interrupts. */ - if (cpu->regs->eip >= lg->noirq_start && cpu->regs->eip < lg->noirq_end) + if (cpu->regs->eip >= cpu->lg->noirq_start && + (cpu->regs->eip < cpu->lg->noirq_end)) return; /* If they're halted, interrupts restart them. */ if (cpu->halted) { /* Re-enable interrupts. */ - if (put_user(X86_EFLAGS_IF, &lg->lguest_data->irq_enabled)) - kill_guest(lg, "Re-enabling interrupts"); + if (put_user(X86_EFLAGS_IF, &cpu->lg->lguest_data->irq_enabled)) + kill_guest(cpu, "Re-enabling interrupts"); cpu->halted = 0; } else { /* Otherwise we check if they have interrupts disabled. */ u32 irq_enabled; - if (get_user(irq_enabled, &lg->lguest_data->irq_enabled)) + if (get_user(irq_enabled, &cpu->lg->lguest_data->irq_enabled)) irq_enabled = 0; if (!irq_enabled) return; @@ -194,7 +193,7 @@ void maybe_do_interrupt(struct lg_cpu *cpu) * did this more often, but it can actually be quite slow: doing it * here is a compromise which means at least it gets updated every * timer interrupt. */ - write_timestamp(lg); + write_timestamp(cpu); } /*:*/ @@ -315,10 +314,9 @@ void pin_stack_pages(struct lg_cpu *cpu) { unsigned int i; - struct lguest *lg = cpu->lg; /* Depending on the CONFIG_4KSTACKS option, the Guest can have one or * two pages of stack space. */ - for (i = 0; i < lg->stack_pages; i++) + for (i = 0; i < cpu->lg->stack_pages; i++) /* The stack grows *upwards*, so the address we're given is the * start of the page after the kernel stack. Subtract one to * get back onto the first stack page, and keep subtracting to @@ -339,10 +337,10 @@ void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages) /* You are not allowed have a stack segment with privilege level 0: bad * Guest! */ if ((seg & 0x3) != GUEST_PL) - kill_guest(cpu->lg, "bad stack segment %i", seg); + kill_guest(cpu, "bad stack segment %i", seg); /* We only expect one or two stack pages. */ if (pages > 2) - kill_guest(cpu->lg, "bad stack pages %u", pages); + kill_guest(cpu, "bad stack pages %u", pages); /* Save where the stack is, and how many pages */ cpu->ss1 = seg; cpu->esp1 = esp; @@ -356,7 +354,7 @@ void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages) /*H:235 This is the routine which actually checks the Guest's IDT entry and * transfers it into the entry in "struct lguest": */ -static void set_trap(struct lguest *lg, struct desc_struct *trap, +static void set_trap(struct lg_cpu *cpu, struct desc_struct *trap, unsigned int num, u32 lo, u32 hi) { u8 type = idt_type(lo, hi); @@ -369,7 +367,7 @@ static void set_trap(struct lguest *lg, struct desc_struct *trap, /* We only support interrupt and trap gates. */ if (type != 0xE && type != 0xF) - kill_guest(lg, "bad IDT type %i", type); + kill_guest(cpu, "bad IDT type %i", type); /* We only copy the handler address, present bit, privilege level and * type. The privilege level controls where the trap can be triggered @@ -399,9 +397,9 @@ void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int num, u32 lo, u32 hi) /* Check that the Guest doesn't try to step outside the bounds. */ if (num >= ARRAY_SIZE(cpu->arch.idt)) - kill_guest(cpu->lg, "Setting idt entry %u", num); + kill_guest(cpu, "Setting idt entry %u", num); else - set_trap(cpu->lg, &cpu->arch.idt[num], num, lo, hi); + set_trap(cpu, &cpu->arch.idt[num], num, lo, hi); } /* The default entry for each interrupt points into the Switcher routines which diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index 0d6f6435d72c..b75ce3b17afe 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -111,22 +111,22 @@ extern struct mutex lguest_lock; /* core.c: */ int lguest_address_ok(const struct lguest *lg, unsigned long addr, unsigned long len); -void __lgread(struct lguest *, void *, unsigned long, unsigned); -void __lgwrite(struct lguest *, unsigned long, const void *, unsigned); +void __lgread(struct lg_cpu *, void *, unsigned long, unsigned); +void __lgwrite(struct lg_cpu *, unsigned long, const void *, unsigned); /*H:035 Using memory-copy operations like that is usually inconvient, so we * have the following helper macros which read and write a specific type (often * an unsigned long). * * This reads into a variable of the given type then returns that. */ -#define lgread(lg, addr, type) \ - ({ type _v; __lgread((lg), &_v, (addr), sizeof(_v)); _v; }) +#define lgread(cpu, addr, type) \ + ({ type _v; __lgread((cpu), &_v, (addr), sizeof(_v)); _v; }) /* This checks that the variable is of the given type, then writes it out. */ -#define lgwrite(lg, addr, type, val) \ +#define lgwrite(cpu, addr, type, val) \ do { \ typecheck(type, val); \ - __lgwrite((lg), (addr), &(val), sizeof(val)); \ + __lgwrite((cpu), (addr), &(val), sizeof(val)); \ } while(0) /* (end of memory access helper routines) :*/ @@ -171,13 +171,13 @@ void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable); void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i); void guest_pagetable_clear_all(struct lg_cpu *cpu); void guest_pagetable_flush_user(struct lg_cpu *cpu); -void guest_set_pte(struct lguest *lg, unsigned long gpgdir, +void guest_set_pte(struct lg_cpu *cpu, unsigned long gpgdir, unsigned long vaddr, pte_t val); void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages); int demand_page(struct lg_cpu *cpu, unsigned long cr2, int errcode); void pin_page(struct lg_cpu *cpu, unsigned long vaddr); unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr); -void page_table_guest_data_init(struct lguest *lg); +void page_table_guest_data_init(struct lg_cpu *cpu); /* /core.c: */ void lguest_arch_host_init(void); @@ -197,7 +197,7 @@ void lguest_device_remove(void); /* hypercalls.c: */ void do_hypercalls(struct lg_cpu *cpu); -void write_timestamp(struct lguest *lg); +void write_timestamp(struct lg_cpu *cpu); /*L:035 * Let's step aside for the moment, to study one important routine that's used @@ -223,12 +223,12 @@ void write_timestamp(struct lguest *lg); * Like any macro which uses an "if", it is safely wrapped in a run-once "do { * } while(0)". */ -#define kill_guest(lg, fmt...) \ +#define kill_guest(cpu, fmt...) \ do { \ - if (!(lg)->dead) { \ - (lg)->dead = kasprintf(GFP_ATOMIC, fmt); \ - if (!(lg)->dead) \ - (lg)->dead = ERR_PTR(-ENOMEM); \ + if (!(cpu)->lg->dead) { \ + (cpu)->lg->dead = kasprintf(GFP_ATOMIC, fmt); \ + if (!(cpu)->lg->dead) \ + (cpu)->lg->dead = ERR_PTR(-ENOMEM); \ } \ } while(0) /* (End of aside) :*/ diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index c9acafcab2aa..983e9020cef8 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -68,17 +68,17 @@ static DEFINE_PER_CPU(pte_t *, switcher_pte_pages); * page directory entry (PGD) for that address. Since we keep track of several * page tables, the "i" argument tells us which one we're interested in (it's * usually the current one). */ -static pgd_t *spgd_addr(struct lguest *lg, u32 i, unsigned long vaddr) +static pgd_t *spgd_addr(struct lg_cpu *cpu, u32 i, unsigned long vaddr) { unsigned int index = pgd_index(vaddr); /* We kill any Guest trying to touch the Switcher addresses. */ if (index >= SWITCHER_PGD_INDEX) { - kill_guest(lg, "attempt to access switcher pages"); + kill_guest(cpu, "attempt to access switcher pages"); index = 0; } /* Return a pointer index'th pgd entry for the i'th page table. */ - return &lg->pgdirs[i].pgdir[index]; + return &cpu->lg->pgdirs[i].pgdir[index]; } /* This routine then takes the page directory entry returned above, which @@ -137,7 +137,7 @@ static unsigned long get_pfn(unsigned long virtpfn, int write) * entry can be a little tricky. The flags are (almost) the same, but the * Guest PTE contains a virtual page number: the CPU needs the real page * number. */ -static pte_t gpte_to_spte(struct lguest *lg, pte_t gpte, int write) +static pte_t gpte_to_spte(struct lg_cpu *cpu, pte_t gpte, int write) { unsigned long pfn, base, flags; @@ -148,7 +148,7 @@ static pte_t gpte_to_spte(struct lguest *lg, pte_t gpte, int write) flags = (pte_flags(gpte) & ~_PAGE_GLOBAL); /* The Guest's pages are offset inside the Launcher. */ - base = (unsigned long)lg->mem_base / PAGE_SIZE; + base = (unsigned long)cpu->lg->mem_base / PAGE_SIZE; /* We need a temporary "unsigned long" variable to hold the answer from * get_pfn(), because it returns 0xFFFFFFFF on failure, which wouldn't @@ -156,7 +156,7 @@ static pte_t gpte_to_spte(struct lguest *lg, pte_t gpte, int write) * page, given the virtual number. */ pfn = get_pfn(base + pte_pfn(gpte), write); if (pfn == -1UL) { - kill_guest(lg, "failed to get page %lu", pte_pfn(gpte)); + kill_guest(cpu, "failed to get page %lu", pte_pfn(gpte)); /* When we destroy the Guest, we'll go through the shadow page * tables and release_pte() them. Make sure we don't think * this one is valid! */ @@ -176,17 +176,18 @@ static void release_pte(pte_t pte) } /*:*/ -static void check_gpte(struct lguest *lg, pte_t gpte) +static void check_gpte(struct lg_cpu *cpu, pte_t gpte) { if ((pte_flags(gpte) & (_PAGE_PWT|_PAGE_PSE)) - || pte_pfn(gpte) >= lg->pfn_limit) - kill_guest(lg, "bad page table entry"); + || pte_pfn(gpte) >= cpu->lg->pfn_limit) + kill_guest(cpu, "bad page table entry"); } -static void check_gpgd(struct lguest *lg, pgd_t gpgd) +static void check_gpgd(struct lg_cpu *cpu, pgd_t gpgd) { - if ((pgd_flags(gpgd) & ~_PAGE_TABLE) || pgd_pfn(gpgd) >= lg->pfn_limit) - kill_guest(lg, "bad page directory entry"); + if ((pgd_flags(gpgd) & ~_PAGE_TABLE) || + (pgd_pfn(gpgd) >= cpu->lg->pfn_limit)) + kill_guest(cpu, "bad page directory entry"); } /*H:330 @@ -206,27 +207,26 @@ int demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode) unsigned long gpte_ptr; pte_t gpte; pte_t *spte; - struct lguest *lg = cpu->lg; /* First step: get the top-level Guest page table entry. */ - gpgd = lgread(lg, gpgd_addr(cpu, vaddr), pgd_t); + gpgd = lgread(cpu, gpgd_addr(cpu, vaddr), pgd_t); /* Toplevel not present? We can't map it in. */ if (!(pgd_flags(gpgd) & _PAGE_PRESENT)) return 0; /* Now look at the matching shadow entry. */ - spgd = spgd_addr(lg, cpu->cpu_pgd, vaddr); + spgd = spgd_addr(cpu, cpu->cpu_pgd, vaddr); if (!(pgd_flags(*spgd) & _PAGE_PRESENT)) { /* No shadow entry: allocate a new shadow PTE page. */ unsigned long ptepage = get_zeroed_page(GFP_KERNEL); /* This is not really the Guest's fault, but killing it is * simple for this corner case. */ if (!ptepage) { - kill_guest(lg, "out of memory allocating pte page"); + kill_guest(cpu, "out of memory allocating pte page"); return 0; } /* We check that the Guest pgd is OK. */ - check_gpgd(lg, gpgd); + check_gpgd(cpu, gpgd); /* And we copy the flags to the shadow PGD entry. The page * number in the shadow PGD is the page we just allocated. */ *spgd = __pgd(__pa(ptepage) | pgd_flags(gpgd)); @@ -235,7 +235,7 @@ int demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode) /* OK, now we look at the lower level in the Guest page table: keep its * address, because we might update it later. */ gpte_ptr = gpte_addr(gpgd, vaddr); - gpte = lgread(lg, gpte_ptr, pte_t); + gpte = lgread(cpu, gpte_ptr, pte_t); /* If this page isn't in the Guest page tables, we can't page it in. */ if (!(pte_flags(gpte) & _PAGE_PRESENT)) @@ -252,7 +252,7 @@ int demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode) /* Check that the Guest PTE flags are OK, and the page number is below * the pfn_limit (ie. not mapping the Launcher binary). */ - check_gpte(lg, gpte); + check_gpte(cpu, gpte); /* Add the _PAGE_ACCESSED and (for a write) _PAGE_DIRTY flag */ gpte = pte_mkyoung(gpte); @@ -268,17 +268,17 @@ int demand_page(struct lg_cpu *cpu, unsigned long vaddr, int errcode) /* If this is a write, we insist that the Guest page is writable (the * final arg to gpte_to_spte()). */ if (pte_dirty(gpte)) - *spte = gpte_to_spte(lg, gpte, 1); + *spte = gpte_to_spte(cpu, gpte, 1); else /* If this is a read, don't set the "writable" bit in the page * table entry, even if the Guest says it's writable. That way * we will come back here when a write does actually occur, so * we can update the Guest's _PAGE_DIRTY flag. */ - *spte = gpte_to_spte(lg, pte_wrprotect(gpte), 0); + *spte = gpte_to_spte(cpu, pte_wrprotect(gpte), 0); /* Finally, we write the Guest PTE entry back: we've set the * _PAGE_ACCESSED and maybe the _PAGE_DIRTY flags. */ - lgwrite(lg, gpte_ptr, pte_t, gpte); + lgwrite(cpu, gpte_ptr, pte_t, gpte); /* The fault is fixed, the page table is populated, the mapping * manipulated, the result returned and the code complete. A small @@ -303,7 +303,7 @@ static int page_writable(struct lg_cpu *cpu, unsigned long vaddr) unsigned long flags; /* Look at the current top level entry: is it present? */ - spgd = spgd_addr(cpu->lg, cpu->cpu_pgd, vaddr); + spgd = spgd_addr(cpu, cpu->cpu_pgd, vaddr); if (!(pgd_flags(*spgd) & _PAGE_PRESENT)) return 0; @@ -320,7 +320,7 @@ static int page_writable(struct lg_cpu *cpu, unsigned long vaddr) void pin_page(struct lg_cpu *cpu, unsigned long vaddr) { if (!page_writable(cpu, vaddr) && !demand_page(cpu, vaddr, 2)) - kill_guest(cpu->lg, "bad stack page %#lx", vaddr); + kill_guest(cpu, "bad stack page %#lx", vaddr); } /*H:450 If we chase down the release_pgd() code, it looks like this: */ @@ -372,14 +372,14 @@ unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr) pte_t gpte; /* First step: get the top-level Guest page table entry. */ - gpgd = lgread(cpu->lg, gpgd_addr(cpu, vaddr), pgd_t); + gpgd = lgread(cpu, gpgd_addr(cpu, vaddr), pgd_t); /* Toplevel not present? We can't map it in. */ if (!(pgd_flags(gpgd) & _PAGE_PRESENT)) - kill_guest(cpu->lg, "Bad address %#lx", vaddr); + kill_guest(cpu, "Bad address %#lx", vaddr); - gpte = lgread(cpu->lg, gpte_addr(gpgd, vaddr), pte_t); + gpte = lgread(cpu, gpte_addr(gpgd, vaddr), pte_t); if (!(pte_flags(gpte) & _PAGE_PRESENT)) - kill_guest(cpu->lg, "Bad address %#lx", vaddr); + kill_guest(cpu, "Bad address %#lx", vaddr); return pte_pfn(gpte) * PAGE_SIZE | (vaddr & ~PAGE_MASK); } @@ -404,16 +404,16 @@ static unsigned int new_pgdir(struct lg_cpu *cpu, int *blank_pgdir) { unsigned int next; - struct lguest *lg = cpu->lg; /* We pick one entry at random to throw out. Choosing the Least * Recently Used might be better, but this is easy. */ - next = random32() % ARRAY_SIZE(lg->pgdirs); + next = random32() % ARRAY_SIZE(cpu->lg->pgdirs); /* If it's never been allocated at all before, try now. */ - if (!lg->pgdirs[next].pgdir) { - lg->pgdirs[next].pgdir = (pgd_t *)get_zeroed_page(GFP_KERNEL); + if (!cpu->lg->pgdirs[next].pgdir) { + cpu->lg->pgdirs[next].pgdir = + (pgd_t *)get_zeroed_page(GFP_KERNEL); /* If the allocation fails, just keep using the one we have */ - if (!lg->pgdirs[next].pgdir) + if (!cpu->lg->pgdirs[next].pgdir) next = cpu->cpu_pgd; else /* This is a blank page, so there are no kernel @@ -421,9 +421,9 @@ static unsigned int new_pgdir(struct lg_cpu *cpu, *blank_pgdir = 1; } /* Record which Guest toplevel this shadows. */ - lg->pgdirs[next].gpgdir = gpgdir; + cpu->lg->pgdirs[next].gpgdir = gpgdir; /* Release all the non-kernel mappings. */ - flush_user_mappings(lg, next); + flush_user_mappings(cpu->lg, next); return next; } @@ -436,13 +436,12 @@ static unsigned int new_pgdir(struct lg_cpu *cpu, void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable) { int newpgdir, repin = 0; - struct lguest *lg = cpu->lg; /* Look to see if we have this one already. */ - newpgdir = find_pgdir(lg, pgtable); + newpgdir = find_pgdir(cpu->lg, pgtable); /* If not, we allocate or mug an existing one: if it's a fresh one, * repin gets set to 1. */ - if (newpgdir == ARRAY_SIZE(lg->pgdirs)) + if (newpgdir == ARRAY_SIZE(cpu->lg->pgdirs)) newpgdir = new_pgdir(cpu, pgtable, &repin); /* Change the current pgd index to the new one. */ cpu->cpu_pgd = newpgdir; @@ -499,11 +498,11 @@ void guest_pagetable_clear_all(struct lg_cpu *cpu) * _PAGE_ACCESSED then we can put a read-only PTE entry in immediately, and if * they set _PAGE_DIRTY then we can put a writable PTE entry in immediately. */ -static void do_set_pte(struct lguest *lg, int idx, +static void do_set_pte(struct lg_cpu *cpu, int idx, unsigned long vaddr, pte_t gpte) { /* Look up the matching shadow page directory entry. */ - pgd_t *spgd = spgd_addr(lg, idx, vaddr); + pgd_t *spgd = spgd_addr(cpu, idx, vaddr); /* If the top level isn't present, there's no entry to update. */ if (pgd_flags(*spgd) & _PAGE_PRESENT) { @@ -515,8 +514,8 @@ static void do_set_pte(struct lguest *lg, int idx, * as well put that entry they've given us in now. This shaves * 10% off a copy-on-write micro-benchmark. */ if (pte_flags(gpte) & (_PAGE_DIRTY | _PAGE_ACCESSED)) { - check_gpte(lg, gpte); - *spte = gpte_to_spte(lg, gpte, + check_gpte(cpu, gpte); + *spte = gpte_to_spte(cpu, gpte, pte_flags(gpte) & _PAGE_DIRTY); } else /* Otherwise kill it and we can demand_page() it in @@ -535,22 +534,22 @@ static void do_set_pte(struct lguest *lg, int idx, * * The benefit is that when we have to track a new page table, we can copy keep * all the kernel mappings. This speeds up context switch immensely. */ -void guest_set_pte(struct lguest *lg, +void guest_set_pte(struct lg_cpu *cpu, unsigned long gpgdir, unsigned long vaddr, pte_t gpte) { /* Kernel mappings must be changed on all top levels. Slow, but * doesn't happen often. */ - if (vaddr >= lg->kernel_address) { + if (vaddr >= cpu->lg->kernel_address) { unsigned int i; - for (i = 0; i < ARRAY_SIZE(lg->pgdirs); i++) - if (lg->pgdirs[i].pgdir) - do_set_pte(lg, i, vaddr, gpte); + for (i = 0; i < ARRAY_SIZE(cpu->lg->pgdirs); i++) + if (cpu->lg->pgdirs[i].pgdir) + do_set_pte(cpu, i, vaddr, gpte); } else { /* Is this page table one we have a shadow for? */ - int pgdir = find_pgdir(lg, gpgdir); - if (pgdir != ARRAY_SIZE(lg->pgdirs)) + int pgdir = find_pgdir(cpu->lg, gpgdir); + if (pgdir != ARRAY_SIZE(cpu->lg->pgdirs)) /* If so, do the update. */ - do_set_pte(lg, pgdir, vaddr, gpte); + do_set_pte(cpu, pgdir, vaddr, gpte); } } @@ -601,21 +600,23 @@ int init_guest_pagetable(struct lguest *lg, unsigned long pgtable) } /* When the Guest calls LHCALL_LGUEST_INIT we do more setup. */ -void page_table_guest_data_init(struct lguest *lg) +void page_table_guest_data_init(struct lg_cpu *cpu) { /* We get the kernel address: above this is all kernel memory. */ - if (get_user(lg->kernel_address, &lg->lguest_data->kernel_address) + if (get_user(cpu->lg->kernel_address, + &cpu->lg->lguest_data->kernel_address) /* We tell the Guest that it can't use the top 4MB of virtual * addresses used by the Switcher. */ - || put_user(4U*1024*1024, &lg->lguest_data->reserve_mem) - || put_user(lg->pgdirs[0].gpgdir, &lg->lguest_data->pgdir)) - kill_guest(lg, "bad guest page %p", lg->lguest_data); + || put_user(4U*1024*1024, &cpu->lg->lguest_data->reserve_mem) + || put_user(cpu->lg->pgdirs[0].gpgdir, &cpu->lg->lguest_data->pgdir)) + kill_guest(cpu, "bad guest page %p", cpu->lg->lguest_data); /* In flush_user_mappings() we loop from 0 to * "pgd_index(lg->kernel_address)". This assumes it won't hit the * Switcher mappings, so check that now. */ - if (pgd_index(lg->kernel_address) >= SWITCHER_PGD_INDEX) - kill_guest(lg, "bad kernel address %#lx", lg->kernel_address); + if (pgd_index(cpu->lg->kernel_address) >= SWITCHER_PGD_INDEX) + kill_guest(cpu, "bad kernel address %#lx", + cpu->lg->kernel_address); } /* When a Guest dies, our cleanup is fairly simple. */ diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c index 635f54c719ae..ec6aa3f1c36b 100644 --- a/drivers/lguest/segments.c +++ b/drivers/lguest/segments.c @@ -148,14 +148,13 @@ void copy_gdt(const struct lg_cpu *cpu, struct desc_struct *gdt) * We copy it from the Guest and tweak the entries. */ void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num) { - struct lguest *lg = cpu->lg; /* We assume the Guest has the same number of GDT entries as the * Host, otherwise we'd have to dynamically allocate the Guest GDT. */ if (num > ARRAY_SIZE(cpu->arch.gdt)) - kill_guest(lg, "too many gdt entries %i", num); + kill_guest(cpu, "too many gdt entries %i", num); /* We read the whole thing in, then fix it up. */ - __lgread(lg, cpu->arch.gdt, table, num * sizeof(cpu->arch.gdt[0])); + __lgread(cpu, cpu->arch.gdt, table, num * sizeof(cpu->arch.gdt[0])); fixup_gdt_table(cpu, 0, ARRAY_SIZE(cpu->arch.gdt)); /* Mark that the GDT changed so the core knows it has to copy it again, * even if the Guest is run on the same CPU. */ @@ -169,9 +168,8 @@ void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num) void guest_load_tls(struct lg_cpu *cpu, unsigned long gtls) { struct desc_struct *tls = &cpu->arch.gdt[GDT_ENTRY_TLS_MIN]; - struct lguest *lg = cpu->lg; - __lgread(lg, tls, gtls, sizeof(*tls)*GDT_ENTRY_TLS_ENTRIES); + __lgread(cpu, tls, gtls, sizeof(*tls)*GDT_ENTRY_TLS_ENTRIES); fixup_gdt_table(cpu, GDT_ENTRY_TLS_MIN, GDT_ENTRY_TLS_MAX+1); /* Note that just the TLS entries have changed. */ cpu->changed |= CHANGED_GDT_TLS; diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index fd6a8512443c..e9c3ba8aa1ec 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -117,7 +117,6 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages) { /* This is a dummy value we need for GCC's sake. */ unsigned int clobber; - struct lguest *lg = cpu->lg; /* Copy the guest-specific information into this CPU's "struct * lguest_pages". */ @@ -144,7 +143,7 @@ static void run_guest_once(struct lg_cpu *cpu, struct lguest_pages *pages) * 0-th argument above, ie "a"). %ebx contains the * physical address of the Guest's top-level page * directory. */ - : "0"(pages), "1"(__pa(lg->pgdirs[cpu->cpu_pgd].pgdir)) + : "0"(pages), "1"(__pa(cpu->lg->pgdirs[cpu->cpu_pgd].pgdir)) /* We tell gcc that all these registers could change, * which means we don't have to save and restore them in * the Switcher. */ @@ -217,7 +216,6 @@ void lguest_arch_run_guest(struct lg_cpu *cpu) * instructions and skip over it. We return true if we did. */ static int emulate_insn(struct lg_cpu *cpu) { - struct lguest *lg = cpu->lg; u8 insn; unsigned int insnlen = 0, in = 0, shift = 0; /* The eip contains the *virtual* address of the Guest's instruction: @@ -231,7 +229,7 @@ static int emulate_insn(struct lg_cpu *cpu) return 0; /* Decoding x86 instructions is icky. */ - insn = lgread(lg, physaddr, u8); + insn = lgread(cpu, physaddr, u8); /* 0x66 is an "operand prefix". It means it's using the upper 16 bits of the eax register. */ @@ -239,7 +237,7 @@ static int emulate_insn(struct lg_cpu *cpu) shift = 16; /* The instruction is 1 byte so far, read the next byte. */ insnlen = 1; - insn = lgread(lg, physaddr + insnlen, u8); + insn = lgread(cpu, physaddr + insnlen, u8); } /* We can ignore the lower bit for the moment and decode the 4 opcodes @@ -283,7 +281,6 @@ static int emulate_insn(struct lg_cpu *cpu) /*H:050 Once we've re-enabled interrupts, we look at why the Guest exited. */ void lguest_arch_handle_trap(struct lg_cpu *cpu) { - struct lguest *lg = cpu->lg; switch (cpu->regs->trapnum) { case 13: /* We've intercepted a General Protection Fault. */ /* Check if this was one of those annoying IN or OUT @@ -315,9 +312,10 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) * Note that if the Guest were really messed up, this could * happen before it's done the LHCALL_LGUEST_INIT hypercall, so * lg->lguest_data could be NULL */ - if (lg->lguest_data && - put_user(cpu->arch.last_pagefault, &lg->lguest_data->cr2)) - kill_guest(lg, "Writing cr2"); + if (cpu->lg->lguest_data && + put_user(cpu->arch.last_pagefault, + &cpu->lg->lguest_data->cr2)) + kill_guest(cpu, "Writing cr2"); break; case 7: /* We've intercepted a Device Not Available fault. */ /* If the Guest doesn't want to know, we already restored the @@ -345,7 +343,7 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) /* If the Guest doesn't have a handler (either it hasn't * registered any yet, or it's one of the faults we don't let * it handle), it dies with a cryptic error message. */ - kill_guest(lg, "unhandled trap %li at %#lx (%#lx)", + kill_guest(cpu, "unhandled trap %li at %#lx (%#lx)", cpu->regs->trapnum, cpu->regs->eip, cpu->regs->trapnum == 14 ? cpu->arch.last_pagefault : cpu->regs->errcode); @@ -514,11 +512,11 @@ int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args) int lguest_arch_init_hypercalls(struct lg_cpu *cpu) { u32 tsc_speed; - struct lguest *lg = cpu->lg; /* The pointer to the Guest's "struct lguest_data" is the only * argument. We check that address now. */ - if (!lguest_address_ok(lg, cpu->hcall->arg1, sizeof(*lg->lguest_data))) + if (!lguest_address_ok(cpu->lg, cpu->hcall->arg1, + sizeof(*cpu->lg->lguest_data))) return -EFAULT; /* Having checked it, we simply set lg->lguest_data to point straight @@ -526,7 +524,7 @@ int lguest_arch_init_hypercalls(struct lg_cpu *cpu) * copy_to_user/from_user from now on, instead of lgread/write. I put * this in to show that I'm not immune to writing stupid * optimizations. */ - lg->lguest_data = lg->mem_base + cpu->hcall->arg1; + cpu->lg->lguest_data = cpu->lg->mem_base + cpu->hcall->arg1; /* We insist that the Time Stamp Counter exist and doesn't change with * cpu frequency. Some devious chip manufacturers decided that TSC @@ -539,12 +537,12 @@ int lguest_arch_init_hypercalls(struct lg_cpu *cpu) tsc_speed = tsc_khz; else tsc_speed = 0; - if (put_user(tsc_speed, &lg->lguest_data->tsc_khz)) + if (put_user(tsc_speed, &cpu->lg->lguest_data->tsc_khz)) return -EFAULT; /* The interrupt code might not like the system call vector. */ - if (!check_syscall_vector(lg)) - kill_guest(lg, "bad syscall vector"); + if (!check_syscall_vector(cpu->lg)) + kill_guest(cpu, "bad syscall vector"); return 0; } -- cgit v1.2.3-59-g8ed1b