diff options
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 55 |
1 files changed, 39 insertions, 16 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 760789ae8562..cd993051aed7 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -23,7 +23,7 @@ #include <linux/sched.h> #include <linux/kprobes.h> #include <linux/bootmem.h> -#include <linux/module.h> +#include <linux/export.h> #include <linux/mm.h> #include <linux/page-flags.h> #include <linux/highmem.h> @@ -59,6 +59,7 @@ #include <asm/xen/pci.h> #include <asm/xen/hypercall.h> #include <asm/xen/hypervisor.h> +#include <asm/xen/cpuid.h> #include <asm/fixmap.h> #include <asm/processor.h> #include <asm/proto.h> @@ -118,6 +119,10 @@ DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu); */ DEFINE_PER_CPU(struct vcpu_info, xen_vcpu_info); +/* Linux <-> Xen vCPU id mapping */ +DEFINE_PER_CPU(int, xen_vcpu_id) = -1; +EXPORT_PER_CPU_SYMBOL(xen_vcpu_id); + enum xen_domain_type xen_domain_type = XEN_NATIVE; EXPORT_SYMBOL_GPL(xen_domain_type); @@ -179,7 +184,7 @@ static void clamp_max_cpus(void) #endif } -static void xen_vcpu_setup(int cpu) +void xen_vcpu_setup(int cpu) { struct vcpu_register_vcpu_info info; int err; @@ -202,8 +207,9 @@ static void xen_vcpu_setup(int cpu) if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu)) return; } - if (cpu < MAX_VIRT_CPUS) - per_cpu(xen_vcpu,cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; + if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS) + per_cpu(xen_vcpu, cpu) = + &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)]; if (!have_vcpu_info_placement) { if (cpu >= MAX_VIRT_CPUS) @@ -223,7 +229,8 @@ static void xen_vcpu_setup(int cpu) hypervisor has no unregister variant and this hypercall does not allow to over-write info.mfn and info.offset. */ - err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info); + err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu), + &info); if (err) { printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err); @@ -247,10 +254,11 @@ void xen_vcpu_restore(void) for_each_possible_cpu(cpu) { bool other_cpu = (cpu != smp_processor_id()); - bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL); + bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu), + NULL); if (other_cpu && is_up && - HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL)) + HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL)) BUG(); xen_setup_runstate_info(cpu); @@ -259,7 +267,7 @@ void xen_vcpu_restore(void) xen_vcpu_setup(cpu); if (other_cpu && is_up && - HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) + HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL)) BUG(); } } @@ -521,9 +529,7 @@ static void set_aliased_prot(void *v, pgprot_t prot) preempt_disable(); - pagefault_disable(); /* Avoid warnings due to being atomic. */ - __get_user(dummy, (unsigned char __user __force *)v); - pagefault_enable(); + probe_kernel_read(&dummy, v, 1); if (HYPERVISOR_update_va_mapping((unsigned long)v, pte, 0)) BUG(); @@ -590,7 +596,7 @@ static void xen_load_gdt(const struct desc_ptr *dtr) { unsigned long va = dtr->address; unsigned int size = dtr->size + 1; - unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; + unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE); unsigned long frames[pages]; int f; @@ -639,7 +645,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr) { unsigned long va = dtr->address; unsigned int size = dtr->size + 1; - unsigned pages = (size + PAGE_SIZE - 1) / PAGE_SIZE; + unsigned pages = DIV_ROUND_UP(size, PAGE_SIZE); unsigned long frames[pages]; int f; @@ -1137,8 +1143,11 @@ void xen_setup_vcpu_info_placement(void) { int cpu; - for_each_possible_cpu(cpu) + for_each_possible_cpu(cpu) { + /* Set up direct vCPU id mapping for PV guests. */ + per_cpu(xen_vcpu_id, cpu) = cpu; xen_vcpu_setup(cpu); + } /* xen_vcpu_setup managed to place the vcpu_info within the * percpu area for all cpus, so make use of it. Note that for @@ -1729,6 +1738,9 @@ asmlinkage __visible void __init xen_start_kernel(void) #endif xen_raw_console_write("about to get started...\n"); + /* Let's presume PV guests always boot on vCPU with id 0. */ + per_cpu(xen_vcpu_id, 0) = 0; + xen_setup_runstate_info(0); xen_efi_init(); @@ -1770,9 +1782,10 @@ void __ref xen_hvm_init_shared_info(void) * in that case multiple vcpus might be online. */ for_each_online_cpu(cpu) { /* Leave it to be NULL. */ - if (cpu >= MAX_VIRT_CPUS) + if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS) continue; - per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu]; + per_cpu(xen_vcpu, cpu) = + &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)]; } } @@ -1797,6 +1810,12 @@ static void __init init_hvm_pv_info(void) xen_setup_features(); + cpuid(base + 4, &eax, &ebx, &ecx, &edx); + if (eax & XEN_HVM_CPUID_VCPU_ID_PRESENT) + this_cpu_write(xen_vcpu_id, ebx); + else + this_cpu_write(xen_vcpu_id, smp_processor_id()); + pv_info.name = "Xen HVM"; xen_domain_type = XEN_HVM_DOMAIN; @@ -1808,6 +1827,10 @@ static int xen_hvm_cpu_notify(struct notifier_block *self, unsigned long action, int cpu = (long)hcpu; switch (action) { case CPU_UP_PREPARE: + if (cpu_acpi_id(cpu) != U32_MAX) + per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu); + else + per_cpu(xen_vcpu_id, cpu) = cpu; xen_vcpu_setup(cpu); if (xen_have_vector_callback) { if (xen_feature(XENFEAT_hvm_safe_pvclock)) |