diff options
Diffstat (limited to 'arch/x86/xen/enlighten_pv.c')
-rw-r--r-- | arch/x86/xen/enlighten_pv.c | 178 |
1 files changed, 79 insertions, 99 deletions
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index 811e4ddb3f37..69b9deff7e5c 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -263,6 +263,13 @@ static void __init xen_init_capabilities(void) setup_clear_cpu_cap(X86_FEATURE_MTRR); setup_clear_cpu_cap(X86_FEATURE_ACC); setup_clear_cpu_cap(X86_FEATURE_X2APIC); + setup_clear_cpu_cap(X86_FEATURE_SME); + + /* + * Xen PV would need some work to support PCID: CR3 handling as well + * as xen_flush_tlb_others() would need updating. + */ + setup_clear_cpu_cap(X86_FEATURE_PCID); if (!xen_initial_domain()) setup_clear_cpu_cap(X86_FEATURE_ACPI); @@ -494,7 +501,7 @@ static void __init xen_load_gdt_boot(const struct desc_ptr *dtr) static inline bool desc_equal(const struct desc_struct *d1, const struct desc_struct *d2) { - return d1->a == d2->a && d1->b == d2->b; + return !memcmp(d1, d2, sizeof(*d1)); } static void load_TLS_descriptor(struct thread_struct *t, @@ -579,59 +586,91 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum, preempt_enable(); } +#ifdef CONFIG_X86_64 +struct trap_array_entry { + void (*orig)(void); + void (*xen)(void); + bool ist_okay; +}; + +static struct trap_array_entry trap_array[] = { + { debug, xen_xendebug, true }, + { int3, xen_xenint3, true }, + { double_fault, xen_double_fault, true }, +#ifdef CONFIG_X86_MCE + { machine_check, xen_machine_check, true }, +#endif + { nmi, xen_nmi, true }, + { overflow, xen_overflow, false }, +#ifdef CONFIG_IA32_EMULATION + { entry_INT80_compat, xen_entry_INT80_compat, false }, +#endif + { page_fault, xen_page_fault, false }, + { divide_error, xen_divide_error, false }, + { bounds, xen_bounds, false }, + { invalid_op, xen_invalid_op, false }, + { device_not_available, xen_device_not_available, false }, + { coprocessor_segment_overrun, xen_coprocessor_segment_overrun, false }, + { invalid_TSS, xen_invalid_TSS, false }, + { segment_not_present, xen_segment_not_present, false }, + { stack_segment, xen_stack_segment, false }, + { general_protection, xen_general_protection, false }, + { spurious_interrupt_bug, xen_spurious_interrupt_bug, false }, + { coprocessor_error, xen_coprocessor_error, false }, + { alignment_check, xen_alignment_check, false }, + { simd_coprocessor_error, xen_simd_coprocessor_error, false }, +}; + +static bool get_trap_addr(void **addr, unsigned int ist) +{ + unsigned int nr; + bool ist_okay = false; + + /* + * Replace trap handler addresses by Xen specific ones. + * Check for known traps using IST and whitelist them. + * The debugger ones are the only ones we care about. + * Xen will handle faults like double_fault, * so we should never see + * them. Warn if there's an unexpected IST-using fault handler. + */ + for (nr = 0; nr < ARRAY_SIZE(trap_array); nr++) { + struct trap_array_entry *entry = trap_array + nr; + + if (*addr == entry->orig) { + *addr = entry->xen; + ist_okay = entry->ist_okay; + break; + } + } + + if (WARN_ON(ist != 0 && !ist_okay)) + return false; + + return true; +} +#endif + static int cvt_gate_to_trap(int vector, const gate_desc *val, struct trap_info *info) { unsigned long addr; - if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT) + if (val->bits.type != GATE_TRAP && val->bits.type != GATE_INTERRUPT) return 0; info->vector = vector; - addr = gate_offset(*val); + addr = gate_offset(val); #ifdef CONFIG_X86_64 - /* - * Look for known traps using IST, and substitute them - * appropriately. The debugger ones are the only ones we care - * about. Xen will handle faults like double_fault, - * so we should never see them. Warn if - * there's an unexpected IST-using fault handler. - */ - if (addr == (unsigned long)debug) - addr = (unsigned long)xen_debug; - else if (addr == (unsigned long)int3) - addr = (unsigned long)xen_int3; - else if (addr == (unsigned long)stack_segment) - addr = (unsigned long)xen_stack_segment; - else if (addr == (unsigned long)double_fault) { - /* Don't need to handle these */ + if (!get_trap_addr((void **)&addr, val->bits.ist)) return 0; -#ifdef CONFIG_X86_MCE - } else if (addr == (unsigned long)machine_check) { - /* - * when xen hypervisor inject vMCE to guest, - * use native mce handler to handle it - */ - ; -#endif - } else if (addr == (unsigned long)nmi) - /* - * Use the native version as well. - */ - ; - else { - /* Some other trap using IST? */ - if (WARN_ON(val->ist != 0)) - return 0; - } #endif /* CONFIG_X86_64 */ info->address = addr; - info->cs = gate_segment(*val); - info->flags = val->dpl; + info->cs = gate_segment(val); + info->flags = val->bits.dpl; /* interrupt gates clear IF */ - if (val->type == GATE_INTERRUPT) + if (val->bits.type == GATE_INTERRUPT) info->flags |= 1 << 2; return 1; @@ -981,59 +1020,6 @@ void __ref xen_setup_vcpu_info_placement(void) } } -static unsigned xen_patch(u8 type, u16 clobbers, void *insnbuf, - unsigned long addr, unsigned len) -{ - char *start, *end, *reloc; - unsigned ret; - - start = end = reloc = NULL; - -#define SITE(op, x) \ - case PARAVIRT_PATCH(op.x): \ - if (xen_have_vcpu_info_placement) { \ - start = (char *)xen_##x##_direct; \ - end = xen_##x##_direct_end; \ - reloc = xen_##x##_direct_reloc; \ - } \ - goto patch_site - - switch (type) { - SITE(pv_irq_ops, irq_enable); - SITE(pv_irq_ops, irq_disable); - SITE(pv_irq_ops, save_fl); - SITE(pv_irq_ops, restore_fl); -#undef SITE - - patch_site: - if (start == NULL || (end-start) > len) - goto default_patch; - - ret = paravirt_patch_insns(insnbuf, len, start, end); - - /* Note: because reloc is assigned from something that - appears to be an array, gcc assumes it's non-null, - but doesn't know its relationship with start and - end. */ - if (reloc > start && reloc < end) { - int reloc_off = reloc - start; - long *relocp = (long *)(insnbuf + reloc_off); - long delta = start - (char *)addr; - - *relocp += delta; - } - break; - - default_patch: - default: - ret = paravirt_patch_default(type, clobbers, insnbuf, - addr, len); - break; - } - - return ret; -} - static const struct pv_info xen_info __initconst = { .shared_kernel_pmd = 0, @@ -1043,10 +1029,6 @@ static const struct pv_info xen_info __initconst = { .name = "Xen", }; -static const struct pv_init_ops xen_init_ops __initconst = { - .patch = xen_patch, -}; - static const struct pv_cpu_ops xen_cpu_ops __initconst = { .cpuid = xen_cpuid, @@ -1056,7 +1038,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = { .read_cr0 = xen_read_cr0, .write_cr0 = xen_write_cr0, - .read_cr4 = native_read_cr4, .write_cr4 = xen_write_cr4, #ifdef CONFIG_X86_64 @@ -1091,7 +1072,6 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = { .alloc_ldt = xen_alloc_ldt, .free_ldt = xen_free_ldt, - .store_idt = native_store_idt, .store_tr = xen_store_tr, .write_ldt_entry = xen_write_ldt_entry, @@ -1244,7 +1224,7 @@ asmlinkage __visible void __init xen_start_kernel(void) /* Install Xen paravirt ops */ pv_info = xen_info; - pv_init_ops = xen_init_ops; + pv_init_ops.patch = paravirt_patch_default; pv_cpu_ops = xen_cpu_ops; x86_platform.get_nmi_reason = xen_get_nmi_reason; |