The following commit has been merged into the x86/fpu branch of tip: Commit-ID: 2cadf5248b9316d3c8af876e795d61c55476f6e9 Gitweb: https://git.kernel.org/tip/2cadf5248b9316d3c8af876e795d61c55476f6e9 Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx> AuthorDate: Wed, 08 Sep 2021 15:29:19 +02:00 Committer: Borislav Petkov <bp@xxxxxxx> CommitterDate: Mon, 13 Sep 2021 17:56:56 +02:00 x86/extable: Provide EX_TYPE_DEFAULT_MCE_SAFE and EX_TYPE_FAULT_MCE_SAFE Provide exception fixup types which can be used to identify fixups which allow in kernel #MC recovery and make them invoke the existing handlers. These will be used at places where #MC recovery is handled correctly by the caller. Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Link: https://lkml.kernel.org/r/20210908132525.269689153@xxxxxxxxxxxxx --- arch/x86/include/asm/extable_fixup_types.h | 3 +++ arch/x86/kernel/cpu/mce/severity.c | 2 ++ arch/x86/mm/extable.c | 2 ++ 3 files changed, 7 insertions(+) diff --git a/arch/x86/include/asm/extable_fixup_types.h b/arch/x86/include/asm/extable_fixup_types.h index 0adc117..409524d 100644 --- a/arch/x86/include/asm/extable_fixup_types.h +++ b/arch/x86/include/asm/extable_fixup_types.h @@ -16,4 +16,7 @@ #define EX_TYPE_WRMSR_IN_MCE 10 #define EX_TYPE_RDMSR_IN_MCE 11 +#define EX_TYPE_DEFAULT_MCE_SAFE 12 +#define EX_TYPE_FAULT_MCE_SAFE 13 + #endif diff --git a/arch/x86/kernel/cpu/mce/severity.c b/arch/x86/kernel/cpu/mce/severity.c index 74fe763..d9b77a7 100644 --- a/arch/x86/kernel/cpu/mce/severity.c +++ b/arch/x86/kernel/cpu/mce/severity.c @@ -278,6 +278,8 @@ static int error_context(struct mce *m, struct pt_regs *regs) m->kflags |= MCE_IN_KERNEL_COPYIN; fallthrough; case EX_TYPE_FAULT: + case EX_TYPE_FAULT_MCE_SAFE: + case EX_TYPE_DEFAULT_MCE_SAFE: m->kflags |= MCE_IN_KERNEL_RECOV; return IN_KERNEL_RECOV; default: diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c index 5db46df..f37e290 100644 --- a/arch/x86/mm/extable.c +++ b/arch/x86/mm/extable.c @@ -131,8 +131,10 @@ int fixup_exception(struct pt_regs *regs, int trapnr, unsigned long error_code, switch (e->type) { case EX_TYPE_DEFAULT: + case EX_TYPE_DEFAULT_MCE_SAFE: return ex_handler_default(e, regs); case EX_TYPE_FAULT: + case EX_TYPE_FAULT_MCE_SAFE: return ex_handler_fault(e, regs, trapnr); case EX_TYPE_UACCESS: return ex_handler_uaccess(e, regs, trapnr);
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