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x86/extable: Provide EX_TYPE_DEFAULT_MCE_SAFE and EX_TYPE_FAULT_MCE_SAFE

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[ Upstream commit 2cadf5248b ]

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@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210908132525.269689153@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Gleixner 2021-09-08 15:29:19 +02:00 • committed by Justin Hammond
parent 260724cab0
commit a4dda0e9d9
3 changed files with 7 additions and 0 deletions
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3
arch/x86/include/asm/extable_fixup_types.h
View file

@ -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

2
arch/x86/kernel/cpu/mce/severity.c
View file

@ -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:

2
arch/x86/mm/extable.c
View file

@ -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);