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x86/extable: Remove EX_TYPE_FAULT from MCE safe fixups

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Now that the MC safe copy and FPU have been converted to use the MCE safe
fixup types remove EX_TYPE_FAULT from the list of types which MCE considers
to be safe to be recovered in kernel.

This removes the SGX exception handling of ENCLS from the #MC safe
handling, but according to the SGX wizards the current SGX implementations
cannot survive #MC on ENCLS:

  https://lore.kernel.org/r/YS+upEmTfpZub3s9@google.com

The code relies on the trap number being stored if ENCLS raised an
exception. That's still working, but it does no longer trick the MCE code
into assuming that #MC is handled correctly for ENCLS.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210908132525.445255957@linutronix.de
This commit is contained in:
Thomas Gleixner
2021-09-08 15:29:24 +02:00
committed by Borislav Petkov
parent c6304556f3
commit 0c2e62ba04
1 changed files with 0 additions and 1 deletions
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1
arch/x86/kernel/cpu/mce/severity.c
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@@ -277,7 +277,6 @@ static int error_context(struct mce *m, struct pt_regs *regs)
return IN_KERNEL;
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;