| From | Thomas Gleixner <> | Subject | [patch V3 09/20] x86/extable: Remove EX_TYPE_FAULT from MCE safe fixups | Date | Wed, 8 Sep 2021 15:29:24 +0200 (CEST) |
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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 not longer trick the MCE code to assume that #MC is handled correctly for ENCLS.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- V2: New patch --- arch/x86/kernel/cpu/mce/severity.c | 1 - 1 file changed, 1 deletion(-)
--- a/arch/x86/kernel/cpu/mce/severity.c +++ b/arch/x86/kernel/cpu/mce/severity.c @@ -277,7 +277,6 @@ static int error_context(struct mce *m, 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;
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