Messages in this thread | | | Subject | Re: [patch 01/10] x86/fpu/signal: Clarify exception handling in restore_fpregs_from_user() | From | Dave Hansen <> | Date | Wed, 1 Sep 2021 12:22:58 -0700 |
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On 9/1/21 9:47 AM, Sean Christopherson wrote: > As for SGX consuming the trap number in general, it's correct. For non-KVM usage, > it's nice to have but not strictly necessary. Any fault except #PF on ENCLS is > guaranteed to be a kernel or hardware bug; SGX uses the trap number to WARN on a > !#PF exception, e.g. on #GP or #UD. Not having the trap number would mean losing > those sanity checks, which have been useful in the past.
Yeah, for bare-metal SGX, the trap number only determines if we get a warning or not. There's no attempt at recovery or any consequential change in behavior due to the trap number (other than the warning).
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