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SubjectRe: [RFC v2-fix-v5 1/1] x86: Skip WBINVD instruction for VM guest
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On 6/9/21 2:38 PM, Dan Williams wrote:
>> In TDX guests, these WBINVD operations cause #VE exceptions. For debug,
>> it would be ideal for the #VE handler to be able to WARN() when an
>> unexpected WBINVD occurs. (<--- problem #2)
> ...but it doesn't WARN() it triggers unhandled #VE, unless I missed
> another patch that precedes this that turns it into a WARN()? If a
> code path expects WBINVD for correct operation and the guest can't
> execute that sounds fatal, not a WARN to me.

Yes. It is not WARN. It is a fatal unhandled exception.

>

--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer

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