Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 31 Jan 2023 17:00:29 +0100 | From | Joerg Roedel <> | Subject | Re: [Question PATCH kernel] x86/amd/sev/nmi+vc: Fix stack handling (why is this happening?) |
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On Tue, Jan 31, 2023 at 03:53:39PM +0000, Sean Christopherson wrote: > I don't think that is technically true. A _well-behaved_ hypervisor will not > intercept DR0-DR6 accesses for SEV-ES guests, but AFAICT nothing in the SEV-ES > architecture enforces that behavior.
Not from the hardware architecture side, but the GHCB spec does not list NAE events for DR0-DR6 accesses, so a guest is not required to handle them in the VC handler.
Linux under SEV-ES will crash if the HV intercepts debug registers, except DR7.
Regards,
Joerg
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