linux-kernel - Re: [PATCH v2] Add KVM_EXIT_SHUTDOWN metadata for SEV-ES

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Message-ID: <CAMkAt6q-wTxiQnFXhiw3gR_8ktfz9pLp3gZS3EFakGcBgxUJ2A@mail.gmail.com>
Date:   Wed, 30 Mar 2022 12:30:28 -0600
From:   Peter Gonda <pgonda@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm list <kvm@...r.kernel.org>, Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        Joerg Roedel <jroedel@...e.de>, Marc Orr <marcorr@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] Add KVM_EXIT_SHUTDOWN metadata for SEV-ES

On Fri, Mar 25, 2022 at 10:53 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> On 3/25/22 16:31, Peter Gonda wrote:
> > On Fri, Mar 25, 2022 at 9:29 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
> >>
> >> On 3/25/22 16:27, Peter Gonda wrote:
> >>> SEV-ES guests can request termination using the GHCB's MSR protocol. See
> >>> AMD's GHCB spec section '4.1.13 Termination Request'. Currently when a
> >>> guest does this the userspace VMM sees an KVM_EXIT_UNKNOWN (-EVINAL)
> >>> return code from KVM_RUN. By adding a KVM_EXIT_SHUTDOWN_ENTRY to kvm_run
> >>> struct the userspace VMM can clear see the guest has requested a SEV-ES
> >>> termination including the termination reason code set and reason code.
> >>>
> >>> Signed-off-by: Peter Gonda <pgonda@...gle.com>
> >>> Cc: Paolo Bonzini <pbonzini@...hat.com>
> >>> Cc: Borislav Petkov <bp@...en8.de>
> >>> Cc: Tom Lendacky <thomas.lendacky@....com>
> >>> Cc: Brijesh Singh <brijesh.singh@....com>
> >>> Cc: Joerg Roedel <jroedel@...e.de>
> >>> Cc: Marc Orr <marcorr@...gle.com>
> >>> Cc: Sean Christopherson <seanjc@...gle.com>
> >>> Cc: kvm@...r.kernel.org
> >>> Cc: linux-kernel@...r.kernel.org
> >>
> >> This is missing an update to Documentation/.
> >>
> >
> > My mistake. I'll send another revision. Is the behavior of
> > KVM_CAP_EXIT_SHUTDOWN_REASON OK? Or should we only return 1 for SEV-ES
> > guests?
>
> No, you can return 1 unconditionally, but you should also set reason and
> clear ndata in the other cases that return KVM_EXIT_SHUTDOWN.


Sounds good! Done in V3, thanks