linux-kernel - Re: [PATCH v2 0/4] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

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Date:   Fri, 25 Aug 2023 12:02:09 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wu Zongyo <wuzongyo@...l.ustc.edu.cn>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH v2 0/4] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

On Thu, 24 Aug 2023 18:36:17 -0700, Sean Christopherson wrote:
> Fix a bug where KVM injects a bogus #UD for SEV guests when trying to skip
> an INT3 as part of re-injecting the associated #BP that got kinda sorta
> intercepted due to a #NPF occuring while vectoring/delivering the #BP.
> 
> Patch 1 is the main fix.  It's a little ugly, but suitable for backporting.
> 
> Patch 2 is a tangentially related cleanup to make NRIPS a requirement for
> enabling SEV, e.g. so that we don't ever get "bug" reports of SEV guests
> not working when NRIPS is disabled.
> 
> [...]

Applied 1 and 2 to kvm-x86 svm, the more aggressive cleanup can definitely wait
until 6.7.

[1/4] KVM: SVM: Don't inject #UD if KVM attempts to skip SEV guest insn
      https://github.com/kvm-x86/linux/commit/cb49631ad111
[2/4] KVM: SVM: Require nrips support for SEV guests (and beyond)
      https://github.com/kvm-x86/linux/commit/80d0f521d59e

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes