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 16:31:35 -0500
From:   Tom Lendacky <thomas.lendacky@....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>
Subject: Re: [PATCH v2 0/4] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

On 8/25/23 14:02, Sean Christopherson wrote:
> 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

Thanks, Sean!

I'm taking it through our testing and will let know if anything pops up. 
Since you have a recreate I don't expect anything, though.

Thanks,
Tom

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