linux-kernel - Re: [PATCH 0/2] KVM: selftests: Fix sync

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Message-ID: <169297947911.2871633.4127274459666234045.b4-ty@google.com>
Date:   Fri, 25 Aug 2023 12:01:42 -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,
        Michal Luczaj <mhal@...x.co>
Subject: Re: [PATCH 0/2] KVM: selftests: Fix sync_regs race tests on AMD

On Thu, 17 Aug 2023 16:34:28 -0700, Sean Christopherson wrote:
> The recently introduced sync_regs subtests to detect TOCTOU bugs hang on
> AMD because KVM synthesizes INIT on triple fault shutdown (because AMD says
> the VMCB is undefined after shutdown).  Fix it by loading known good state
> if a shutdown occurs.
> 
> Patch two explicitly injects #UD as the "good" vector so that the test
> doesn't rely on KVM inadvertantly setting the vector to #DE (old, buggy
> behavior).
> 
> [...]

Applied to kvm-x86 selftests.

[1/2] KVM: selftests: Reload "good" vCPU state if vCPU hits shutdown
      https://github.com/kvm-x86/linux/commit/5002b112a5ad
[2/2] KVM: selftests: Explicit set #UD when *potentially* injecting exception
      https://github.com/kvm-x86/linux/commit/02dc2543e379

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