linux-kernel - Re: [PATCH] KVM: x86: Document a virtualization gap for GIF on AMD CPUs

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Message-ID: <176350814750.2284663.7850374301770413168.b4-ty@google.com>
Date: Tue, 18 Nov 2025 15:27:50 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Yosry Ahmed <yosry.ahmed@...ux.dev>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Jim Mattson <jmattson@...gle.com>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Document a virtualization gap for GIF on AMD CPUs

On Thu, 30 Oct 2025 22:37:57 +0000, Yosry Ahmed wrote:
> According to the APM Volume #2, Section 15.17, Table 15-10 (24593—Rev.
> 3.42—March 2024), When "GIF==0", an "Debug exception or trap, due to
> breakpoint register match" should be "Ignored and discarded".
> 
> KVM lacks any handling of this. Even when vGIF is enabled and vGIF==0,
> the CPU does not ignore #DBs and relies on the VMM to do so.
> 
> [...]

Applied to kvm-x86 svm, thanks!

[1/1] KVM: x86: Document a virtualization gap for GIF on AMD CPUs
      https://github.com/kvm-x86/linux/commit/9f4ce4878878

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