From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Yosry Ahmed <yosry.ahmed@linux.dev>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Jim Mattson <jmattson@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] KVM: x86: Document a virtualization gap for GIF on AMD CPUs
Date: Tue, 18 Nov 2025 15:27:50 -0800 [thread overview]
Message-ID: <176350814750.2284663.7850374301770413168.b4-ty@google.com> (raw)
In-Reply-To: <20251030223757.2950309-1-yosry.ahmed@linux.dev>
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
prev parent reply other threads:[~2025-11-18 23:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-30 22:37 Yosry Ahmed
2025-10-31 0:09 ` Bagas Sanjaya
2025-11-18 23:27 ` Sean Christopherson [this message]
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