From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 11102176FB1 for ; Sun, 3 May 2026 12:18:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777810695; cv=none; b=MEuRuQ9UVQuArutdgWTOhrViQtIwA/dsXElIpH5lwwelItOzoIvJEI1uIG+vHoIW1cDkqaGfAHUnHEkvQg80J+06cY7NuIaxVelx0EHG11mbNUZmzuIjnOLJKsjri7Qv0bEYjeLx8ui0HwTjJq8l/qIg11i1DWv00IdRIGbqoTA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777810695; c=relaxed/simple; bh=jpeQJsqD8AfwriGHQap3Wc3HLxEnx4Xqov+yO0asA9k=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=ricVY2BFcRLAVzuXkVXOwzJqUChF4a4So49yu1u+EyjwlofI3gVx/IDiddEZr3YY1c5kkmv+DtJUh+TC6TmTjgQj0Yll899qQzNU62sD3FRAfwQtg9jGd9YV617Qm9wXpZi67LCWpTlJCqbTFJGrqMoYM9HlgsEbgI7XLeyVR+Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LMXCs8mq; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="LMXCs8mq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 56128C2BCB4; Sun, 3 May 2026 12:18:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777810694; bh=jpeQJsqD8AfwriGHQap3Wc3HLxEnx4Xqov+yO0asA9k=; h=Subject:To:Cc:From:Date:From; b=LMXCs8mqsUgGsKnScRmd8t4q49d6w5YWOAQ+PC8DLF15kUZW8m4yKkvKRtLOPSJ3J 77Y+7uY5ILh1QszFqDkbyxY5x437NqMQV5IPZw5P7EZTBg2nBojISMEG8PQWeisMpu BpWftYoMxqGGCedDIkrnOqLwUUP4AxZKwMYiPESo= Subject: FAILED: patch "[PATCH] KVM: nSVM: Clear EVENTINJ fields in vmcb12 on nested #VMEXIT" failed to apply to 5.15-stable tree To: yosry@kernel.org,seanjc@google.com Cc: From: Date: Sun, 03 May 2026 14:18:04 +0200 Message-ID: <2026050304-demeaning-gala-e020@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 69b721a86d0dcb026f6db7d111dcde7550442d2e # git commit -s git send-email --to '' --in-reply-to '2026050304-demeaning-gala-e020@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 69b721a86d0dcb026f6db7d111dcde7550442d2e Mon Sep 17 00:00:00 2001 From: Yosry Ahmed Date: Tue, 3 Mar 2026 00:34:05 +0000 Subject: [PATCH] KVM: nSVM: Clear EVENTINJ fields in vmcb12 on nested #VMEXIT According to the APM, from the reference of the VMRUN instruction: Upon #VMEXIT, the processor performs the following actions in order to return to the host execution context: ... clear EVENTINJ field in VMCB KVM already syncs EVENTINJ fields from vmcb02 to cached vmcb12 on every L2->L0 #VMEXIT. Since these fields are zeroed by the CPU on #VMEXIT, they will mostly be zeroed in vmcb12 on nested #VMEXIT by nested_svm_vmexit(). However, this is not the case when: 1. Consistency checks fail, as nested_svm_vmexit() is not called. 2. Entering guest mode fails before L2 runs (e.g. due to failed load of CR3). (2) was broken by commit 2d8a42be0e2b ("KVM: nSVM: synchronize VMCB controls updated by the processor on every vmexit"), as prior to that nested_svm_vmexit() always zeroed EVENTINJ fields. Explicitly clear the fields in all nested #VMEXIT code paths. Fixes: 3d6368ef580a ("KVM: SVM: Add VMRUN handler") Fixes: 2d8a42be0e2b ("KVM: nSVM: synchronize VMCB controls updated by the processor on every vmexit") Cc: stable@vger.kernel.org Signed-off-by: Yosry Ahmed Link: https://patch.msgid.link/20260303003421.2185681-12-yosry@kernel.org [sean: massage changelog formatting] Signed-off-by: Sean Christopherson diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index ac7d7f82c82b..90c8bc641bf3 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -1035,6 +1035,8 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu) vmcb12->control.exit_code = SVM_EXIT_ERR; vmcb12->control.exit_info_1 = 0; vmcb12->control.exit_info_2 = 0; + vmcb12->control.event_inj = 0; + vmcb12->control.event_inj_err = 0; svm_set_gif(svm, false); goto out; } @@ -1178,9 +1180,9 @@ static int nested_svm_vmexit_update_vmcb12(struct kvm_vcpu *vcpu) if (nested_vmcb12_has_lbrv(vcpu)) svm_copy_lbrs(&vmcb12->save, &vmcb02->save); + vmcb12->control.event_inj = 0; + vmcb12->control.event_inj_err = 0; vmcb12->control.int_ctl = svm->nested.ctl.int_ctl; - vmcb12->control.event_inj = svm->nested.ctl.event_inj; - vmcb12->control.event_inj_err = svm->nested.ctl.event_inj_err; trace_kvm_nested_vmexit_inject(vmcb12->control.exit_code, vmcb12->control.exit_info_1,