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 72D8931ED8E for ; Mon, 29 Dec 2025 14:28:39 +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=1767018519; cv=none; b=qzgA26rtNOzF+oucm/4OQA3EEHkAevM+XiJHoaE1ocW304qL2pQzuI/z9HbG9wcFz54ezgKH2Ta1q4AR1QdyC/KVmBHMP1FPu84HN+Y0jDlAo8gFqkuM3inz9RVkgjNHrMZ6myqbCSuvGiKfPnbLPBcihSIirnxUZTBkiDTrPSU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767018519; c=relaxed/simple; bh=x3S2NLaUfMipJnuXvlvQLPotT7Q4AwBR2+FBjLu+0G0=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=NMDb/BTC0TtU6TWaUVaTou/DqObBelzPXZsDOeiJE2AxVZeDCT84XYHT336COGpwDQ8zKzHomMAYpmDAP7UVPAk6nrAVLTP1M88lLGYZNI/aLnNW8vsi/ADCW/tED0Mb5A/6UoIqZdQc5jt/xy9UUWDu6l8oM0Vjs4GN9K+7jhA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=181gutbo; 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="181gutbo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9BF5CC4CEF7; Mon, 29 Dec 2025 14:28:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767018518; bh=x3S2NLaUfMipJnuXvlvQLPotT7Q4AwBR2+FBjLu+0G0=; h=Subject:To:Cc:From:Date:From; b=181gutboCdS1c/7rS1W5vdzVfIdxQdsrSONoWsCtOKaNTxj7JfkVtGKuYY7NYSF+1 HC04M2MydIC+DXoU6xYxro0Bi5+k8DBqRGzGI6RQD5Fd0unK0zkylLvAH2NDY2x4/W YLVHjQpGfMr+RQGzK2ZmMFZKWbA/CV3bVFJFt5p4= Subject: FAILED: patch "[PATCH] KVM: nVMX: Immediately refresh APICv controls as needed on" failed to apply to 5.15-stable tree To: dongli.zhang@oracle.com,chao.gao@intel.com,seanjc@google.com Cc: From: Date: Mon, 29 Dec 2025 15:28:27 +0100 Message-ID: <2025122927-delegate-composed-5765@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 29763138830916f46daaa50e83e7f4f907a3236b # git commit -s git send-email --to '' --in-reply-to '2025122927-delegate-composed-5765@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 29763138830916f46daaa50e83e7f4f907a3236b Mon Sep 17 00:00:00 2001 From: Dongli Zhang Date: Fri, 5 Dec 2025 15:19:05 -0800 Subject: [PATCH] KVM: nVMX: Immediately refresh APICv controls as needed on nested VM-Exit If an APICv status updated was pended while L2 was active, immediately refresh vmcs01's controls instead of pending KVM_REQ_APICV_UPDATE as kvm_vcpu_update_apicv() only calls into vendor code if a change is necessary. E.g. if APICv is inhibited, and then activated while L2 is running: kvm_vcpu_update_apicv() | -> __kvm_vcpu_update_apicv() | -> apic->apicv_active = true | -> vmx_refresh_apicv_exec_ctrl() | -> vmx->nested.update_vmcs01_apicv_status = true | -> return Then L2 exits to L1: __nested_vmx_vmexit() | -> kvm_make_request(KVM_REQ_APICV_UPDATE) vcpu_enter_guest(): KVM_REQ_APICV_UPDATE -> kvm_vcpu_update_apicv() | -> __kvm_vcpu_update_apicv() | -> return // because if (apic->apicv_active == activate) Reported-by: Chao Gao Closes: https://lore.kernel.org/all/aQ2jmnN8wUYVEawF@intel.com Fixes: 7c69661e225c ("KVM: nVMX: Defer APICv updates while L2 is active until L1 is active") Cc: stable@vger.kernel.org Signed-off-by: Dongli Zhang [sean: write changelog] Link: https://patch.msgid.link/20251205231913.441872-3-seanjc@google.com Signed-off-by: Sean Christopherson diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index bcea087b642f..1725c6a94f99 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -19,6 +19,7 @@ #include "trace.h" #include "vmx.h" #include "smm.h" +#include "x86_ops.h" static bool __read_mostly enable_shadow_vmcs = 1; module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO); @@ -5216,7 +5217,7 @@ void __nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason, if (vmx->nested.update_vmcs01_apicv_status) { vmx->nested.update_vmcs01_apicv_status = false; - kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu); + vmx_refresh_apicv_exec_ctrl(vcpu); } if (vmx->nested.update_vmcs01_hwapic_isr) {