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Mon, 29 Apr 2024 15:57:42 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3xrqt6j95m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 29 Apr 2024 15:57:42 +0000 Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 43TFuxjM040299; Mon, 29 Apr 2024 15:57:42 GMT Received: from alaljime-dev-e4flex-vm.osdevelopmeniad.oraclevcn.com (alaljime-dev-e4flex-vm.allregionaliads.osdevelopmeniad.oraclevcn.com [100.100.249.106]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 3xrqt6j91w-2; Mon, 29 Apr 2024 15:57:42 +0000 From: Alejandro Jimenez To: kvm@vger.kernel.org Cc: seanjc@google.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, suravee.suthikulpanit@amd.com, vashegde@amd.com, mlevitsk@redhat.com, joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, mark.kanda@oracle.com, alejandro.j.jimenez@oracle.com Subject: [PATCH 1/4] KVM: x86: Expose per-vCPU APICv status Date: Mon, 29 Apr 2024 15:57:35 +0000 Message-Id: <20240429155738.990025-2-alejandro.j.jimenez@oracle.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20240429155738.990025-1-alejandro.j.jimenez@oracle.com> References: <20240429155738.990025-1-alejandro.j.jimenez@oracle.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1011,Hydra:6.0.650,FMLib:17.11.176.26 definitions=2024-04-29_14,2024-04-29_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 malwarescore=0 adultscore=0 mlxscore=0 suspectscore=0 phishscore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2404010000 definitions=main-2404290101 X-Proofpoint-GUID: faF3Eo7RghRW60RkookFeY1oCaAqZqld X-Proofpoint-ORIG-GUID: faF3Eo7RghRW60RkookFeY1oCaAqZqld Expose the APICv activation status of individual vCPUs via the stats subsystem. In special cases a vCPU's APICv can be deactivated/disabled even though there are no VM-wide inhibition reasons. The only current example of this is AVIC for a vCPU running in nested mode. This type of inhibition is not recorded in the VM inhibit reasons or visible in current tracepoints. Signed-off-by: Alejandro Jimenez Reviewed-by: Vasant Hegde --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/lapic.c | 1 + arch/x86/kvm/x86.c | 2 ++ 3 files changed, 4 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 1d13e3cd1dc5..12f30cb5c842 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1573,6 +1573,7 @@ struct kvm_vcpu_stat { u64 preemption_other; u64 guest_mode; u64 notify_window_exits; + u64 apicv_active; }; struct x86_instruction_info; diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index cf37586f0466..37fe75a5db8c 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2872,6 +2872,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu, int timer_advance_ns) */ if (enable_apicv) { apic->apicv_active = true; + vcpu->stat.apicv_active = apic->apicv_active; kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu); } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index e9ef1fa4b90b..0451c4c8d731 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -304,6 +304,7 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = { STATS_DESC_COUNTER(VCPU, preemption_other), STATS_DESC_IBOOLEAN(VCPU, guest_mode), STATS_DESC_COUNTER(VCPU, notify_window_exits), + STATS_DESC_IBOOLEAN(VCPU, apicv_active), }; const struct kvm_stats_header kvm_vcpu_stats_header = { @@ -10625,6 +10626,7 @@ void __kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu) goto out; apic->apicv_active = activate; + vcpu->stat.apicv_active = apic->apicv_active; kvm_apic_update_apicv(vcpu); static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu);