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Mon, 4 Nov 2024 09:42:05 GMT Received: from localhost.localdomain (ca-dev80.us.oracle.com [10.211.9.80]) by iadpaimrmta03.imrmtpd1.prodappiadaev1.oraclevcn.com (PPS) with ESMTP id 42nahbt06k-8; Mon, 04 Nov 2024 09:42:04 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=corp-2023-11-20; bh=Mtp7c F2I5l+mbvT9VpcvvHwkRan/n1Y5vkihKlaMSj8=; b=eO4YEgkTJt/vUl+KFvawb Zqn141sWKxt2CWtY6q/lhve6vKPipqDgRVEVAwhY1CiRmhELErXnHWuUa8rltHrl RwUprTlhNgpeSmewqV1JCkPHYv2WVFvqZF1mdIb+rUW7rDDKbysPLf66qOkqqGU9 M83qxVLEmRBijKpz3+RojPsDKS+qpnqfv71uMIvZ93PzKzHgwX2toBbge3VX1W5j KbjFRIYpDVCVgG8r+gdXCkUAjhpg1gIIi3JCc2FTGSJSH4x0vkhyRsWR9nPh1uhv kZVzI+PH5cpI2rHvH/7hFdbvS+PDOGQtOzjh6NMwaShHNhU9U2x//Z6b2okWIKGL g== From: Dongli Zhang To: qemu-devel@nongnu.org, kvm@vger.kernel.org Cc: pbonzini@redhat.com, mtosatti@redhat.com, sandipan.das@amd.com, babu.moger@amd.com, zhao1.liu@intel.com, likexu@tencent.com, like.xu.linux@gmail.com, zhenyuw@linux.intel.com, groug@kaod.org, lyan@digitalocean.com, khorenko@virtuozzo.com, alexander.ivanov@virtuozzo.com, den@virtuozzo.com, joe.jin@oracle.com, davydov-max@yandex-team.ru Subject: [PATCH 7/7] target/i386/kvm: don't stop Intel PMU counters Date: Mon, 4 Nov 2024 01:40:22 -0800 Message-ID: <20241104094119.4131-8-dongli.zhang@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241104094119.4131-1-dongli.zhang@oracle.com> References: <20241104094119.4131-1-dongli.zhang@oracle.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-04_07,2024-11-01_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 mlxlogscore=999 mlxscore=0 suspectscore=0 bulkscore=0 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2409260000 definitions=main-2411040085 X-Proofpoint-ORIG-GUID: 6e8ieF02pb_kFg_RZwb-GTQwlJliHIY0 X-Proofpoint-GUID: 6e8ieF02pb_kFg_RZwb-GTQwlJliHIY0 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" The kvm_put_msrs() sets the MSRs using KVM_SET_MSRS. The x86 KVM processes these MSRs one by one in a loop, only saving the config and triggering the KVM_REQ_PMU request. This approach does not immediately stop the event before updating PMC. In additional, PMU MSRs are set only at levels >=3D KVM_PUT_RESET_STATE, excluding runtime. Therefore, updating these MSRs without stopping events should be acceptable. Finally, KVM creates kernel perf events with host mode excluded (exclude_host =3D 1). While the events remain active, they don't increment the counter during QEMU vCPU userspace mode. No Fixed tag is going to be added for the commit 0d89436786b0 ("kvm: migrate vPMU state"), because this isn't a bugfix. Signed-off-by: Dongli Zhang --- target/i386/kvm/kvm.c | 9 --------- 1 file changed, 9 deletions(-) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 918dcb61fe..c4a11c2e80 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -4111,13 +4111,6 @@ static int kvm_put_msrs(X86CPU *cpu, int level) } =20 if (IS_INTEL_CPU(env) && has_pmu_version > 0) { - if (has_pmu_version > 1) { - /* Stop the counter. */ - kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR_CTRL, 0); - kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_CTRL, 0); - } - - /* Set the counter values. */ for (i =3D 0; i < num_pmu_fixed_counters; i++) { kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR0 + i, env->msr_fixed_counters[i]); @@ -4133,8 +4126,6 @@ static int kvm_put_msrs(X86CPU *cpu, int level) env->msr_global_status); kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_OVF_CTRL, env->msr_global_ovf_ctrl); - - /* Now start the PMU. */ kvm_msr_entry_add(cpu, MSR_CORE_PERF_FIXED_CTR_CTRL, env->msr_fixed_ctr_ctrl); kvm_msr_entry_add(cpu, MSR_CORE_PERF_GLOBAL_CTRL, --=20 2.39.3