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a="73462339" X-IronPort-AV: E=Sophos;i="6.21,258,1763452800"; d="scan'208";a="73462339" X-CSE-ConnectionGUID: eFMJHCByREqk9Vkmu5E7eA== X-CSE-MsgGUID: baSQ/vM4SuSE2jwU1xiMYg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,258,1763452800"; d="scan'208";a="208001782" From: Zide Chen To: qemu-devel@nongnu.org, kvm@vger.kernel.org, Paolo Bonzini , Zhao Liu , Peter Xu , Fabiano Rosas Cc: Xiaoyao Li , Dongli Zhang , Dapeng Mi , Zide Chen Subject: [PATCH V2 08/11] target/i386: Clean up LBR format handling Date: Wed, 28 Jan 2026 15:09:45 -0800 Message-ID: <20260128231003.268981-9-zide.chen@intel.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260128231003.268981-1-zide.chen@intel.com> References: <20260128231003.268981-1-zide.chen@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.13; envelope-from=zide.chen@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1769642363820154100 Content-Type: text/plain; charset="utf-8" Since the lbr-fmt property is masked with PERF_CAP_LBR_FMT in DEFINE_PROP_UINT64_CHECKMASK(), there is no need to explicitly validate user-requested lbr-fmt values. The PMU feature is only supported when running under KVM, so initialize cpu->lbr_fmt in kvm_cpu_instance_init(). Use -1 as the default lbr-fmt, rather than initializing it with ~PERF_CAP_LBR_FMT, which is misleading as it suggests a semantic relationship that does not exist. Rename requested_lbr_fmt to a more generic guest_fmt. When lbr-fmt is not specified and cpu->migratable is false, the guest lbr_fmt value is not user-requested. Signed-off-by: Zide Chen --- V2: - New patch. target/i386/cpu.c | 18 ++++++------------ target/i386/kvm/kvm-cpu.c | 2 ++ 2 files changed, 8 insertions(+), 12 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index f2c83b4f259c..09180c718d58 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -9788,7 +9788,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error= **errp) X86CPUClass *xcc =3D X86_CPU_GET_CLASS(dev); CPUX86State *env =3D &cpu->env; Error *local_err =3D NULL; - unsigned requested_lbr_fmt; + unsigned guest_fmt; =20 if (!kvm_enabled()) cpu->enable_pmu =3D false; @@ -9828,11 +9828,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Erro= r **errp) * Override env->features[FEAT_PERF_CAPABILITIES].LBR_FMT * with user-provided setting. */ - if (cpu->lbr_fmt !=3D ~PERF_CAP_LBR_FMT) { - if ((cpu->lbr_fmt & PERF_CAP_LBR_FMT) !=3D cpu->lbr_fmt) { - error_setg(errp, "invalid lbr-fmt"); - return; - } + if (cpu->lbr_fmt !=3D -1) { env->features[FEAT_PERF_CAPABILITIES] &=3D ~PERF_CAP_LBR_FMT; env->features[FEAT_PERF_CAPABILITIES] |=3D cpu->lbr_fmt; } @@ -9841,9 +9837,8 @@ static void x86_cpu_realizefn(DeviceState *dev, Error= **errp) * vPMU LBR is supported when 1) KVM is enabled 2) Option pmu=3Don and * 3)vPMU LBR format matches that of host setting. */ - requested_lbr_fmt =3D - env->features[FEAT_PERF_CAPABILITIES] & PERF_CAP_LBR_FMT; - if (requested_lbr_fmt && kvm_enabled()) { + guest_fmt =3D env->features[FEAT_PERF_CAPABILITIES] & PERF_CAP_LBR_FMT; + if (guest_fmt) { uint64_t host_perf_cap =3D x86_cpu_get_supported_feature_word(NULL, FEAT_PERF_CAPABILITIE= S); unsigned host_lbr_fmt =3D host_perf_cap & PERF_CAP_LBR_FMT; @@ -9852,10 +9847,10 @@ static void x86_cpu_realizefn(DeviceState *dev, Err= or **errp) error_setg(errp, "vPMU: LBR is unsupported without pmu=3Don"); return; } - if (requested_lbr_fmt !=3D host_lbr_fmt) { + if (guest_fmt !=3D host_lbr_fmt) { error_setg(errp, "vPMU: the lbr-fmt value (0x%x) does not matc= h " "the host value (0x%x).", - requested_lbr_fmt, host_lbr_fmt); + guest_fmt, host_lbr_fmt); return; } } @@ -10279,7 +10274,6 @@ static void x86_cpu_initfn(Object *obj) object_property_add_alias(obj, "sse4_2", obj, "sse4.2"); =20 object_property_add_alias(obj, "hv-apicv", obj, "hv-avic"); - cpu->lbr_fmt =3D ~PERF_CAP_LBR_FMT; object_property_add_alias(obj, "lbr_fmt", obj, "lbr-fmt"); =20 if (xcc->model) { diff --git a/target/i386/kvm/kvm-cpu.c b/target/i386/kvm/kvm-cpu.c index 33a8c26bc27c..b4500ab69f82 100644 --- a/target/i386/kvm/kvm-cpu.c +++ b/target/i386/kvm/kvm-cpu.c @@ -231,6 +231,8 @@ static void kvm_cpu_instance_init(CPUState *cs) kvm_cpu_max_instance_init(cpu); } =20 + cpu->lbr_fmt =3D -1; + kvm_cpu_xsave_init(); } =20 --=20 2.52.0