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Mon, 29 Dec 2025 15:57:23 -0800 (PST) Date: Mon, 29 Dec 2025 15:57:21 -0800 In-Reply-To: <43d1cde6-2277-4f3c-8e7d-59e6edb2228a@linux.intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251206001720.468579-1-seanjc@google.com> <20251206001720.468579-16-seanjc@google.com> <43d1cde6-2277-4f3c-8e7d-59e6edb2228a@linux.intel.com> Message-ID: Subject: Re: [PATCH v6 15/44] KVM: x86/pmu: Snapshot host (i.e. perf's) reported PMU capabilities From: Sean Christopherson To: Dapeng Mi Cc: Marc Zyngier , Oliver Upton , Tianrui Zhao , Bibo Mao , Huacai Chen , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Xin Li , "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Paolo Bonzini , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, loongarch@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Mingwei Zhang , Xudong Hao , Sandipan Das , Xiong Zhang , Manali Shukla , Jim Mattson Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Thu, Dec 25, 2025, Dapeng Mi wrote: >=20 > On 12/6/2025 8:16 AM, Sean Christopherson wrote: > > Take a snapshot of the unadulterated PMU capabilities provided by perf = so > > that KVM can compare guest vPMU capabilities against hardware capabilit= ies > > when determining whether or not to intercept PMU MSRs (and RDPMC). > > > > Reviewed-by: Sandipan Das > > Tested-by: Xudong Hao > > Signed-off-by: Sean Christopherson > > --- > > arch/x86/kvm/pmu.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c > > index 487ad19a236e..7c219305b61d 100644 > > --- a/arch/x86/kvm/pmu.c > > +++ b/arch/x86/kvm/pmu.c > > @@ -108,6 +108,8 @@ void kvm_init_pmu_capability(const struct kvm_pmu_o= ps *pmu_ops) > > bool is_intel =3D boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_INTEL; > > int min_nr_gp_ctrs =3D pmu_ops->MIN_NR_GP_COUNTERS; > > =20 > > + perf_get_x86_pmu_capability(&kvm_host_pmu); > > + > > /* > > * Hybrid PMUs don't play nice with virtualization without careful > > * configuration by userspace, and KVM's APIs for reporting supported >=20 > Hi Sean, >=20 > It looks a merging error here. We don't need this patch. Gah, right you are. I overlooked it because it didn't conflict on a rebase= , and I once again forgot to test on a hybrid PMU, grr. Thanks! > The original patch "51f34b1 ("KVM: x86/pmu: Snapshot host (i.e. perf's) > reported PMU capabilities")" had been merged into upstream and subsequent= ly > we submitted a new patch "034417c1439a ("KVM: x86/pmu: Don't try to get > perf capabilities for hybrid CPUs")" to fix the warning introduced from > previous patch=C2=A0 "51f34b1 ("KVM: x86/pmu: Snapshot host (i.e. perf's) > reported PMU capabilities")". 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Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Paolo Bonzini , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, loongarch@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Mingwei Zhang , Xudong Hao , Sandipan Das , Xiong Zhang , Manali Shukla , Jim Mattson X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251229_155725_048929_7CF953CB X-CRM114-Status: GOOD ( 19.94 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVGh1LCBEZWMgMjUsIDIwMjUsIERhcGVuZyBNaSB3cm90ZToKPiAKPiBPbiAxMi82LzIwMjUg ODoxNiBBTSwgU2VhbiBDaHJpc3RvcGhlcnNvbiB3cm90ZToKPiA+IFRha2UgYSBzbmFwc2hvdCBv ZiB0aGUgdW5hZHVsdGVyYXRlZCBQTVUgY2FwYWJpbGl0aWVzIHByb3ZpZGVkIGJ5IHBlcmYgc28K PiA+IHRoYXQgS1ZNIGNhbiBjb21wYXJlIGd1ZXN0IHZQTVUgY2FwYWJpbGl0aWVzIGFnYWluc3Qg aGFyZHdhcmUgY2FwYWJpbGl0aWVzCj4gPiB3aGVuIGRldGVybWluaW5nIHdoZXRoZXIgb3Igbm90 IHRvIGludGVyY2VwdCBQTVUgTVNScyAoYW5kIFJEUE1DKS4KPiA+Cj4gPiBSZXZpZXdlZC1ieTog U2FuZGlwYW4gRGFzIDxzYW5kaXBhbi5kYXNAYW1kLmNvbT4KPiA+IFRlc3RlZC1ieTogWHVkb25n IEhhbyA8eHVkb25nLmhhb0BpbnRlbC5jb20+Cj4gPiBTaWduZWQtb2ZmLWJ5OiBTZWFuIENocmlz dG9waGVyc29uIDxzZWFuamNAZ29vZ2xlLmNvbT4KPiA+IC0tLQo+ID4gIGFyY2gveDg2L2t2bS9w bXUuYyB8IDIgKysKPiA+ICAxIGZpbGUgY2hhbmdlZCwgMiBpbnNlcnRpb25zKCspCj4gPgo+ID4g ZGlmZiAtLWdpdCBhL2FyY2gveDg2L2t2bS9wbXUuYyBiL2FyY2gveDg2L2t2bS9wbXUuYwo+ID4g aW5kZXggNDg3YWQxOWEyMzZlLi43YzIxOTMwNWI2MWQgMTAwNjQ0Cj4gPiAtLS0gYS9hcmNoL3g4 Ni9rdm0vcG11LmMKPiA+ICsrKyBiL2FyY2gveDg2L2t2bS9wbXUuYwo+ID4gQEAgLTEwOCw2ICsx MDgsOCBAQCB2b2lkIGt2bV9pbml0X3BtdV9jYXBhYmlsaXR5KGNvbnN0IHN0cnVjdCBrdm1fcG11 X29wcyAqcG11X29wcykKPiA+ICAJYm9vbCBpc19pbnRlbCA9IGJvb3RfY3B1X2RhdGEueDg2X3Zl bmRvciA9PSBYODZfVkVORE9SX0lOVEVMOwo+ID4gIAlpbnQgbWluX25yX2dwX2N0cnMgPSBwbXVf b3BzLT5NSU5fTlJfR1BfQ09VTlRFUlM7Cj4gPiAgCj4gPiArCXBlcmZfZ2V0X3g4Nl9wbXVfY2Fw YWJpbGl0eSgma3ZtX2hvc3RfcG11KTsKPiA+ICsKPiA+ICAJLyoKPiA+ICAJICogSHlicmlkIFBN VXMgZG9uJ3QgcGxheSBuaWNlIHdpdGggdmlydHVhbGl6YXRpb24gd2l0aG91dCBjYXJlZnVsCj4g PiAgCSAqIGNvbmZpZ3VyYXRpb24gYnkgdXNlcnNwYWNlLCBhbmQgS1ZNJ3MgQVBJcyBmb3IgcmVw b3J0aW5nIHN1cHBvcnRlZAo+IAo+IEhpIFNlYW4sCj4gCj4gSXQgbG9va3MgYSBtZXJnaW5nIGVy cm9yIGhlcmUuIFdlIGRvbid0IG5lZWQgdGhpcyBwYXRjaC4KCkdhaCwgcmlnaHQgeW91IGFyZS4g IEkgb3Zlcmxvb2tlZCBpdCBiZWNhdXNlIGl0IGRpZG4ndCBjb25mbGljdCBvbiBhIHJlYmFzZSwg YW5kCkkgb25jZSBhZ2FpbiBmb3Jnb3QgdG8gdGVzdCBvbiBhIGh5YnJpZCBQTVUsIGdyci4KClRo YW5rcyEKCj4gVGhlIG9yaWdpbmFsIHBhdGNoICI1MWYzNGIxICgiS1ZNOiB4ODYvcG11OiBTbmFw c2hvdCBob3N0IChpLmUuIHBlcmYncykKPiByZXBvcnRlZCBQTVUgY2FwYWJpbGl0aWVzIikiIGhh ZCBiZWVuIG1lcmdlZCBpbnRvIHVwc3RyZWFtIGFuZCBzdWJzZXF1ZW50bHkKPiB3ZSBzdWJtaXR0 ZWQgYSBuZXcgcGF0Y2ggIjAzNDQxN2MxNDM5YSAoIktWTTogeDg2L3BtdTogRG9uJ3QgdHJ5IHRv IGdldAo+IHBlcmYgY2FwYWJpbGl0aWVzIGZvciBoeWJyaWQgQ1BVcyIpIiB0byBmaXggdGhlIHdh cm5pbmcgaW50cm9kdWNlZCBmcm9tCj4gcHJldmlvdXMgcGF0Y2jCoCAiNTFmMzRiMSAoIktWTTog eDg2L3BtdTogU25hcHNob3QgaG9zdCAoaS5lLiBwZXJmJ3MpCj4gcmVwb3J0ZWQgUE1VIGNhcGFi aWxpdGllcyIpIi4gVGhhbmtzLgo+IAo+IC1EYXBlbmcgTWkKPiAKPiAKCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlz dApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQu b3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK