From: Jim Mattson <jmattson@google.com>
To: Zide Chen <zide.chen@intel.com>
Cc: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
kvm@vger.kernel.org, Yosry Ahmed <yosry@kernel.org>,
Andi Kleen <ak@linux.intel.com>,
Stephane Eranian <eranian@google.com>,
linux-kernel@vger.kernel.org, Mingwei Zhang <mizhang@google.com>,
Das Sandipan <Sandipan.Das@amd.com>,
Shukla Manali <Manali.Shukla@amd.com>,
Dapeng Mi <dapeng1.mi@linux.intel.com>,
Xudong Hao <xudong.hao@intel.com>
Subject: Re: [PATCH v3 17/18] KVM: x86/pmu: Advertise PerfMon version 5 on Intel hosts
Date: Fri, 6 Nov 2026 13:20:14 -0800 [thread overview]
Message-ID: <CALMp9eRAJfDSdxi72e0JS+jGvMGEPThwfo_VF-7Fbs3EmhcGjA@mail.gmail.com> (raw)
In-Reply-To: <20261106013927.166209-18-zide.chen@intel.com>
On Thu, Nov 5, 2026 at 5:50 PM Zide Chen <zide.chen@intel.com> wrote:
>
> From: Dapeng Mi <dapeng1.mi@linux.intel.com>
>
> KVM currently caps the guest PerfMon version at 2 for all Intel
> platforms. Now that KVM emulates the basic architectural PMU features
> introduced in PerfMon versions 3 through 5, raise the guest PerfMon
> version to 5. Features that require additional emulation support, e.g.
> architectural LBR will be enabled separately.
>
> PerfMon versions 3 and 4 continue to be exposed as version 2 because
> KVM cannot safely virtualize AnyThread due to cross-VM information
> leakage. PerfMon v5 is supported because it provides the
> AnyThread-deprecated capability, allowing KVM to indicate that
> AnyThread is deprecated.
>
> When enable_mediated_pmu is disabled or in the non-Intel paths, KVM
> retains the existing cap of version 2.
>
> Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
> Signed-off-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
next prev parent reply other threads:[~2026-11-06 21:20 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-06 1:39 [PATCH v3 00/18] KVM: x86/pmu: Add mediated vPMU PerfMon v5 support Zide Chen
2026-11-06 1:39 ` [PATCH v3 01/18] KVM: x86/pmu: Remove redundant Perf Global Status MSR bit definitions Zide Chen
2026-11-06 18:19 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 02/18] KVM: x86/pmu: Rename all_valid_pmc_idx to pmc_exists Zide Chen
2026-11-06 18:21 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 03/18] KVM: x86/pmu: Rename reserved_bits to eventsel_rsvd in kvm_pmu Zide Chen
2026-11-06 18:37 ` Yosry Ahmed
2026-11-06 21:16 ` Chen, Zide
2026-11-06 22:38 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 04/18] KVM: x86/pmu: Add PMC bitmap accessor helpers Zide Chen
2026-11-06 19:09 ` Yosry Ahmed
2026-11-06 22:19 ` Chen, Zide
2026-11-06 22:35 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 05/18] KVM: x86/pmu: Drop nr_arch_{gp,fixed}_counters from kvm_pmu Zide Chen
2026-11-06 19:34 ` Yosry Ahmed
2026-11-07 0:42 ` Jim Mattson
2026-11-06 1:39 ` [PATCH v3 06/18] KVM: x86/pmu: Expose kvm_host_pmu to vendor modules Zide Chen
2026-11-06 19:37 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 07/18] perf/x86: Plumb counter bitmap from x86_pmu to x86_pmu_cap Zide Chen
2026-11-06 1:39 ` [PATCH v3 08/18] KVM: x86/pmu: Switch to bitmask-based KVM PMU capabilities Zide Chen
2026-11-06 20:05 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 09/18] perf/x86: Remove num_counters_{gp,fixed} from x86_pmu_capability Zide Chen
2026-11-06 1:39 ` [PATCH v3 10/18] KVM: x86/pmu: Document GLOBAL_STATUS_RESET passthrough erratum Zide Chen
2026-11-06 20:14 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 11/18] KVM: x86/pmu: Emulate IA32_PERF_GLOBAL_STATUS_SET MSR Zide Chen
2026-11-06 20:35 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 12/18] KVM: x86/pmu: Emulate IA32_PERF_GLOBAL_INUSE MSR Zide Chen
2026-11-06 1:39 ` [PATCH v3 13/18] KVM: x86/pmu: Populate CPUID.0AH:ECX fixed-counter bitmap Zide Chen
2026-11-06 21:00 ` Yosry Ahmed
2026-11-06 1:39 ` [PATCH v3 14/18] KVM: x86/pmu: Factor out fixed counter control bit calculation Zide Chen
2026-11-06 1:39 ` [PATCH v3 15/18] KVM: x86/pmu: Mask only OS/USR bits when filtering fixed counters Zide Chen
2026-11-06 21:19 ` Jim Mattson
2026-11-06 1:39 ` [PATCH v3 16/18] KVM: x86/pmu: Ignore AnyThread bit if CPUID.0AH:EDX[15] is set Zide Chen
2026-11-06 1:39 ` [PATCH v3 17/18] KVM: x86/pmu: Advertise PerfMon version 5 on Intel hosts Zide Chen
2026-11-06 21:20 ` Jim Mattson [this message]
2026-11-06 1:39 ` [PATCH v3 18/18] KVM: selftests: Support fixed counters bitmap in pmu_counters_test Zide Chen
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