From: Like Xu <like.xu.linux@gmail.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: Jim Mattson <jmattson@google.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 0/3] KVM: x86: Add AMD Guest PerfMonV2 PMU support
Date: Mon, 19 Sep 2022 17:34:50 +0800 [thread overview]
Message-ID: <20220919093453.71737-1-likexu@tencent.com> (raw)
Starting with Zen4, core PMU on AMD platforms such as Genoa and
Ryzen-7000 will support PerfMonV2, and it is also compatible with
legacy PERFCTR_CORE behavior and msr addresses.
If you don't have access to the hardware specification, the commits
d6d0c7f681fd..7685665c390d for host perf can also bring a quick
overview. Its main change is the addition of three msr's equivalent
to Intel V2, namely global_ctrl, global_status, global_status_clear.
It is worth noting that this feature is very attractive for reducing the
overhead of PMU virtualization, since multiple msr accesses to multiple
counters will be replaced by a single access to the global register,
plus more accuracy gain when multiple guest counters are used.
The KVM part is based on the latest vPMU fixes patch set [1], while
the kvm-unit-test patch has been move to the preemptive test cases
effort [2] for testing leagcy AMD vPMU, which didn't exist before.
All related testcases are passed on a Genoa box.
Please feel free to run more tests, add more or share comments.
[1] https://lore.kernel.org/kvm/20220831085328.45489-1-likexu@tencent.com/
[2] https://lore.kernel.org/kvm/20220819110939.78013-1-likexu@tencent.com/
Previous:
https://lore.kernel.org/kvm/20220905123946.95223-1-likexu@tencent.com/
V1 -> V2 Changelog:
- The patch limiting the x86 GP counters is moved to specific patch set;
- MSR scope is bounded by pmu->nr_arch_gp_counters (Jim);
- Fn8000_0022_EBX can never report less than four counters \
(or six, if Fn8000_0001_ECX[PerfCtrExtCore] is set); (Jim)
- Use "kvm_pmu_cap.version > 1" check instead of "guest perfmon_v2 bit";
Like Xu (2):
KVM: x86/pmu: Make part of the Intel v2 PMU MSRs handling x86 generic
KVM: x86/svm/pmu: Add AMD PerfMonV2 support
Sandipan Das (1):
KVM: x86/cpuid: Add AMD CPUID ExtPerfMonAndDbg leaf 0x80000022
arch/x86/include/asm/kvm-x86-pmu-ops.h | 1 -
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/include/asm/perf_event.h | 8 +++
arch/x86/kvm/cpuid.c | 32 ++++++++++-
arch/x86/kvm/pmu.c | 61 +++++++++++++++++++--
arch/x86/kvm/pmu.h | 30 +++++++++-
arch/x86/kvm/svm/pmu.c | 76 +++++++++++++++++++-------
arch/x86/kvm/vmx/pmu_intel.c | 58 +-------------------
arch/x86/kvm/x86.c | 14 ++++-
9 files changed, 193 insertions(+), 88 deletions(-)
--
2.37.3
next reply other threads:[~2022-09-19 9:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-19 9:34 Like Xu [this message]
2022-09-19 9:34 ` [PATCH v2 1/3] KVM: x86/pmu: Make part of the Intel v2 PMU MSRs handling x86 generic Like Xu
2022-09-22 0:20 ` Jim Mattson
2022-09-22 5:47 ` Like Xu
2022-09-22 6:20 ` Like Xu
2022-10-27 22:14 ` Sean Christopherson
2022-10-07 22:19 ` Sean Christopherson
2022-10-27 22:10 ` Sean Christopherson
2022-09-19 9:34 ` [PATCH v2 2/3] KVM: x86/svm/pmu: Add AMD PerfMonV2 support Like Xu
2022-09-21 0:06 ` Jim Mattson
2022-10-27 22:47 ` Sean Christopherson
2022-11-09 9:54 ` Like Xu
2022-11-09 14:51 ` Sean Christopherson
2022-09-19 9:34 ` [PATCH v2 3/3] KVM: x86/cpuid: Add AMD CPUID ExtPerfMonAndDbg leaf 0x80000022 Like Xu
2022-09-21 0:02 ` Jim Mattson
2022-10-27 22:37 ` Sean Christopherson
2022-11-10 9:26 ` Like Xu
2022-11-10 17:34 ` Sean Christopherson
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