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From: Jim Mattson <jmattson@google.com>
To: Like Xu <like.xu.linux@gmail.com>
Cc: Sean Christopherson <seanjc@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Sandipan Das <sandipan.das@amd.com>
Subject: Re: [PATCH v2 2/3] KVM: x86/svm/pmu: Add AMD PerfMonV2 support
Date: Tue, 20 Sep 2022 17:06:47 -0700	[thread overview]
Message-ID: <CALMp9eTnAsi7xYDPkN02wK23ndH5mZxoTNj39uS1s05UdLeQVQ@mail.gmail.com> (raw)
In-Reply-To: <20220919093453.71737-3-likexu@tencent.com>

On Mon, Sep 19, 2022 at 2:35 AM Like Xu <like.xu.linux@gmail.com> wrote:
>
> From: Like Xu <likexu@tencent.com>
>
> If AMD Performance Monitoring Version 2 (PerfMonV2) is detected
> by the guest, it can use a new scheme to manage the Core PMCs using
> the new global control and status registers.
>
> In addition to benefiting from the PerfMonV2 functionality in the same
> way as the host (higher precision), the guest also can reduce the number
> of vm-exits by lowering the total number of MSRs accesses.
>
> In terms of implementation details, amd_is_valid_msr() is resurrected
> since three newly added MSRs could not be mapped to one vPMC.
> The possibility of emulating PerfMonV2 on the mainframe has also
> been eliminated for reasons of precision.
>
> Co-developed-by: Sandipan Das <sandipan.das@amd.com>
> Signed-off-by: Sandipan Das <sandipan.das@amd.com>
> Signed-off-by: Like Xu <likexu@tencent.com>
Reviewed-by: Jim Mattson <jmattson@google.com>

  reply	other threads:[~2022-09-21  0:07 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-19  9:34 [PATCH v2 0/3] KVM: x86: Add AMD Guest PerfMonV2 PMU support Like Xu
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 [this message]
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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