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From: "Xu, Like" <like.xu@intel.com>
To: Alex Shi <alex.shi@linux.alibaba.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>
Cc: Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, "H . Peter Anvin" <hpa@zytor.com>,
	ak@linux.intel.com, wei.w.wang@intel.com, kan.liang@intel.com,
	x86@kernel.org, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, Joerg Roedel <joro@8bytes.org>,
	Jim Mattson <jmattson@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Like Xu <like.xu@linux.intel.com>
Subject: Re: [RESEND v13 00/10] KVM: x86/pmu: Guest Last Branch Recording Enabling
Date: Fri, 15 Jan 2021 16:51:01 +0800	[thread overview]
Message-ID: <307385ae-cd3e-8d06-ffa9-dcd297ec9a8a@intel.com> (raw)
In-Reply-To: <3deac361-05fa-60a5-0d88-4f6b968f10bf@linux.alibaba.com>

Hi Alex,

Thank you for trying this guest feature on multiple Intel platforms!
If you have more specific comments or any concerns, just let me know.

---
thx, likexu

On 2021/1/15 16:19, Alex Shi wrote:
>
> 在 2021/1/8 上午9:36, Like Xu 写道:
>> Because saving/restoring tens of LBR MSRs (e.g. 32 LBR stack entries) in
>> VMX transition brings too excessive overhead to frequent vmx transition
>> itself, the guest LBR event would help save/restore the LBR stack msrs
>> during the context switching with the help of native LBR event callstack
>> mechanism, including LBR_SELECT msr.
>>
> Sounds the feature is much helpful for VMM guest performance tunning.
> Good job!
>
> Thanks
> Alex


      reply	other threads:[~2021-01-15  8:52 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-08  1:36 [RESEND v13 00/10] KVM: x86/pmu: Guest Last Branch Recording Enabling Like Xu
2021-01-08  1:36 ` [RESEND v13 01/10] KVM: x86: Move common set/get handler of MSR_IA32_DEBUGCTLMSR to VMX Like Xu
2021-01-26  9:25   ` Paolo Bonzini
2021-01-08  1:36 ` [RESEND v13 02/10] KVM: x86/vmx: Make vmx_set_intercept_for_msr() non-static Like Xu
2021-01-08  1:36 ` [RESEND v13 03/10] KVM: x86/pmu: Use IA32_PERF_CAPABILITIES to adjust features visibility Like Xu
2021-01-26  9:42   ` Paolo Bonzini
2021-01-27  6:04     ` Like Xu
2021-01-27  9:48       ` Paolo Bonzini
2021-02-01  5:28       ` Like Xu
2021-01-08  1:36 ` [RESEND v13 04/10] KVM: vmx/pmu: Clear PMU_CAP_LBR_FMT when guest LBR is disabled Like Xu
2021-01-08  1:36 ` [RESEND v13 05/10] KVM: vmx/pmu: Create a guest LBR event when vcpu sets DEBUGCTLMSR_LBR Like Xu
2021-01-08  1:37 ` [RESEND v13 06/10] KVM: vmx/pmu: Pass-through LBR msrs when the guest LBR event is ACTIVE Like Xu
2021-01-08  1:37 ` [RESEND v13 07/10] KVM: vmx/pmu: Reduce the overhead of LBR pass-through or cancellation Like Xu
2021-01-26  9:27   ` Paolo Bonzini
2021-01-08  1:37 ` [RESEND v13 08/10] KVM: vmx/pmu: Emulate legacy freezing LBRs on virtual PMI Like Xu
2021-01-08  1:37 ` [RESEND v13 09/10] KVM: vmx/pmu: Expose LBR_FMT in the MSR_IA32_PERF_CAPABILITIES Like Xu
2021-01-26  9:30   ` Paolo Bonzini
2021-01-27  5:45     ` Xu, Like
2021-01-27  9:49       ` Paolo Bonzini
2021-01-08  1:37 ` [RESEND v13 10/10] KVM: vmx/pmu: Release guest LBR event via lazy release mechanism Like Xu
2021-01-26  9:33   ` Paolo Bonzini
2021-01-15  8:19 ` [RESEND v13 00/10] KVM: x86/pmu: Guest Last Branch Recording Enabling Alex Shi
2021-01-15  8:51   ` Xu, Like [this message]

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