From: "Wang, Wei W" <wei.w.wang@intel.com>
To: "Zhu, Lingshan" <lingshan.zhu@intel.com>,
Liuxiangdong <liuxiangdong5@huawei.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>
Cc: "bp@alien8.de" <bp@alien8.de>,
"seanjc@google.com" <seanjc@google.com>,
"vkuznets@redhat.com" <vkuznets@redhat.com>,
"wanpengli@tencent.com" <wanpengli@tencent.com>,
"jmattson@google.com" <jmattson@google.com>,
"joro@8bytes.org" <joro@8bytes.org>,
"Yang, Weijiang" <weijiang.yang@intel.com>,
"kan.liang@linux.intel.com" <kan.liang@linux.intel.com>,
"ak@linux.intel.com" <ak@linux.intel.com>,
"eranian@google.com" <eranian@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"like.xu.linux@gmail.com" <like.xu.linux@gmail.com>,
"Fangyi (Eric)" <eric.fangyi@huawei.com>,
Xiexiangyou <xiexiangyou@huawei.com>
Subject: RE: [PATCH V7 00/18] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS
Date: Mon, 28 Jun 2021 07:49:38 +0000 [thread overview]
Message-ID: <81530ac3ebe74ada9b5d1dc8092c1a31@intel.com> (raw)
In-Reply-To: <37832cc0-788d-91b9-dc95-147eca133842@intel.com>
On Friday, June 25, 2021 5:46 PM, Zhu, Lingshan wrote:
> > Only on the host?
> > I cannot use pebs unless try with "echo 0 > /proc/sys/kernel/watchdog"
> > both on the host and guest on ICX.
> Hi Xiangdong
>
> I guess you may run into the "cross-map" case(slow path below), so I think you
> can disable them both in host and guest to make PEBS work.
>
Hi Lingshan, could we also reproduce this issue?
If the guest's watchdog takes away the virtual fixed counter, this will schedule the guest PEBS to use virtual PMC0. With the fast path (1:1 mapping), I think physical PMC0 is likely to be available for the guest PEBS emulation if no other host perf events are running.
Best,
Wei
next prev parent reply other threads:[~2021-06-28 7:49 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-22 9:42 [PATCH V7 00/18] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 01/18] perf/core: Use static_call to optimize perf_guest_info_callbacks Zhu Lingshan
2021-07-02 11:22 ` Peter Zijlstra
2021-07-02 16:00 ` Joe Perches
2021-07-02 16:19 ` Peter Zijlstra
2021-07-02 16:42 ` Joe Perches
2021-07-02 16:38 ` Mark Rutland
2021-07-02 16:56 ` Joe Perches
2021-07-08 8:53 ` Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 02/18] perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 03/18] perf/x86/intel: Handle guest PEBS overflow PMI for KVM guest Zhu Lingshan
2021-07-02 11:28 ` Peter Zijlstra
2021-07-08 13:39 ` Zhu, Lingshan
2021-06-22 9:42 ` [PATCH V7 04/18] perf/x86/core: Pass "struct kvm_pmu *" to determine the guest values Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 05/18] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 06/18] KVM: x86/pmu: Introduce the ctrl_mask value for fixed counter Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 07/18] x86/perf/core: Add pebs_capable to store valid PEBS_COUNTER_MASK value Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 08/18] KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 09/18] KVM: x86/pmu: Reprogram PEBS event to emulate guest PEBS counter Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 10/18] KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter Zhu Lingshan
2021-06-22 9:42 ` [PATCH V7 11/18] KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS Zhu Lingshan
2021-07-02 11:52 ` Peter Zijlstra
2021-07-08 8:52 ` Zhu, Lingshan
2021-06-22 9:43 ` [PATCH V7 12/18] KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS Zhu Lingshan
2021-06-22 9:43 ` [PATCH V7 13/18] KVM: x86: Set PEBS_UNAVAIL in IA32_MISC_ENABLE when PEBS is enabled Zhu Lingshan
2021-06-22 9:43 ` [PATCH V7 14/18] KVM: x86/pmu: Move pmc_speculative_in_use() to arch/x86/kvm/pmu.h Zhu Lingshan
2021-06-22 9:43 ` [PATCH V7 15/18] KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations Zhu Lingshan
2021-07-02 12:46 ` Peter Zijlstra
2021-07-08 8:52 ` Zhu, Lingshan
2021-06-22 9:43 ` [PATCH V7 16/18] KVM: x86/pmu: Add kvm_pmu_cap to optimize perf_get_x86_pmu_capability Zhu Lingshan
2021-06-22 9:43 ` [PATCH V7 17/18] KVM: x86/cpuid: Refactor host/guest CPU model consistency check Zhu Lingshan
2021-06-22 9:43 ` [PATCH V7 18/18] KVM: x86/pmu: Expose CPUIDs feature bits PDCM, DS, DTES64 Zhu Lingshan
2021-06-25 9:40 ` [PATCH V7 00/18] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS Liuxiangdong
2021-06-25 9:46 ` Zhu, Lingshan
2021-06-28 7:49 ` Wang, Wei W [this message]
2021-06-28 7:53 ` Zhu, Lingshan
2021-07-02 12:49 ` Peter Zijlstra
2021-07-12 1:37 ` Liuxiangdong
2021-07-12 10:34 ` Like Xu
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