From: Like Xu <like.xu@linux.intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>, peterz@infradead.org
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
weijiang.yang@intel.com, eranian@google.com,
wei.w.wang@intel.com, kvm@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, Like Xu <like.xu@linux.intel.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Andi Kleen <andi.kleen@intel.com>
Subject: [PATCH v3 5/5] KVM: x86/pmu: Expose PEBS-via-PT in the KVM supported capabilities
Date: Wed, 12 May 2021 16:44:46 +0800 [thread overview]
Message-ID: <20210512084446.342526-6-like.xu@linux.intel.com> (raw)
In-Reply-To: <20210512084446.342526-1-like.xu@linux.intel.com>
The hypervisor userspace can dis/enable it via the MSR-based feature
"MSR_IA32_PERF_CAPABILITIES [bit 16]". If guest also has basic PT support,
it can output the PEBS records to the PT buffer.
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
---
arch/x86/kvm/vmx/capabilities.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index fd8c9822db9e..e04b50174dd5 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -398,8 +398,11 @@ static inline u64 vmx_get_perf_capabilities(void)
perf_cap |= host_perf_cap & PMU_CAP_LBR_FMT;
- if (vmx_pebs_supported())
+ if (vmx_pebs_supported()) {
perf_cap |= host_perf_cap & PERF_CAP_PEBS_MASK;
+ if (vmx_pt_mode_is_host_guest())
+ perf_cap |= host_perf_cap & PERF_CAP_PEBS_OUTPUT_PT;
+ }
return perf_cap;
}
--
2.31.1
prev parent reply other threads:[~2021-05-12 8:46 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-12 8:44 [PATCH v3 0/5] KVM: x86/pmu: Add support to enable guest PEBS via PT Like Xu
2021-05-12 8:44 ` [PATCH v3 1/5] KVM: x86/pmu: Add pebs_vmx support for ATOM_TREMONT Like Xu
2021-05-12 8:44 ` [PATCH v3 2/5] KVM: x86/pmu: Add the base address parameter for get_fixed_pmc() Like Xu
2021-05-12 8:44 ` [PATCH v3 3/5] KVM: x86/pmu: Add counter reload MSR emulation for all counters Like Xu
2021-05-12 8:44 ` [PATCH v3 4/5] KVM: x86/pmu: Add counter reload registers to the MSR-load list Like Xu
2021-05-12 8:44 ` Like Xu [this message]
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