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From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Xiaoyao Li <xiaoyao.li@intel.com>,
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>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 3/5] KVM: VMX: RTIT_CTL_BRANCH_EN has no dependency on other CPUID bit
Date: Tue, 24 Aug 2021 19:07:41 +0800 [thread overview]
Message-ID: <20210824110743.531127-4-xiaoyao.li@intel.com> (raw)
In-Reply-To: <20210824110743.531127-1-xiaoyao.li@intel.com>
Per Intel SDM, RTIT_CTL_BRANCH_EN bit has no dependency on any CPUID
leaf 0x14.
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 7ed96c460661..4a70a6d2f442 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7116,7 +7116,8 @@ static void update_intel_pt_cfg(struct kvm_vcpu *vcpu)
/* Initialize and clear the no dependency bits */
vmx->pt_desc.ctl_bitmask = ~(RTIT_CTL_TRACEEN | RTIT_CTL_OS |
- RTIT_CTL_USR | RTIT_CTL_TSC_EN | RTIT_CTL_DISRETC);
+ RTIT_CTL_USR | RTIT_CTL_TSC_EN | RTIT_CTL_DISRETC |
+ RTIT_CTL_BRANCH_EN);
/*
* If CPUID.(EAX=14H,ECX=0):EBX[0]=1 CR3Filter can be set otherwise
@@ -7134,12 +7135,11 @@ static void update_intel_pt_cfg(struct kvm_vcpu *vcpu)
RTIT_CTL_CYC_THRESH | RTIT_CTL_PSB_FREQ);
/*
- * If CPUID.(EAX=14H,ECX=0):EBX[3]=1 MTCEn BranchEn and
- * MTCFreq can be set
+ * If CPUID.(EAX=14H,ECX=0):EBX[3]=1 MTCEn and MTCFreq can be set
*/
if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_mtc))
vmx->pt_desc.ctl_bitmask &= ~(RTIT_CTL_MTC_EN |
- RTIT_CTL_BRANCH_EN | RTIT_CTL_MTC_RANGE);
+ RTIT_CTL_MTC_RANGE);
/* If CPUID.(EAX=14H,ECX=0):EBX[4]=1 FUPonPTW and PTWEn can be set */
if (intel_pt_validate_cap(vmx->pt_desc.caps, PT_CAP_ptwrite))
--
2.27.0
next prev parent reply other threads:[~2021-08-24 11:08 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 11:07 [PATCH 0/5] KVM: VMX: PT (processor trace) optimizations and fixes Xiaoyao Li
2021-08-24 11:07 ` [PATCH 1/5] KVM: VMX: Restore host's MSR_IA32_RTIT_CTL when it's not zero Xiaoyao Li
2021-08-24 17:54 ` Sean Christopherson
2021-08-24 11:07 ` [PATCH 2/5] KVM: VMX: Use cached vmx->pt_desc.addr_range Xiaoyao Li
2021-08-24 15:24 ` Sean Christopherson
2021-08-24 15:42 ` Xiaoyao Li
2021-08-24 11:07 ` Xiaoyao Li [this message]
2021-08-25 3:30 ` [PATCH 3/5] KVM: VMX: RTIT_CTL_BRANCH_EN has no dependency on other CPUID bit Like Xu
2021-08-25 4:19 ` Xiaoyao Li
2021-08-25 6:08 ` Like Xu
2021-08-25 6:33 ` Xiaoyao Li
2021-08-25 8:14 ` Like Xu
2021-08-25 8:58 ` Xiaoyao Li
2021-08-25 11:53 ` Alexander Shishkin
2021-08-24 11:07 ` [PATCH 4/5] KVM: VMX: Disallow PT MSRs accessing if PT is not exposed to guest Xiaoyao Li
2021-08-24 14:20 ` Sean Christopherson
2021-08-24 15:35 ` Xiaoyao Li
2021-08-24 16:48 ` Sean Christopherson
2021-08-24 11:07 ` [PATCH 5/5] KVM: VMX: Check Intel PT related CPUID leaves Xiaoyao Li
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