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Subject[PATCH v2 4/7] KVM: VMX: RTIT_CTL_BRANCH_EN has no dependency on other CPUID bit
Date
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 c54b99cec0e6..b9d640029c40 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7118,7 +7118,8 @@ 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
@@ -7136,12 +7137,11 @@ 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
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