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KVM: VMX: simplify rdtscp handling in vmx_cpuid_update()

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if vmx_rdtscp_supported() is true SECONDARY_EXEC_RDTSCP must
have already been set in current vmcs by
vmx_secondary_exec_control()

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiao Guangrong 2015-09-09 14:05:53 +08:00 committed by Paolo Bonzini
parent e2821620c0
commit f36201e5f4
1 changed files with 8 additions and 9 deletions
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17
arch/x86/kvm/vmx.c
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@ -8677,16 +8677,15 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
vmx->rdtscp_enabled = false;
if (vmx_rdtscp_supported()) {
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
if (exec_control & SECONDARY_EXEC_RDTSCP) {
best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
vmx->rdtscp_enabled = true;
else {
exec_control &= ~SECONDARY_EXEC_RDTSCP;
vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
exec_control);
}
best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
vmx->rdtscp_enabled = true;
else {
exec_control &= ~SECONDARY_EXEC_RDTSCP;
vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
exec_control);
}
if (nested && !vmx->rdtscp_enabled)
vmx->nested.nested_vmx_secondary_ctls_high &=
~SECONDARY_EXEC_RDTSCP;