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Commit 1cea0ce6 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Paolo Bonzini
Browse files

KVM: VMX: drop rdtscp_enabled field 



Check cpuid bit instead of it

Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 7ec36296

arch/x86/kvm/cpuid.h

+8 −0
Original line number Diff line number Diff line
@@ -141,4 +141,12 @@ static inline bool guest_cpuid_has_pcommit(struct kvm_vcpu *vcpu) 
	best = kvm_find_cpuid_entry(vcpu, 7, 0);

	return best && (best->ebx & bit(X86_FEATURE_PCOMMIT));

}



static inline bool guest_cpuid_has_rdtscp(struct kvm_vcpu *vcpu)

{

	struct kvm_cpuid_entry2 *best;



	best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);

	return best && (best->edx & bit(X86_FEATURE_RDTSCP));

}

#endif

arch/x86/kvm/vmx.c

+6 −11
Original line number Diff line number Diff line
@@ -532,8 +532,6 @@ struct vcpu_vmx { 
	s64 vnmi_blocked_time;

	u32 exit_reason;



	bool rdtscp_enabled;



	/* Posted interrupt descriptor */

	struct pi_desc pi_desc;
@@ -2208,7 +2206,7 @@ static void setup_msrs(struct vcpu_vmx *vmx) 
		if (index >= 0)

			move_msr_up(vmx, index, save_nmsrs++);

		index = __find_msr_index(vmx, MSR_TSC_AUX);

		if (index >= 0 && vmx->rdtscp_enabled)

		if (index >= 0 && guest_cpuid_has_rdtscp(&vmx->vcpu))

			move_msr_up(vmx, index, save_nmsrs++);

		/*

		 * MSR_STAR is only needed on long mode guests, and only
@@ -2675,7 +2673,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 
		msr_info->data = vcpu->arch.ia32_xss;

		break;

	case MSR_TSC_AUX:

		if (!to_vmx(vcpu)->rdtscp_enabled)

		if (!guest_cpuid_has_rdtscp(vcpu))

			return 1;

		/* Otherwise falls through */

	default:
@@ -2781,7 +2779,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) 
			clear_atomic_switch_msr(vmx, MSR_IA32_XSS);

		break;

	case MSR_TSC_AUX:

		if (!vmx->rdtscp_enabled)

		if (!guest_cpuid_has_rdtscp(vcpu))

			return 1;

		/* Check reserved bit, higher 32 bits should be zero */

		if ((data >> 32) != 0)
@@ -8682,16 +8680,13 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu) 
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	u32 secondary_exec_ctl = vmx_secondary_exec_control(vmx);



	vmx->rdtscp_enabled = false;

	if (vmx_rdtscp_supported()) {

		best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);

		if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))

			vmx->rdtscp_enabled = true;

		else

		bool rdtscp_enabled = guest_cpuid_has_rdtscp(vcpu);

		if (!rdtscp_enabled)

			secondary_exec_ctl &= ~SECONDARY_EXEC_RDTSCP;



		if (nested) {

			if (vmx->rdtscp_enabled)

			if (rdtscp_enabled)

				vmx->nested.nested_vmx_secondary_ctls_high |=

					SECONDARY_EXEC_RDTSCP;

			else