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Commit ad721883 authored by Haozhong Zhang's avatar Haozhong Zhang Committed by Paolo Bonzini
Browse files

KVM: x86: Add a common TSC scaling ratio field in kvm_vcpu_arch 



This patch moves the field of TSC scaling ratio from the architecture
struct vcpu_svm to the common struct kvm_vcpu_arch.

Signed-off-by: default avatarHaozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent bc9b961b

arch/x86/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -505,6 +505,7 @@ struct kvm_vcpu_arch { 
	u32 virtual_tsc_mult;

	u32 virtual_tsc_khz;

	s64 ia32_tsc_adjust_msr;

	u64 tsc_scaling_ratio;



	atomic_t nmi_queued;  /* unprocessed asynchronous NMIs */

	unsigned nmi_pending; /* NMI queued after currently running handler */

arch/x86/kvm/svm.c

+11 −15
Original line number Diff line number Diff line
@@ -158,8 +158,6 @@ struct vcpu_svm { 
	unsigned long int3_rip;

	u32 apf_reason;



	u64  tsc_ratio;



	/* cached guest cpuid flags for faster access */

	bool nrips_enabled	: 1;

};
@@ -991,24 +989,22 @@ static u64 __scale_tsc(u64 ratio, u64 tsc) 


static u64 svm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc)

{

	struct vcpu_svm *svm = to_svm(vcpu);

	u64 _tsc = tsc;



	if (svm->tsc_ratio != TSC_RATIO_DEFAULT)

		_tsc = __scale_tsc(svm->tsc_ratio, tsc);

	if (vcpu->arch.tsc_scaling_ratio != TSC_RATIO_DEFAULT)

		_tsc = __scale_tsc(vcpu->arch.tsc_scaling_ratio, tsc);



	return _tsc;

}



static void svm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)

{

	struct vcpu_svm *svm = to_svm(vcpu);

	u64 ratio;

	u64 khz;



	/* Guest TSC same frequency as host TSC? */

	if (!scale) {

		svm->tsc_ratio = TSC_RATIO_DEFAULT;

		vcpu->arch.tsc_scaling_ratio = TSC_RATIO_DEFAULT;

		return;

	}
@@ -1033,7 +1029,7 @@ static void svm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale) 
				user_tsc_khz);

		return;

	}

	svm->tsc_ratio             = ratio;

	vcpu->arch.tsc_scaling_ratio = ratio;

}



static u64 svm_read_tsc_offset(struct kvm_vcpu *vcpu)
@@ -1067,7 +1063,7 @@ static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool ho 
	struct vcpu_svm *svm = to_svm(vcpu);



	if (host) {

		if (svm->tsc_ratio != TSC_RATIO_DEFAULT)

		if (vcpu->arch.tsc_scaling_ratio != TSC_RATIO_DEFAULT)

			WARN_ON(adjustment < 0);

		adjustment = svm_scale_tsc(vcpu, (u64)adjustment);

	}
@@ -1238,8 +1234,6 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) 
		goto out;

	}



	svm->tsc_ratio = TSC_RATIO_DEFAULT;



	err = kvm_vcpu_init(&svm->vcpu, kvm, id);

	if (err)

		goto free_svm;
@@ -1325,10 +1319,12 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)

		rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);



	if (static_cpu_has(X86_FEATURE_TSCRATEMSR) &&

	    svm->tsc_ratio != __this_cpu_read(current_tsc_ratio)) {

		__this_cpu_write(current_tsc_ratio, svm->tsc_ratio);

		wrmsrl(MSR_AMD64_TSC_RATIO, svm->tsc_ratio);

	if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {

		u64 tsc_ratio = vcpu->arch.tsc_scaling_ratio;

		if (tsc_ratio != __this_cpu_read(current_tsc_ratio)) {

			__this_cpu_write(current_tsc_ratio, tsc_ratio);

			wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);

		}

	}

}

arch/x86/kvm/x86.c

+8 −1
Original line number Diff line number Diff line
@@ -113,6 +113,7 @@ u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits; 
EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits);

u64  __read_mostly kvm_max_tsc_scaling_ratio;

EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio);

static u64 __read_mostly kvm_default_tsc_scaling_ratio;



/* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */

static u32 __read_mostly tsc_tolerance_ppm = 250;
@@ -1258,8 +1259,11 @@ static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz) 
	int use_scaling = 0;



	/* tsc_khz can be zero if TSC calibration fails */

	if (this_tsc_khz == 0)

	if (this_tsc_khz == 0) {

		/* set tsc_scaling_ratio to a safe value */

		vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio;

		return;

	}



	/* Compute a scale to convert nanoseconds in TSC cycles */

	kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
@@ -7367,6 +7371,9 @@ int kvm_arch_hardware_setup(void) 
	if (r != 0)

		return r;



	if (kvm_has_tsc_control)

		kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits;



	kvm_init_msr_list();

	return 0;

}