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KVM: x86: Move TSC scaling logic out of call-back read_l1_tsc()

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Both VMX and SVM scales the host TSC in the same way in call-back
read_l1_tsc(), so this patch moves the scaling logic from call-back
read_l1_tsc() to a common function kvm_read_l1_tsc().

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Haozhong Zhang 2015-10-20 15:39:07 +08:00 committed by Paolo Bonzini
parent 58ea676787
commit 4ba76538dd
4 changed files with 12 additions and 7 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -1226,6 +1226,7 @@ void kvm_define_shared_msr(unsigned index, u32 msr);
int kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc);
u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc);
unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu);
bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip);

4
arch/x86/kvm/lapic.c
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@ -1250,7 +1250,7 @@ void wait_lapic_expire(struct kvm_vcpu *vcpu)
tsc_deadline = apic->lapic_timer.expired_tscdeadline;
apic->lapic_timer.expired_tscdeadline = 0;
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, rdtsc());
guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
/* __delay is delay_tsc whenever the hardware has TSC, thus always. */
@ -1318,7 +1318,7 @@ static void start_apic_timer(struct kvm_lapic *apic)
local_irq_save(flags);
now = apic->lapic_timer.timer.base->get_time();
guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu, rdtsc());
guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
if (likely(tscdeadline > guest_tsc)) {
ns = (tscdeadline - guest_tsc) * 1000000ULL;
do_div(ns, this_tsc_khz);

3
arch/x86/kvm/svm.c
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@ -2984,8 +2984,7 @@ static int cr8_write_interception(struct vcpu_svm *svm)
static u64 svm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
{
struct vmcb *vmcb = get_host_vmcb(to_svm(vcpu));
return vmcb->control.tsc_offset +
kvm_scale_tsc(vcpu, host_tsc);
return vmcb->control.tsc_offset + host_tsc;
}
static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)

11
arch/x86/kvm/x86.c
View File

@ -1401,6 +1401,12 @@ static u64 kvm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
return target_tsc - tsc;
}
u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
{
return kvm_x86_ops->read_l1_tsc(vcpu, kvm_scale_tsc(vcpu, host_tsc));
}
EXPORT_SYMBOL_GPL(kvm_read_l1_tsc);
void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr)
{
struct kvm *kvm = vcpu->kvm;
@ -1738,7 +1744,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
kernel_ns = get_kernel_ns();
}
tsc_timestamp = kvm_x86_ops->read_l1_tsc(v, host_tsc);
tsc_timestamp = kvm_read_l1_tsc(v, host_tsc);
/*
* We may have to catch up the TSC to match elapsed wall clock
@ -6545,8 +6551,7 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
if (hw_breakpoint_active())
hw_breakpoint_restore();
vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu,
rdtsc());
vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();