The commit is pushed to "branch-rh7-3.10.0-327.36.1.vz7.19.x-ovz" and will
appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-327.36.1.vz7.19.9
------>
commit cbb7e53d82340e36cf5fb28f52f4114195166744
Author: Haozhong Zhang <haozhong.zh...@intel.com>
Date: Wed Nov 16 16:45:58 2016 +0400
ms/KVM: x86: Move TSC scaling logic out of call-back read_l1_tsc()
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.zh...@intel.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
(cherry-picked from commit 4ba76538dd52dd9b18b464e509cb8f3ed4ed993f)
Signed-off-by: Denis Plotnikov <dplotni...@virtuozzo.com>
Signed-off-by: Roman Kagan <rka...@virtuozzo.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/lapic.c | 4 ++--
arch/x86/kvm/svm.c | 3 +--
arch/x86/kvm/x86.c | 11 ++++++++---
4 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index ca305fc..830d1cd 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1189,6 +1189,7 @@ 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);
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index d6d6b52..3041749 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1125,7 +1125,7 @@ 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, native_read_tsc());
+ guest_tsc = kvm_read_l1_tsc(vcpu, native_read_tsc());
trace_kvm_wait_lapic_expire(vcpu->vcpu_id, guest_tsc - tsc_deadline);
/* __delay is delay_tsc whenever the hardware has TSC, thus always. */
@@ -1223,7 +1223,7 @@ 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, native_read_tsc());
+ guest_tsc = kvm_read_l1_tsc(vcpu, native_read_tsc());
if (likely(tscdeadline > guest_tsc)) {
ns = (tscdeadline - guest_tsc) * 1000000ULL;
do_div(ns, this_tsc_khz);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b7c2e94..6636074 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2971,8 +2971,7 @@ 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)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5a7d050..3913a62 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1379,6 +1379,12 @@ 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;
@@ -1810,7 +1816,7 @@ 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
@@ -6658,8 +6664,7 @@ 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,
- native_read_tsc());
+ vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, native_read_tsc());
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
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