[Devel] [PATCH rh7 v1 24/36] ms/kvm/x86: Hyper-V internal helper to read MSR HV_X64_MSR_TIME_REF_COUNT

[Andrey Smetanin]

This helper will be used also in Hyper-V SynIC timers implementation.

ms commit - 93bf4172481c4b2a8544c83a687946252563edd0.

Signed-off-by: Andrey Smetanin <asmetanin at virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan at virtuozzo.com>
CC: Gleb Natapov <gleb at kernel.org>
CC: Paolo Bonzini <pbonzini at redhat.com>
CC: "K. Y. Srinivasan" <kys at microsoft.com>
CC: Haiyang Zhang <haiyangz at microsoft.com>
CC: Vitaly Kuznetsov <vkuznets at redhat.com>
CC: Roman Kagan <rkagan at virtuozzo.com>
CC: Denis V. Lunev <den at openvz.org>
CC: qemu-devel at nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
---
 arch/x86/kvm/hyperv.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 41869a9..9958926 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -335,6 +335,11 @@ static void synic_init(struct kvm_vcpu_hv_synic *synic)
 	}
 }
 
+static u64 get_time_ref_counter(struct kvm *kvm)
+{
+	return div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100);
+}
+
 void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
 {
 	synic_init(vcpu_to_synic(vcpu));
@@ -576,11 +581,9 @@ static int kvm_hv_get_msr_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case HV_X64_MSR_HYPERCALL:
 		data = hv->hv_hypercall;
 		break;
-	case HV_X64_MSR_TIME_REF_COUNT: {
-		data =
-		     div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100);
+	case HV_X64_MSR_TIME_REF_COUNT:
+		data = get_time_ref_counter(kvm);
 		break;
-	}
 	case HV_X64_MSR_REFERENCE_TSC:
 		data = hv->hv_tsc_page;
 		break;
-- 
2.4.3