KVM: VMX: Setup TSC scaling ratio when a vcpu is loaded
This patch makes kvm-intel module to load TSC scaling ratio into TSC
multiplier field of VMCS when a vcpu is loaded, so that TSC scaling
ratio can take effect if VMX TSC scaling is enabled.
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e45b03e..8902952 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2061,6 +2061,12 @@
rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
+
+ /* Setup TSC multiplier */
+ if (cpu_has_vmx_tsc_scaling())
+ vmcs_write64(TSC_MULTIPLIER,
+ vcpu->arch.tsc_scaling_ratio);
+
vmx->loaded_vmcs->cpu = cpu;
}