From: Haozhong Zhang <haozhong.zhang@intel.com>
Date: Tue, 20 Oct 2015 07:39:10 +0000 (+0800)
Subject: KVM: VMX: Setup TSC scaling ratio when a vcpu is loaded
X-Git-Tag: v4.4-rc1~28^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ff2c3a1803775cc72dc6f624b59554956396b0ee;p=platform%2Fkernel%2Flinux-exynos.git

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 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
 		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;
 	}