lkml.org 
[lkml]   [2015]   [Oct]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 10/12] KVM: VMX: Setup TSC scaling ratio when a vcpu is loaded
Date
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>
---
arch/x86/kvm/vmx.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a86f790..c241ff3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2062,6 +2062,12 @@ 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;
}

--
2.4.8


\
 
 \ /
  Last update: 2015-10-20 10:01    [W:0.119 / U:0.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site