Darkangeel_hd
/
lineage_android_kernel_xiaomi_sdm845
mirror of https://github.com/Darkangeel-hd/lineage_android_kernel_xiaomi_sdm845.git
1
0
Fork 0
Code Issues Releases Wiki Activity

kvm: x86: Update tsc multiplier on change. 

vmx.c writes the TSC_MULTIPLIER field in vmx_vcpu_load, but only when a
vcpu has migrated physical cpus. Record the last value written and
update in vmx_vcpu_load on any change, otherwise a cpu migration must
occur for TSC frequency scaling to take effect.

Cc: stable@vger.kernel.org
Fixes: ff2c3a1803
Signed-off-by: Owen Hofmann <osh@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Owen Hofmann 2016-03-01 13:36:13 -08:00 committed by Paolo Bonzini
parent 0178fd7dcc
commit 2680d6da45
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
arch/x86/kvm/vmx.c
View File

@ -596,6 +596,8 @@ struct vcpu_vmx {
/* Support for PML */ /* Support for PML */
#define PML_ENTITY_NUM 512 #define PML_ENTITY_NUM 512
struct page *pml_pg; struct page *pml_pg;
u64 current_tsc_ratio;
}; };
enum segment_cache_field { enum segment_cache_field {
@ -2127,14 +2129,16 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp); rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */ 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; vmx->loaded_vmcs->cpu = cpu;
} }
/* Setup TSC multiplier */
if (kvm_has_tsc_control &&
vmx->current_tsc_ratio != vcpu->arch.tsc_scaling_ratio) {
vmx->current_tsc_ratio = vcpu->arch.tsc_scaling_ratio;
vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
}
vmx_vcpu_pi_load(vcpu, cpu); vmx_vcpu_pi_load(vcpu, cpu);
} }