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Subject[PATCH RESEND v3 2/3] KVM: vmx: Emulate MSR IA32_UMWAIT_CONTROL
Date
UMWAIT and TPAUSE instructions use IA32_UMWAIT_CONTROL at MSR index E1H
to determines the maximum time in TSC-quanta that the processor can reside
in either C0.1 or C0.2.

This patch emulates MSR IA32_UMWAIT_CONTROL in guest and differentiate
IA32_UMWAIT_CONTROL between host and guest. The variable
mwait_control_cached in arch/x86/power/umwait.c caches the MSR value, so
this patch uses it to avoid frequently rdmsr of IA32_UMWAIT_CONTROL.

Co-developed-by: Jingqi Liu <jingqi.liu@intel.com>
Signed-off-by: Jingqi Liu <jingqi.liu@intel.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 36 ++++++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx/vmx.h | 3 +++
arch/x86/power/umwait.c | 3 ++-
3 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index b35bfac30a34..f33a25e82cb8 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1679,6 +1679,12 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
#endif
case MSR_EFER:
return kvm_get_msr_common(vcpu, msr_info);
+ case MSR_IA32_UMWAIT_CONTROL:
+ if (!vmx_waitpkg_supported())
+ return 1;
+
+ msr_info->data = vmx->msr_ia32_umwait_control;
+ break;
case MSR_IA32_SPEC_CTRL:
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL))
@@ -1841,6 +1847,15 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
return 1;
vmcs_write64(GUEST_BNDCFGS, data);
break;
+ case MSR_IA32_UMWAIT_CONTROL:
+ if (!vmx_waitpkg_supported())
+ return 1;
+
+ if (!data)
+ break;
+
+ vmx->msr_ia32_umwait_control = data;
+ break;
case MSR_IA32_SPEC_CTRL:
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL))
@@ -4126,6 +4141,8 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
vmx->rmode.vm86_active = 0;
vmx->spec_ctrl = 0;

+ vmx->msr_ia32_umwait_control = 0;
+
vcpu->arch.microcode_version = 0x100000000ULL;
vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
kvm_set_cr8(vcpu, 0);
@@ -6339,6 +6356,23 @@ static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
msrs[i].host, false);
}

+static void atomic_switch_ia32_umwait_control(struct vcpu_vmx *vmx)
+{
+ u64 host_umwait_control;
+
+ if (!vmx_waitpkg_supported())
+ return;
+
+ host_umwait_control = umwait_control_cached;
+
+ if (vmx->msr_ia32_umwait_control != host_umwait_control)
+ add_atomic_switch_msr(vmx, MSR_IA32_UMWAIT_CONTROL,
+ vmx->msr_ia32_umwait_control,
+ host_umwait_control, false);
+ else
+ clear_atomic_switch_msr(vmx, MSR_IA32_UMWAIT_CONTROL);
+}
+
static void vmx_arm_hv_timer(struct vcpu_vmx *vmx, u32 val)
{
vmcs_write32(VMX_PREEMPTION_TIMER_VALUE, val);
@@ -6447,6 +6481,8 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu)

atomic_switch_perf_msrs(vmx);

+ atomic_switch_ia32_umwait_control(vmx);
+
vmx_update_hv_timer(vcpu);

/*
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 61128b48c503..8485bec7c38a 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -14,6 +14,8 @@
extern const u32 vmx_msr_index[];
extern u64 host_efer;

+extern u32 umwait_control_cached;
+
#define MSR_TYPE_R 1
#define MSR_TYPE_W 2
#define MSR_TYPE_RW 3
@@ -194,6 +196,7 @@ struct vcpu_vmx {
#endif

u64 spec_ctrl;
+ u64 msr_ia32_umwait_control;

u32 vm_entry_controls_shadow;
u32 vm_exit_controls_shadow;
diff --git a/arch/x86/power/umwait.c b/arch/x86/power/umwait.c
index 7fa381e3fd4e..2e6ce4cbccb3 100644
--- a/arch/x86/power/umwait.c
+++ b/arch/x86/power/umwait.c
@@ -9,7 +9,8 @@
* MSR value. By default, umwait max time is 100000 in TSC-quanta and C0.2
* is enabled
*/
-static u32 umwait_control_cached = 100000;
+u32 umwait_control_cached = 100000;
+EXPORT_SYMBOL_GPL(umwait_control_cached);

/*
* Serialize access to umwait_control_cached and IA32_UMWAIT_CONTROL MSR
--
2.20.1
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