linux-kernel - [PATCH v2 4/5] KVM: VMX: Add get/set residency msrs logic

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Date:   Tue, 11 Jun 2019 15:34:10 +0800
From:   Wanpeng Li <kernellwp@...il.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: [PATCH v2 4/5] KVM: VMX: Add get/set residency msrs logic

From: Wanpeng Li <wanpengli@...cent.com>

Add logic to get/set the residency msrs. Then current idle
power-state residency statistics can be consult by guest, and 
be save/restore during live migration.

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
---
 arch/x86/kvm/vmx/vmx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 2ebaa90..852f51e 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1715,6 +1715,9 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 	case MSR_IA32_FEATURE_CONTROL:
 		msr_info->data = vmx->msr_ia32_feature_control;
 		break;
+	case MSR_CORE_C3_RESIDENCY ... MSR_CORE_C7_RESIDENCY:
+		msr_info->data = kvm_residency_read(vcpu, msr_info->index);
+		break;
 	case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
 		if (!nested_vmx_allowed(vcpu))
 			return 1;
@@ -1928,6 +1931,11 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		if (msr_info->host_initiated && data == 0)
 			vmx_leave_nested(vcpu);
 		break;
+	case MSR_CORE_C3_RESIDENCY ... MSR_CORE_C7_RESIDENCY:
+		if (!msr_info->host_initiated)
+			return 1;
+		kvm_residency_write(vcpu, msr_info->index, data);
+		break;
 	case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
 		if (!msr_info->host_initiated)
 			return 1; /* they are read-only */
-- 
2.7.4