[PATCH v12 13/77] KVM: x86: add kvm_x86_ops.msr_write_intercepted()

Adalbert Lazăr
2021-10-06T17:30:09Z

From: Nicu?or C??u <nicu.citu at icloud.com>

This function will be used to check if the write access for a specific
MSR is already intercepted. The information will be used to restore the
interception status when the introspection tool is no longer interested
in that MSR.

Signed-off-by: Nicu?or C??u <nicu.citu at icloud.com>
Signed-off-by: Adalbert Laz?r <alazar at bitdefender.com>
---
 arch/x86/include/asm/kvm-x86-ops.h | 1 +
 arch/x86/include/asm/kvm_host.h    | 1 +
 arch/x86/kvm/svm/svm.c             | 1 +
 arch/x86/kvm/vmx/vmx.c             | 1 +
 4 files changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/kvm-x86-ops.h
b/arch/x86/include/asm/kvm-x86-ops.h
index 30d01c9ed31b..90e913408c6e 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -127,6 +127,7 @@ KVM_X86_OP(cr3_write_intercepted)
 KVM_X86_OP(desc_ctrl_supported)
 KVM_X86_OP(control_desc_intercept)
 KVM_X86_OP(desc_intercepted)
+KVM_X86_OP(msr_write_intercepted)

 #undef KVM_X86_OP
 #undef KVM_X86_OP_NULL
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1182b0fbd245..1e77cb825ec4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1331,6 +1331,7 @@ struct kvm_x86_ops {
 	void (*update_exception_bitmap)(struct kvm_vcpu *vcpu);
 	int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
 	int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
+	bool (*msr_write_intercepted)(struct kvm_vcpu *vcpu, u32 msr);
 	u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
 	void (*get_segment)(struct kvm_vcpu *vcpu,
 			    struct kvm_segment *var, int seg);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c1b1e5cdd508..31109961183e 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4689,6 +4689,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.get_msr_feature = svm_get_msr_feature,
 	.get_msr = svm_get_msr,
 	.set_msr = svm_set_msr,
+	.msr_write_intercepted = msr_write_intercepted,
 	.get_segment_base = svm_get_segment_base,
 	.get_segment = svm_get_segment,
 	.set_segment = svm_set_segment,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8f34b19827a3..b036aed96912 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7637,6 +7637,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.get_msr_feature = vmx_get_msr_feature,
 	.get_msr = vmx_get_msr,
 	.set_msr = vmx_set_msr,
+	.msr_write_intercepted = msr_write_intercepted,
 	.get_segment_base = vmx_get_segment_base,
 	.get_segment = vmx_get_segment,
 	.set_segment = vmx_set_segment,