diff mbox series

[RFC,v7,19/78] KVM: x86: add .control_msr_intercept()

Message ID 20200207181636.1065-20-alazar@bitdefender.com (mailing list archive)
State New, archived
Headers show
Series VM introspection | expand

Commit Message

Adalbert Lazăr Feb. 7, 2020, 6:15 p.m. UTC 
From: Mihai Donțu <mdontu@bitdefender.com>

This is needed for the KVMI_EVENT_MSR event.
Signed-off-by: Mihai Donțu <mdontu@bitdefender.com>
Co-developed-by: Nicușor Cîțu <ncitu@bitdefender.com>
Signed-off-by: Nicușor Cîțu <ncitu@bitdefender.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 arch/x86/include/asm/kvm_host.h |  2 ++
 arch/x86/kvm/svm.c              | 11 +++++++++++
 arch/x86/kvm/vmx/vmx.c          | 10 ++++++++++
 3 files changed, 23 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 2136f273645a..d8c61cc301fa 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1060,6 +1060,8 @@  struct kvm_x86_ops {
 	void (*update_bp_intercept)(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);
+	void (*control_msr_intercept)(struct kvm_vcpu *vcpu, unsigned int msr,
+				      int type, bool enable);
 	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,
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 174ced633b60..21f02d92af78 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -7339,6 +7339,16 @@  static inline bool svm_desc_intercepted(struct kvm_vcpu *vcpu)
 		get_intercept(svm, INTERCEPT_LOAD_TR));
 }
 
+static void svm_control_msr_intercept(struct kvm_vcpu *vcpu, unsigned int msr,
+				      int type, bool enable)
+{
+	const struct vcpu_svm *svm = to_svm(vcpu);
+	u32 *msrpm = is_guest_mode(vcpu) ? svm->nested.msrpm :
+					   svm->msrpm;
+
+	set_msr_interception(vcpu, msrpm, msr, type, !enable);
+}
+
 static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
 	.cpu_has_kvm_support = has_svm,
 	.disabled_by_bios = is_disabled,
@@ -7370,6 +7380,7 @@  static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
 	.get_msr_feature = svm_get_msr_feature,
 	.get_msr = svm_get_msr,
 	.set_msr = svm_set_msr,
+	.control_msr_intercept = svm_control_msr_intercept,
 	.msr_write_intercepted = msr_write_intercepted,
 	.get_segment_base = svm_get_segment_base,
 	.get_segment = svm_get_segment,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e6878097d736..7a61427af370 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7806,6 +7806,15 @@  static bool vmx_desc_intercepted(struct kvm_vcpu *vcpu)
 	return !!(secondary_exec_controls_get(vmx) & SECONDARY_EXEC_DESC);
 }
 
+static void vmx_control_msr_intercept(struct kvm_vcpu *vcpu, unsigned int msr,
+				      int type, bool enable)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	unsigned long *msr_bitmap = vmx->vmcs01.msr_bitmap;
+
+	vmx_set_intercept_for_msr(vcpu, msr_bitmap, msr, type, enable);
+}
+
 static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
 	.cpu_has_kvm_support = cpu_has_kvm_support,
 	.disabled_by_bios = vmx_disabled_by_bios,
@@ -7834,6 +7843,7 @@  static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
 	.get_msr_feature = vmx_get_msr_feature,
 	.get_msr = vmx_get_msr,
 	.set_msr = vmx_set_msr,
+	.control_msr_intercept = vmx_control_msr_intercept,
 	.msr_write_intercepted = msr_write_intercepted,
 	.get_segment_base = vmx_get_segment_base,
 	.get_segment = vmx_get_segment,