From: Adalbert Lazar <alazar@xxxxxxxxxxxxxxx>
Inform the guest introspection tool that a system table pointer register
(GDTR, IDTR, LDTR, TR) has been accessed.
Signed-off-by: Nicușor Cîțu <ncitu@xxxxxxxxxxxxxxx>
---
arch/x86/kvm/svm.c | 41 +++++++++++++++++++++++++++++++++++++++++
arch/x86/kvm/vmx.c | 27 +++++++++++++++++++++++++++
2 files changed, 68 insertions(+)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8903e0c58609..3b4911205081 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -4109,6 +4109,39 @@ static int avic_unaccelerated_access_interception(struct vcpu_svm *svm)
return ret;
}
+static int descriptor_access_interception(struct vcpu_svm *svm)
+{
+ struct kvm_vcpu *vcpu = &svm->vcpu;
+ struct vmcb_control_area *c = &svm->vmcb->control;
+
+ switch (c->exit_code) {
+ case SVM_EXIT_IDTR_READ:
+ case SVM_EXIT_IDTR_WRITE:
+ kvmi_descriptor_event(vcpu, c->exit_info_1, 0,
+ KVMI_DESC_IDTR, c->exit_code == SVM_EXIT_IDTR_WRITE);
+ break;
+ case SVM_EXIT_GDTR_READ:
+ case SVM_EXIT_GDTR_WRITE:
+ kvmi_descriptor_event(vcpu, c->exit_info_1, 0,
+ KVMI_DESC_GDTR, c->exit_code == SVM_EXIT_GDTR_WRITE);
+ break;
+ case SVM_EXIT_LDTR_READ:
+ case SVM_EXIT_LDTR_WRITE:
+ kvmi_descriptor_event(vcpu, c->exit_info_1, 0,
+ KVMI_DESC_LDTR, c->exit_code == SVM_EXIT_LDTR_WRITE);
+ break;
+ case SVM_EXIT_TR_READ:
+ case SVM_EXIT_TR_WRITE:
+ kvmi_descriptor_event(vcpu, c->exit_info_1, 0,
+ KVMI_DESC_TR, c->exit_code == SVM_EXIT_TR_WRITE);
+ break;
+ default:
+ break;
+ }
+
+ return 1;
+}
+
static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_READ_CR0] = cr_interception,
[SVM_EXIT_READ_CR3] = cr_interception,
@@ -4173,6 +4206,14 @@ static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
[SVM_EXIT_RSM] = emulate_on_interception,
[SVM_EXIT_AVIC_INCOMPLETE_IPI] = avic_incomplete_ipi_interception,
[SVM_EXIT_AVIC_UNACCELERATED_ACCESS] = avic_unaccelerated_access_interception,
+ [SVM_EXIT_IDTR_READ] = descriptor_access_interception,
+ [SVM_EXIT_GDTR_READ] = descriptor_access_interception,
+ [SVM_EXIT_LDTR_READ] = descriptor_access_interception,
+ [SVM_EXIT_TR_READ] = descriptor_access_interception,
+ [SVM_EXIT_IDTR_WRITE] = descriptor_access_interception,
+ [SVM_EXIT_GDTR_WRITE] = descriptor_access_interception,
+ [SVM_EXIT_LDTR_WRITE] = descriptor_access_interception,
+ [SVM_EXIT_TR_WRITE] = descriptor_access_interception,
};
static void dump_vmcb(struct kvm_vcpu *vcpu)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index fbdfa8507d4f..ab744f04ae90 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8047,6 +8047,31 @@ static int handle_preemption_timer(struct kvm_vcpu *vcpu)
return 1;
}
+static int handle_descriptor_access(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+ u32 exit_reason = vmx->exit_reason;
+ unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
+ unsigned char store = (vmx_instruction_info >> 29) & 0x1;
+ unsigned char descriptor = 0;
+
+ if (exit_reason == EXIT_REASON_GDTR_IDTR) {
+ if ((vmx_instruction_info >> 28) & 0x1)
+ descriptor = KVMI_DESC_IDTR;
+ else
+ descriptor = KVMI_DESC_GDTR;
+ } else {
+ if ((vmx_instruction_info >> 28) & 0x1)
+ descriptor = KVMI_DESC_TR;
+ else
+ descriptor = KVMI_DESC_LDTR;
+ }
+
+ return kvmi_descriptor_event(vcpu, vmx_instruction_info,
+ exit_qualification, descriptor, store);
+}
+
static bool valid_ept_address(struct kvm_vcpu *vcpu, u64 address)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -8219,6 +8244,8 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_PML_FULL] = handle_pml_full,
[EXIT_REASON_VMFUNC] = handle_vmfunc,
[EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer,
+ [EXIT_REASON_GDTR_IDTR] = handle_descriptor_access,
+ [EXIT_REASON_LDTR_TR] = handle_descriptor_access,
};
static const int kvm_vmx_max_exit_handlers =
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