diff mbox series

[v10,14/81] KVM: x86: add kvm_x86_ops.desc_intercepted()

Message ID 20201125093600.2766-15-alazar@bitdefender.com (mailing list archive)
State New, archived
Headers show
Series VM introspection | expand

Commit Message

Adalbert Lazăr Nov. 25, 2020, 9:34 a.m. UTC 
From: Nicușor Cîțu <nicu.citu@icloud.com>

This function will be used to test if the descriptor-table registers
access is already tracked by userspace.

Signed-off-by: Nicușor Cîțu <nicu.citu@icloud.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 arch/x86/include/asm/kvm_host.h |  1 +
 arch/x86/kvm/svm/svm.c          | 15 +++++++++++++++
 arch/x86/kvm/vmx/vmx.c          |  8 ++++++++
 3 files changed, 24 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 730429cd2e3d..0e9144e23ce6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1132,6 +1132,7 @@  struct kvm_x86_ops {
 	void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
 	bool (*desc_ctrl_supported)(void);
 	void (*control_desc_intercept)(struct kvm_vcpu *vcpu, bool enable);
+	bool (*desc_intercepted)(struct kvm_vcpu *vcpu);
 	void (*sync_dirty_debug_regs)(struct kvm_vcpu *vcpu);
 	void (*set_dr7)(struct kvm_vcpu *vcpu, unsigned long value);
 	void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index c8e56ad9cbb1..86f0dcf9fecd 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1660,6 +1660,20 @@  static void svm_control_desc_intercept(struct kvm_vcpu *vcpu, bool enable)
 	}
 }
 
+static inline bool svm_desc_intercepted(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_svm *svm = to_svm(vcpu);
+
+	return (svm_is_intercept(svm, INTERCEPT_STORE_IDTR) ||
+		svm_is_intercept(svm, INTERCEPT_STORE_GDTR) ||
+		svm_is_intercept(svm, INTERCEPT_STORE_LDTR) ||
+		svm_is_intercept(svm, INTERCEPT_STORE_TR) ||
+		svm_is_intercept(svm, INTERCEPT_LOAD_IDTR) ||
+		svm_is_intercept(svm, INTERCEPT_LOAD_GDTR) ||
+		svm_is_intercept(svm, INTERCEPT_LOAD_LDTR) ||
+		svm_is_intercept(svm, INTERCEPT_LOAD_TR));
+}
+
 static void update_cr0_intercept(struct vcpu_svm *svm)
 {
 	ulong gcr0 = svm->vcpu.arch.cr0;
@@ -4307,6 +4321,7 @@  static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.set_gdt = svm_set_gdt,
 	.desc_ctrl_supported = svm_desc_ctrl_supported,
 	.control_desc_intercept = svm_control_desc_intercept,
+	.desc_intercepted = svm_desc_intercepted,
 	.set_dr7 = svm_set_dr7,
 	.sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
 	.cache_reg = svm_cache_reg,
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 20351e027898..5bd6a4add27e 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3361,6 +3361,13 @@  static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
 	vmcs_writel(GUEST_GDTR_BASE, dt->address);
 }
 
+static bool vmx_desc_intercepted(struct kvm_vcpu *vcpu)
+{
+	struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+	return !!(secondary_exec_controls_get(vmx) & SECONDARY_EXEC_DESC);
+}
+
 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
 {
 	struct kvm_segment var;
@@ -7668,6 +7675,7 @@  static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.set_gdt = vmx_set_gdt,
 	.desc_ctrl_supported = vmx_desc_ctrl_supported,
 	.control_desc_intercept = vmx_control_desc_intercept,
+	.desc_intercepted = vmx_desc_intercepted,
 	.set_dr7 = vmx_set_dr7,
 	.sync_dirty_debug_regs = vmx_sync_dirty_debug_regs,
 	.cache_reg = vmx_cache_reg,