From: Nicușor Cîțu <nicu.c...@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.c...@icloud.com>
Signed-off-by: Adalbert Lazăr <ala...@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 --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,
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