When the introspection tool tries to enable the KVMI_VCPU_EVENT_DESCRIPTOR
event, this function is used to check if the control of VM-exits caused
by descriptor-table registers access is supported.
Signed-off-by: Adalbert Lazăr <ala...@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 | 6 ++++++
arch/x86/kvm/vmx/capabilities.h | 7 ++++++-
arch/x86/kvm/vmx/vmx.c | 1 +
5 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm-x86-ops.h
b/arch/x86/include/asm/kvm-x86-ops.h
index 04a77a0858ef..9a962bd098d0 100644
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
@@ -124,6 +124,7 @@ KVM_X86_OP_NULL(complete_emulated_msr)
KVM_X86_OP(bp_intercepted)
KVM_X86_OP(control_cr3_intercept)
KVM_X86_OP(cr3_write_intercepted)
+KVM_X86_OP(desc_ctrl_supported)
#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 9c3133380028..1acaa27ffd8f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1349,6 +1349,7 @@ struct kvm_x86_ops {
void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
+ bool (*desc_ctrl_supported)(void);
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 9fac69c8e135..ce45fe0d35bc 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1775,6 +1775,11 @@ static void svm_set_gdt(struct kvm_vcpu *vcpu, struct
desc_ptr *dt)
vmcb_mark_dirty(svm->vmcb, VMCB_DT);
}
+static bool svm_desc_ctrl_supported(void)
+{
+ return true;
+}
+
void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -4647,6 +4652,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.set_idt = svm_set_idt,
.get_gdt = svm_get_gdt,
.set_gdt = svm_set_gdt,
+ .desc_ctrl_supported = svm_desc_ctrl_supported,
.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/capabilities.h b/arch/x86/kvm/vmx/capabilities.h
index 4705ad55abb5..9a25aa0dd9c8 100644
--- a/arch/x86/kvm/vmx/capabilities.h
+++ b/arch/x86/kvm/vmx/capabilities.h
@@ -143,12 +143,17 @@ static inline bool cpu_has_vmx_ept(void)
SECONDARY_EXEC_ENABLE_EPT;
}
-static inline bool vmx_umip_emulated(void)
+static inline bool vmx_desc_ctrl_supported(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_DESC;
}
+static inline bool vmx_umip_emulated(void)
+{
+ return vmx_desc_ctrl_supported();
+}
+
static inline bool cpu_has_vmx_rdtscp(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 3f5731213acf..026d678b82b9 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7635,6 +7635,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.set_idt = vmx_set_idt,
.get_gdt = vmx_get_gdt,
.set_gdt = vmx_set_gdt,
+ .desc_ctrl_supported = vmx_desc_ctrl_supported,
.set_dr7 = vmx_set_dr7,
.sync_dirty_debug_regs = vmx_sync_dirty_debug_regs,
.cache_reg = vmx_cache_reg,
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