From: Marian Rotariu <marian.c.rota...@gmail.com>
The introspection tool uses this function to check the hardware support
for VMFUNC, which can be used either to singlestep vCPUs
on a unprotected EPT view or to use #VE in order to filter out
VM-exits caused by EPT violations.
Signed-off-by: Marian Rotariu <marian.c.rota...@gmail.com>
Co-developed-by: Ștefan Șicleru <ssicl...@bitdefender.com>
Signed-off-by: Ștefan Șicleru <ssicl...@bitdefender.com>
Signed-off-by: Adalbert Lazăr <ala...@bitdefender.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/vmx/vmx.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d96bf0e15ea2..ab6989745f9c 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1300,6 +1300,7 @@ struct kvm_x86_ops {
bool (*spt_fault)(struct kvm_vcpu *vcpu);
bool (*gpt_translation_fault)(struct kvm_vcpu *vcpu);
void (*control_singlestep)(struct kvm_vcpu *vcpu, bool enable);
+ bool (*get_vmfunc_status)(void);
};
struct kvm_x86_nested_ops {
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 8c9ccd1ba0f0..ec4396d5f36f 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7992,6 +7992,11 @@ static void vmx_control_singlestep(struct kvm_vcpu
*vcpu, bool enable)
CPU_BASED_MONITOR_TRAP_FLAG);
}
+static bool vmx_get_vmfunc_status(void)
+{
+ return cpu_has_vmx_vmfunc();
+}
+
static struct kvm_x86_ops vmx_x86_ops __initdata = {
.hardware_unsetup = hardware_unsetup,
@@ -8133,6 +8138,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.spt_fault = vmx_spt_fault,
.gpt_translation_fault = vmx_gpt_translation_fault,
.control_singlestep = vmx_control_singlestep,
+ .get_vmfunc_status = vmx_get_vmfunc_status,
};
static __init int hardware_setup(void)
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