[RFC PATCH v5 18/20] kvm: x86: hook in kvmi_xsetbv_event()

[Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>]

Notify the guest introspection tool that the extended control register
has been changed.

Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 40c966e83ff6..89e508ca7c8b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -866,6 +866,11 @@ static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 
 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 {
+#ifdef CONFIG_KVM_INTROSPECTION
+	if (xcr != vcpu->arch.xcr0)
+		kvmi_xsetbv_event(vcpu);
+#endif /* CONFIG_KVM_INTROSPECTION */
+
 	if (kvm_x86_ops->get_cpl(vcpu) != 0 ||
 	    __kvm_set_xcr(vcpu, index, xcr)) {
 		kvm_inject_gp(vcpu, 0);