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[RFC,14/19] kvm: x86: Hook in kvmi_xsetbv_event()

Message ID 20170616134348.17725-15-alazar@bitdefender.com (mailing list archive)
State New, archived
Headers show

Commit Message

Adalbert Lazăr June 16, 2017, 1:43 p.m. UTC 
From: Mihai Dontu <mdontu@bitdefender.com>

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

Signed-off-by: Mihai Dontu <mdontu@bitdefender.com>
---
 arch/x86/kvm/x86.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5298f93412db..248fb7e99423 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -728,6 +728,10 @@  static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 		if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
 			return 1;
 	}
+
+	if (xcr0 != old_xcr0)
+		kvmi_xsetbv_event(vcpu, xcr);
+
 	vcpu->arch.xcr0 = xcr0;
 
 	if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)