diff mbox series

[RFC,v5,20/20] kvm: x86: hook in kvmi_trap_event()

Message ID 20181220182850.4579-21-alazar@bitdefender.com (mailing list archive)
State New, archived
Headers show
Series VM introspection | expand

Commit Message

Adalbert Lazăr Dec. 20, 2018, 6:28 p.m. UTC 
From: Mihai DONTU <mdontu@bitdefender.com>

Inform the guest introspection tool that the exception (from a previous
KVMI_INJECT_EXCEPTION command) was not successfully injected.

It can happen for the introspection tool to queue a pagefault but have
it overwritten by an interrupt picked up during guest reentry.
kvmi_trap_event() is used to inform the tool when such a situation has
been detected.

Signed-off-by: Mihai Donțu <mdontu@bitdefender.com>
---
 arch/x86/kvm/x86.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6d5f801e4797..64572f7ec689 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7773,6 +7773,9 @@  static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		}
 	}
 
+	if (kvmi_lost_exception(vcpu))
+		kvmi_trap_event(vcpu);
+
 	r = kvm_mmu_reload(vcpu);
 	if (unlikely(r)) {
 		goto cancel_injection;