[RFC PATCH v4 18/18] kvm: x86: hook in kvmi_trap_event()

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From: Adalbert Lazar <alazar@xxxxxxxxxxxxxxx>

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

It can happen for the 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 of all pending traps giving it a chance to
determine if it should try again later.

Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
---
 arch/x86/kvm/x86.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 9a3c315b13e4..b3825658528a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7058,6 +7058,15 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		goto cancel_injection;
 	}
 
+	if (kvmi_lost_exception(vcpu)) {
+		local_irq_enable();
+		preempt_enable();
+		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
+		r = 1;
+		kvmi_trap_event(vcpu);
+		goto cancel_injection;
+	}
+
 	kvm_load_guest_xcr0(vcpu);
 
 	if (req_immediate_exit) {




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