[RFC PATCH 12/19] kvm: x86: Hook in kvmi_trap_event()

[Adalbert Lazar <alazar@bitdefender.com>]

From: Mihai Dontu <mdontu@bitdefender.com>

Inform the guest introspection tool that a trap was 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 Dontu <mdontu@bitdefender.com>
---
 arch/x86/kvm/x86.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3a50710629b5..29d07f8aa7fa 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6928,6 +6928,30 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
 	}
 
+	if (atomic_read(&vcpu->arch.next_interrupt_enabled)) {
+		if (vcpu->arch.exception.pending) {
+			unsigned int nr = vcpu->arch.exception.nr;
+			unsigned int type;
+
+			if (kvm_exception_is_soft(nr))
+				type = INTR_TYPE_SOFT_EXCEPTION;
+			else
+				type = INTR_TYPE_HARD_EXCEPTION;
+			kvmi_trap_event(vcpu, nr, type,
+					vcpu->arch.exception.error_code,
+					vcpu->arch.cr2);
+		} else if (vcpu->arch.interrupt.pending) {
+			unsigned int nr = vcpu->arch.interrupt.nr;
+			unsigned int type;
+
+			if (vcpu->arch.interrupt.soft)
+				type = INTR_TYPE_SOFT_INTR;
+			else
+				type = INTR_TYPE_EXT_INTR;
+			kvmi_trap_event(vcpu, nr, type, 0, vcpu->arch.cr2);
+		}
+	}
+
 	kvm_x86_ops->run(vcpu);
 
 	/*
-- 
2.12.2