Add an ioctl to assert and deassert an ioapic pin atomically. This will be used

to inject edge triggered legacy interrupts into the guest.

Start using the new API in device models that use edge triggered interrupts:
viz. the 8254 timer and the LPC/uart device emulation.

Submitted by:	Tycho Nightingale (tycho.nightingale@pluribusnetworks.com)

2 files changed, 12 insertions, 0 deletions

diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index 5ece80b..85b1069 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -419,6 +419,17 @@ vm_ioapic_deassert_irq(struct vmctx *ctx, int irq)
 }
 
 int
+vm_ioapic_pulse_irq(struct vmctx *ctx, int irq)
+{
+	struct vm_ioapic_irq ioapic_irq;
+
+	bzero(&ioapic_irq, sizeof(struct vm_ioapic_irq));
+	ioapic_irq.irq = irq;
+
+	return (ioctl(ctx->fd, VM_IOAPIC_PULSE_IRQ, &ioapic_irq));
+}
+
+int
 vm_inject_nmi(struct vmctx *ctx, int vcpu)
 {
 	struct vm_nmi vmnmi;
diff --git a/lib/libvmmapi/vmmapi.h b/lib/libvmmapi/vmmapi.h
index c9a2a09..8eaea29 100644
--- a/lib/libvmmapi/vmmapi.h
+++ b/lib/libvmmapi/vmmapi.h
@@ -69,6 +69,7 @@ int	vm_inject_event2(struct vmctx *ctx, int vcpu, enum vm_event_type type,
 int	vm_lapic_irq(struct vmctx *ctx, int vcpu, int vector);
 int	vm_ioapic_assert_irq(struct vmctx *ctx, int irq);
 int	vm_ioapic_deassert_irq(struct vmctx *ctx, int irq);
+int	vm_ioapic_pulse_irq(struct vmctx *ctx, int irq);
 int	vm_inject_nmi(struct vmctx *ctx, int vcpu);
 int	vm_capability_name2type(const char *capname);
 const char *vm_capability_type2name(int type);