Enhance the support for PCI legacy INTx interrupts and enable them in

the virtio backends.
- Add a new ioctl to export the count of pins on the I/O APIC from vmm
  to the hypervisor.
- Use pins on the I/O APIC >= 16 for PCI interrupts leaving 0-15 for
  ISA interrupts.
- Populate the MP Table with I/O interrupt entries for any PCI INTx
  interrupts.
- Create a _PRT table under the PCI root bridge in ACPI to route any
  PCI INTx interrupts appropriately.
- Track which INTx interrupts are in use per-slot so that functions
  that share a slot attempt to distribute their INTx interrupts across
  the four available pins.
- Implicitly mask INTx interrupts if either MSI or MSI-X is enabled
  and when the INTx DIS bit is set in a function's PCI command register.
  Either assert or deassert the associated I/O APIC pin when the
  state of one of those conditions changes.
- Add INTx support to the virtio backends.
- Always advertise the MSI capability in the virtio backends.

Submitted by:	neel (7)
Reviewed by:	neel
MFC after:	2 weeks

1 files changed, 1 insertions, 1 deletions

diff --git a/usr.sbin/bhyve/pci_uart.c b/usr.sbin/bhyve/pci_uart.c
index 38df83279ad8..21b93bfd696b 100644
--- a/usr.sbin/bhyve/pci_uart.c
+++ b/usr.sbin/bhyve/pci_uart.c
@@ -91,7 +91,7 @@ pci_uart_init(struct vmctx *ctx, struct pci_devinst *pi, char *opts)
 	struct uart_softc *sc;
 
 	pci_emul_alloc_bar(pi, 0, PCIBAR_IO, UART_IO_BAR_SIZE);
-	pci_lintr_request(pi, -1);
+	pci_lintr_request(pi);
 
 	/* initialize config space */
 	pci_set_cfgdata16(pi, PCIR_DEVICE, COM_DEV);