virtio_pci: Always allow MSI/MSI-X

For virtio devices, ignore the black/white-listing depending on the PCI
bridge.  This enables MSI-X with qemu's old "82441FX" pci-bridge.

Suggested by kettenis@

diff --git a/sys/dev/pci/virtio_pci.c b/sys/dev/pci/virtio_pci.c
index c35dd7f..fbd5a38 100644 (file)
--- a/sys/dev/pci/virtio_pci.c
+++ b/sys/dev/pci/virtio_pci.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: virtio_pci.c,v 1.14 2016/07/16 12:07:21 sf Exp $      */
+/*     $OpenBSD: virtio_pci.c,v 1.15 2016/07/19 02:51:09 sf Exp $      */
 /*     $NetBSD: virtio.c,v 1.3 2011/11/02 23:05:52 njoly Exp $ */
 
 /*
@@ -213,6 +213,12 @@ virtio_pci_attach(struct device *parent, struct device *self, void *aux)
        sc->sc_config_offset = VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI;
        sc->sc_irq_type = IRQ_NO_MSIX;
 
+       /*
+        * For virtio, ignore normal MSI black/white-listing depending on the
+        * PCI bridge but enable it unconditionally.
+        */
+       pa->pa_flags |= PCI_FLAGS_MSI_ENABLED;
+
        if (pci_mapreg_map(pa, PCI_MAPREG_START, PCI_MAPREG_TYPE_IO, 0,
            &sc->sc_iot, &sc->sc_ioh, NULL, &sc->sc_iosize, 0)) {
                printf("%s: can't map i/o space\n", vsc->sc_dev.dv_xname);