diff options
| -rw-r--r-- | hw/xen/xen-pvh-common.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/hw/xen/xen-pvh-common.c b/hw/xen/xen-pvh-common.c index 880e8143d7..295f920442 100644 --- a/hw/xen/xen-pvh-common.c +++ b/hw/xen/xen-pvh-common.c @@ -75,7 +75,18 @@ static void xen_create_virtio_mmio_devices(XenPVHMachineState *s) { int i; - for (i = 0; i < s->cfg.virtio_mmio_num; i++) { + /* + * We create the transports in reverse order. Since qbus_realize() + * prepends (not appends) new child buses, the decrementing loop below will + * create a list of virtio-mmio buses with increasing base addresses. + * + * When a -device option is processed from the command line, + * qbus_find_recursive() picks the next free virtio-mmio bus in forwards + * order. + * + * This is what the Xen tools expect. + */ + for (i = s->cfg.virtio_mmio_num - 1; i >= 0; i--) { hwaddr base = s->cfg.virtio_mmio.base + i * s->cfg.virtio_mmio.size; qemu_irq irq = qemu_allocate_irq(xen_set_irq, NULL, s->cfg.virtio_mmio_irq_base + i); |