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vfio/pci: Handle host oversight 

In case the end-user calls qemu with -vfio-pci option without passing
either sysfsdev or host property value, the device is interpreted as
0000:00:00.0. Let's create a specific error message to guide the end-user.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
master
Eric Auger 2016-10-17 10:58:02 -06:00 committed by Alex Williamson
parent e04cff9d97
commit 4a94626850
1 changed files with 11 additions and 0 deletions
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11
hw/vfio/pci.c
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@ -2520,6 +2520,13 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
int i, ret;
if (!vdev->vbasedev.sysfsdev) {
if (!(~vdev->host.domain || ~vdev->host.bus ||
~vdev->host.slot || ~vdev->host.function)) {
error_setg(errp, "No provided host device");
error_append_hint(errp, "Use -vfio-pci,host=DDDD:BB:DD.F "
"or -vfio-pci,sysfsdev=PATH_TO_DEVICE\n");
return;
}
vdev->vbasedev.sysfsdev =
g_strdup_printf("/sys/bus/pci/devices/%04x:%02x:%02x.%01x",
vdev->host.domain, vdev->host.bus,
@ -2828,6 +2835,10 @@ static void vfio_instance_init(Object *obj)
device_add_bootindex_property(obj, &vdev->bootindex,
"bootindex", NULL,
&pci_dev->qdev, NULL);
vdev->host.domain = ~0U;
vdev->host.bus = ~0U;
vdev->host.slot = ~0U;
vdev->host.function = ~0U;
}
static Property vfio_pci_dev_properties[] = {