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qemu: Fix mdev checking for VFIO support

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Commit a4a39d90 added a check that checks for VFIO support with mediated
devices. The problem is that the hostdev preparing functions behave like
a fallthrough if device of that specific type doesn't exist. However,
the check for VFIO support was independent of the existence of a mdev
device which caused the guest to fail to start with any device to be
directly assigned if VFIO was disabled/unavailable in the kernel.
The proposed change first ensures that it makes sense to check for VFIO
support in the first place, and only then performs the VFIO support check
itself.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1441291

Signed-off-by: Erik Skultety <eskultet@redhat.com>
(cherry picked from commit b4c2ac8d56124428d9329643a68625465094c5a7)
This commit is contained in:
Erik Skultety 2017-04-12 10:46:35 +02:00 committed by Cole Robinson
parent 679aa1901d
commit 1cf9493e94
1 changed files with 13 additions and 4 deletions
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17
src/qemu/qemu_hostdev.c
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@ -330,11 +330,20 @@ qemuHostdevPrepareMediatedDevices(virQEMUDriverPtr driver,
int nhostdevs)
{
virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
bool supportsVFIO = qemuHostdevHostSupportsPassthroughVFIO();
size_t i;
if (!qemuHostdevHostSupportsPassthroughVFIO()) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("host doesn't support VFIO PCI interface"));
return -1;
for (i = 0; i < nhostdevs; i++) {
if (hostdevs[i]->mode == VIR_DOMAIN_HOSTDEV_MODE_SUBSYS &&
hostdevs[i]->source.subsys.type == VIR_DOMAIN_HOSTDEV_SUBSYS_TYPE_MDEV) {
if (!supportsVFIO) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Mediated host device assignment requires "
"VFIO support"));
return -1;
}
break;
}
}
return virHostdevPrepareMediatedDevices(hostdev_mgr, QEMU_DRIVER_NAME,