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qemu: Try several network devices when looking for a default

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Up until now, the default has been rtl8139, but no check was in
place to make sure that device was actually available.

Now we try rtl8139, e1000 and virtio-net in turn, checking for
availability before using any of them: this means we have a much
better chance for the guest to be able to boot.
This commit is contained in:
Andrea Bolognani 2015-09-07 08:51:00 +02:00
parent fedbb015a9
commit 75036c69df
1 changed files with 23 additions and 3 deletions
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26
src/qemu/qemu_domain.c
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@ -1193,7 +1193,8 @@ qemuDomainDefPostParse(virDomainDefPtr def,
}
static const char *
qemuDomainDefaultNetModel(const virDomainDef *def)
qemuDomainDefaultNetModel(const virDomainDef *def,
virQEMUCapsPtr qemuCaps)
{
if (ARCH_IS_S390(def->os.arch))
return "virtio";
@ -1211,6 +1212,18 @@ qemuDomainDefaultNetModel(const virDomainDef *def)
return "lan9118";
}
/* Try several network devices in turn; each of these devices is
* less likely be supported out-of-the-box by the guest operating
* system than the previous one */
if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_RTL8139))
return "rtl8139";
else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_E1000))
return "e1000";
else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_NET))
return "virtio";
/* We've had no luck detecting support for any network device,
* but we have to return something: might as well be rtl8139 */
return "rtl8139";
}
@ -1220,18 +1233,24 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
virCapsPtr caps ATTRIBUTE_UNUSED,
void *opaque)
{
int ret = -1;
virQEMUDriverPtr driver = opaque;
virQEMUCapsPtr qemuCaps = NULL;
virQEMUDriverConfigPtr cfg = NULL;
int ret = -1;
if (driver)
cfg = virQEMUDriverGetConfig(driver);
/* This condition is actually a (temporary) hack for test suite which
* does not create capabilities cache */
if (driver && driver->qemuCapsCache)
qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache, def->emulator);
if (dev->type == VIR_DOMAIN_DEVICE_NET &&
dev->data.net->type != VIR_DOMAIN_NET_TYPE_HOSTDEV &&
!dev->data.net->model) {
if (VIR_STRDUP(dev->data.net->model,
qemuDomainDefaultNetModel(def)) < 0)
qemuDomainDefaultNetModel(def, qemuCaps)) < 0)
goto cleanup;
}
@ -1357,6 +1376,7 @@ qemuDomainDeviceDefPostParse(virDomainDeviceDefPtr dev,
ret = 0;
cleanup:
virObjectUnref(qemuCaps);
virObjectUnref(cfg);
return ret;
}