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qemu: avoid double reservation of PCI address for interface type='hostdev'

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Commit 01ca4010d8 (libvirt v5.1.0) moved address reservation for
hotplugged interface devices up to an earlier point in
qemuDomainAttachNetDevice(), because that function calls
qemuDomainSupportsNicdev() (in the case of
VIR_DOMAIN_NET_TYPE_VHOSTUSER), and qemuDomainSupportsNicdev() needs
to know the address type (for ARM machinetypes) and returns incorrect
results when the address type is "none".

This bugfix unfortunately caused a regression, because it also made PCI
address reservation happen before we noticed that the device was a
*hostdev* interface. Those interfaces are hotplugged by just calling
out to qemuDomainAttachHostdevDevice() - that function would then also
attempt to reserve the *same PCI address* that had just been reserved
in qemuDomainAttachNetDevice().

The solution is to move the bit of code that short-circuits out to
virDomainHostdevAttach() up *even earlier* so that no PCI address has
been allocated by the time it's called.

https://bugzilla.redhat.com/show_bug.cgi?id=1744523
Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Andrea Bolognani <abologna@redhat.com>
This commit is contained in:
Laine Stump 2019-10-19 01:58:07 -04:00
parent cf915455e4
commit 47a7b8a96b
1 changed files with 15 additions and 11 deletions
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26
src/qemu/qemu_hotplug.c
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@ -1181,6 +1181,17 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
if (qemuAssignDeviceNetAlias(vm->def, net, -1) < 0)
goto cleanup;
if (actualType == VIR_DOMAIN_NET_TYPE_HOSTDEV) {
/* This is really a "smart hostdev", so it should be attached
* as a hostdev (the hostdev code will reach over into the
* netdev-specific code as appropriate), then also added to
* the nets list (see cleanup:) if successful.
*/
ret = qemuDomainAttachHostDevice(driver, vm,
virDomainNetGetActualHostdev(net));
goto cleanup;
}
if (qemuDomainIsS390CCW(vm->def) &&
net->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI &&
virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_CCW)) {
@ -1260,17 +1271,6 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
goto cleanup;
break;
case VIR_DOMAIN_NET_TYPE_HOSTDEV:
/* This is really a "smart hostdev", so it should be attached
* as a hostdev (the hostdev code will reach over into the
* netdev-specific code as appropriate), then also added to
* the nets list (see cleanup:) if successful.
*/
ret = qemuDomainAttachHostDevice(driver, vm,
virDomainNetGetActualHostdev(net));
goto cleanup;
break;
case VIR_DOMAIN_NET_TYPE_VHOSTUSER:
queueSize = net->driver.virtio.queues;
if (!queueSize)
@ -1313,6 +1313,10 @@ qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
}
break;
case VIR_DOMAIN_NET_TYPE_HOSTDEV:
/* hostdev interfaces were handled earlier in this function */
break;
case VIR_DOMAIN_NET_TYPE_SERVER:
case VIR_DOMAIN_NET_TYPE_CLIENT:
case VIR_DOMAIN_NET_TYPE_MCAST: