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qemu: hotplug: Extract code for unplugging fdsets

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The code unplugging the fdset for a 'vdpa' network device can be later
reused. Extract it into 'qemuHotplugRemoveFDSet'.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2022-01-11 16:15:34 +01:00
parent bfb79de3d3
commit a4449fb158
1 changed files with 39 additions and 30 deletions
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69
src/qemu/qemu_hotplug.c
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@ -137,6 +137,44 @@ qemuDomainDeleteDevice(virDomainObj *vm,
}
/**
* qemuHotplugRemoveFDSet:
* @mon: monitor object
* @fdname: the 'opaque' string used as a name for the FD
*
* Looks up the 'fdset' by looking for a fd inside one of the fdsets which
* has the opaque string set to @fdname. Removes the whole fdset which contains
* the fd.
*
* Errors are logged, but this is a best-effort hot-unplug cleanup helper so it's
* pointless to return a value.
*/
static void
qemuHotplugRemoveFDSet(qemuMonitor *mon,
const char *fdname)
{
g_autoptr(qemuMonitorFdsets) fdsets = NULL;
size_t i;
if (qemuMonitorQueryFdsets(mon, &fdsets) < 0)
return;
for (i = 0; i < fdsets->nfdsets; i++) {
qemuMonitorFdsetInfo *set = &fdsets->fdsets[i];
size_t j;
for (j = 0; j < set->nfds; j++) {
qemuMonitorFdsetFdInfo *fdinfo = &set->fds[j];
if (STREQ_NULLABLE(fdinfo->opaque, fdname)) {
ignore_value(qemuMonitorRemoveFdset(mon, set->id));
return;
}
}
}
}
static int
qemuDomainDetachZPCIDevice(qemuMonitor *mon,
virDomainDeviceInfo *info)
@ -4761,38 +4799,9 @@ qemuDomainRemoveNetDevice(virQEMUDriver *driver,
*/
}
} else if (actualType == VIR_DOMAIN_NET_TYPE_VDPA) {
int vdpafdset = -1;
g_autoptr(qemuMonitorFdsets) fdsets = NULL;
/* query qemu for which fdset is associated with the fd that we passed
* to qemu via 'add-fd' for this vdpa device. If we don't remove the
* fd, qemu will keep it open */
if (qemuMonitorQueryFdsets(priv->mon, &fdsets) == 0) {
for (i = 0; i < fdsets->nfdsets && vdpafdset < 0; i++) {
size_t j;
qemuMonitorFdsetInfo *set = &fdsets->fdsets[i];
for (j = 0; j < set->nfds; j++) {
qemuMonitorFdsetFdInfo *fdinfo = &set->fds[j];
if (STREQ_NULLABLE(fdinfo->opaque, net->data.vdpa.devicepath)) {
vdpafdset = set->id;
break;
}
}
}
}
if (vdpafdset < 0) {
VIR_WARN("Cannot determine fdset for vdpa device");
} else {
if (qemuMonitorRemoveFdset(priv->mon, vdpafdset) < 0) {
/* if it fails, there's not much we can do... just carry on */
VIR_WARN("failed to close vdpa device");
}
}
qemuHotplugRemoveFDSet(priv->mon, net->data.vdpa.devicepath);
}
qemuDomainObjExitMonitor(driver, vm);
if (QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp)