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qemu: implement virtiofs hotplug

Browse Source 
https://bugzilla.redhat.com/show_bug.cgi?id=1897708

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Ján Tomko 2021-10-05 16:25:38 +02:00
parent c30064a94c
commit b987873034
2 changed files with 107 additions and 1 deletions
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9
src/qemu/qemu_driver.c
View File

@ -6945,8 +6945,15 @@ qemuDomainAttachDeviceLive(virDomainObj *vm,
}
break;
case VIR_DOMAIN_DEVICE_NONE:
case VIR_DOMAIN_DEVICE_FS:
ret = qemuDomainAttachFSDevice(driver, vm, dev->data.fs);
if (ret == 0) {
alias = dev->data.fs->info.alias;
dev->data.fs = NULL;
}
break;
case VIR_DOMAIN_DEVICE_NONE:
case VIR_DOMAIN_DEVICE_SOUND:
case VIR_DOMAIN_DEVICE_VIDEO:
case VIR_DOMAIN_DEVICE_GRAPHICS:

99
src/qemu/qemu_hotplug.c
View File

@ -35,6 +35,7 @@
#include "qemu_security.h"
#include "qemu_block.h"
#include "qemu_snapshot.h"
#include "qemu_virtiofs.h"
#include "domain_audit.h"
#include "netdev_bandwidth_conf.h"
#include "domain_nwfilter.h"
@ -3419,6 +3420,104 @@ qemuDomainAttachVsockDevice(virQEMUDriver *driver,
}
int
qemuDomainAttachFSDevice(virQEMUDriver *driver,
virDomainObj *vm,
virDomainFSDef *fs)
{
qemuDomainObjPrivate *priv = vm->privateData;
virDomainDeviceDef dev = { VIR_DOMAIN_DEVICE_FS,
{ .fs = fs } };
g_autoptr(virDomainChrSourceDef) chardev = NULL;
g_autoptr(virJSONValue) devprops = NULL;
virErrorPtr origErr = NULL;
bool releaseaddr = false;
bool chardevAdded = false;
bool started = false;
g_autofree char *charAlias = NULL;
int ret = -1;
if (fs->fsdriver != VIR_DOMAIN_FS_DRIVER_TYPE_VIRTIOFS) {
virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
_("only virtiofs filesystems can be hotplugged"));
return -1;
}
if (qemuDomainEnsureVirtioAddress(&releaseaddr, vm, &dev) < 0)
return -1;
if (qemuAssignDeviceFSAlias(vm->def, fs) < 0)
goto cleanup;
chardev = virDomainChrSourceDefNew(priv->driver->xmlopt);
chardev->type = VIR_DOMAIN_CHR_TYPE_UNIX;
chardev->data.nix.path = qemuDomainGetVHostUserFSSocketPath(priv, fs);
charAlias = qemuDomainGetVhostUserChrAlias(fs->info.alias);
if (qemuBuildVHostUserFsDevProps(fs, vm->def, charAlias, priv) < 0)
goto cleanup;
if (!fs->sock) {
if (qemuVirtioFSPrepareDomain(driver, fs) < 0)
goto cleanup;
if (qemuVirtioFSStart(driver, vm, fs) < 0)
goto cleanup;
started = true;
if (qemuVirtioFSSetupCgroup(vm, fs, priv->cgroup) < 0)
goto cleanup;
}
qemuDomainObjEnterMonitor(driver, vm);
if (qemuMonitorAttachCharDev(priv->mon, charAlias, chardev) < 0)
goto exit_monitor;
chardevAdded = true;
if (qemuDomainAttachExtensionDevice(priv->mon, &fs->info) < 0)
goto exit_monitor;
if (qemuMonitorAddDeviceProps(priv->mon, &devprops) < 0) {
ignore_value(qemuDomainDetachExtensionDevice(priv->mon, &fs->info));
goto exit_monitor;
}
if (qemuDomainObjExitMonitor(driver, vm) < 0) {
releaseaddr = false;
goto cleanup;
}
VIR_APPEND_ELEMENT_COPY(vm->def->fss, vm->def->nfss, fs);
ret = 0;
audit:
virDomainAuditFS(vm, NULL, fs, "attach", ret == 0);
cleanup:
if (ret < 0) {
virErrorPreserveLast(&origErr);
if (releaseaddr)
qemuDomainReleaseDeviceAddress(vm, &fs->info);
if (started)
qemuVirtioFSStop(driver, vm, fs);
virErrorRestore(&origErr);
}
return ret;
exit_monitor:
virErrorPreserveLast(&origErr);
if (chardevAdded)
ignore_value(qemuMonitorDetachCharDev(priv->mon, charAlias));
if (qemuDomainObjExitMonitor(driver, vm) < 0)
releaseaddr = false;
virErrorRestore(&origErr);
goto audit;
}
int
qemuDomainAttachLease(virQEMUDriver *driver,
virDomainObj *vm,