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virsh: Introduce update-memory-device command
New 'update-memory-device' command is introduced which aims on making it user friendly to change <memory/> device. So far I just need to change <requested/> so I'm introducing --requested-size only; but the idea is that this is extensible for other cases too. For instance, want to change <myElement/>? A new --my-element argument can be easily introduced. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik
parent
b1c3b5dfec
commit
f72e4edf50
@ -4919,6 +4919,36 @@ results as some fields may be autogenerated and thus match devices other than
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expected.
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update-memory-device
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--------------------
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**Syntax:**
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::
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update-memory-device domain [--print-xml] [[--alias alias] | [--node node]]
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[[--live] [--config] | [--current]]
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[--requested-size size]
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This command finds ``<memory/>`` device inside given *domain*, changes
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requested values and passes updated device XML to daemon. If *--print-xml* is
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specified then the device is not changed, but the updated device XML is printed
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to stdout. If there are more than one ``<memory/>`` devices in *domain* use
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*--alias* or *--node* to select the desired one.
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If *--live* is specified, affect a running domain.
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If *--config* is specified, affect the next startup of a persistent guest.
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If *--current* is specified, it is equivalent to either *--live* or
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*--config*, depending on the current state of the guest.
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Both *--live* and *--config* flags may be given, but *--current* is
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exclusive. Not specifying any flag is the same as specifying *--current*.
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If *--requested-size* is specified then ``<requested/>`` under memory target is
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changed to requested *size* (as scaled integer, see ``NOTES`` above). It
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defaults to kibibytes if no suffix is provided. The option is valid only for
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``virtio-mem`` memory device model.
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change-media
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------------
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@ -8927,6 +8927,161 @@ cmdSetmaxmem(vshControl *ctl, const vshCmd *cmd)
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return true;
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}
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/*
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* "update-memory-device" command
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*/
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static const vshCmdInfo info_update_memory_device[] = {
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{.name = "help",
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.data = N_("update memory device of a domain")
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},
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{.name = "desc",
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.data = N_("Update values of a memory device of a domain")
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},
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{.name = NULL}
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};
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static const vshCmdOptDef opts_update_memory_device[] = {
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VIRSH_COMMON_OPT_DOMAIN_FULL(0),
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VIRSH_COMMON_OPT_DOMAIN_CONFIG,
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VIRSH_COMMON_OPT_DOMAIN_LIVE,
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VIRSH_COMMON_OPT_DOMAIN_CURRENT,
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{.name = "print-xml",
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.type = VSH_OT_BOOL,
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.help = N_("print updated memory device XML instead of executing the change")
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},
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{.name = "alias",
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.type = VSH_OT_STRING,
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.completer = virshDomainDeviceAliasCompleter,
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.help = N_("memory device alias")
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},
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{.name = "node",
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.type = VSH_OT_INT,
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.help = N_("memory device target node")
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},
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{.name = "requested-size",
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.type = VSH_OT_INT,
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.help = N_("new value of <requested/> size, as scaled integer (default KiB)")
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},
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{.name = NULL}
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};
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static int
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virshGetUpdatedMemoryXML(char **updatedMemoryXML,
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vshControl *ctl,
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const vshCmd *cmd,
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virDomainPtr dom,
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unsigned int flags)
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{
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const char *alias = NULL;
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bool nodeOpt = false;
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unsigned int node = 0;
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g_autoptr(xmlDoc) doc = NULL;
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g_autoptr(xmlXPathContext) ctxt = NULL;
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g_autofree char *xpath = NULL;
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int nmems;
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g_autofree xmlNodePtr *mems = NULL;
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unsigned int domainXMLFlags = 0;
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if (flags & VIR_DOMAIN_AFFECT_CONFIG)
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domainXMLFlags |= VIR_DOMAIN_XML_INACTIVE;
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if (virshDomainGetXMLFromDom(ctl, dom, domainXMLFlags, &doc, &ctxt) < 0)
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return -1;
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nodeOpt = vshCommandOptBool(cmd, "node");
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if (vshCommandOptStringReq(ctl, cmd, "alias", &alias) < 0 ||
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vshCommandOptUInt(ctl, cmd, "node", &node) < 0) {
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return -1;
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}
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if (nodeOpt) {
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xpath = g_strdup_printf("/domain/devices/memory[./target/node='%u']", node);
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} else if (alias) {
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xpath = g_strdup_printf("/domain/devices/memory[./alias/@name='%s']", alias);
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} else {
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xpath = g_strdup("/domain/devices/memory");
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}
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nmems = virXPathNodeSet(xpath, ctxt, &mems);
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if (nmems < 0) {
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vshSaveLibvirtError();
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return -1;
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} else if (nmems == 0) {
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vshError(ctl, _("no memory device found"));
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return -1;
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} else if (nmems > 1) {
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vshError(ctl, _("multiple memory devices found, use --alias or --node to select one"));
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return -1;
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}
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ctxt->node = mems[0];
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if (vshCommandOptBool(cmd, "requested-size")) {
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xmlNodePtr requestedSizeNode;
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g_autofree char *kibibytesStr = NULL;
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unsigned long long bytes = 0;
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unsigned long kibibytes = 0;
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if (vshCommandOptScaledInt(ctl, cmd, "requested-size", &bytes, 1024, ULLONG_MAX) < 0)
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return -1;
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kibibytes = VIR_DIV_UP(bytes, 1024);
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requestedSizeNode = virXPathNode("./target/requested", ctxt);
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if (!requestedSizeNode) {
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vshError(ctl, _("virtio-mem device is missing <requested/>"));
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return -1;
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}
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kibibytesStr = g_strdup_printf("%lu", kibibytes);
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xmlNodeSetContent(requestedSizeNode, BAD_CAST kibibytesStr);
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}
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if (!(*updatedMemoryXML = virXMLNodeToString(doc, mems[0]))) {
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vshSaveLibvirtError();
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return -1;
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}
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return 0;
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}
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static bool
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cmdUpdateMemoryDevice(vshControl *ctl, const vshCmd *cmd)
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{
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g_autoptr(virshDomain) dom = NULL;
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bool config = vshCommandOptBool(cmd, "config");
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bool live = vshCommandOptBool(cmd, "live");
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bool current = vshCommandOptBool(cmd, "current");
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g_autofree char *updatedMemoryXML = NULL;
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unsigned int flags = VIR_DOMAIN_AFFECT_CURRENT;
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VSH_EXCLUSIVE_OPTIONS_VAR(current, live);
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VSH_EXCLUSIVE_OPTIONS_VAR(current, config);
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VSH_EXCLUSIVE_OPTIONS("node", "alias");
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if (config)
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flags |= VIR_DOMAIN_AFFECT_CONFIG;
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if (live)
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flags |= VIR_DOMAIN_AFFECT_LIVE;
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if (!(dom = virshCommandOptDomain(ctl, cmd, NULL)))
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return false;
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if (virshGetUpdatedMemoryXML(&updatedMemoryXML, ctl, cmd, dom, flags) < 0)
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return false;
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if (vshCommandOptBool(cmd, "print-xml")) {
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vshPrint(ctl, "%s", updatedMemoryXML);
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} else {
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if (virDomainUpdateDeviceFlags(dom, updatedMemoryXML, flags) < 0)
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return false;
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}
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return true;
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}
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/*
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* "memtune" command
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*/
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@ -14676,6 +14831,12 @@ const vshCmdDef domManagementCmds[] = {
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.info = info_update_device,
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.flags = 0
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},
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{.name = "update-memory-device",
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.handler = cmdUpdateMemoryDevice,
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.opts = opts_update_memory_device,
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.info = info_update_memory_device,
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.flags = 0
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},
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{.name = "vcpucount",
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.handler = cmdVcpucount,
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.opts = opts_vcpucount,
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