[libvirt] [PATCH 16/18] Add XML config for resource partitions

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- docs/formatdomain.html.in | 26 ++++++++++ docs/schemas/domaincommon.rng | 12 +++++ src/conf/domain_conf.c | 78 ++++++++++++++++++++++++++++ src/conf/domain_conf.h | 7 +++ tests/domainschemadata/domain-lxc-simple.xml | 3 ++ 5 files changed, 126 insertions(+) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index cf382e8..3e7ab65 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -716,6 +716,32 @@ </dl> + <h3><a name="resPartition">Resource partitioning</a></h3> + + <p> + Hypervisors may allow for virtual machines to be placed into + resource partitions, potentially with nesting of said partitions. + The <code>resource</code> element groups together configuration + related to resource partitioning. It currently supports a child + element <code>partition</code> whose content defines the path + of the resource partition in which to place the domain. If no + partition is listed, then the domain will be placed in a default + partition. + </p> +<pre> + ... + &lt;resource&gt; + &lt;partition&gt;/virtualmachines/production&lt;/partition&gt; + &lt;/resource&gt; + ... +</pre> + + <p> + Resource partitions are currently supported by the QEMU and + LXC drivers, which map partition paths onto cgroups directories, + in all mounted controllers. <span class="since">Since 1.0.5</pan> + </p> + <h3><a name="elementsCPU">CPU model and topology</a></h3> <p> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index 63ba7d1..296f8f9 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -537,6 +537,10 @@ <optional> <ref name="numatune"/> </optional> + + <optional> + <ref name="respartition"/> + </optional> </interleave> </define> @@ -680,6 +684,14 @@ </element> </define> + <define name="respartition"> + <element name="resource"> + <element name="partition"> + <ref name="absFilePath"/> + </element> + </element> + </define> + <define name="clock"> <optional> <element name="clock"> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index cc26f21..d44bb5d 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -1748,6 +1748,18 @@ virDomainVcpuPinDefArrayFree(virDomainVcpuPinDefPtr *def, VIR_FREE(def); } + +void +virDomainResourceDefFree(virDomainResourceDefPtr resource) +{ + if (!resource) + return; + + VIR_FREE(resource->partition); + VIR_FREE(resource); +} + + void virDomainDefFree(virDomainDefPtr def) { unsigned int i; @@ -1755,6 +1767,8 @@ void virDomainDefFree(virDomainDefPtr def) if (!def) return; + virDomainResourceDefFree(def->resource); + /* hostdevs must be freed before nets (or any future "intelligent * hostdevs") because the pointer to the hostdev is really * pointing into the middle of the higher level device's object, @@ -9378,6 +9392,37 @@ cleanup: } +static virDomainResourceDefPtr +virDomainResourceDefParse(xmlNodePtr node, + xmlXPathContextPtr ctxt) +{ + virDomainResourceDefPtr def = NULL; + xmlNodePtr tmp = ctxt->node; + + ctxt->node = node; + + if (VIR_ALLOC(def) < 0) { + virReportOOMError(); + goto error; + } + + /* Find out what type of virtualization to use */ + if (!(def->partition = virXPathString("string(./partition)", ctxt))) { + virReportError(VIR_ERR_INTERNAL_ERROR, + "%s", _("missing resource partition attribute")); + goto error; + } + + ctxt->node = tmp; + return def; + +error: + ctxt->node = tmp; + virDomainResourceDefFree(def); + return NULL; +} + + static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps, virDomainXMLConfPtr xmlconf, @@ -9948,6 +9993,25 @@ virDomainDefParseXML(virCapsPtr caps, } VIR_FREE(nodes); + /* Extract numatune if exists. */ + if ((n = virXPathNodeSet("./resource", ctxt, &nodes)) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, + "%s", _("cannot extract resource nodes")); + goto error; + } + + if (n > 1) { + virReportError(VIR_ERR_XML_ERROR, "%s", + _("only one resource element is supported")); + VIR_FREE(nodes); + goto error; + } + + if (n && + !(def->resource = virDomainResourceDefParse(nodes[0], ctxt))) + goto error; + VIR_FREE(nodes); + if ((n = virXPathNodeSet("./features/*", ctxt, &nodes)) < 0) goto error; @@ -14605,6 +14669,17 @@ virDomainIsAllVcpupinInherited(virDomainDefPtr def) } } + +static void +virDomainResourceDefFormat(virBufferPtr buf, + virDomainResourceDefPtr def) +{ + virBufferAddLit(buf, " <resource>\n"); + virBufferEscapeString(buf, " <partition>%s</partition>\n", def->partition); + virBufferAddLit(buf, " </resource>\n"); +} + + #define DUMPXML_FLAGS \ (VIR_DOMAIN_XML_SECURE | \ VIR_DOMAIN_XML_INACTIVE | \ @@ -14873,6 +14948,9 @@ virDomainDefFormatInternal(virDomainDefPtr def, virBufferAddLit(buf, " </numatune>\n"); } + if (def->resource) + virDomainResourceDefFormat(buf, def->resource); + if (def->sysinfo) virDomainSysinfoDefFormat(buf, def->sysinfo); diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index edddf25..b05cd34 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -1735,6 +1735,11 @@ struct _virDomainRNGDef { void virBlkioDeviceWeightArrayClear(virBlkioDeviceWeightPtr deviceWeights, int ndevices); +typedef struct _virDomainResourceDef virDomainResourceDef; +typedef virDomainResourceDef *virDomainResourceDefPtr; +struct _virDomainResourceDef { + char *partition; +}; /* * Guest VM main configuration @@ -1786,6 +1791,7 @@ struct _virDomainDef { } cputune; virNumaTuneDef numatune; + virDomainResourceDefPtr resource; /* These 3 are based on virDomainLifeCycleAction enum flags */ int onReboot; @@ -1976,6 +1982,7 @@ virDomainObjPtr virDomainObjListFindByName(const virDomainObjListPtr doms, bool virDomainObjTaint(virDomainObjPtr obj, enum virDomainTaintFlags taint); +void virDomainResourceDefFree(virDomainResourceDefPtr resource); void virDomainGraphicsDefFree(virDomainGraphicsDefPtr def); void virDomainInputDefFree(virDomainInputDefPtr def); void virDomainDiskDefFree(virDomainDiskDefPtr def); diff --git a/tests/domainschemadata/domain-lxc-simple.xml b/tests/domainschemadata/domain-lxc-simple.xml index e61434f..56a0117 100644 --- a/tests/domainschemadata/domain-lxc-simple.xml +++ b/tests/domainschemadata/domain-lxc-simple.xml @@ -5,6 +5,9 @@ <type>exe</type> <init>/sh</init> </os> + <resource> + <partition>/virtualmachines</partition> + </resource> <memory unit='KiB'>500000</memory> <devices> <filesystem type='mount'> -- 1.8.1.4