commit 68eed56b2d51e66bb540062fe09f5ffd44e99f6e Author: Daniel P. Berrange Date: Sat Oct 28 14:56:51 2017 +0100 conf: add support for setting OEM strings SMBIOS data fields The OEM strings table in SMBIOS allows the vendor to pass arbitrary strings into the guest OS. This can be used as a way to pass data to an application like cloud-init, or potentially as an alternative to the kernel command line for OS installers where you can't modify the install ISO image to change the kernel args. As an example, consider if cloud-init and anaconda supported OEM strings you could use something like cloud-init:ds=nocloud-net;s=http://10.10.0.1:8000/ anaconda:method=http://dl.fedoraproject.org/pub/fedora/linux/releases/25/x86_64/os use of a application specific prefix as illustrated above is recommended, but not mandated, so that an app can reliably identify which of the many OEM strings are targetted at it. Reviewed-by: John Ferlan Signed-off-by: Daniel P. Berrange Index: libvirt-4.0.0/docs/formatdomain.html.in =================================================================== --- libvirt-4.0.0.orig/docs/formatdomain.html.in +++ libvirt-4.0.0/docs/formatdomain.html.in @@ -411,6 +411,10 @@ <entry name='version'>0B98401 Pro</entry> <entry name='serial'>W1KS427111E</entry> </baseBoard> + <oemStrings> + <entry>myappname:some arbitrary data</entry> + <entry>otherappname:more arbitrary data</entry> + </oemStrings> </sysinfo> ... @@ -498,6 +502,15 @@ validation and date format checking, all values are passed as strings to the hypervisor driver. +
oemStrings
+
+ This is block 11 of SMBIOS. This element should appear once and + can have multiple entry child elements, each providing + arbitrary string data. There are no restrictions on what data can + be provided in the entries, however, if the data is intended to be + consumed by an application in the guest, it is recommended to use + the application name as a prefix in the string. (Since 4.1.0) +
Index: libvirt-4.0.0/docs/schemas/domaincommon.rng =================================================================== --- libvirt-4.0.0.orig/docs/schemas/domaincommon.rng +++ libvirt-4.0.0/docs/schemas/domaincommon.rng @@ -4857,6 +4857,15 @@ + + + + + + + + + Index: libvirt-4.0.0/src/conf/domain_conf.c =================================================================== --- libvirt-4.0.0.orig/src/conf/domain_conf.c +++ libvirt-4.0.0/src/conf/domain_conf.c @@ -14461,6 +14461,42 @@ virSysinfoBaseBoardParseXML(xmlXPathCont return ret; } + +static int +virSysinfoOEMStringsParseXML(xmlXPathContextPtr ctxt, + virSysinfoOEMStringsDefPtr *oem) +{ + int ret = -1; + virSysinfoOEMStringsDefPtr def; + xmlNodePtr *strings = NULL; + int nstrings; + size_t i; + + nstrings = virXPathNodeSet("./entry", ctxt, &strings); + if (nstrings < 0) + return -1; + if (nstrings == 0) + return 0; + + if (VIR_ALLOC(def) < 0) + goto cleanup; + + if (VIR_ALLOC_N(def->values, nstrings) < 0) + goto cleanup; + + def->nvalues = nstrings; + for (i = 0; i < nstrings; i++) + def->values[i] = virXMLNodeContentString(strings[i]); + + *oem = def; + def = NULL; + ret = 0; + cleanup: + VIR_FREE(strings); + virSysinfoOEMStringsDefFree(def); + return ret; +} + static virSysinfoDefPtr virSysinfoParseXML(xmlNodePtr node, xmlXPathContextPtr ctxt, @@ -14519,6 +14555,17 @@ virSysinfoParseXML(xmlNodePtr node, if (virSysinfoBaseBoardParseXML(ctxt, &def->baseBoard, &def->nbaseBoard) < 0) goto error; + /* Extract system related metadata */ + if ((tmpnode = virXPathNode("./oemStrings[1]", ctxt)) != NULL) { + oldnode = ctxt->node; + ctxt->node = tmpnode; + if (virSysinfoOEMStringsParseXML(ctxt, &def->oemStrings) < 0) { + ctxt->node = oldnode; + goto error; + } + ctxt->node = oldnode; + } + cleanup: VIR_FREE(type); return def; Index: libvirt-4.0.0/src/util/virsysinfo.c =================================================================== --- libvirt-4.0.0.orig/src/util/virsysinfo.c +++ libvirt-4.0.0/src/util/virsysinfo.c @@ -108,6 +108,20 @@ void virSysinfoBaseBoardDefClear(virSysi VIR_FREE(def->location); } +void virSysinfoOEMStringsDefFree(virSysinfoOEMStringsDefPtr def) +{ + size_t i; + + if (def == NULL) + return; + + for (i = 0; i < def->nvalues; i++) + VIR_FREE(def->values[i]); + VIR_FREE(def->values); + + VIR_FREE(def); +} + /** * virSysinfoDefFree: * @def: a sysinfo structure @@ -157,6 +171,8 @@ void virSysinfoDefFree(virSysinfoDefPtr } VIR_FREE(def->memory); + virSysinfoOEMStringsDefFree(def->oemStrings); + VIR_FREE(def); } @@ -1294,6 +1310,24 @@ virSysinfoMemoryFormat(virBufferPtr buf, } } +static void +virSysinfoOEMStringsFormat(virBufferPtr buf, virSysinfoOEMStringsDefPtr def) +{ + size_t i; + + if (!def) + return; + + virBufferAddLit(buf, "\n"); + virBufferAdjustIndent(buf, 2); + for (i = 0; i < def->nvalues; i++) { + virBufferEscapeString(buf, "%s\n", + def->values[i]); + } + virBufferAdjustIndent(buf, -2); + virBufferAddLit(buf, "\n"); +} + /** * virSysinfoFormat: * @buf: buffer to append output to (may use auto-indentation) @@ -1324,6 +1358,7 @@ virSysinfoFormat(virBufferPtr buf, virSy virSysinfoBaseBoardFormat(&childrenBuf, def->baseBoard, def->nbaseBoard); virSysinfoProcessorFormat(&childrenBuf, def); virSysinfoMemoryFormat(&childrenBuf, def); + virSysinfoOEMStringsFormat(&childrenBuf, def->oemStrings); virBufferAsprintf(buf, "