Re: [libvirt] [PATCH 05/20] conf: Add support for shmem role

Role controls how the domain behaves on migration. Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- docs/formatdomain.html.in | 10 +++++- docs/schemas/domaincommon.rng | 8 +++++ src/conf/domain_conf.c | 39 ++++++++++++++++++++++- src/conf/domain_conf.h | 11 +++++++ tests/qemuxml2argvdata/qemuxml2argv-shmem.xml | 4 +-- tests/qemuxml2xmloutdata/qemuxml2xmlout-shmem.xml | 4 +-- 6 files changed, 70 insertions(+), 6 deletions(-) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index f48a4d8b813f..f4d08959c787 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in

@@ -6764,6 +6764,14 @@ qemu-kvm -net nic,model=? /dev/null <dd> The <code>shmem</code> element has one mandatory attribute, <code>name</code> to identify the shared memory. + Optional attribute <code>role</code> can be set to values + "master" or "peer". The former will mean that upon migration, + the data in the shared memory is migrated with the domain. + There should be only one "master" per shared memory object. + Migration with "peer" role is disabled. If migration of such + domain is required, the shmem device needs to be unplugged + before migration and plugged in at the destination upon + successful migration.

</dd> <dt><code>size</code></dt> <dd>

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 97cb3de95529..2ccc10515f30 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c

@@ -12201,6 +12206,23 @@ virDomainShmemDefParseXML(xmlNodePtr node, ctxt->node = node; + if (!(def->name = virXMLPropString(node, "name"))) { + virReportError(VIR_ERR_XML_ERROR, "%s", + _("shmem element must contain 'name' attribute")); + goto cleanup; + }

+ + tmp = virXMLPropString(node, "role"); + if (tmp) { + if ((def->role = virDomainShmemRoleTypeFromString(tmp)) <= 0) { + virReportError(VIR_ERR_XML_ERROR, + _("Unknown shmem role type '%s'"), tmp); + goto cleanup; + } + + VIR_FREE(tmp); + } + tmp = virXPathString("string(./model/@type)", ctxt); if (tmp) { /* If there's none, we will automatically have the first one @@ -18704,6 +18726,15 @@ virDomainShmemDefCheckABIStability(virDomainShmemDefPtr src, return false; } + if (src->role != dst->role) { + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, + _("Target shared memory role '%s' does not match " + "source role '%s'"), + virDomainShmemRoleTypeToString(dst->role), + virDomainShmemRoleTypeToString(src->role)); + return false; + }

+ if (src->model != dst->model) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("Target shared memory model '%s' does not match " @@ -21790,8 +21821,14 @@ virDomainShmemDefFormat(virBufferPtr buf, virDomainShmemDefPtr def, unsigned int flags) { - virBufferEscapeString(buf, "<shmem name='%s'>\n", def->name); + virBufferEscapeString(buf, "<shmem name='%s'", def->name); + if (def->role) { + virBufferEscapeString(buf, " role='%s'", + virDomainShmemRoleTypeToString(def->role)); + } + + virBufferAddLit(buf, ">\n"); virBufferAdjustIndent(buf, 2); virBufferAsprintf(buf, "<model type='%s'/>\n",