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migrate: v2: use VIR_DOMAIN_XML_MIGRATABLE when available

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In v2 migration protocol, XML is obtained by calling domainGetXMLDesc.
This includes the default USB controller in XML, which breaks migration
to older libvirt (before 0.9.2).

Commit 409b5f549530e7b3a33f4505f2cad2e26896107c
    qemu: Emit compatible XML when migrating a domain
only fixed this for v3 migration.

This patch uses the new VIR_DOMAIN_XML_MIGRATABLE flag (detected by
VIR_DRV_FEATURE_XML_MIGRATABLE) to obtain XML without the default controller,
enabling backward v2 migration.
This commit is contained in:
Ján Tomko 2012-10-19 16:58:05 +02:00 committed by Michal Privoznik
parent 508451e4ad
commit b6ab7a067f
3 changed files with 16 additions and 3 deletions
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13
src/libvirt.c
View File

@ -4620,6 +4620,7 @@ virDomainMigrateVersion2 (virDomainPtr domain,
int cookielen = 0, ret;
virDomainInfo info;
virErrorPtr orig_err = NULL;
unsigned int getxml_flags = 0;
int cancelled;
VIR_DOMAIN_DEBUG(domain,
"dconn=%p, flags=%lx, dname=%s, uri=%s, bandwidth=%lu",
@ -4646,9 +4647,15 @@ virDomainMigrateVersion2 (virDomainPtr domain,
virDispatchError(domain->conn);
return NULL;
}
dom_xml = domain->conn->driver->domainGetXMLDesc(domain,
VIR_DOMAIN_XML_SECURE |
VIR_DOMAIN_XML_UPDATE_CPU);
if (VIR_DRV_SUPPORTS_FEATURE(domain->conn->driver, domain->conn,
VIR_DRV_FEATURE_XML_MIGRATABLE)) {
getxml_flags |= VIR_DOMAIN_XML_MIGRATABLE;
} else {
getxml_flags |= VIR_DOMAIN_XML_SECURE | VIR_DOMAIN_XML_UPDATE_CPU;
}
dom_xml = domain->conn->driver->domainGetXMLDesc(domain, getxml_flags);
if (!dom_xml)
return NULL;

5
src/libvirt_internal.h
View File

@ -95,6 +95,11 @@ enum {
* messages).
*/
VIR_DRV_FEATURE_PROGRAM_KEEPALIVE = 10,
/*
* Support for VIR_DOMAIN_XML_MIGRATABLE flag in domainGetXMLDesc
*/
VIR_DRV_FEATURE_XML_MIGRATABLE = 11,
};

1
src/qemu/qemu_driver.c
View File

@ -1130,6 +1130,7 @@ qemudSupportsFeature (virConnectPtr conn ATTRIBUTE_UNUSED, int feature)
case VIR_DRV_FEATURE_MIGRATE_CHANGE_PROTECTION:
case VIR_DRV_FEATURE_FD_PASSING:
case VIR_DRV_FEATURE_TYPED_PARAM_STRING:
case VIR_DRV_FEATURE_XML_MIGRATABLE:
return 1;
default:
return 0;