Re: [libvirt] [PATCH] Fix libvirtd restart for domains with PCI passthrough devices

When libvirtd shuts down, it places a <state/> tag in the XML state file it writes out for guests with PCI passthrough devices. For devices that are attached at bootup time, the state tag is empty. However, at libvirtd startup time, it ignores anything with a <state/> tag in the XML, effectively hiding the guest.

I can think of at least 3 ways to fix this: 1) Don't throw an error on "unknown" tags in virDomainHostdevSubsysPciDefParseXML(). 2) Have virDomainLoadAllConfigs() pass the VIR_DOMAIN_XML_INTERNAL_STATUS flag when parsing the domain XML. 3) Remove the check for VIR_DOMAIN_XML_INTERNAL_STATUS when parsing the XML. I chose approach 3). My reasoning for this is that the <state> tag is a legitimate part of the XML, so we should always offer to parse it. This fixes the problem with reconnecting to domains that have PCI passthrough devices.

Signed-off-by: Chris Lalancette <clalance(a)redhat.com&gt; --- src/conf/domain_conf.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 74c2337..595c46c 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -2876,7 +2876,7 @@ static int virDomainHostdevSubsysPciDefParseXML(virConnectPtr conn, const xmlNodePtr node, virDomainHostdevDefPtr def, - int flags) { + int flags ATTRIBUTE_UNUSED) { int ret = -1; xmlNodePtr cur; @@ -2890,8 +2890,7 @@ virDomainHostdevSubsysPciDefParseXML(virConnectPtr conn, if (virDomainDevicePCIAddressParseXML(conn, cur, addr) < 0) goto out; - } else if ((flags & VIR_DOMAIN_XML_INTERNAL_STATUS) && - xmlStrEqual(cur->name, BAD_CAST "state")) { + } else if (xmlStrEqual(cur->name, BAD_CAST "state")) { /* Legacy back-compat. Don't add any more attributes here */ char *devaddr = virXMLPropString(cur, "devaddr"); if (devaddr &&