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qemu: Pass qemuCaps to qemuMigrationCookieXMLParse

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Since qemuDomainDefPostParse callback requires qemuCaps, we need to make
sure it gets the capabilities stored in the domain's private data if the
domain is running. Passing NULL may cause QEMU capabilities probing to
be triggered in case QEMU binary changed in the meantime. When this
happens while a running domain object is locked, QMP event delivered to
the domain before QEMU capabilities probing finishes will deadlock the
event loop.

This patch fixes all paths leading to qemuMigrationCookieXMLParse.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jiri Denemark 2019-08-06 12:31:45 +02:00
parent 6e7c33dad7
commit bf15b145ec
1 changed files with 5 additions and 2 deletions
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7
src/qemu/qemu_migration_cookie.c
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@ -1197,6 +1197,7 @@ qemuMigrationCookieCapsXMLParse(xmlXPathContextPtr ctxt)
static int
qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
virQEMUDriverPtr driver,
virQEMUCapsPtr qemuCaps,
xmlDocPtr doc,
xmlXPathContextPtr ctxt,
unsigned int flags)
@ -1338,7 +1339,7 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
goto error;
}
mig->persistent = virDomainDefParseNode(doc, nodes[0],
caps, driver->xmlopt, NULL,
caps, driver->xmlopt, qemuCaps,
VIR_DOMAIN_DEF_PARSE_INACTIVE |
VIR_DOMAIN_DEF_PARSE_ABI_UPDATE_MIGRATION |
VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE);
@ -1391,6 +1392,7 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
static int
qemuMigrationCookieXMLParseStr(qemuMigrationCookiePtr mig,
virQEMUDriverPtr driver,
virQEMUCapsPtr qemuCaps,
const char *xml,
unsigned int flags)
{
@ -1403,7 +1405,7 @@ qemuMigrationCookieXMLParseStr(qemuMigrationCookiePtr mig,
if (!(doc = virXMLParseStringCtxt(xml, _("(qemu_migration_cookie)"), &ctxt)))
goto cleanup;
ret = qemuMigrationCookieXMLParse(mig, driver, doc, ctxt, flags);
ret = qemuMigrationCookieXMLParse(mig, driver, qemuCaps, doc, ctxt, flags);
cleanup:
xmlXPathFreeContext(ctxt);
@ -1505,6 +1507,7 @@ qemuMigrationEatCookie(virQEMUDriverPtr driver,
if (cookiein && cookieinlen &&
qemuMigrationCookieXMLParseStr(mig,
driver,
priv->qemuCaps,
cookiein,
flags) < 0)
goto error;