From ff519677375acb8592f88c3a17f62b3aee07431e Mon Sep 17 00:00:00 2001
Message-Id: <ff519677375acb8592f88c3a17f62b3aee07431e@dist-git>
From: Jiri Denemark <jdenemar@redhat.com>
Date: Fri, 16 Aug 2019 14:52:30 +0200
Subject: [PATCH] qemu: Pass qemuCaps to qemuMigrationAnyPrepareDef
MIME-Version: 1.0
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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 qemuMigrationAnyPrepareDef.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit b900f7387fca1cf3567935c81136579d6bee95ca)

https://bugzilla.redhat.com/show_bug.cgi?id=1731783

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Message-Id: <9c8ee8580063e52b001b969a2fbb1f1cc3ebfc37.1565959866.git.jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 src/qemu/qemu_driver.c    | 12 ++++++------
 src/qemu/qemu_migration.c |  8 ++++++--
 src/qemu/qemu_migration.h |  1 +
 3 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 04915798ab..590596a421 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -12184,7 +12184,7 @@ qemuDomainMigratePrepareTunnel(virConnectPtr dconn,
         goto cleanup;
     }
 
-    if (!(def = qemuMigrationAnyPrepareDef(driver, dom_xml, dname, &origname)))
+    if (!(def = qemuMigrationAnyPrepareDef(driver, NULL, dom_xml, dname, &origname)))
         goto cleanup;
 
     if (virDomainMigratePrepareTunnelEnsureACL(dconn, def) < 0)
@@ -12245,7 +12245,7 @@ qemuDomainMigratePrepare2(virConnectPtr dconn,
         goto cleanup;
     }
 
-    if (!(def = qemuMigrationAnyPrepareDef(driver, dom_xml, dname, &origname)))
+    if (!(def = qemuMigrationAnyPrepareDef(driver, NULL, dom_xml, dname, &origname)))
         goto cleanup;
 
     if (virDomainMigratePrepare2EnsureACL(dconn, def) < 0)
@@ -12487,7 +12487,7 @@ qemuDomainMigratePrepare3(virConnectPtr dconn,
                                                    QEMU_MIGRATION_DESTINATION)))
         goto cleanup;
 
-    if (!(def = qemuMigrationAnyPrepareDef(driver, dom_xml, dname, &origname)))
+    if (!(def = qemuMigrationAnyPrepareDef(driver, NULL, dom_xml, dname, &origname)))
         goto cleanup;
 
     if (virDomainMigratePrepare3EnsureACL(dconn, def) < 0)
@@ -12574,7 +12574,7 @@ qemuDomainMigratePrepare3Params(virConnectPtr dconn,
         goto cleanup;
     }
 
-    if (!(def = qemuMigrationAnyPrepareDef(driver, dom_xml, dname, &origname)))
+    if (!(def = qemuMigrationAnyPrepareDef(driver, NULL, dom_xml, dname, &origname)))
         goto cleanup;
 
     if (virDomainMigratePrepare3ParamsEnsureACL(dconn, def) < 0)
@@ -12628,7 +12628,7 @@ qemuDomainMigratePrepareTunnel3(virConnectPtr dconn,
                                                    QEMU_MIGRATION_DESTINATION)))
         goto cleanup;
 
-    if (!(def = qemuMigrationAnyPrepareDef(driver, dom_xml, dname, &origname)))
+    if (!(def = qemuMigrationAnyPrepareDef(driver, NULL, dom_xml, dname, &origname)))
         goto cleanup;
 
     if (virDomainMigratePrepareTunnel3EnsureACL(dconn, def) < 0)
@@ -12687,7 +12687,7 @@ qemuDomainMigratePrepareTunnel3Params(virConnectPtr dconn,
                                                    QEMU_MIGRATION_DESTINATION)))
         goto cleanup;
 
-    if (!(def = qemuMigrationAnyPrepareDef(driver, dom_xml, dname, &origname)))
+    if (!(def = qemuMigrationAnyPrepareDef(driver, NULL, dom_xml, dname, &origname)))
         goto cleanup;
 
     if (virDomainMigratePrepareTunnel3ParamsEnsureACL(dconn, def) < 0)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 111038b971..f5d77d2508 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -2852,6 +2852,7 @@ qemuMigrationDstPrepareDirect(virQEMUDriverPtr driver,
 
 virDomainDefPtr
 qemuMigrationAnyPrepareDef(virQEMUDriverPtr driver,
+                           virQEMUCapsPtr qemuCaps,
                            const char *dom_xml,
                            const char *dname,
                            char **origname)
@@ -2869,7 +2870,8 @@ qemuMigrationAnyPrepareDef(virQEMUDriverPtr driver,
     if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
         return NULL;
 
-    if (!(def = virDomainDefParseString(dom_xml, caps, driver->xmlopt, NULL,
+    if (!(def = virDomainDefParseString(dom_xml, caps, driver->xmlopt,
+                                        qemuCaps,
                                         VIR_DOMAIN_DEF_PARSE_INACTIVE |
                                         VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE)))
         goto cleanup;
@@ -3412,7 +3414,9 @@ qemuMigrationSrcRun(virQEMUDriverPtr driver,
 
     if (flags & VIR_MIGRATE_PERSIST_DEST) {
         if (persist_xml) {
-            if (!(persistDef = qemuMigrationAnyPrepareDef(driver, persist_xml,
+            if (!(persistDef = qemuMigrationAnyPrepareDef(driver,
+                                                          priv->qemuCaps,
+                                                          persist_xml,
                                                           NULL, NULL)))
                 goto error;
         } else {
diff --git a/src/qemu/qemu_migration.h b/src/qemu/qemu_migration.h
index e12b6972db..b9feffaf93 100644
--- a/src/qemu/qemu_migration.h
+++ b/src/qemu/qemu_migration.h
@@ -115,6 +115,7 @@ qemuMigrationSrcBegin(virConnectPtr conn,
 
 virDomainDefPtr
 qemuMigrationAnyPrepareDef(virQEMUDriverPtr driver,
+                           virQEMUCapsPtr qemuCaps,
                            const char *dom_xml,
                            const char *dname,
                            char **origname);
-- 
2.22.1