From c6dcec2dc7cb4060850587a0e5f9f90c4c2b3a95 Mon Sep 17 00:00:00 2001
Message-Id: <c6dcec2dc7cb4060850587a0e5f9f90c4c2b3a95@dist-git>
From: Jiri Denemark <jdenemar@redhat.com>
Date: Fri, 16 Aug 2019 14:52:34 +0200
Subject: [PATCH] qemu: Pass correct qemuCaps to virDomainDefPostParse
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit

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 virDomainDefPostParse.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
(cherry picked from commit c90fb5a828a68512095d80c190c0f491e385438e)

Conflicts:
	src/qemu/qemu_driver.c
            - context

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

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Message-Id: <816c373facf7f779dc22d8a8e6e382cadf5cc2b7.1565959866.git.jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 src/qemu/qemu_driver.c  | 17 ++++++++++-------
 src/qemu/qemu_process.c |  2 +-
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 82371b9a66..cc7210c6f4 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -7881,6 +7881,7 @@ static int
 qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef,
                              virDomainDeviceDefPtr dev,
                              virCapsPtr caps,
+                             virQEMUCapsPtr qemuCaps,
                              unsigned int parse_flags,
                              virDomainXMLOptionPtr xmlopt)
 {
@@ -8070,7 +8071,7 @@ qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef,
          return -1;
     }
 
-    if (virDomainDefPostParse(vmdef, caps, parse_flags, xmlopt, NULL) < 0)
+    if (virDomainDefPostParse(vmdef, caps, parse_flags, xmlopt, qemuCaps) < 0)
         return -1;
 
     return 0;
@@ -8081,6 +8082,7 @@ static int
 qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef,
                              virDomainDeviceDefPtr dev,
                              virCapsPtr caps,
+                             virQEMUCapsPtr qemuCaps,
                              unsigned int parse_flags,
                              virDomainXMLOptionPtr xmlopt)
 {
@@ -8262,7 +8264,7 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef,
         return -1;
     }
 
-    if (virDomainDefPostParse(vmdef, caps, parse_flags, xmlopt, NULL) < 0)
+    if (virDomainDefPostParse(vmdef, caps, parse_flags, xmlopt, qemuCaps) < 0)
         return -1;
 
     return 0;
@@ -8272,6 +8274,7 @@ static int
 qemuDomainUpdateDeviceConfig(virDomainDefPtr vmdef,
                              virDomainDeviceDefPtr dev,
                              virCapsPtr caps,
+                             virQEMUCapsPtr qemuCaps,
                              unsigned int parse_flags,
                              virDomainXMLOptionPtr xmlopt)
 {
@@ -8367,7 +8370,7 @@ qemuDomainUpdateDeviceConfig(virDomainDefPtr vmdef,
         return -1;
     }
 
-    if (virDomainDefPostParse(vmdef, caps, parse_flags, xmlopt, NULL) < 0)
+    if (virDomainDefPostParse(vmdef, caps, parse_flags, xmlopt, qemuCaps) < 0)
         return -1;
 
     return 0;
@@ -8426,7 +8429,7 @@ qemuDomainAttachDeviceLiveAndConfig(virDomainObjPtr vm,
                                          VIR_DOMAIN_DEVICE_ACTION_ATTACH,
                                          false) < 0)
             goto cleanup;
-        if ((ret = qemuDomainAttachDeviceConfig(vmdef, dev, caps,
+        if ((ret = qemuDomainAttachDeviceConfig(vmdef, dev, caps, priv->qemuCaps,
                                                 parse_flags,
                                                 driver->xmlopt)) < 0)
             goto cleanup;
@@ -8585,7 +8588,7 @@ static int qemuDomainUpdateDeviceFlags(virDomainPtr dom,
 
         /* virDomainDefCompatibleDevice call is delayed until we know the
          * device we're going to update. */
-        if ((ret = qemuDomainUpdateDeviceConfig(vmdef, dev, caps,
+        if ((ret = qemuDomainUpdateDeviceConfig(vmdef, dev, caps, priv->qemuCaps,
                                                 parse_flags,
                                                 driver->xmlopt)) < 0)
             goto endjob;
@@ -8680,7 +8683,7 @@ qemuDomainDetachDeviceLiveAndConfig(virQEMUDriverPtr driver,
         if (!vmdef)
             goto cleanup;
 
-        if (qemuDomainDetachDeviceConfig(vmdef, dev, caps,
+        if (qemuDomainDetachDeviceConfig(vmdef, dev, caps, priv->qemuCaps,
                                          parse_flags,
                                          driver->xmlopt) < 0)
             goto cleanup;
@@ -8766,7 +8769,7 @@ qemuDomainDetachDeviceAliasLiveAndConfig(virQEMUDriverPtr driver,
         if (virDomainDefFindDevice(vmdef, alias, &dev, true) < 0)
             goto cleanup;
 
-        if (qemuDomainDetachDeviceConfig(vmdef, &dev, caps,
+        if (qemuDomainDetachDeviceConfig(vmdef, &dev, caps, priv->qemuCaps,
                                          parse_flags, driver->xmlopt) < 0)
             goto cleanup;
     }
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 08e1d91fcc..307098cd63 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -5350,7 +5350,7 @@ qemuProcessInit(virQEMUDriverPtr driver,
     if (vm->def->postParseFailed) {
         VIR_DEBUG("re-running the post parse callback");
 
-        if (virDomainDefPostParse(vm->def, caps, 0, driver->xmlopt, NULL) < 0)
+        if (virDomainDefPostParse(vm->def, caps, 0, driver->xmlopt, priv->qemuCaps) < 0)
             goto cleanup;
     }
 
-- 
2.22.1