From fd2d738d9c12aeea42167e0de3662af5a64d93d5 Mon Sep 17 00:00:00 2001
Message-Id: <fd2d738d9c12aeea42167e0de3662af5a64d93d5@dist-git>
From: Peter Krempa <pkrempa@redhat.com>
Date: Tue, 22 Sep 2015 16:59:41 +0200
Subject: [PATCH] conf: Add XML parser flag that will allow us to do
 incompatible updates

https://bugzilla.redhat.com/show_bug.cgi?id=1252685

Add a new parser flag that will mark code paths that parse XML files
wich will not be used with existing VM state so that post parse
callbacks can possibly do ABI incompatible changes if needed.

(cherry picked from commit 59173c3dd94fc090d2776be3986a1014ddbf2396)

Conflicts:
	src/qemu/qemu_driver.c - context

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/conf/domain_conf.h    |  2 ++
 src/qemu/qemu_driver.c    | 12 ++++++++----
 src/qemu/qemu_migration.c |  3 ++-
 3 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 63685c6..bac64b3 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2613,6 +2613,8 @@ typedef enum {
     /* don't validate os.type and arch against capabilities. Prevents
      * VMs from disappearing when qemu is removed and libvirtd is restarted */
     VIR_DOMAIN_DEF_PARSE_SKIP_OSTYPE_CHECKS = 1 << 8,
+    /* allow updates in post parse callback that would break ABI otherwise */
+    VIR_DOMAIN_DEF_PARSE_ABI_UPDATE = 1 << 9,
 } virDomainDefParseFlags;
 
 typedef enum {
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 0f3e987..f15b14a 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -1714,7 +1714,8 @@ static virDomainPtr qemuDomainCreateXML(virConnectPtr conn,
     unsigned int start_flags = VIR_QEMU_PROCESS_START_COLD;
     virQEMUCapsPtr qemuCaps = NULL;
     virCapsPtr caps = NULL;
-    unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE;
+    unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE |
+                               VIR_DOMAIN_DEF_PARSE_ABI_UPDATE;
 
     virCheckFlags(VIR_DOMAIN_START_PAUSED |
                   VIR_DOMAIN_START_AUTODESTROY |
@@ -7179,7 +7180,8 @@ static char *qemuConnectDomainXMLToNative(virConnectPtr conn,
         goto cleanup;
 
     def = virDomainDefParseString(xmlData, caps, driver->xmlopt,
-                                  VIR_DOMAIN_DEF_PARSE_INACTIVE);
+                                  VIR_DOMAIN_DEF_PARSE_INACTIVE |
+                                  VIR_DOMAIN_DEF_PARSE_ABI_UPDATE);
     if (!def)
         goto cleanup;
 
@@ -7494,7 +7496,8 @@ static virDomainPtr qemuDomainDefineXMLFlags(virConnectPtr conn, const char *xml
     virQEMUCapsPtr qemuCaps = NULL;
     virQEMUDriverConfigPtr cfg;
     virCapsPtr caps = NULL;
-    unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE;
+    unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE |
+                               VIR_DOMAIN_DEF_PARSE_ABI_UPDATE;
 
     virCheckFlags(VIR_DOMAIN_DEFINE_VALIDATE, NULL);
 
@@ -8449,7 +8452,8 @@ static int qemuDomainAttachDeviceFlags(virDomainPtr dom, const char *xml,
     virDomainDefPtr vmdef = NULL;
     virDomainDeviceDefPtr dev = NULL, dev_copy = NULL;
     int ret = -1;
-    unsigned int affect, parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE;
+    unsigned int affect, parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE |
+                                       VIR_DOMAIN_DEF_PARSE_ABI_UPDATE;
     virQEMUCapsPtr qemuCaps = NULL;
     qemuDomainObjPrivatePtr priv;
     virQEMUDriverConfigPtr cfg = NULL;
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 93f561f..cb82687 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -1257,7 +1257,8 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
         }
         mig->persistent = virDomainDefParseNode(doc, nodes[0],
                                                 caps, driver->xmlopt,
-                                                VIR_DOMAIN_DEF_PARSE_INACTIVE);
+                                                VIR_DOMAIN_DEF_PARSE_INACTIVE |
+                                                VIR_DOMAIN_DEF_PARSE_ABI_UPDATE);
         if (!mig->persistent) {
             /* virDomainDefParseNode already reported
              * an error for us */
-- 
2.5.3