[PATCH v2] qemu: neglect cur_balloon in supplied xml

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cur_balloon value can change in between preparing external config and
using it in operations like save and migrate. As a resutl operation will
fail for ABI inconsistency. cur_balloon changes can not be predicted
generally and thus operations will fail from time to time.

Skip checking cur_balloon if domain lock can not be hold between
preparing external config outside of libvirt and checking it against active
config. Instead update cur_balloon value in external config from active config.
This way it is protected from forges and is keeped up to date too.

Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy@xxxxxxxxxxxxx>
---
 src/conf/domain_conf.c    | 14 +++++++++++---
 src/conf/domain_conf.h    |  9 +++++++++
 src/libvirt_private.syms  |  1 +
 src/qemu/qemu_domain.c    | 29 ++++++++++++++++++++---------
 src/qemu/qemu_domain.h    |  6 +++---
 src/qemu/qemu_driver.c    |  5 +++--
 src/qemu/qemu_migration.c |  4 ++--
 7 files changed, 49 insertions(+), 19 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 85f6e31..f1cf87f 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -18493,8 +18493,9 @@ virDomainDefVcpuCheckAbiStability(virDomainDefPtr src,
  * validation of custom XML config passed in during migration
  */
 bool
-virDomainDefCheckABIStability(virDomainDefPtr src,
-                              virDomainDefPtr dst)
+virDomainDefCheckABIStabilityFlags(virDomainDefPtr src,
+                                   virDomainDefPtr dst,
+                                   unsigned int flags)
 {
     size_t i;
     virErrorPtr err;
@@ -18538,7 +18539,8 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
                        virDomainDefGetMemoryInitial(src));
         goto error;
     }
-    if (src->mem.cur_balloon != dst->mem.cur_balloon) {
+    if (!(flags & VIR_DOMAIN_DEF_ABI_CHECK_SKIP_VOLATILE) &&
+        src->mem.cur_balloon != dst->mem.cur_balloon) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Target domain current memory %lld does not match source %lld"),
                        dst->mem.cur_balloon, src->mem.cur_balloon);
@@ -18963,6 +18965,12 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
     return false;
 }
 
+bool
+virDomainDefCheckABIStability(virDomainDefPtr src,
+                              virDomainDefPtr dst)
+{
+    return virDomainDefCheckABIStabilityFlags(src, dst, 0);
+}
 
 static int
 virDomainDefAddDiskControllersForType(virDomainDefPtr def,
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 3792562..cd7b966 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2623,6 +2623,11 @@ typedef enum {
     VIR_DOMAIN_DEF_FORMAT_CLOCK_ADJUST    = 1 << 9,
 } virDomainDefFormatFlags;
 
+typedef enum {
+    /* skip checking values like cur_balloon that can be changed meanwhile */
+    VIR_DOMAIN_DEF_ABI_CHECK_SKIP_VOLATILE = 1 << 0,
+} virDomainDefABICheckFlags;
+
 virDomainDeviceDefPtr virDomainDeviceDefParse(const char *xmlStr,
                                               const virDomainDef *def,
                                               virCapsPtr caps,
@@ -2658,6 +2663,10 @@ virDomainObjPtr virDomainObjParseFile(const char *filename,
 bool virDomainDefCheckABIStability(virDomainDefPtr src,
                                    virDomainDefPtr dst);
 
+bool virDomainDefCheckABIStabilityFlags(virDomainDefPtr src,
+                                        virDomainDefPtr dst,
+                                        unsigned int flags);
+
 int virDomainDefAddImplicitDevices(virDomainDefPtr def);
 
 virDomainIOThreadIDDefPtr virDomainIOThreadIDFind(const virDomainDef *def,
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 42f664c..4e7840c 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -208,6 +208,7 @@ virDomainDefAddController;
 virDomainDefAddImplicitDevices;
 virDomainDefAddUSBController;
 virDomainDefCheckABIStability;
+virDomainDefCheckABIStabilityFlags;
 virDomainDefClearCCWAddresses;
 virDomainDefClearDeviceAliases;
 virDomainDefClearPCIAddresses;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index d1f8175..4b45caf 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -4620,21 +4620,32 @@ qemuDomainUpdateMemoryDeviceInfo(virQEMUDriverPtr driver,
 }
 
 
-bool
-qemuDomainDefCheckABIStability(virQEMUDriverPtr driver,
-                               virDomainDefPtr src,
-                               virDomainDefPtr dst)
+int
+qemuDomainDefUpdateVolatile(virQEMUDriverPtr driver,
+                            virDomainDefPtr src,
+                            virDomainDefPtr dst)
 {
     virDomainDefPtr migratableDefSrc = NULL;
     virDomainDefPtr migratableDefDst = NULL;
-    const int flags = VIR_DOMAIN_XML_SECURE | VIR_DOMAIN_XML_UPDATE_CPU | VIR_DOMAIN_XML_MIGRATABLE;
-    bool ret = false;
+    const unsigned int copy_flags = VIR_DOMAIN_XML_SECURE |
+                                    VIR_DOMAIN_XML_UPDATE_CPU |
+                                    VIR_DOMAIN_XML_MIGRATABLE;
+    const unsigned int check_flags = VIR_DOMAIN_DEF_ABI_CHECK_SKIP_VOLATILE;
+    int ret = -1;
 
-    if (!(migratableDefSrc = qemuDomainDefCopy(driver, src, flags)) ||
-        !(migratableDefDst = qemuDomainDefCopy(driver, dst, flags)))
+
+    if (!(migratableDefSrc = qemuDomainDefCopy(driver, src, copy_flags)) ||
+        !(migratableDefDst = qemuDomainDefCopy(driver, dst, copy_flags)))
+        goto cleanup;
+
+    if (!virDomainDefCheckABIStabilityFlags(migratableDefSrc,
+                                            migratableDefDst,
+                                            check_flags))
         goto cleanup;
 
-    ret = virDomainDefCheckABIStability(migratableDefSrc, migratableDefDst);
+    dst->mem.cur_balloon = src->mem.cur_balloon;
+
+    ret = 0;
 
  cleanup:
     virDomainDefFree(migratableDefSrc);
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 2443e97..7581fff 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -578,9 +578,9 @@ int qemuDomainUpdateMemoryDeviceInfo(virQEMUDriverPtr driver,
                                      virDomainObjPtr vm,
                                      int asyncJob);
 
-bool qemuDomainDefCheckABIStability(virQEMUDriverPtr driver,
-                                    virDomainDefPtr src,
-                                    virDomainDefPtr dst);
+int qemuDomainDefUpdateVolatile(virQEMUDriverPtr driver,
+                                virDomainDefPtr src,
+                                virDomainDefPtr dst);
 
 bool qemuDomainAgentAvailable(virDomainObjPtr vm,
                               bool reportError);
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index e70d3ce..a819f53 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -3244,7 +3244,7 @@ qemuDomainSaveInternal(virQEMUDriverPtr driver, virDomainPtr dom,
                                             VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE))) {
             goto endjob;
         }
-        if (!qemuDomainDefCheckABIStability(driver, vm->def, def)) {
+        if (qemuDomainDefUpdateVolatile(driver, vm->def, def) < 0) {
             virDomainDefFree(def);
             goto endjob;
         }
@@ -15103,7 +15103,8 @@ qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
             /* Transitions 5, 6, 8, 9 */
             /* Check for ABI compatibility. We need to do this check against
              * the migratable XML or it will always fail otherwise */
-            if (config && !qemuDomainDefCheckABIStability(driver, vm->def, config)) {
+            if (config
+                && qemuDomainDefUpdateVolatile(driver, vm->def, config) < 0) {
                 virErrorPtr err = virGetLastError();
 
                 if (!(flags & VIR_DOMAIN_SNAPSHOT_REVERT_FORCE)) {
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 89350c8..38f471b 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3237,7 +3237,7 @@ qemuMigrationBeginPhase(virQEMUDriverPtr driver,
                                             VIR_DOMAIN_DEF_PARSE_SKIP_VALIDATE)))
             goto cleanup;
 
-        if (!qemuDomainDefCheckABIStability(driver, vm->def, def))
+        if (qemuDomainDefUpdateVolatile(driver, vm->def, def) < 0)
             goto cleanup;
 
         rv = qemuDomainDefFormatLive(driver, def, false, true);
@@ -3582,7 +3582,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                 if (!newdef)
                     goto cleanup;
 
-                if (!qemuDomainDefCheckABIStability(driver, *def, newdef)) {
+                if (qemuDomainDefUpdateVolatile(driver, *def, newdef) < 0) {
                     virDomainDefFree(newdef);
                     goto cleanup;
                 }
-- 
1.8.3.1

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