[PATCH] tests/qtest/migration-test: Fix analyze-migration.py for s390x

[Thomas Huth <thuth@redhat.com>]

The migration stream on s390x contains data for the storage_attributes
which the analyze-migration.py cannot handle yet. Add the basic code
for handling this, so we can re-enable the check in the migration-test.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 tests/qtest/migration-test.c |  4 +---
 scripts/analyze-migration.py | 35 +++++++++++++++++++++++++++++++++--
 2 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
index 5752412b64..20b8dd8b12 100644
--- a/tests/qtest/migration-test.c
+++ b/tests/qtest/migration-test.c
@@ -3360,9 +3360,7 @@ int main(int argc, char **argv)
 
     qtest_add_func("/migration/bad_dest", test_baddest);
 #ifndef _WIN32
-    if (!g_str_equal(arch, "s390x")) {
-        qtest_add_func("/migration/analyze-script", test_analyze_script);
-    }
+    qtest_add_func("/migration/analyze-script", test_analyze_script);
 #endif
     qtest_add_func("/migration/precopy/unix/plain", test_precopy_unix_plain);
     qtest_add_func("/migration/precopy/unix/xbzrle", test_precopy_unix_xbzrle);
diff --git a/scripts/analyze-migration.py b/scripts/analyze-migration.py
index de506cb8bf..a39dfb8766 100755
--- a/scripts/analyze-migration.py
+++ b/scripts/analyze-migration.py
@@ -263,6 +263,34 @@ def getDict(self):
         return ""
 
 
+class S390StorageAttributes(object):
+    STATTR_FLAG_EOS   = 0x01
+    STATTR_FLAG_MORE  = 0x02
+    STATTR_FLAG_ERROR = 0x04
+    STATTR_FLAG_DONE  = 0x08
+
+    def __init__(self, file, version_id, device, section_key):
+        if version_id != 0:
+            raise Exception("Unknown storage_attributes version %d" % version_id)
+
+        self.file = file
+        self.section_key = section_key
+
+    def read(self):
+        while True:
+            addr_flags = self.file.read64()
+            flags = addr_flags & 0xfff
+            if (flags & (self.STATTR_FLAG_DONE | self.STATTR_FLAG_EOS)):
+                return
+            if (flags & self.STATTR_FLAG_ERROR):
+                raise Exception("Error in migration stream")
+            count = self.file.read64()
+            self.file.readvar(count)
+
+    def getDict(self):
+        return ""
+
+
 class ConfigurationSection(object):
     def __init__(self, file, desc):
         self.file = file
@@ -544,8 +572,11 @@ class MigrationDump(object):
     QEMU_VM_SECTION_FOOTER= 0x7e
 
     def __init__(self, filename):
-        self.section_classes = { ( 'ram', 0 ) : [ RamSection, None ],
-                                 ( 'spapr/htab', 0) : ( HTABSection, None ) }
+        self.section_classes = {
+            ( 'ram', 0 ) : [ RamSection, None ],
+            ( 's390-storage_attributes', 0 ) : [ S390StorageAttributes, None],
+            ( 'spapr/htab', 0) : ( HTABSection, None )
+        }
         self.filename = filename
         self.vmsd_desc = None
 
-- 
2.42.0