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authorJan Kiszka <jan.kiszka@siemens.com>2010-05-15 13:32:40 +0200
committerBlue Swirl <blauwirbel@gmail.com>2010-05-15 14:23:31 +0000
commit4d2ffa08b601bdd40d9ccf225480c0a7e90ca078 (patch)
treec58243f040336217efae96032a3fb666d5bcae98 /hw/hw.h
parentec86f3e1af558a9a6f8476b9c1903cb6f152b771 (diff)
vmstate: Add support for alias ID
Some legacy users (mostly PC devices) of vmstate_register manage instance IDs on their own, and that unfortunately in a way that is incompatible with automatically generated ones. This so far prevents switching those users to vmstates that are registered by qdev. To establish a migration path, this patch introduces the concept of alias IDs. They can be passed to an extended vmstate registration service, and qdev provides a set service to be used during device init. find_se will consider the alias in addition to the default ID. We can then start generating the default ID automatically and writing it on vmsave, thus converting that format without breaking support for upward migration. The user is required specify the highest vmstate version for which the alias is required. Once this version falls behind the minimum required for a specific vmstate, an assertion triggers to motivate cleaning up the obsolete alias. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Diffstat (limited to 'hw/hw.h')
-rw-r--r--hw/hw.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/hw.h b/hw/hw.h
index 2d397243d1..fc2d1849d7 100644
--- a/hw/hw.h
+++ b/hw/hw.h
@@ -758,5 +758,9 @@ extern void vmstate_save_state(QEMUFile *f, const VMStateDescription *vmsd,
void *opaque);
extern int vmstate_register(int instance_id, const VMStateDescription *vmsd,
void *base);
+extern int vmstate_register_with_alias_id(int instance_id,
+ const VMStateDescription *vmsd,
+ void *base, int alias_id,
+ int required_for_version);
void vmstate_unregister(const VMStateDescription *vmsd, void *opaque);
#endif