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migration: ram block cpr blockers

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Unlike cpr-reboot mode, cpr-transfer mode cannot save volatile ram blocks
in the migration stream file and recreate them later, because the physical
memory for the blocks is pinned and registered for vfio.  Add a blocker
for volatile ram blocks.

Also add a blocker for RAM_GUEST_MEMFD.  Preserving guest_memfd may be
sufficient for CPR, but it has not been tested yet.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-ID: <1740667681-257312-1-git-send-email-steven.sistare@oracle.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Steve Sistare 2025-02-27 06:48:01 -08:00 • committed by Fabiano Rosas
parent d657a14de5
commit 094a3dbc55
4 changed files with 72 additions and 0 deletions
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3
include/exec/memory.h
View file

@ -3203,6 +3203,9 @@ bool ram_block_discard_is_disabled(void);
*/
bool ram_block_discard_is_required(void);
void ram_block_add_cpr_blocker(RAMBlock *rb, Error **errp);
void ram_block_del_cpr_blocker(RAMBlock *rb);
#endif
#endif

1
include/exec/ramblock.h
View file

@ -39,6 +39,7 @@ struct RAMBlock {
/* RCU-enabled, writes protected by the ramlist lock */
QLIST_ENTRY(RAMBlock) next;
QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers;
Error *cpr_blocker;
int fd;
uint64_t fd_offset;
int guest_memfd;