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[PULL,08/26] migration/ram: Fix error handling in ram_write_tracking_start()

Message ID 20230202160640.2300-9-quintela@redhat.com
State New
Headers show
Series [PULL,01/26] migration: Fix migration crash when target psize larger than host | expand

Commit Message

Juan Quintela Feb. 2, 2023, 4:06 p.m. UTC 
From: David Hildenbrand <david@redhat.com>

If something goes wrong during uffd_change_protection(), we would miss
to unregister uffd-wp and not release our reference. Fix it by
performing the uffd_change_protection(true) last.

Note that a uffd_change_protection(false) on the recovery path without a
prior uffd_change_protection(false) is fine.

Fixes: 278e2f551a09 ("migration: support UFFD write fault processing in ram_save_iterate()")
Cc: qemu-stable@nongnu.org
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/ram.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/migration/ram.c b/migration/ram.c
index ba228eead4..73e5ca93e5 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1896,13 +1896,14 @@  int ram_write_tracking_start(void)
                 block->max_length, UFFDIO_REGISTER_MODE_WP, NULL)) {
             goto fail;
         }
+        block->flags |= RAM_UF_WRITEPROTECT;
+        memory_region_ref(block->mr);
+
         /* Apply UFFD write protection to the block memory range */
         if (uffd_change_protection(rs->uffdio_fd, block->host,
                 block->max_length, true, false)) {
             goto fail;
         }
-        block->flags |= RAM_UF_WRITEPROTECT;
-        memory_region_ref(block->mr);
 
         trace_ram_write_tracking_ramblock_start(block->idstr, block->page_size,
                 block->host, block->max_length);