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| author | Stefan Reiter <s.reiter@proxmox.com> | 2020-10-21 16:44:56 +0200 |
|---|---|---|
| committer | Eric Blake <eblake@redhat.com> | 2020-10-26 06:55:37 -0500 |
| commit | ed7b70c27b5c11ff4800e608d301cd7a36b81c5e (patch) | |
| tree | 4785a7ba48aefa565a9a2585fe96c2457db1b517 /migration/postcopy-ram.c | |
| parent | 4c5b97bfd0dd54dc27717ae8d1cd10e14eef1430 (diff) | |
migration/block-dirty-bitmap: fix larger granularity bitmaps
sectors_per_chunk is a 64 bit integer, but the calculation is done in 32
bits, leading to an overflow for coarse bitmap granularities.
If that results in the value 0, it leads to a hang where no progress is
made but send_bitmap_bits is constantly called with nr_sectors being 0.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Message-Id: <20201021144456.1072-1-s.reiter@proxmox.com>
Fixes: b35ebdf07 migration: add postcopy migration of dirty bitmaps
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: Use correct type for 8ULL, use () to avoid overflow]
Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'migration/postcopy-ram.c')
0 files changed, 0 insertions, 0 deletions