qemu/tests/migration
Daniil Tatianin adc1914a40 i386/a-b-bootblock: zero the first byte of each page on start
The migration qtest all the way up to this point used to work by sheer
luck relying on the contents of all pages from 1MiB to 100MiB to contain
the same one value in the first byte initially.

This easily breaks if we reduce the amount of RAM for the test instances
from 150MiB to e.g 110MiB since that makes SeaBIOS dirty some of the
pages starting at about 0x5dd2000 (~93 MiB) as it reuses those for the
HighMemory allocator since commit dc88f9b72df ("malloc: use large
ZoneHigh when there is enough memory").

This would result in the following errors:
    12/60 qemu:qtest+qtest-x86_64 / qtest-x86_64/migration-test                 ERROR           2.74s   killed by signal 6 SIGABRT
    stderr:
    Memory content inconsistency at 5dd2000 first_byte = cc last_byte = cb current = 9e hit_edge = 1
    Memory content inconsistency at 5dd3000 first_byte = cc last_byte = cb current = 89 hit_edge = 1
    Memory content inconsistency at 5dd4000 first_byte = cc last_byte = cb current = 23 hit_edge = 1
    Memory content inconsistency at 5dd5000 first_byte = cc last_byte = cb current = 31 hit_edge = 1
    Memory content inconsistency at 5dd6000 first_byte = cc last_byte = cb current = 70 hit_edge = 1
    Memory content inconsistency at 5dd7000 first_byte = cc last_byte = cb current = ff hit_edge = 1
    Memory content inconsistency at 5dd8000 first_byte = cc last_byte = cb current = 54 hit_edge = 1
    Memory content inconsistency at 5dd9000 first_byte = cc last_byte = cb current = 64 hit_edge = 1
    Memory content inconsistency at 5dda000 first_byte = cc last_byte = cb current = 1d hit_edge = 1
    Memory content inconsistency at 5ddb000 first_byte = cc last_byte = cb current = 1a hit_edge = 1
    and in another 26 pages**
    ERROR:../tests/qtest/migration-test.c:300:check_guests_ram: assertion failed: (bad == 0)

Fix this by always zeroing the first byte of each page in the range so
that we get consistent results no matter the initial contents.

Fixes: ea0c6d6239 ("test: Postcopy")
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20230919102346.2117963-3-d-tatianin@yandex-team.ru>
2023-10-04 11:47:40 +02:00
..
aarch64 tests/migration/aarch64: Speed up the aarch64 migration test 2022-08-24 10:14:49 +01:00
guestperf hw/misc/sga: Remove the deprecated "sga" device 2023-02-14 09:02:42 +01:00
i386 i386/a-b-bootblock: zero the first byte of each page on start 2023-10-04 11:47:40 +02:00
s390x tests/migration: Add -fno-stack-protector 2023-08-01 23:52:23 +02:00
guestperf-batch.py tests/: spelling fixes 2023-09-08 13:08:52 +03:00
guestperf-plot.py tests/migration: Fix LGPL information in the file headers 2020-11-15 17:04:40 +01:00
guestperf.py tests/: spelling fixes 2023-09-08 13:08:52 +03:00
initrd-stress.sh meson: convert migration/initrd-stress 2020-09-08 11:43:16 +02:00
Makefile migration-test: Only generate a single target architecture 2018-10-11 19:58:26 +01:00
meson.build meson: do not unnecessarily use cmake for dependencies 2023-09-07 13:32:14 +02:00
migration-test.h Clean up a few header guard symbols 2019-06-12 13:20:20 +02:00
stress.c tests: Use g_mkdir_with_parents() 2022-08-25 15:24:09 +02:00