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| author | William Roche <william.roche@oracle.com> | 2024-01-30 19:06:40 +0000 |
|---|---|---|
| committer | Peter Xu <peterx@redhat.com> | 2024-02-05 14:41:58 +0800 |
| commit | 06152b89db64bc5ccec1e54576706ba891654df9 (patch) | |
| tree | df0fe21a342e770e23e964332630f18aa0a0221a /docs/sphinx/qapidoc.py | |
| parent | 39a6e4f87e7b75a45b08d6dc8b8b7c2954c87440 (diff) | |
| download | qemu-06152b89db64bc5ccec1e54576706ba891654df9.zip qemu-06152b89db64bc5ccec1e54576706ba891654df9.tar.gz qemu-06152b89db64bc5ccec1e54576706ba891654df9.tar.bz2 | |
migration: prevent migration when VM has poisoned memory
A memory page poisoned from the hypervisor level is no longer readable.
The migration of a VM will crash Qemu when it tries to read the
memory address space and stumbles on the poisoned page with a similar
stack trace:
Program terminated with signal SIGBUS, Bus error.
#0 _mm256_loadu_si256
#1 buffer_zero_avx2
#2 select_accel_fn
#3 buffer_is_zero
#4 save_zero_page
#5 ram_save_target_page_legacy
#6 ram_save_host_page
#7 ram_find_and_save_block
#8 ram_save_iterate
#9 qemu_savevm_state_iterate
#10 migration_iteration_run
#11 migration_thread
#12 qemu_thread_start
To avoid this VM crash during the migration, prevent the migration
when a known hardware poison exists on the VM.
Signed-off-by: William Roche <william.roche@oracle.com>
Link: https://lore.kernel.org/r/20240130190640.139364-2-william.roche@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Diffstat (limited to 'docs/sphinx/qapidoc.py')
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