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migration/multifd: Enable multifd zero page checking by default.

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1. Set default "zero-page-detection" option to "multifd". Now
zero page checking can be done in the multifd threads and this
becomes the default configuration.
2. Handle migration QEMU9.0 -> QEMU8.2 compatibility. We provide
backward compatibility where zero page checking is done from the
migration main thread.

Signed-off-by: Hao Xiang <hao.xiang@bytedance.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20240311180015.3359271-7-hao.xiang@linux.dev
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Hao Xiang 2024-03-11 18:00:14 +00:00 • committed by Peter Xu
parent 9ae90f73e6
commit 70c25c92e6
3 changed files with 7 additions and 5 deletions
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4
hw/core/machine.c
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@ -32,7 +32,9 @@
#include "hw/virtio/virtio-net.h"
#include "audio/audio.h"
GlobalProperty hw_compat_8_2[] = {};
GlobalProperty hw_compat_8_2[] = {
{ "migration", "zero-page-detection", "legacy"},
};
const size_t hw_compat_8_2_len = G_N_ELEMENTS(hw_compat_8_2);
GlobalProperty hw_compat_8_1[] = {