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migration/multifd: Allow clearing of the file_bmap from multifd 

We currently only need to clear the mapped-ram file bitmap from the
migration thread during save_zero_page.

We're about to add support for zero page detection on the multifd
thread, so allow ramblock_set_file_bmap_atomic() to also clear the
bits.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240311180015.3359271-3-hao.xiang@linux.dev
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Fabiano Rosas 2024-03-11 18:00:10 +00:00 committed by Peter Xu
parent 44fe138edc
commit c3cdf3fb18
3 changed files with 9 additions and 4 deletions
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2
migration/multifd.c
View File

@ -115,7 +115,7 @@ static void multifd_set_file_bitmap(MultiFDSendParams *p)
assert(pages->block);
for (int i = 0; i < p->pages->num; i++) {
ramblock_set_file_bmap_atomic(pages->block, pages->offset[i]);
ramblock_set_file_bmap_atomic(pages->block, pages->offset[i], true);
}
}

8
migration/ram.c
View File

@ -3149,9 +3149,13 @@ static void ram_save_file_bmap(QEMUFile *f)
}
}
void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset)
void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset, bool set)
{
set_bit_atomic(offset >> TARGET_PAGE_BITS, block->file_bmap);
if (set) {
set_bit_atomic(offset >> TARGET_PAGE_BITS, block->file_bmap);
} else {
clear_bit_atomic(offset >> TARGET_PAGE_BITS, block->file_bmap);
}
}
/**

3
migration/ram.h
View File

@ -75,7 +75,8 @@ bool ram_dirty_bitmap_reload(MigrationState *s, RAMBlock *rb, Error **errp);
bool ramblock_page_is_discarded(RAMBlock *rb, ram_addr_t start);
void postcopy_preempt_shutdown_file(MigrationState *s);
void *postcopy_preempt_thread(void *opaque);
void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset);
void ramblock_set_file_bmap_atomic(RAMBlock *block, ram_addr_t offset,
bool set);
/* ram cache */
int colo_init_ram_cache(void);