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Revert "migration: do not sent zero pages in bulk stage" 

Not sending zero pages breaks migration if a page is zero
at the source but not at the destination. This can e.g. happen
if different BIOS versions are used at source and destination.
It has also been reported that migration on pseries is completely
broken with this patch.

This effectively reverts commit f1c72795af.

Conflicts:

	arch_init.c

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Juan Quintela <quintela@redhat.com>
(cherry picked from commit 9ef051e553)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Peter Lieven 2013-06-10 12:14:19 +02:00 committed by Michael Roth
parent d306fd5f4a
commit 64a72fa71f
1 changed files with 4 additions and 9 deletions
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13
arch_init.c
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@ -457,15 +457,10 @@ static int ram_save_block(QEMUFile *f, bool last_stage)
bytes_sent = -1;
if (is_zero_page(p)) {
acct_info.dup_pages++;
if (!ram_bulk_stage) {
bytes_sent = save_block_hdr(f, block, offset, cont,
RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, 0);
bytes_sent++;
} else {
acct_info.skipped_pages++;
bytes_sent = 0;
}
bytes_sent = save_block_hdr(f, block, offset, cont,
RAM_SAVE_FLAG_COMPRESS);
qemu_put_byte(f, 0);
bytes_sent++;
} else if (!ram_bulk_stage && migrate_use_xbzrle()) {
current_addr = block->offset + offset;
bytes_sent = save_xbzrle_page(f, p, current_addr, block,