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migration: new message MIG_RP_MSG_RECV_BITMAP

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Introducing new return path message MIG_RP_MSG_RECV_BITMAP to send
received bitmap of ramblock back to source.

This is the reply message of MIG_CMD_RECV_BITMAP, it contains not only
the header (including the ramblock name), and it was appended with the
whole ramblock received bitmap on the destination side.

When the source receives such a reply message (MIG_RP_MSG_RECV_BITMAP),
it parses it, convert it to the dirty bitmap by inverting the bits.

One thing to mention is that, when we send the recv bitmap, we are doing
these things in extra:

- converting the bitmap to little endian, to support when hosts are
  using different endianess on src/dst.

- do proper alignment for 8 bytes, to support when hosts are using
  different word size (32/64 bits) on src/dst.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180502104740.12123-13-peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2018-05-02 18:47:28 +08:00 • committed by Juan Quintela
parent f25d42253c
commit a335debb35
6 changed files with 221 additions and 1 deletions
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2
migration/savevm.c
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@ -1852,7 +1852,7 @@ static int loadvm_handle_recv_bitmap(MigrationIncomingState *mis,
return -EINVAL;
}
/* TODO: send the bitmap back to source */
migrate_send_rp_recv_bitmap(mis, block_name);
trace_loadvm_handle_recv_bitmap(block_name);