Re: [Qemu-devel] [PATCH v4 16/32] migration: new message MIG_RP_MSG_RECV_BITMAP

[Peter Xu]

On Thu, Nov 30, 2017 at 05:21:48PM +0000, Dr. David Alan Gilbert wrote:
> * Peter Xu (address@hidden) wrote:
> > 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.
> > 
> > Signed-off-by: Peter Xu <address@hidden>
> 
> (The comment on the receive side 'Add addings' is a bit odd!
> The send side is much better); other than that:
> 
> Reviewed-by: Dr. David Alan Gilbert <address@hidden>

Ouch.  It was meant to be "Add paddings". :)

I'll keep the r-b, though, with the fix.  Thanks,

> > +    /* Add addings */
> > +    le_bitmap = bitmap_new(nbits + BITS_PER_LONG);

-- 
Peter Xu