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Date: Thu, 25 Jul 2013 16:03:11 +0300
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH v3 07/14] loader: support for unmapped ROM
 blobs
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To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Michael Walle <michael@walle.cc>, qemu-devel@nongnu.org

On Thu, Jul 25, 2013 at 02:43:53PM +0200, Gerd Hoffmann wrote:
> On 07/25/13 14:28, Michael S. Tsirkin wrote:
> > On Thu, Jul 25, 2013 at 02:14:40PM +0200, Gerd Hoffmann wrote:
> >> On 07/24/13 18:01, Michael S. Tsirkin wrote:
> >>>      QTAILQ_FOREACH(rom, &roms, next) {
> >>> +        if (rom->mr) {
> >>> +            continue;
> >>> +        }
> >>>          if (rom->fw_file) {
> >>>              continue;
> >>>          }
> >>>          if (rom->data == NULL) {
> >>>              continue;
> >>>          }
> >>> -        cpu_physical_memory_write_rom(rom->addr, rom->data, rom->datasize);
> >>> +        if (rom->mr) {
> >>> +            void *host = memory_region_get_ram_ptr(rom->mr);
> >>> +            memcpy(host, rom->data, rom->datasize);
> >>
> >> I think this code never ever runs ...
> >>
> >> cheers,
> >>   Gerd
> >>
> > 
> > 
> > Could you be clearer please? This chunk is in rom_reset,
> > I think it runs on reset.
> 
> You have the "if (rom->mr)" twice in the loop.  The first does continue
> so the second will never ever evaluate to true, thereby making the
> memcpy dead code.
> 
> cheers,
>   Gerd


Hmm that's a bugt I think. Thanks!