[Qemu-devel] Re: [SeaBIOS] [PATCH 0/8] option rom loading overhaul.

[Anthony Liguori]

Gerd Hoffmann wrote:
> On 12/18/09 17:42, Anthony Liguori wrote:
> > > Do we need to do something for -M pc-0.11? Like loading the pci roms
> > > via fw_cfg too so the guest doesn't see the new pci rom bar?
> >
> > Yes, we do. We can fix that problem as a stable-0.12 update though.
> > Right now, migration with pc-0.11 is broken in other areas too.
>
> Ok.  When it is fine to defer this to stable-0.12 then I have no 
> objections to merge it for 0.12 (assuming the seabios folks ack+merge 
> the seabios changes).

Note, I also needed this to quiet things a bit.

diff --git a/hw/fw_cfg.c b/hw/fw_cfg.c
index 0492f5f..fe9c527 100644
--- a/hw/fw_cfg.c
+++ b/hw/fw_cfg.c
@@ -309,8 +309,8 @@ int fw_cfg_add_file(FWCfgState *s,  const char *dir, 
const c
    }
    s->files->f[index].size   = cpu_to_be32(len);
    s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
-    fprintf(stderr, "%s: #%d: %s (%d bytes)\n", __FUNCTION__,
-            index, s->files->f[index].name, len);
+    FW_CFG_DPRINTF("%s: #%d: %s (%d bytes)\n", __FUNCTION__,
+                   index, s->files->f[index].name, len);

    s->files->count = cpu_to_be32(index+1);
    return 1;

> Note that I'll be offline for x-mas and newyear starting tomorrow, so 
> I will not be able to work on that until January.

No problem.

> > It's really unclear to me the best way to handle live migration. The
> > rom_offset is not enough because unfortunately it's not stable after
> > invocations of qemu. I think we're going to have to actually save the
> > some contents with the PCIDevices.
>
> With hotplug this will become a issue indeed.

Yup.

> Lets see how this works out in practice ...

BTW, the following works:

sudo x86_64-softmmu/qemu-system-x86_64 -hda ~/images/linux.img -snapshot 
-m 512 -net nic,model=rtl8139,macaddr=56:54:32:12:34:56 -net 
nic,model=e1000,macaddr=56:54:32:12:34:57 -net 
nic,model=virtio,macaddr=56:54:32:12:34:58 -boot menu=on -net tap 
-kernel /boot/vmlinuz-2.6.27.38-170.2.113.fc10.x86_64 -initrd 
/boot/initrd-2.6.27.38-170.2.113.fc10.x86_64.img -append "ro"

Using the F12 menu, I can select any of the three option roms and it 
network boots or I can select 'Legacy Option ROM' and it will boot from 
-kernel.  That is exceedingly cool :-)  We just need to give it a proper 
PnP header and advertise it as a BEV device so that we can give it a 
meaningful name.

Regards,

Anthony Liguori