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Date: Wed, 04 Aug 2010 09:56:56 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with
	Linux 2.6.35?
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To: Avi Kivity <avi@redhat.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org, Gleb Natapov <gleb@redhat.com>, "Richard W.M. Jones" <rjones@redhat.com>

   Hi,

>> (1) -M somethingold. PCI devices don't have a pci rom bar then by
>> default because they didn't not have one in older qemu versions,
>> so we need some other way to pass the option rom to seabios.
>
> What did we do back then? before we had the fwcfg interface?

Have qemu instead of bochs/seabios manage the vgabios/optionrom area 
(0xc8000 -> 0xe0000) and copy the roms to memory.  Which implies the 
whole rom has to sit there as PMM can't be used then.

>> (3) roms not associated with a PCI device: multiboot, extboot,
>> -option-rom command line switch, vgabios for -M isapc.
>
> We could lay those out in high memory (4GB-512MB) and have the bios copy
> them from there.

Yea, we could.  But it is pointless IMHO.

$ ls -l *.bin
-rwxrwxr-x. 1 kraxel kraxel 1536 Jul 15 15:51 extboot.bin*
-rwxrwxr-x. 1 kraxel kraxel 1024 Jul 15 15:51 linuxboot.bin*
-rwxrwxr-x. 1 kraxel kraxel 1024 Jul 15 15:51 multiboot.bin*
-rwxrwxr-x. 1 kraxel kraxel 8960 Jul 15 15:51 vapic.bin*

That are the ones we can't load via pci rom bar.  Look how small they are.

cheers,
   Gerd