Re: [KVM PATCH] pci passthrough: zap option rom scanning.

[Alexander Graf <agraf@suse.de>]

Marcelo Tosatti wrote:
> On Wed, Jan 20, 2010 at 11:58:48AM +0100, Gerd Hoffmann wrote:
>   
>> Nowdays (qemu 0.12) seabios loads option roms from pci rom bars.  So
>> there is no need any more to scan for option roms and have qemu load
>> them.  Zap the code.
>>
>> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>>     
>
> Applied, thanks.
>   

Without this patch (0.12.3) I get the following error message when
trying to pass 2 functions of an ixgbe adapter to the guest:

falla:/abuild/agraf/qemu-kvm/:[0]# qemu-kvm -pcidevice host=07:00.0
-pcidevice host=07:00.1 -nographic -append console=ttyS0 -kernel
/boot/vmlinuz.x -initrd /boot/initrd.x
device: 07:00.0: driver="pci-assign" host="07:00.0"
device: 07:00.1: driver="pci-assign" host="07:00.1"
rom: requested regions overlap (rom 07:00.1. free=0x000000000000ac00,
addr=0x0000000000000000)
rom loading failed


The same code works with qemu-kvm.git. Cherry picking this commit
(51c0dad5ce383be94ca7c46e491ada17cc9ec416) also makes it work in
0.12-stable.


Thus I'd incline we also take this patch into 0.12-stable.


Alex