Re: [kvm-devel] [RFC] virtio-blk PCI backend

[Avi K. <av...@qu...>]

Christian Borntraeger wrote:
> Am Freitag, 9. November 2007 schrieb Dor Laor:
>   
>> I believe that the network interface will quickly go to the kernel since 
>> copy takes most of the
>> cpu time and qemu does not support scatter gather dma at the moment.
>> Nevertheless using pio seems good enough, Anthony's suggestion of 
>> notifying the kernel using ioctls
>> is logical. If we'll run into troubles further on we can add a hypercall 
>> capability and if exist use hypercalls
>> instead of pios.
>>     
>
> Sorry for being late in this thread.
> We (s390) will need a hypercall as we do not have port I/O. I think it should be
> possible to default to hypercall on s390 and use pio everywhere else.
>   

Or be generic: advertise the methods available according to host 
(kvm/x86, qemu/x86, kvm/s390) and let the guest pick.

-- 
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