linux-kernel - Re: [kvm-devel] [PATCH 3/3] virtio PCI device

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Message-ID: <47339F20.6010602@qumranet.com>
Date:	Fri, 09 Nov 2007 01:43:28 +0200
From:	Dor Laor <dor.laor@...il.com>
To:	Anthony Liguori <aliguori@...ibm.com>
CC:	Avi Kivity <avi@...ranet.com>,
	Rusty Russell <rusty@...ycorp.com.au>,
	virtualization@...ts.osdl.org, linux-kernel@...r.kernel.org,
	kvm-devel@...ts.sourceforge.net
Subject: Re: [kvm-devel] [PATCH 3/3] virtio PCI device

Anthony Liguori wrote:
> Avi Kivity wrote:
>   
>> Anthony Liguori wrote:
>>   
>>     
>>> This is a PCI device that implements a transport for virtio.  It allows virtio
>>> devices to be used by QEMU based VMMs like KVM or Xen.
>>>
>>>   
>>>     
>>>       
>> Didn't see support for dma.
>>     
>
> Not sure what you're expecting there.  Using dma_ops in virtio_ring?
>
>   
>>  I think that with Amit's pvdma patches you
>> can support dma-capable devices as well without too much fuss.
>>   
>>     
>
> What is the use case you're thinking of?  A semi-paravirt driver that 
> does dma directly to a device?
>
> Regards,
>
> Anthony Liguori
>
>   
You would also lose performance since pv-dma will trigger an exit for 
each virtio io while
virtio kicks the hypervisor after several IOs were queued.
>
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>   

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