netdev - Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server

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Message-ID: <20090914164750.GB3745@redhat.com>
Date:	Mon, 14 Sep 2009 19:47:50 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	"Ira W. Snyder" <iws@...o.caltech.edu>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu, linux-mm@...ck.org,
	akpm@...ux-foundation.org, hpa@...or.com,
	Rusty Russell <rusty@...tcorp.com.au>, s.hetze@...ux-ag.com
Subject: Re: [PATCHv5 3/3] vhost_net: a kernel-level virtio server

On Mon, Sep 14, 2009 at 12:08:55PM -0400, Gregory Haskins wrote:
> For Ira's example, the addresses would represent a physical address on
> the PCI boards, and would follow any kind of relevant rules for
> converting a "GPA" to a host accessible address (even if indirectly, via
> a dma controller).

I don't think limiting addresses to PCI physical addresses will work
well.  From what I rememeber, Ira's x86 can not initiate burst
transactions on PCI, and it's the ppc that initiates all DMA.

> 
> >  But we can't let the guest specify physical addresses.
> 
> Agreed.  Neither your proposal nor mine operate this way afaict.

But this seems to be what Ira needs.

> HTH
> 
> Kind Regards,
> -Greg
> 


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