linux-kernel - Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

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Date:	Sun, 9 Nov 2008 11:25:05 -0800
From:	Greg KH <greg@...ah.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	"Fischer, Anna" <anna.fischer@...com>, H L <swdevyid@...oo.com>,
	"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
	"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
	"Chiang, Alexander" <achiang@...com>,
	"matthew@....cx" <matthew@....cx>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"rdreier@...co.com" <rdreier@...co.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>
Subject: Re: [PATCH 0/16 v6] PCI: Linux kernel SR-IOV support

On Sun, Nov 09, 2008 at 02:44:06PM +0200, Avi Kivity wrote:
> Greg KH wrote:
>> It's that "second" part that I'm worried about.  How is that going to
>> happen?  Do you have any patches that show this kind of "assignment"?
>>
>>   
>
> For kvm, this is in 2.6.28-rc.

Where?  I just looked and couldn't find anything, but odds are I was
looking in the wrong place :(

> Note there are two ways to assign a device to a guest:
>
> - run the VF driver in the guest: this has the advantage of best 
> performance, but requires pinning all guest memory, makes live migration a 
> tricky proposition, and ties the guest to the underlying hardware.

Is this what you would prefer for kvm?

> - run the VF driver in the host, and use virtio to connect the guest to the 
> host: allows paging the guest and allows straightforward live migration, 
> but reduces performance, and hides any features not exposed by virtio from 
> the guest.

thanks,

greg k-h
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