Message-ID: <49D65647.2000502@novell.com>
Date: Fri, 03 Apr 2009 14:32:39 -0400
From: Gregory Haskins <ghaskins@novell.com>
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To: Chris Wright <chrisw@sous-sol.org>
CC: Avi Kivity <avi@redhat.com>, Patrick Mullaney <pmullaney@novell.com>,
       anthony@codemonkey.ws, andi@firstfloor.org, herbert@gondor.apana.org.au,
       Peter Morreale <PMorreale@novell.com>, rusty@rustcorp.com.au,
       agraf@suse.de, kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
Subject: Re: [RFC PATCH 00/17] virtual-bus
References: <49D469D2020000A100045FA1@lucius.provo.novell.com> <49D473EA020000C700056627@lucius.provo.novell.com> <49D473EA020000C700056627@lucius.provo.novell.com> <49D4CB38.5030205@redhat.com> <49D4DA54.3090401@novell.com> <49D4DE82.5020306@redhat.com> <49D4F97F.6040507@novell.com> <49D5F669.1070502@redhat.com> <49D6240B.4080809@novell.com> <20090403170920.GM18394@sequoia.sous-sol.org>
In-Reply-To: <20090403170920.GM18394@sequoia.sous-sol.org>
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Chris Wright wrote:
> * Gregory Haskins (ghaskins@novell.com) wrote:
>  =20
>> Let me ask you this:  If you had a clean slate and were designing a
>> hypervisor and a guest OS from scratch:  What would you make the bus
>> look like?
>>    =20
>
> Well, virtio did have a relatively clean slate. And PCI (as _one_
> transport option) is what it looks like.  It's not the only transport
> (as Avi already mentioned it works for s390, for example).
>  =20

Got it.  Thanks.

> BTW, from my brief look at vbus, it seems pretty similar to xenbus.
>  =20

If you are referring to the guest side interface, it was actually
inspired by lguest's bus (I forget what Rusty called it now, though). =20
I think I actually declared that in the original patch series I put out
1.5 years ago, but I might have inadvertently omitted that on this
go-round.

I think XenBus is more of an event channel infrastructure, isn't it?=20
But in any case, I think the nature of getting PV drivers into a guest
is relatively similar, so I wouldn't be surprised if there were
parallels in quite a few of the implementations.  In fact, I chose a
generic name like "vbus" in hopes that it could be used across different
hypervisors. :)

-Greg


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