linux-kernel - Re: [Alacrityvm-devel] [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus

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Date:	Thu, 20 Aug 2009 13:08:59 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Stefan Hajnoczi <stefanha@...il.com>
CC:	Hollis Blanchard <hollisb@...ibm.com>,
	"Ira W. Snyder" <iws@...o.caltech.edu>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Gregory Haskins <gregory.haskins@...il.com>,
	kvm@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	alacrityvm-devel@...ts.sourceforge.net,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <ghaskins@...ell.com>
Subject: Re: [Alacrityvm-devel] [PATCH v3 3/6] vbus: add a "vbus-proxy" bus
 	model for vbus_driver objects

On 08/20/2009 12:57 PM, Stefan Hajnoczi wrote:
> Cross-platform virtio works when endianness is known in advance.  For
> a hypervisor and a guest:
> 1. virtio-pci I/O registers use PCI endianness
> 2. vring uses guest endianness (hypervisor must byteswap)
> 3. guest memory buffers use guest endianness (hypervisor must byteswap)
>
> I know of no existing way when endianness is not known in advance.
> Perhaps a transport bit could be added to mark the endianness of the
> guest/driver side.  This can be negotiated because virtio-pci has a
> known endianness.  After negotiation, the host knows whether or not
> byteswapping is necessary for structures in guest memory.
>
>    

Some processors are capable of switching their gender at runtime, so you 
cannot tell the guest endianness in advance.

-- 
error compiling committee.c: too many arguments to function

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