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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4A8D20BB.7020008@redhat.com>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/