linux-kernel - Re: [PATCH RFC] virtio-spec: flexible configuration layout

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Date:	Wed, 9 Nov 2011 17:33:14 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Amit Shah <amit.shah@...hat.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Krishna Kumar <krkumar2@...ibm.com>,
	Pawel Moll <pawel.moll@....com>,
	Wang Sheng-Hui <shhuiw@...il.com>,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	avi@...hat.com, penberg@...helsinki.fi
Subject: Re: [PATCH RFC] virtio-spec: flexible configuration layout

On Wed, Nov 09, 2011 at 02:36:43PM +0200, Pekka Enberg wrote:
> On Wed, 9 Nov 2011, Sasha Levin wrote:
> >They don't exist in kernel code either, for same reason as above.
> >
> >Nothing will break if we remove it since no one really used it, we were
> >probably the first and only implementation of the spec which considered
> >them :)
> 
> As long as we are able to run older versions of the KVM tool with
> newer kernels and vice versa, I see no reason why we can't drop 64-bit
> features from the KVM tool.
> 
> 			Pekka

What do these older versions do? Do they *set* bit 31 in the
features register?

-- 
MST
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