[Xen-devel] Re: [PATCH] pv-grub: fix boot crash when no fb is available

[Daniel Stodden <daniel.stodden@xxxxxxxxxx>]

On Tue, 2010-04-06 at 15:17 -0400, Jeremy Fitzhardinge wrote:
> On 04/06/2010 11:22 AM, David P. Quigley wrote:
> > I'm under the impression that if you just do tap:aio it instantiates a
> > blktap device not a blktap2 device. There are definitely different
> > blktap controller classes in xend which handle entries using tapdisk and
> > ones just using tap.
> >    
> 
> The pvops dom0 doesn't have blktap support, only blktap2 (unless blktap2 
> does a back-compat thing?).  

No blktap1, and no compat layer. It's all blkback instances sitting on a
blktap2 node, which provides a block device node.

The disk I'm running for development purposes is set up as follows:

disk = [ "tap:tapdisk:aio:/var/tmp/lenny.ext,xvda,w" ]

Took me a while to figure the syntax out, not sure if different ones
like yours work too.

> Or maybe it falls back to plain blkback?

Could be... What major number do you see in the physical-device XS node?

That config thing is clearly a nightmare.

Daniel



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