Re: [Xen-devel] blktap, qdisk, xl cd-eject, and xencommons

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Apr 30, 2013 at 11:02:38AM +0100, George Dunlap wrote:
[...]
> The second is problems with xl cd-insert and eject, initially reported 
> by Fabio Fantoni, and then (accidentally) reproduced by me.  The problem 
> turns out to be libxl using blktap for cdroms.  Basically, AFAICT, the 
> whole cd-insert cd-eject thing completely doen't work if blktap is used 
> to provide it; and it's not a simple fix.
> 
> To address these issue for 4.3, I would like to propose:
> 
> 1. Have libxl default to qdev for everything, except for things that it 
> needs blktap for (like vhd, IIRC)
> 
> 2. Simply remove the hard-coded modprobe from xencommons
> 

Presumably you only mean "modprobe blktap ..."?

> 3. Add code into libxl to do modprobe-ing as part of the "does this 
> system support blktap" check.
> 
> But I think #3 can probably wait until 4.4.
> 

I don't quite understand 2, 3 and the statment "#3 can probably wait
until 4.4". If blktap is necessary for VHD, we can not simply remove the
modprobe while not adding infrastructure in libxl to automatically load
blktap.


Wei.

> Thoughts?
> 
>   -George

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