RE: [Xen-devel] feature request - prevent user stupidity (eg mine)

["Ian Pratt" <Ian.Pratt@xxxxxxxxxxxx>]

> (the type was that the same Dom0 block device is used twice in the
first
> example)
> 
> Which was working great until I did a 'mkswap /dev/hda2' inside the
> domain, which really fscked things up :(
> 
> Given that there is almost no way you would ever want to publish the
> same block device to the same virtual domain more than once, would
there
> be any value in flagging that as an error when you try and start the
> domain?

I'm surprised that the existing block device safety checks don't pick up
on this, but I guess they're run before the guest is started rather than
before each virtual disk is attached.

I certainly think there's a strong argument for protecting the user from
this kind of error, at least unless they've specified 'w!' and hence
indicated they want sharing.

Anyone care to knock up a patch?

Best,
Ian

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