Re: [Xen-devel] [PATCH] QEMU: remove blktap when building for NetBSD

[Roger Pau Monné <roger.pau@xxxxxxxxxxxxx>]

>> Applied to qemu-xen-unstable.git.  Is there a need for a similar patch
>> to qemu upstream ?
>
> I don't think upstream qemu has (or will/should have) any blktap
> support.

>From what I saw, there's nothing blktap related in qemu-upstream.

> Having said that it's not exactly clear what, if anything, this blktap
> support in qemu-xen is actually used for... It looks a bit like once
> upon time it was an option to use qemu to provide the blktap (v1)
> userspace backend instead of the tapdisk process (look for qemu and
> use_ioemu in tools/blktap/drivers/blktapctrl.c). This functionality does
> not appear to be present in blktap2.

I've looked at the sources of qemu-unstable, and it seems the only
function that was called from the blktap library was init_blktap, but
no blktap backend was used anywhere in the qemu code, so I think it's
safe to remove blktap from qemu after all.

Could this be applied to qemu-xen-4.1-testing?

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