Re: [Xen-devel] [PATCH] xencommons: Attempt to load blktap driver

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-05-15 at 16:49 +0100, George Dunlap wrote:
> Older kernels, such as those found in Debian Squeeze:
> * Have bugs in handling of AIO into foreign pages
> * Have blktap modules, which will cause qemu not to use AIO, but
> which are not loaded on boot.
> 
> Attempt to load blktap in xencommons, to make sure modern qemu's which
> use AIO will work properly on those kernels.
> 
> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

Rereading the thread which this patch spawned I think the conclusion was
that we should take this patch (or a version of it) for 4.2. I think the
"or a version of it" refers to the selection of the precise set of names
which we need to try to get the best chance of loading something useful.
But I'm not sure what the conclusion was in that regard.

Ian.

> 
> diff -r 99244350516a -r db614e92faf7 tools/hotplug/Linux/init.d/xencommons
> --- a/tools/hotplug/Linux/init.d/xencommons   Tue May 15 16:48:49 2012 +0100
> +++ b/tools/hotplug/Linux/init.d/xencommons   Tue May 15 16:49:32 2012 +0100
> @@ -59,6 +59,7 @@ do_start () {
>       modprobe evtchn 2>/dev/null
>       modprobe gntdev 2>/dev/null
>       modprobe xen-acpi-processor 2>/dev/null
> +     modprobe blktap 2>/dev/null
>       mkdir -p /var/run/xen
>  
>       if ! `xenstore-read -s / >/dev/null 2>&1`
> 
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> http://lists.xen.org/xen-devel



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