Re: [Xen-devel] [PATCH 3/3] xen/privcmd: add PRIVCMD_MMAPBATCH_V2 ioctl

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-08-24 at 13:00 +0100, David Vrabel wrote:
> 64 bit Xen, 64 bit dom0, 32 bit tools has never worked for this reason.
>  I think Ian Campbell had some hacky patches for this but he may not
> want to admit to them. ;)

They were pretty nasty.

I think I made a 32-bit hypercall entry path available to 64 bit kernels
(via int 0x8?) so privcmd used that for 32 bit tasks. Then there was
some hacking to make the hypercall compat arg translation area work for
64 bit guests (I don't remember what I did here, I seem to recall it
wasn't pretty)

I eventually fell at the hurdle of getting 64 bit blktap kernel module
to work with 32 bit tapdisk process (since the ring layouts are
different). Not an impossible problem but at this poiint I couldn't be
bothered any more.

> 
> David



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