Re: [Xen-devel] [RFC PATCH 0/3] xen/privcmd: support for paged-out frames

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-08-24 at 12:58 +0100, David Vrabel wrote:
> Is PRIVCMD_MMAPBATCH_V2 actually required?  It doesn't seem to do much
> more than the V1 interface.  Perhaps the fix in patches #1 and #2
> sufficient to make libxc work?

The V1 interface has some hideous misfeature wrt error reporting iirc.

It doesn't report the actual per-frame error code, just the "an error"
signal through setting the top nibble (already a nasty interface!), IIRC

Aha: http://xenbits.xen.org/hg/linux-2.6.18-xen.hg/rev/6d6c3dd995c0

It was knackered on 64 bit (actually set bits 28-31...)...

Ian.


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