From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@eu.citrix.com>
Subject: Re: [PATCH RFC] make error codes a formal part of the
 ABI
Date: Wed, 14 Jan 2015 11:24:23 +0000
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To: Julien Grall <julien.grall@linaro.org>
Cc: Keir Fraser <keir@xen.org>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Tim Deegan <tim@xen.org>, Jan Beulich <JBeulich@suse.com>, xen-devel <xen-devel@lists.xenproject.org>, Ian Jackson <Ian.Jackson@eu.citrix.com>, Roger Pau =?ISO-8859-1?Q?Monn=E9?= <roger.pau@citrix.com>
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On Wed, 2015-01-14 at 10:52 +0000, Julien Grall wrote:
> Hi Ian,
> 
> On 14/01/2015 10:28, Ian Campbell wrote:
> >>> (I suppose someone needs to patch libxc et al to actually use this)
> >>
> >> The primary consumer, as said in the description, is meant to be
> >> hvmloader. But yes, other tools parts may also want to follow
> >> that.
> >
> > /me wonders how libxc has been getting away with out this until now,
> > especially on non-Linux platforms.
> 
> On FreeBSD, we translate the XEN errno to the guest one in the privcmd 
> drivers.

Ah, I looked in tools/libxc/*bsd* but didn't think to look in the kernel
itself.

> See 
> http://xenbits.xen.org/gitweb/?p=people/royger/freebsd.git;a=patch;h=f09eeed01bc884b37e978f6ec6e3e7a86778ef4b

OK, so essentially the requirement is that libxc should see the guest's
own ERRNO numbers and changing libxc to use xen's numbers would just be
wrong.

Which is good, because making that change would be a nightmare!

Ian.