Re: [Xen-devel] [PATCH 2/2] xen: make start_info x86 specific.

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-02-15 at 13:41 +0000, Jan Beulich wrote:
> >>> On 15.02.13 at 14:24, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > All I actually care about is the removal of struct start_info from the
> > canonical copy of the hypervisor ABI (that is xen/include/public) for
> > ARM.
> 
> But as already said - to me this looks wrong. The structure has
> generally useful fields (and unless ARM uses _none_ of them,

This is right, ARM uses none of them, at the hypervisor ABI level at
least. There's actually no way to pass a start info to an ARM guest
because they are launched via the native code paths.

> then it must have some other way to communicate the respective
> stuff, in which case I'd ask why a second mechanism got invented
> when there already was one available), and even more so from
> the abstract PV perspective.

ARM uses HVM params (e.g. the xenstore and console ring + evtchn) and
XENFEAT_dom0 etc (for privilegedness).

I guess it is obvious why HVM params were needed on HVM and you invented
XENFEAT_dom0 IIRC :-)

Ian.


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