Re: [Xen-devel] [PATCH V4 02/15] Move x86 specific funtions/variables to arch header

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-09-12 at 10:53 +0100, Jan Beulich wrote:
> >>> On 12.09.14 at 11:43, <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Fri, 2014-09-12 at 08:04 +0100, Jan Beulich wrote:
> >> > This does scanning of PCI ROMS, which is unlikely to do anything
> >> > useful on ARM platforms.
> >> 
> >> Why not? Obviously if the ROMs contain x86 code, they're useless,
> >> but in order to, say, do remote boot I suppose you need option
> >> ROMs (with ARM code) on ARM too.
> > 
> > Doesn't that all happen at the UEFI layer, long before Xen gets
> > involved, even on x86?
> 
> The purpose of the code here isn't for ourselves, but for onward
> reporting to Dom0 (via XEN_FW_EFI_PCI_ROM).

Ah, makes sense.

> > Does Xen itself do network boot/loading or does it call some UEFI layer?
> 
> Iiuc Xen would support remote boot right now only if there was a
> file system protocol exposed allowing to read in the necessary
> files. Anything requiring explicit awareness of that fact is currently
> missing.

Right. So behind some UEFI layer.


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