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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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).

> 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.

Jan


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