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Re: [Xen-devel] Re: [PATCH] Replace bios_relocate hook with bios_load ho

To: Keir Fraser <keir.xen@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH] Replace bios_relocate hook with bios_load hook in hvmloader
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Wed, 27 Jul 2011 09:45:22 +0100
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jordan Justen <jljusten@xxxxxxxxx>, Bei Guan <gbtju85@xxxxxxxxx>, Andrei Warkentin <andreiw@xxxxxxxxxxxx>
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At 09:35 +0100 on 27 Jul (1311759322), Keir Fraser wrote:
> On 27/07/2011 09:09, "Tim Deegan" <Tim.Deegan@xxxxxxxxxx> wrote:
> > At 08:34 +0100 on 27 Jul (1311755670), Keir Fraser wrote:
> >> By the way, what are the advantages for us of supporting OVMF? I know it
> >> gets us the UEFI support tickybox, but for me that begs the same question.
> >> Why is it useful?
> > 
> > When Windows boots from UEFI it can load just its system-disk driver via
> > the firmware and the rest of the OS using its own driver; that ought to
> > make Windows boot times much faster.
> That's interesting. Why can't it do that with legacy firmware? Does it need
> to keep the legacy BIOS alive for a while and hence can't use its own
> drivers, or something like that?

I don't think it's "can't" so much as "doesn't". :)  We'd get much of
the same speedup from PV drivers in the ROMBIOS, of course.

Oh, and I think Mac OS X relies on EFI to boot, doesn't it?  Among other
things, of course.


Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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