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Re: [Xen-devel] [PATCH 2 of 3] Enable UEFI BIOS(OVMF) support in Xen-uns

To: Jordan Justen <jljusten@xxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 2 of 3] Enable UEFI BIOS(OVMF) support in Xen-unstable HVM
From: Keir Fraser <keir.xen@xxxxxxxxx>
Date: Tue, 09 Aug 2011 22:27:08 +0100
Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Andrei Warkentin <andreiw@xxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Bei Guan <gbtju85@xxxxxxxxx>
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Thread-topic: [Xen-devel] [PATCH 2 of 3] Enable UEFI BIOS(OVMF) support in Xen-unstable HVM
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On 09/08/2011 21:54, "Jordan Justen" <jljusten@xxxxxxxxx> wrote:

>> I assume a native box would only have one UEFI firmware, and that would be
>> X64 on an x86/64 box. You must still be able to boot IA32 operating systems
>> on the X64 firmware, right?
> 
> Yes, it could technically be booted, if the OS loader was an X64
> application that transitioned to IA32 before starting the OS kernel.
> 
> But, the IA32 OS would then have issues if it wanted to call UEFI
> runtime services, which would be X64.

Yes, fair enough really, unless you had some dual-payload firmware which
installed services appropriate to the OS type it has loaded. But such a
thing obviously doesn't exist. :-) The two config parameters are fine, given
how UEFI/OVMF works.

 -- Keir



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