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

[Keir Fraser <keir.xen@xxxxxxxxx>]

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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