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Re: [Qemu-devel] Removal of some target CPU macros

From: J. Mayer
Subject: Re: [Qemu-devel] Removal of some target CPU macros
Date: Thu, 08 Nov 2007 21:09:22 +0100

On Thu, 2007-11-08 at 14:09 +0100, Tristan Gingold wrote:
> Two side comments:


> > Note that most (all ?) embedded Freescale PowerPC microcontrollers
> > implement those extensions and that some ones are greatly interrested
> > with having an usable emulation avaible for those CPUs.
> Has anyone started to implement spe ?

Large parts of the SPE extensions are implemented, most fixed-point
operations (but the multiply and add family) and I think almost all
floating-point operations (the flags are not properly emulated, for
now). But there's a lack of a CPU model that would really use it. It
could be made available very easily for a test CPU for user-mode only,
as it is now. The MMU model used on Freescale cores is not implemented
yet, then the full-system emulation would not be possible for now.

> > - someone provide an open-source hypervisor, compatible with the ones
> > used on real machines, that would allow at least Linux to be able  
> > to run
> > on a CPU with hypervisor mode available.
> Does xen/ppc satisfy your requirement ?
> Maybe Hollis will comment.

I don't know really. I guess it may do for the more urgent need which is
to have a  fully "transparent" hypervisor that would enable the OS to
access all resources. I won't bet it could be a replacement for IBM
hypervisor software as the full specifications of this software have
still not be fully released (the PPAR document, which describes the
whole hypervisor features is still a draft).
But it's a good idea, I may take a look of what it could provide.

J. Mayer <address@hidden>
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