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Re: [Qemu-devel] [RFC PATCH 05/21] target-arm: add CPU Monitor mode

From: Peter Maydell
Subject: Re: [Qemu-devel] [RFC PATCH 05/21] target-arm: add CPU Monitor mode
Date: Wed, 4 Dec 2013 11:18:44 +0000

On 4 December 2013 10:58, Peter Crosthwaite
<address@hidden> wrote:
> So what im proposing is just a slightly more general patch. Is it
> really any more complicated than just applying your change pattern for
> the hyp mode?

I think it would be, because of the wrinkle that hyp mode doesn't
have a banked LR, so the existing "assume we can just translate
the mode into a single index good for both LR and SP" logic
would break.

The minimal change if we wanted to keep VMSD bumps to a
minimum would be to increase the size of the banked_spsr[]
and banked_r13[] arrays to allow for Hyp mode but do nothing
else (except add a comment about it I guess).

> The motiviation is less VMSD version bumps in ARM CPU (a place where I
> expect assume such version bumps to be considerable annoyance).

Well, they're only a problem at the point where we start trying
to support cross-version migration; we're not at that point yet...

-- PMM

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