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Re: [Qemu-devel] [PATCH] hw/arm/virt: Reject gic-version=host for non-KV

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] hw/arm/virt: Reject gic-version=host for non-KVM
Date: Fri, 17 Jun 2016 17:31:20 +0100

On 17 June 2016 at 17:10, Richard W.M. Jones <address@hidden> wrote:
> On Fri, Jun 17, 2016 at 03:49:38PM +0100, Peter Maydell wrote:
>> > I agree that we really need to do better here (thinking about
>> > the problem is on my todo list but generally other more pressing
>> > issues intervene). I'd welcome suggestions for semantics which
>> > (a) do what you want (b) are reasonably in line with what we do
>> > on other host architectures (c) don't break existing command lines.
>> > (I think those are the main requirements.)
>> ...so does anybody have any concrete suggestions? We could fix
>> this for 2.7 but we're starting to run low on time for that.
> I have changed libguestfs so it tries to guess if KVM will be used or
> not.  We have to do this for the -cpu option too, but the guess is not
> too reliable.  Only QEMU has the actual knowledge we need.
> https://github.com/libguestfs/libguestfs/commit/7023f20830a681ef36f8f99415fe41791555a3db
> Can we not have a "give me a GIC which will work" option, eg.
>   -M virt,gic-version=besteffort,accel=kvm:tcg
> I don't care if it's not the fastest or most featureful.

Do we also not care if the result is not consistent
between versions of QEMU? (eg if you go from 2.6 to
2.7 does it have to stay doing the same thing it
always did?)

-- PMM

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