Re: [Qemu-devel] [PATCH 0/3] tci rewrite

[Peter Maydell]

On 13 May 2014 22:52, Richard Henderson <address@hidden> wrote:
> On 05/13/2014 02:49 PM, Peter Maydell wrote:
>> Does the TCG interpreter actually have any interesting uses
>> to merit our carrying it around, maintaining it and (in this case)
>> rewriting it? Mostly I just see it when people accidentally configure
>> it and I have to say "don't do that, you really want the native TCG
>> backend".
>
> The only interesting use I can think of is pure portability to otherwise
> unsupported hosts.  Rare these days, but there are still some kicking.

Hosts we care about enough to want to run QEMU really slowly
but not enough to write a TCG backend for?

> When do folks accidentally configure it?

Last one I saw was somebody reading an out of date set of
wiki configuration instructions that were for building a KVM
QEMU on AArch64 back before the TCG backend arrived.
[incidentally that's a problem that would be better solved by
allowing TCG to be disabled completely.]

I think possibly also some people read the configure help
and don't realise that --enable-tcg-interpreter actually means
--disable-sensible-tcg-backend...

thanks
-- PMM