Re: [Qemu-devel] [PATCH v2 0/5] Removal of deprecated -no-kvm* options

[Paolo Bonzini <pbonzini@redhat.com>]

On 07/05/2018 13:56, Markus Armbruster wrote:
> Adding more and more ways to do the same stuff does not improve an
> interface.  Interface design needs to be *opinionated*.  If we decide
> -machine accel=tcg isn't a nice interface, by all means create a better
> one, but as replacement[*], not as addition.
> 
> Furthermore:
> 
>     tcg: add options for enabling MTTCG
> 
>     We know there will be cases where MTTCG won't work until additional work
>     is done in the front/back ends to support. It will however be useful to
>     be able to turn it on.
> 
>     As a result MTTCG will default to off unless the combination is
>     supported. However the user can turn it on for the sake of testing.
> 
>     Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>
>     [AJB: move to -accel tcg,thread=multi|single, defaults]
>     Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>     Reviewed-by: Richard Henderson <rth@twiddle.net>
> 
> I'm sorry, but this us sub-par.  Yes, the commit is also about "enabling
> MTTCG", but it also adds a new way to select accelerators, without ever
> spelling that out.  It should've been split, and properly described.

Perhaps we can deprecate "-M accel" then, and also while we're at it
move kernel_irqchip from -machine to "-accel kvm" where it belongs?

Paolo