Re: [Qemu-arm] [Qemu-devel] [PATCH 00/13] target/arm/kvm: enable SVE in guests

[Andrea Bolognani]

On Tue, 2019-05-14 at 13:14 -0700, Richard Henderson wrote:
> On 5/14/19 9:03 AM, Andrea Bolognani wrote:
> > On Tue, 2019-05-14 at 14:53 +0200, Andrew Jones wrote:
> > > We already have sve-max-vq, so I'm not sure we want to rename it.
> > 
> > Oh, I didn't realize that was the case. And of course it already
> > takes a number of quadwords as argument, I suppose? That's pretty
> > unfortunate :(
> > 
> > Perhaps we could consider deprecating it in favor of a user-friendly
> > variant that's actually suitable for regular humans, like the one I
> > suggest above?
> 
> Why is =4 less user-friendly than =512?
> 
> I don't actually see "total bits in vector" as more user-friendly than "number
> of quadwords" when it comes to non-powers-of-2 like =7 vs =896 or =13 vs 
> =1664.

I would wager most people are intimately familiar with bits, bytes
and multiples due to having to work with them daily. Quadwords, not
so much.

-- 
Andrea Bolognani / Red Hat / Virtualization