Re: [Qemu-arm] [Qemu-devel] [PATCH 11/13] target/arm/cpu64: max cpu: Introduce sve-vls-map

[Andrew Jones]

On Mon, May 13, 2019 at 05:25:23PM +0200, Markus Armbruster wrote:
> Andrew Jones <address@hidden> writes:
> 
> > Introduce another cpu property to control SVE vector lengths,
> > sve-vls-map, which allows the user to explicitly select the
> > set of vector lengths the guest can use. The map must conform
> > to QEMU's limits and architectural constraints, checked when
> > the property is set. Inconsistencies with sve-max-vq are also
> > checked. The bit number of a set bit in the map represents the
> > allowed vector length in number of quadwords.
> >
> > Note, as the map is implemented with a single 64-bit word we
> > currently only support up to 8192-bit vectors. As QEMU and
> > KVM only support up to 2048-bit vectors then this sufficient
> > now, and probably for some time. Extending the bitmap beyond
> > a single word will likely require changing the property to
> > a string and adding yet another parser to QEMU.
> >
> > Signed-off-by: Andrew Jones <address@hidden>
> 
> Please add an example of how the new property should be used on the
> command line to your commit message.  I'd ask for a documentation update
> as well if we had any to update.

Will do.

Thanks,
drew