On Mon, Jul 26, 2021 at 08:33:52AM -1000, Richard Henderson wrote: > On 7/26/21 4:59 AM, Andrew Jones wrote: > > > +SVE User-mode Default Vector Length Property > > > +-------------------------------------------- > > > + > > > +For qemu-aarch64, the cpu property `sve-default-vector-length=N` is > > > +defined to mirror the Linux kernel parameter file > > > +`/proc/sys/abi/sve_default_vector_length`. The default length, `N`, > > > +is in units of bytes and must be between 16 and 8192. > > > > Hmm. If a user inputs anything greater than 256, then won't it get > > silently reduced to 256? > > Yes. > > > > +If not specified, the default vector length is 64. > > > + > > > +If the default length is larger than the maximum vector length enabled > > > +with `sve<N>` properties, the actual vector length will be reduced. > > > > Here it's pointed out that the default may be reduced, but it implies that > > that only happens if an sve<N> property is also given. Won't users wonder > > why they're only getting vectors that are 256 bytes large even when they > > ask for more? > > I guess adding that 256 is the maximum length supported by qemu should be > sufficient? >
Works for me. Thanks, drew
