Richard Henderson <richard.hender...@linaro.org> writes:
> On 1/14/20 5:09 AM, Alex Bennée wrote: >> This test exercises the gdbstub while runing the sve-iotcl test. I >> haven't plubmed it into make system as we need a way of verifying if >> gdb has the right support for SVE. >> >> Signed-off-by: Alex Bennée <alex.ben...@linaro.org> >> >> --- >> v4 >> - interrogate ZCR_EL1 directly as no longer have vg > > Note that ZCR_EL1 does not give you the correct answer if the hypervisor has > set ZCR_EL2 to something lower. Sure - although this is only a user space test so we are not expecting shenanigans. > Also, ZCR_EL1 it itself not correct if the > hardware does not support all vector sizes. > > See some of Andrew Jones' qemu command-line work. Try -cpu max,sve512=on and > then use the ioctl to set vq to 3 (sve384). The result will be an effective > vq > of 2 (sve256). > > We *really* need vg, as computed from sve_zcr_len_for_el(). How come TARGET_PR_SVE_GET_VL is happy to compute directly from ZCR then? I'll put the vg back in but it seemed a little pointless given the gdbstub ignores it. > > > r~ -- Alex Bennée
