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From: Mark W. <ma...@kl...> - 2019-08-08 21:54:37
|
Hi Andreas, On Wed, 2019-08-07 at 12:52 +0200, Andreas Arnez wrote: > On Tue, Aug 06 2019, Mark Wielaard wrote: > > The issue doesn't seem to be with this patch. But with the specific > > setup of the machine, it is a RHEL7 based setup, where it seems the > > kernel doesn't setup the vector capability, but the machine does > > have the vx facility. > > > > That seems to cause our tests prereq to think it can run the vector > > instructions, but when the actual vector* tests run the > > instructions fail because the kernel hasn't enabled them. > > Right. That kind of discrepancy is specific to certain hardware > features that need support by the hypervisor and OS. VX is one of > those, because it requires additional registers to be maintained. > > > So it seems we need to make tests/s390x_features s390x-vx smarter. > > Yes, we should. I suggest the patch below. Instead of relying on > the CPU facility list, the patch checks the HWCAP, where the kernel > officially indicates full VX support. Any thoughts? Checking AT_HWCAP seems like a good idea. But is glibc 2.16 universal enough? Since this is just for adding a vgtest prereq you could also do what tests/check_ppc64_auxv_cap with a shell script. There are only 4 vgtests that use the s390x-vx prereq, which would then have to be changed to use the new script. It might be that glibc 2.16/getauxval is just fine to use though. Systems that have an older glibc might just not have the vx capability in the first place. If so then just use what you have. But do please add a comment on this line: > match = GET_HWCAP() & 0x800; Thanks, Mark |