[PATCH v2 0/4] selftests: arm64: vec-syscfg updates

[Will Deacon]

On Fri, Sep 17, 2021 at 01:08:51PM +0100, Mark Brown wrote:
> This series fixes up a few issues introduced into vec-syscfg during
> refactoring in the review process, then adds a new test which ensures
> that the behaviour when we attempt to set a vector length which is not
> supported by the current system matches what is documented in the SVE
> ABI documentation.
> 
> v2:
>  - Fix handling of missing VLs when checking that vector length setting
>    works as expected.

With this series applied, I see a test failing under qemu with:

# selftests: arm64: vec-syscfg
# TAP version 13
# 1..10
# ok 1 SVE default vector length 64
# ok 2 # SKIP Need to be root to write to /proc
# ok 3 # SKIP Need to be root to write to /proc
# ok 4 SVE current VL is 64
# ok 5 SVE set VL 64 and have VL 64
# ok 6 # SKIP SVE only one VL supported
# ok 7 # SKIP SVE only one VL supported
# ok 8 # SKIP SVE only one VL supported
# ok 9 # SKIP SVE only one VL supported
# # SVE VL 272 returned 256 not maximum 0
# # SVE VL 288 returned 256 not maximum 0
# # SVE VL 304 returned 256 not maximum 0
# # SVE VL 320 returned 256 not maximum 0
# # SVE VL 336 returned 256 not maximum 0
# # SVE VL 352 returned 256 not maximum 0

[repeat similar messages for ages]

  # SVE VL 8160 returned 256 not maximum 0
# # SVE VL 8176 returned 256 not maximum 0
# # SVE VL 8192 returned 256 not maximum 0
# not ok 10 SVE prctl() set all VLs, 496 errors
# # Totals: pass:3 fail:1 xfail:0 xpass:0 skip:6 error:0

Will