FEAT_LSFE is optional from v9.5, it adds new instructions for atomic
memory operations with floating point values.  We have no immediate use
for it in kernel, provide a hwcap so userspace can discover it and allow
the ID register field to be exposed to KVM guests.

Signed-off-by: Mark Brown <[email protected]>
---
Changes in v4:
- Rebase onto arm64/for-next/cpufeature, note that both patches have
  build dependencies on this.
- Drop unneeded cc clobber in hwcap.
- Use STRFADD as the instruction probed in hwcap.
- Link to v3: 
https://lore.kernel.org/r/[email protected]

Changes in v3:
- Rebase onto v6.17-rc1.
- Link to v2: 
https://lore.kernel.org/r/[email protected]

Changes in v2:
- Fix result of vi dropping in hwcap test.
- Link to v1: 
https://lore.kernel.org/r/[email protected]

---
Mark Brown (2):
      KVM: arm64: Expose FEAT_LSFE to guests
      kselftest/arm64: Add lsfe to the hwcaps test

 arch/arm64/kvm/sys_regs.c                 |  4 +++-
 tools/testing/selftests/arm64/abi/hwcap.c | 21 +++++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)
---
base-commit: 220928e52cb03d223b3acad3888baf0687486d21
change-id: 20250625-arm64-lsfe-0810cf98adc2

Best regards,
--  
Mark Brown <[email protected]>


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