[PATCH v6 0/7] Add support for FEAT_{LS64, LS64_V} and related tests

[Arnd Bergmann]

On Fri, Oct 24, 2025, at 11:08, Zhou Wang wrote:
> Armv8.7 introduces single-copy atomic 64-byte loads and stores
> instructions and its variants named under FEAT_{LS64, LS64_V}.
> Add support for Armv8.7 FEAT_{LS64, LS64_V}:
> - Add identifying and enabling in the cpufeature list
> - Expose the support of these features to userspace through HWCAP3 and cpuinfo
> - Add related hwcap test
> - Handle the trap of unsupported memory (normal/uncacheable) access in a VM
>
> A real scenario for this feature is that the userspace driver can make use of
> this to implement direct WQE (workqueue entry) - a mechanism to fill WQE
> directly into the hardware.
>
> Picked Marc's 2 patches form [1] for handling the LS64 trap in a VM on emulated
> MMIO and the introduce of KVM_EXIT_ARM_LDST64B.
>
> As Yicong has left HiSilicon, I will help to continue to upstream this patchset.
>
> [1] 
> https://lore.kernel.org/linux-arm-kernel/20240815125959.2097734-1-maz@kernel.org/

The patches all look reasonable to me, but I notice that you forgot
to add your signoff below Yicong's, so the Arm maintainers won't be
able to merge the series.

If nobody else has any comments on this version, please resend in
a couple of days with your signoff added to each patch.

     Arnd