[PATCH] arm64: Expose AIDR_EL1 via sysfs

[Will Deacon]

On Thu, 03 Apr 2025 16:16:26 -0700, Oliver Upton wrote:
> The KVM PV ABI recently added a feature that allows the VM to discover
> the set of physical CPU implementations, identified by a tuple of
> {MIDR_EL1, REVIDR_EL1, AIDR_EL1}. Unlike other KVM PV features, the
> expectation is that the VMM implements the hypercall instead of KVM as
> it has the authoritative view of where the VM gets scheduled.
> 
> To do this the VMM needs to know the values of these registers on any
> CPU in the system. While MIDR_EL1 and REVIDR_EL1 are already exposed,
> AIDR_EL1 is not. Provide it in sysfs along with the other identification
> registers.
> 
> [...]

Applied to arm64 (for-next/cpufeature), thanks!

[1/1] arm64: Expose AIDR_EL1 via sysfs
      https://git.kernel.org/arm64/c/17efc1acee62

Cheers,
-- 
Will

https://fixes.arm64.dev
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