[PATCH v2 0/2] Allow userspace to change ID_AA64PFR1_EL1

[Shaoqin Huang <shahuang@redhat.com>]

Allow userspace to change the guest-visible value of the register with
some severe limitation:

  - No changes to features not virtualized by KVM (MPAM_frac, RAS_frac)

Also add the selftest for it.

Changelog:
----------
v1 -> v2:
  * Tackling the full register instead of single field.
  * Changing the patch title and commit message.

RFCv1 -> v1:
  * Fix the compilation error.
  * Delete the machine specific information and make the description more
    generable.

RFCv1: https://lore.kernel.org/all/20240612023553.127813-1-shahuang@redhat.com/
v1: https://lore.kernel.org/all/20240617075131.1006173-1-shahuang@redhat.com/

Shaoqin Huang (2):
  KVM: arm64: Allow userspace to change ID_AA64PFR1_EL1
  KVM: selftests: aarch64: Add writable test for ID_AA64PFR1_EL1

 arch/arm64/kvm/sys_regs.c                         | 3 ++-
 tools/testing/selftests/kvm/aarch64/set_id_regs.c | 9 +++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

-- 
2.40.1