[PATCH v2 0/3] KVM: arm64: make EL2 feature fields writable in ID_AA64MMFR1_EL1

[Jinqian Yang]

Allow userspace to downgrade EL2 features (VH, TWED, HCX) to ensure VM live
migration compatibility between hosts with varying feature support.

v1: https://lore.kernel.org/linux-arm-kernel/20250325121126.1380681-1-yangjinqian1@huawei.com/

Change Log:
v1->v2:
  -Added support for downgrading TWED and VH fields.
  -Added corresponding test cases to the set_id_regs selftest.

Jinqian Yang (3):
  KVM: arm64: Make ID_AA64MMFR1_EL1.HCX writable from userspace
  KVM: arm64: Make ID_AA64MMFR1_EL1.TWED writable from userspace
  KVM: arm64: Make ID_AA64MMFR1_EL1.VH writable from userspace

 arch/arm64/kvm/sys_regs.c                       | 3 ---
 tools/testing/selftests/kvm/arm64/set_id_regs.c | 3 +++
 2 files changed, 3 insertions(+), 3 deletions(-)

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2.33.0