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[v2,0/4] KVM: arm64: writable MIDR/REVIDR

Message ID 20250211143910.16775-1-sebott@redhat.com (mailing list archive)
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Series KVM: arm64: writable MIDR/REVIDR | expand

Message

Sebastian Ott Feb. 11, 2025, 2:39 p.m. UTC 
Based on prior discussion [1] this series allows VMMs to change
MIDR/REVIDR to enable migration between machines that differ in
these registers. Since these are used for errata handling the
errata management series [2] is a prerequisite for this one.

changes for V2:
* let the guest actually observe the changed MIDR_EL1 value
* extra .set_user function
* added selftest

[1] https://lore.kernel.org/kvmarm/20250124151732.6072-1-shameerali.kolothum.thodi@huawei.com/T/#mb855bc51714095a164a7b26bb8bead1606e4b753
[2] https://lore.kernel.org/kvmarm/20250205132222.55816-1-shameerali.kolothum.thodi@huawei.com/T/

Sebastian Ott (4):
  KVM: arm64: Allow userspace to change MIDR_EL1
  KVM: arm64: Allow userspace to change REVIDR_EL1
  KVM: arm64: Allow userspace to change AIDR_EL1
  KVM: selftests: arm64: Test writes to MIDR,REVIDR,AIDR

 arch/arm64/include/asm/kvm_host.h             |   9 ++
 arch/arm64/kvm/sys_regs.c                     | 151 ++++++++----------
 .../testing/selftests/kvm/arm64/set_id_regs.c |  32 +++-
 3 files changed, 100 insertions(+), 92 deletions(-)