[PATCH 0/2] KVM: arm64: AT + SR accessor fixes

[Marc Zyngier <maz@kernel.org>]

Volodymyr having reported[1] a couple of rather interesting bugs while
running Xen under KVM, here's a couple of patches to plug these
issues:

- a fix for ATS12 stopping the walk at S1 under the wrong conditions

- a much larger fix for the vcpu_{read,write}_sys_reg() accessors,
  fixing the fate of TPIDR*_EL{0,1} and PAR_EL1, and overall becoming
  much easier to work with

The latter is a pretty large change, but is worth it IMO as it makes
everything much more straightforward.

Volodymyr, I'd very much welcome your feedback on those, as despite my
best effort, I didn't manage to even boot Debian's packaging of Xen
(Grub just refuses to run *anything* after Xen being installed -- I
guess it's not tested at all).

[1] https://lore.kernel.org/r/20250806141707.3479194-1-volodymyr_babchuk@epam.com

Marc Zyngier (2):
  KVM: arm64: nv: Fix ATS12 handling of single-stage translation
  KVM: arm64: Fix vcpu_{read,write}_sys_reg() accessors

 arch/arm64/include/asm/kvm_host.h |   4 +-
 arch/arm64/kvm/at.c               |   6 +-
 arch/arm64/kvm/sys_regs.c         | 243 +++++++++++++++---------------
 3 files changed, 130 insertions(+), 123 deletions(-)

-- 
2.39.2