[PATCH v2 0/3] KVM: arm64: Fix handling of S1PTW S2 fault on RO memslots

[Marc Zyngier]

Recent developments on the EFI front have resulted in guests that
simply won't boot if the page tables are in a read-only memslot and
that you're a bit unlucky in the way S2 gets paged in... The core
issue is related to the fact that we treat a S1PTW as a write, which
is close enough to what needs to be done. Until to get to RO memslots.

The first patch fixes this and is definitely a stable candidate. It
splits the faulting of page tables in two steps (RO translation fault,
followed by a writable permission fault -- should it even happen).
The second one documents the slightly odd behaviour of PTW writes to
RO memslot, which do not result in a KVM_MMIO exit. The last patch is
totally optional, only tangentially related, and randomly repainting
stuff (maybe that's contagious, who knows).

The whole thing is on top of v6.1-rc2.

I plan to take this in as a fix shortly.

	M.

* From v1:

  - Added the documentation patch

  - Dropped the AF micro-optimisation, as it was creating more
    confusion, was hard to test, and was of dubious value

  - Collected RBs, with thanks

Marc Zyngier (3):
  KVM: arm64: Fix S1PTW handling on RO memslots
  KVM: arm64: Document the behaviour of S1PTW faults on RO memslots
  KVM: arm64: Convert FSC_* over to ESR_ELx_FSC_*

 Documentation/virt/kvm/api.rst          |  8 +++++
 arch/arm64/include/asm/esr.h            |  9 ++++++
 arch/arm64/include/asm/kvm_arm.h        | 15 ---------
 arch/arm64/include/asm/kvm_emulate.h    | 42 ++++++++++++++++++-------
 arch/arm64/kvm/hyp/include/hyp/fault.h  |  2 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h |  2 +-
 arch/arm64/kvm/mmu.c                    | 21 +++++++------
 7 files changed, 61 insertions(+), 38 deletions(-)

-- 
2.34.1