[PATCH v2 0/3] KVM: arm64: Fixes for resolving the fault IPA

[Oliver Upton <oliver.upton@linux.dev>]

KVM's heuristics for determining the fault IPA are a bit shaky and don't
necessarily align with the letter of the architecture. On top of that,
HPFAR_EL2 is UNKNOWN if an SEA occurred during a table walk. Re-walking
the page tables will replay the SEA at EL2, becoming a panic in the hyp.

v1: https://lore.kernel.org/kvmarm/20250401224234.2906739-1-oliver.upton@linux.dev/

v1 -> v2 (addressed Marc's feedback):
 - Drop section reference in favor of the rule for HPFAR_EL2 validity
 - Fold test for Address size fault into helper, reuse existing
   definitions
 - Get rid of 'magic' shift for transforming FIPA field to an actual IPA
 - Add BUG_ON() to handle_host_mem_abort() if we fail to resolve the
   fault IPA.

Oliver Upton (3):
  KVM: arm64: Only read HPFAR_EL2 when value is architecturally valid
  arm64: Convert HPFAR_EL2 to sysreg table
  KVM: arm64: Don't translate FAR if invalid/unsafe

 arch/arm64/include/asm/esr.h           | 44 +++++++++++++++-
 arch/arm64/include/asm/kvm_emulate.h   |  7 ++-
 arch/arm64/include/asm/kvm_ras.h       |  2 +-
 arch/arm64/kvm/hyp/include/hyp/fault.h | 70 ++++++++++++++++++--------
 arch/arm64/kvm/hyp/nvhe/mem_protect.c  |  9 +++-
 arch/arm64/kvm/mmu.c                   | 31 +++++++-----
 arch/arm64/tools/sysreg                |  7 +++
 7 files changed, 131 insertions(+), 39 deletions(-)


base-commit: 369c0122682c4468a69f2454614eded71c5348f3
-- 
2.39.5