KVM/arm64 fixes for 6.19

[Oliver Upton <oupton@kernel.org>]

Hi Paolo,

Here is the first (and likely only) set of fixes for 6.19. Small batch
of changes fixing issues in non-standard configurations like pKVM, hVHE,
and nested.

Details are in the tag, please pull.

Thanks,
Oliver

The following changes since commit f8f9c1f4d0c7a64600e2ca312dec824a0bc2f1da:

  Linux 6.19-rc3 (2025-12-28 13:24:26 -0800)

are available in the Git repository at:

  https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git/ tags/kvmarm-fixes-6.19-1

for you to fetch changes up to 19cffd16ed6489770272ba383ff3aaec077e01ed:

  KVM: arm64: Invert KVM_PGTABLE_WALK_HANDLE_FAULT to fix pKVM walkers (2026-01-10 02:19:52 -0800)

----------------------------------------------------------------
KVM/arm64 fixes for 6.19

 - Ensure early return semantics are preserved for pKVM fault handlers

 - Fix case where the kernel runs with the guest's PAN value when
   CONFIG_ARM64_PAN is not set

 - Make stage-1 walks to set the access flag respect the access
   permission of the underlying stage-2, when enabled

 - Propagate computed FGT values to the pKVM view of the vCPU at
   vcpu_load()

 - Correctly program PXN and UXN privilege bits for hVHE's stage-1 page
   tables

 - Check that the VM is actually using VGICv3 before accessing the GICv3
   CPU interface

 - Delete some unused code

----------------------------------------------------------------
Alexandru Elisei (4):
      KVM: arm64: Copy FGT traps to unprotected pKVM VCPU on VCPU load
      KVM: arm64: Inject UNDEF for a register trap without accessor
      KVM: arm64: Remove extra argument for __pvkm_host_{share,unshare}_hyp()
      KVM: arm64: Remove unused parameter in synchronize_vcpu_pstate()

Dongxu Sun (1):
      KVM: arm64: Remove unused vcpu_{clear,set}_wfx_traps()

Marc Zyngier (2):
      KVM: arm64: Fix EL2 S1 XN handling for hVHE setups
      KVM: arm64: Don't blindly set set PSTATE.PAN on guest exit

Oliver Upton (1):
      KVM: arm64: nv: Respect stage-2 write permssion when setting stage-1 AF

Sascha Bischoff (1):
      KVM: arm64: gic: Check for vGICv3 when clearing TWI

Will Deacon (1):
      KVM: arm64: Invert KVM_PGTABLE_WALK_HANDLE_FAULT to fix pKVM walkers

 arch/arm64/include/asm/kvm_asm.h        |  2 ++
 arch/arm64/include/asm/kvm_emulate.h    | 16 ----------------
 arch/arm64/include/asm/kvm_pgtable.h    | 16 ++++++++++++----
 arch/arm64/include/asm/sysreg.h         |  3 ++-
 arch/arm64/kernel/image-vars.h          |  1 +
 arch/arm64/kvm/arm.c                    |  1 +
 arch/arm64/kvm/at.c                     |  8 ++++++--
 arch/arm64/kvm/hyp/entry.S              |  4 +++-
 arch/arm64/kvm/hyp/include/hyp/switch.h |  2 +-
 arch/arm64/kvm/hyp/nvhe/hyp-main.c      |  3 +++
 arch/arm64/kvm/hyp/nvhe/pkvm.c          |  1 -
 arch/arm64/kvm/hyp/nvhe/switch.c        |  2 +-
 arch/arm64/kvm/hyp/pgtable.c            |  5 +++--
 arch/arm64/kvm/hyp/vhe/switch.c         |  2 +-
 arch/arm64/kvm/mmu.c                    | 12 +++++-------
 arch/arm64/kvm/sys_regs.c               |  5 ++++-
 arch/arm64/kvm/va_layout.c              | 28 ++++++++++++++++++++++++++++
 17 files changed, 73 insertions(+), 38 deletions(-)