[PATCH v3 0/4] KVM: arm64: pKVM fixes

[Alexandru Elisei]

v2 can be found at [1].

Similar to [2], when trying to run an unprotected VM on FVP with S1PIE enabled
and kvm-arm.mode=protected, writes to PIRE0_EL1 made by the guest in
__cpu_setup() are trapped by KVM and the BUG_ON(!r->access) is hit. That's
because HFGWTR_EL2.nPIRE0_EL1 is an inverse polarity trap and the FGT values for
the unprotected pKVM VCPU weren't being propagated from kvm_arch_vcpu_load().

Couldn't figure out how to run a protected pKVM VM, so that's untested.

Changelog v2->v3:
* Gathered Reviewed-by tags, thanks!
* In patch #2, KVM now calls bad_trap() instead of KVM_BUG(). Also changed patch
  subject to match.

[1] https://lore.kernel.org/kvmarm/20251215114409.212512-1-alexandru.elisei@arm.com/
[2] https://lore.kernel.org/all/20251112102853.47759-1-alexandru.elisei@arm.com/

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()

 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/vhe/switch.c         | 2 +-
 arch/arm64/kvm/mmu.c                    | 4 ++--
 arch/arm64/kvm/sys_regs.c               | 5 ++++-
 7 files changed, 12 insertions(+), 7 deletions(-)


base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
-- 
2.52.0