Small set of fixes for the parallel faults series. Most importantly,
stop taking the RCU read lock for walking hyp stage-1. For the sake of
consistency, take a pointer to kvm_pgtable_walker in
kvm_dereference_pteref() as well.
Tested on an Ampere Altra system with kvm-arm.mode={nvhe,protected} and
lockdep. Applies on top of the parallel faults series picked up last
week.
v3: https://lore.kernel.org/kvmarm/20221116165655.2649475-1-oliver.upton@xxxxxxxxx/
v3 -> v4:
- Return an error instead of WARN() in hyp for shared walks (Will)
Oliver Upton (3):
KVM: arm64: Take a pointer to walker data in kvm_dereference_pteref()
KVM: arm64: Don't acquire RCU read lock for exclusive table walks
KVM: arm64: Reject shared table walks in the hyp code
arch/arm64/include/asm/kvm_pgtable.h | 159 +++++++++++++++------------
arch/arm64/kvm/hyp/pgtable.c | 13 ++-
2 files changed, 96 insertions(+), 76 deletions(-)
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2.38.1.584.g0f3c55d4c2-goog
