When I implemented the parallel faults series I was mostly focused on improving the performance of 8.1+ implementations which bring us FEAT_HAFDBS. In so doing, I failed to put access faults on the read side of the MMU lock. Anyhow, this small series adds support for handling access faults in parallel, piling on top of the infrastructure from the first parallel faults series. As most large systems I'm aware of are 8.1+ anyway, I don't expect this series to provide significant uplift beyond some oddball machines Marc has lying around. Don't get me wrong, I'd love to have a D05 to play with too... Patches 1-3 are the significant portion of the series, and patch 4 was used to test on an Ampere Altra system by guarding VTCR_EL2.HA with the kernel's Kconfig option for FEAT_HAFDBS. I've included it as I find it helpful for testing on newer hardware. Having said that, I won't throw a fit if it gets dropped either. Applies to kvmarm/next due to the dependency on the larger parallel faults series. Tested on Ampere Altra w/ VTCR_EL2.HA=0 as well as a Raspberry Pi 4. Oliver Upton (4): KVM: arm64: Use KVM's pte type/helpers in handle_access_fault() KVM: arm64: Don't serialize if the access flag isn't set KVM: arm64: Handle access faults behind the read lock KVM: arm64: Condition HW AF updates on config option arch/arm64/include/asm/kvm_pgtable.h | 5 +++++ arch/arm64/kvm/hyp/pgtable.c | 12 +++++++++--- arch/arm64/kvm/mmu.c | 14 ++++++-------- 3 files changed, 20 insertions(+), 11 deletions(-) base-commit: 456ce3545dd06700df7fe82173a06b369288bcef -- 2.38.1.584.g0f3c55d4c2-goog
