This series is an update to the PUD hugepage support previously posted at [0]. This patchset adds support for PUD hugepages at stage 2. This feature is useful on cores that have support for large sized TLB mappings (e.g., 1GB for 4K granule).
The biggest change in this version is to replace repeated instances of walking the page tables to get to a leaf-entry with a function to return the appropriate entry. This was suggested by Suzuki and should help reduce the amount of churn resulting from future changes. It also address other feedback on the previous version. Support is added to code that is shared between arm and arm64. Dummy helpers for arm are provided as the port does not support PUD hugepage sizes. The patches have been tested on an A57 based system. The patchset is based on v4.18-rc4. The are a few conflicts with the support for 52 bit IPA[1] due to change in number of parameters for stage2_pmd_offset(). Thanks, Punit v4 -> v5: * Patch 1 - Drop helper stage2_should_exec() and refactor the condition to decide if a page table entry should be marked executable * Patch 4-6 - Introduce stage2_get_leaf_entry() and use it in this and latter patches * Patch 7 - Use stage 2 accessors instead of using the page table helpers directly * Patch 7 - Add a note to update the PUD hugepage support when number of levels of stage 2 tables differs from stage 1 v3 -> v4: * Patch 1 and 7 - Don't put down hugepages pte if logging is enabled * Patch 4-5 - Add PUD hugepage support for exec and access faults * Patch 6 - PUD hugepage support for aging page table entries v2 -> v3: * Update vma_pagesize directly if THP [1/4]. Previsouly this was done indirectly via hugetlb * Added review tag [4/4] v1 -> v2: * Create helper to check if the page should have exec permission [1/4] * Fix broken condition to detect THP hugepage [1/4] * Fix in-correct hunk resulting from a rebase [4/4] [0] https://www.spinics.net/lists/arm-kernel/msg663562.html [1] https://www.spinics.net/lists/kvm/msg171065.html Punit Agrawal (7): KVM: arm/arm64: Share common code in user_mem_abort() KVM: arm/arm64: Introduce helpers to manupulate page table entries KVM: arm64: Support dirty page tracking for PUD hugepages KVM: arm64: Support PUD hugepage in stage2_is_exec() KVM: arm64: Support handling access faults for PUD hugepages KVM: arm64: Update age handlers to support PUD hugepages KVM: arm64: Add support for creating PUD hugepages at stage 2 arch/arm/include/asm/kvm_mmu.h | 60 +++++ arch/arm64/include/asm/kvm_mmu.h | 47 ++++ arch/arm64/include/asm/pgtable-hwdef.h | 4 + arch/arm64/include/asm/pgtable.h | 9 + virt/kvm/arm/mmu.c | 289 ++++++++++++++++++------- 5 files changed, 330 insertions(+), 79 deletions(-) -- 2.17.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
