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Subject[PATCH v8 0/9] KVM: Support PUD hugepage at stage 2
This series is an update to the PUD hugepage support previously posted
at [0]. This patchset adds support for PUD hugepages at stage 2 a
feature that is useful on cores that have support for large sized TLB
mappings (e.g., 1GB for 4K granule).

The only change in this version is to update the kvm_stage2_has_pud()
helper for arm to use CONFIG_PGTABLE_LEVELS.

The patches are based on v6 of the dynamic IPA support.

The patches have been tested on AMD Seattle system with the following
hugepage sizes - 64K, 32M, 1G.


v7 -> v8

* Add kvm_stage2_has_pud() helper on arm32
* Rebased to v6 of 52bit dynamic IPA support

v6 -> v7

* Restrict thp check to exclude hugetlbfs pages - Patch 1
* Don't update PUD entry if there's no change - Patch 9
* Add check for PUD level in stage 2 - Patch 9

v5 -> v6

* Split Patch 1 to move out the refactoring of exec permissions on
page table entries.
* Patch 4 - Initialise p*dpp pointers in stage2_get_leaf_entry()
* Patch 5 - Trigger a BUG() in kvm_pud_pfn() on arm

v4 -> v5:
* Patch 1 - Drop helper stage2_should_exec() and refactor the
condition to decide if a page table entry should be marked
* 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]


Punit Agrawal (9):
KVM: arm/arm64: Ensure only THP is candidate for adjustment
KVM: arm/arm64: Share common code in user_mem_abort()
KVM: arm/arm64: Re-factor setting the Stage 2 entry to exec on fault
KVM: arm/arm64: Introduce helpers to manipulate 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 | 61 +++++
arch/arm/include/asm/stage2_pgtable.h | 9 +
arch/arm64/include/asm/kvm_mmu.h | 48 ++++
arch/arm64/include/asm/pgtable-hwdef.h | 4 +
arch/arm64/include/asm/pgtable.h | 9 +
virt/kvm/arm/mmu.c | 320 +++++++++++++++++++------
6 files changed, 373 insertions(+), 78 deletions(-)


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