KVM: arm64: Add helper for creating unlinked stage2 subtrees

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Add a stage2 helper, kvm_pgtable_stage2_create_unlinked(), for
creating unlinked tables (which is the opposite of
kvm_pgtable_stage2_free_unlinked()).  Creating an unlinked table is
useful for splitting level 1 and 2 entries into subtrees of PAGE_SIZE
PTEs.  For example, a level 1 entry can be split into PAGE_SIZE PTEs
by first creating a fully populated tree, and then use it to replace
the level 1 entry in a single step.  This will be used in a subsequent
commit for eager huge-page splitting (a dirty-logging optimization).

Signed-off-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Link: https://lore.kernel.org/r/20230426172330.1439644-4-ricarkol@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Ricardo Koller 2023-04-26 17:23:21 +00:00 • committed by Oliver Upton

parent 02f10845f4

commit e7c05540c6

2 changed files with 79 additions and 0 deletions

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26

arch/arm64/include/asm/kvm_pgtable.h

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53

arch/arm64/kvm/hyp/pgtable.c

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