KVM: arm64: Add kvm_pgtable_stage2_split()

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Add a new stage2 function, kvm_pgtable_stage2_split(), for splitting a
range of huge pages. This will be used for eager-splitting huge pages
into PAGE_SIZE pages. The goal is to avoid having to split huge pages
on write-protection faults, and instead use this function to do it
ahead of time for large ranges (e.g., all guest memory in 1G chunks at
a time).

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/20230426172330.1439644-7-ricarkol@google.com
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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Ricardo Koller 2023-04-26 17:23:24 +00:00 • committed by Oliver Upton

parent 2f440b72e8

commit 8f5a3eb751

2 changed files with 122 additions and 0 deletions

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19

arch/arm64/include/asm/kvm_pgtable.h

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103

arch/arm64/kvm/hyp/pgtable.c

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