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| author | Oliver Upton <oliver.upton@linux.dev> | 2022-11-07 21:56:35 +0000 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-10 14:43:46 +0000 |
| commit | 8e94e1252cc054bb31fd3e9a15235cd831970ec1 (patch) | |
| tree | 6c014757ce57ce0ff55786d83d8820388d15be4f /arch/arm64/include/asm/kvm_pgtable.h | |
| parent | fa002e8e79b3f980455ba585c1f47b26680de5b9 (diff) | |
| download | lwn-8e94e1252cc054bb31fd3e9a15235cd831970ec1.tar.gz lwn-8e94e1252cc054bb31fd3e9a15235cd831970ec1.zip | |
KVM: arm64: Add a helper to tear down unlinked stage-2 subtrees
A subsequent change to KVM will move the tear down of an unlinked
stage-2 subtree out of the critical path of the break-before-make
sequence.
Introduce a new helper for tearing down unlinked stage-2 subtrees.
Leverage the existing stage-2 free walkers to do so, with a deep call
into __kvm_pgtable_walk() as the subtree is no longer reachable from the
root.
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221107215644.1895162-6-oliver.upton@linux.dev
Diffstat (limited to 'arch/arm64/include/asm/kvm_pgtable.h')
| -rw-r--r-- | arch/arm64/include/asm/kvm_pgtable.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h index a752793482cb..93b1feeaebab 100644 --- a/arch/arm64/include/asm/kvm_pgtable.h +++ b/arch/arm64/include/asm/kvm_pgtable.h @@ -334,6 +334,17 @@ int __kvm_pgtable_stage2_init(struct kvm_pgtable *pgt, struct kvm_s2_mmu *mmu, void kvm_pgtable_stage2_destroy(struct kvm_pgtable *pgt); /** + * kvm_pgtable_stage2_free_removed() - Free a removed stage-2 paging structure. + * @mm_ops: Memory management callbacks. + * @pgtable: Unlinked stage-2 paging structure to be freed. + * @level: Level of the stage-2 paging structure to be freed. + * + * The page-table is assumed to be unreachable by any hardware walkers prior to + * freeing and therefore no TLB invalidation is performed. + */ +void kvm_pgtable_stage2_free_removed(struct kvm_pgtable_mm_ops *mm_ops, void *pgtable, u32 level); + +/** * kvm_pgtable_stage2_map() - Install a mapping in a guest stage-2 page-table. * @pgt: Page-table structure initialised by kvm_pgtable_stage2_init*(). * @addr: Intermediate physical address at which to place the mapping. |