Commit af87fc03 authored by Oliver Upton's avatar Oliver Upton Committed by Marc Zyngier
Browse files

KVM: arm64: Make table->block changes parallel-aware 



stage2_map_walker_try_leaf() and friends now handle stage-2 PTEs
generically, and perform the correct flush when a table PTE is removed.
Additionally, they've been made parallel-aware, using an atomic break
to take ownership of the PTE.

Stop clearing the PTE in the pre-order callback and instead let
stage2_map_walker_try_leaf() deal with it.

Signed-off-by: default avatarOliver Upton <oliver.upton@linux.dev>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221107220006.1895572-1-oliver.upton@linux.dev
parent 946fbfdf

arch/arm64/kvm/hyp/pgtable.c

+3 −12
Original line number Diff line number Diff line
@@ -841,21 +841,12 @@ static int stage2_map_walk_table_pre(const struct kvm_pgtable_visit_ctx *ctx, 
	if (!stage2_leaf_mapping_allowed(ctx, data))

		return 0;



	kvm_clear_pte(ctx->ptep);



	/*

	 * Invalidate the whole stage-2, as we may have numerous leaf

	 * entries below us which would otherwise need invalidating

	 * individually.

	 */

	kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);



	ret = stage2_map_walker_try_leaf(ctx, data);

	if (ret)

		return ret;



	mm_ops->put_page(ctx->ptep);

	mm_ops->free_removed_table(childp, ctx->level);



	return ret;

	return 0;

}



static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,