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: Oliver Upton <oliver.upton@linux.dev> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20221107220006.1895572-1-oliver.upton@linux.dev
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@ -841,21 +841,12 @@ static int stage2_map_walk_table_pre(const struct kvm_pgtable_visit_ctx *ctx,
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if (!stage2_leaf_mapping_allowed(ctx, data))
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return 0;
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kvm_clear_pte(ctx->ptep);
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/*
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* Invalidate the whole stage-2, as we may have numerous leaf
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* entries below us which would otherwise need invalidating
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* individually.
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*/
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kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);
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ret = stage2_map_walker_try_leaf(ctx, data);
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if (ret)
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return ret;
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mm_ops->put_page(ctx->ptep);
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mm_ops->free_removed_table(childp, ctx->level);
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return ret;
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return 0;
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}
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static int stage2_map_walk_leaf(const struct kvm_pgtable_visit_ctx *ctx,
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