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

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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
This commit is contained in:
Oliver Upton 2022-11-07 22:00:06 +00:00 committed by Marc Zyngier
parent 946fbfdf33
commit af87fc03cf
1 changed files with 3 additions and 12 deletions
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15
arch/arm64/kvm/hyp/pgtable.c
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@ -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,