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Subject[PATCH 13/14] KVM: arm64: Make table->block changes parallel-aware
Date
stage2_map_walk_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_walk_leaf() deal with it.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
arch/arm64/kvm/hyp/pgtable.c | 15 +++------------
1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index de1d352657d0..92e230e7bf3a 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -871,21 +871,12 @@ static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
if (!stage2_leaf_mapping_allowed(addr, end, level, data))
return 0;

- kvm_clear_pte(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_walk_leaf(addr, end, level, ptep, old, data);
+ if (ret)
+ return ret;

- mm_ops->put_page(ptep);
mm_ops->free_removed_table(childp, level + 1, pgt);
-
- return ret;
+ return 0;
}

static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
--
2.37.2.672.g94769d06f0-goog
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