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FROMLIST: KVM: arm64: Refcount hyp stage-1 pgtable pages

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To prepare the ground for allowing hyp stage-1 mappings to be removed at
run-time, update the KVM page-table code to maintain a correct refcount
using the ->{get,put}_page() function callbacks.

Signed-off-by: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20211201170411.1561936-4-qperret@google.com
Bug: 209599700
Change-Id: If45f4a5c62e70db5c6ee60192fff5ca4b945aa31
This commit is contained in:
Quentin Perret
2021-12-01 17:03:57 +00:00
parent 2183d4b524
commit b91c0e5d96
1 changed files with 14 additions and 3 deletions
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17
arch/arm64/kvm/hyp/pgtable.c
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@@ -408,8 +408,10 @@ static bool hyp_map_walker_try_leaf(u64 addr, u64 end, u32 level,
return false;
new = kvm_init_valid_leaf_pte(phys, data->attr, level);
if (hyp_pte_needs_update(old, new))
if (hyp_pte_needs_update(old, new)) {
smp_store_release(ptep, new);
data->mm_ops->get_page(ptep);
}
data->phys += granule;
return true;
@@ -433,6 +435,7 @@ static int hyp_map_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
return -ENOMEM;
kvm_set_table_pte(ptep, childp, mm_ops);
mm_ops->get_page(ptep);
return 0;
}
@@ -482,8 +485,16 @@ static int hyp_free_walker(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
enum kvm_pgtable_walk_flags flag, void * const arg)
{
struct kvm_pgtable_mm_ops *mm_ops = arg;
kvm_pte_t pte = *ptep;
if (!kvm_pte_valid(pte))
return 0;
mm_ops->put_page(ptep);
if (kvm_pte_table(pte, level))
mm_ops->put_page(kvm_pte_follow(pte, mm_ops));
mm_ops->put_page((void *)kvm_pte_follow(*ptep, mm_ops));
return 0;
}
@@ -491,7 +502,7 @@ void kvm_pgtable_hyp_destroy(struct kvm_pgtable *pgt)
{
struct kvm_pgtable_walker walker = {
.cb = hyp_free_walker,
.flags = KVM_PGTABLE_WALK_TABLE_POST,
.flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
.arg = pgt->mm_ops,
};