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ANDROID: iommu/arm-smmu-v3-kvm: Fix idmap free_leaf

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As at the moment we don't support page table coalescing, it is possible
to call free_leaf while mapping a THP for a guest.
This should do nothing as the identity mapped page table doesn't
do any tracking of pages in the vmemmap.

Bug: 421734292
Change-Id: I436b9839643f8a4a76035bd2fa1e273d64456690
Signed-off-by: Mostafa Saleh <smostafa@google.com>
This commit is contained in:
Mostafa Saleh
2025-07-01 14:40:59 +00:00
parent c40c54e669
commit 5913c80b22
1 changed files with 6 additions and 0 deletions
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6
drivers/iommu/arm/arm-smmu-v3/pkvm/arm-smmu-v3.c
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@@ -928,6 +928,12 @@ static void smmu_tlb_add_page(struct iommu_iotlb_gather *gather,
static void smmu_free_leaf(unsigned long phys, size_t granule, void *cookie)
{
struct kvm_hyp_iommu_domain *domain = cookie;
/* No tracking for idmap domain. */
if (domain->domain_id == KVM_IOMMU_DOMAIN_IDMAP_ID)
return;
WARN_ON(iommu_pkvm_unuse_dma(phys, granule));
}