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ANDROID: KVM: arm64: Don't update IOMMU under memory pressure

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host_stage2_unmap_unmoveable_regs() is called when the hypervisor pool
is under pressure to map stage-2 enteries, so it unmap all enteries that
can't be donated and owned by the host so it can be lazily faulted
later.
But that doesn't change any ownership of pages, so they are still owned
by the host and must remain mapped in the IOMMU.

Bug: 428939924
Change-Id: Id91183619a316a67bda48d8e9adf9b6ef49c104f
Signed-off-by: Mostafa Saleh <smostafa@google.com>
This commit is contained in:
Mostafa Saleh
2025-07-02 12:16:07 +00:00
parent f99b0f6dd2
commit 789dd354a8
1 changed files with 1 additions and 9 deletions
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10
arch/arm64/kvm/hyp/nvhe/mem_protect.c
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@@ -491,17 +491,9 @@ int __pkvm_prot_finalize(void)
int host_stage2_unmap_reg_locked(phys_addr_t start, u64 size)
{
int ret;
hyp_assert_lock_held(&host_mmu.lock);
ret = kvm_pgtable_stage2_reclaim_leaves(&host_mmu.pgt, start, size);
if (ret)
return ret;
kvm_iommu_host_stage2_idmap(start, start + size, 0);
return 0;
return kvm_pgtable_stage2_reclaim_leaves(&host_mmu.pgt, start, size);
}
static int host_stage2_unmap_unmoveable_regs(void)