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ANDROID: KVM: arm64: Initialize pkvm_pgtable.mm_ops earlier

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The `init` callback of an IOMMU driver is called just before
`finalize_host_mappings` so that EL2 mappings created by drivers are
subsequently unmapped from host stage-2. However, at this point hyp has
already switched to the buddy allocator, having reserved pages allocated
by the early allocator, but `pkvm_pgtable.mm_ops` have not been switched
to buddy allocator callbacks. As a result, pages allocated for EL2
mappings of the IOMMU driver are allocated by the obsoleted early
allocator and remain treated as free by the buddy allocator. This likely
leads to a corruption in the free page lists and a later hyp panic.

Move the initialization of `pkvm_pgtable.mm_ops` before
`finalize_host_mappings` and the call to IOMMU's `init`.

Test: run a VM
Test: adb shell cmd jobscheduler run -f android 5132250
Bug: 190463801
Bug: 209004831
Signed-off-by: David Brazdil <dbrazdil@google.com>
Change-Id: I42ad28e6b4cfb014d50dbbf722e4c02d5f684178
This commit is contained in:
David Brazdil
2021-12-06 11:03:06 +00:00
parent 8d929114a7
commit e3bc721865
1 changed files with 6 additions and 6 deletions
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12
arch/arm64/kvm/hyp/nvhe/setup.c
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@@ -268,12 +268,6 @@ void __noreturn __pkvm_init_finalise(void)
if (ret)
goto out;
if (kvm_iommu_ops.init) {
ret = kvm_iommu_ops.init();
if (ret)
goto out;
}
pkvm_pgtable_mm_ops = (struct kvm_pgtable_mm_ops) {
.zalloc_page = hyp_zalloc_hyp_page,
.phys_to_virt = hyp_phys_to_virt,
@@ -284,6 +278,12 @@ void __noreturn __pkvm_init_finalise(void)
};
pkvm_pgtable.mm_ops = &pkvm_pgtable_mm_ops;
if (kvm_iommu_ops.init) {
ret = kvm_iommu_ops.init();
if (ret)
goto out;
}
ret = finalize_host_mappings();
if (ret)
goto out;