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ANDROID: KVM: arm64: Invalidate TLB by VMID when tearing down the shadow VM

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When a shadow VM is torn down, its VMID can be reallocated as soon as
the shadow table entry is cleared to NULL. Since tearing down the
stage-2 page-table does not imply TLB invalidation, the TLB could still
contain stale entries from the old VM and the new user of the VMID could
end up seeing erroneous translations.

Invalidate the TLB for the VMID of the VM being torn down prior to
clearing its entry in the shadow table.

Bug: 226312378
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Ice44d030bf01a1b7612413ee32440f3f38cb3e4e
This commit is contained in:
Will Deacon
2022-03-23 09:27:26 +00:00
parent ed0dec098e
commit 93846ccca1
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/kvm/hyp/nvhe/pkvm.c
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@@ -678,6 +678,8 @@ int __pkvm_teardown_shadow(int shadow_handle)
goto err_unlock;
}
/* Ensure the VMID is clean before it can be reallocated */
__kvm_tlb_flush_vmid(&vm->arch.mmu);
remove_shadow_table(shadow_handle);
hyp_spin_unlock(&shadow_lock);