powerpc/kvm/book3s: Add helper for host page table walk

Signed-off-by: Aneesh Kumar K.V <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: kvaneesh

arch/powerpc/include/asm/kvm_book3s_64.h

@@ -647,6 +647,22 @@ static inline pte_t *find_kvm_secondary_pte(struct kvm *kvm, unsigned long ea,
 	return pte;
 }
 
+static inline pte_t *find_kvm_host_pte(struct kvm *kvm, unsigned long mmu_seq,
+				       unsigned long ea, unsigned *hshift)
+{
+	pte_t *pte;
+
+	VM_WARN(!spin_is_locked(&kvm->mmu_lock),
+		"%s called with kvm mmu_lock not held \n", __func__);
+
+	if (mmu_notifier_retry(kvm, mmu_seq))
+		return NULL;
+
+	pte = __find_linux_pte(kvm->mm->pgd, ea, NULL, hshift);
+
+	return pte;
+}
+
 extern pte_t *find_kvm_nested_guest_pte(struct kvm *kvm, unsigned long lpid,
 					unsigned long ea, unsigned *hshift);