linux-kernel - [PATCH v2 12/22] powerpc/kvm/book3s: Add helper for host page table walk

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Date:   Thu, 19 Mar 2020 09:25:59 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     linuxppc-dev@...ts.ozlabs.org, mpe@...erman.id.au,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kvm-ppc@...r.kernel.org
Cc:     npiggin@...il.com, paulus@...abs.org, leonardo@...ux.ibm.com,
        kirill@...temov.name,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Subject: [PATCH v2 12/22] powerpc/kvm/book3s: Add helper for host page table walk

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
---
 arch/powerpc/include/asm/kvm_book3s_64.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 2860521992b6..1ca1f6495012 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/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);
 
-- 
2.24.1