[PATCH v2 3/5] mm: userfaultfd: allow to register continue for guest_memfd

[Nikita Kalyazin]

Signed-off-by: Nikita Kalyazin <kalya...@amazon.com>
---
 include/linux/userfaultfd_k.h | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h
index 75342022d144..bc184edfbb85 100644
--- a/include/linux/userfaultfd_k.h
+++ b/include/linux/userfaultfd_k.h
@@ -212,6 +212,10 @@ static inline bool userfaultfd_armed(struct vm_area_struct 
*vma)
        return vma->vm_flags & __VM_UFFD_FLAGS;
 }
 
+#ifdef CONFIG_KVM_PRIVATE_MEM
+bool kvm_gmem_vma_is_gmem(struct vm_area_struct *vma);
+#endif
+
 static inline bool vma_can_userfault(struct vm_area_struct *vma,
                                     unsigned long vm_flags,
                                     bool wp_async)
@@ -222,7 +226,11 @@ static inline bool vma_can_userfault(struct vm_area_struct 
*vma,
                return false;
 
        if ((vm_flags & VM_UFFD_MINOR) &&
-           (!is_vm_hugetlb_page(vma) && !vma_is_shmem(vma)))
+           (!is_vm_hugetlb_page(vma) && !vma_is_shmem(vma))
+#ifdef CONFIG_KVM_PRIVATE_MEM
+            && !kvm_gmem_vma_is_gmem(vma)
+#endif
+           )
                return false;
 
        /*
@@ -244,6 +252,9 @@ static inline bool vma_can_userfault(struct vm_area_struct 
*vma,
 
        /* By default, allow any of anon|shmem|hugetlb */
        return vma_is_anonymous(vma) || is_vm_hugetlb_page(vma) ||
+#ifdef CONFIG_KVM_PRIVATE_MEM
+           kvm_gmem_vma_is_gmem(vma) ||
+#endif
            vma_is_shmem(vma);
 }
 
-- 
2.47.1