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authorPaolo Bonzini <pbonzini@redhat.com>2021-02-05 05:07:11 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2021-02-09 07:05:44 -0500
commit9fd6dad1261a541b3f5fa7dc5b152222306e6702 (patch)
tree07a393402e4e9d938a094731c816ca3b54da8711 /virt
parent897218ff7cf19290ec2d69652ce673d8ed6fedeb (diff)
mm: provide a saner PTE walking API for modules
Currently, the follow_pfn function is exported for modules but follow_pte is not. However, follow_pfn is very easy to misuse, because it does not provide protections (so most of its callers assume the page is writable!) and because it returns after having already unlocked the page table lock. Provide instead a simplified version of follow_pte that does not have the pmdpp and range arguments. The older version survives as follow_invalidate_pte() for use by fs/dax.c. Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 48ccdf4e3d04..ee4ac2618ec5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1911,7 +1911,7 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
spinlock_t *ptl;
int r;
- r = follow_pte(vma->vm_mm, addr, NULL, &ptep, NULL, &ptl);
+ r = follow_pte(vma->vm_mm, addr, &ptep, &ptl);
if (r) {
/*
* get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
@@ -1926,7 +1926,7 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
if (r)
return r;
- r = follow_pte(vma->vm_mm, addr, NULL, &ptep, NULL, &ptl);
+ r = follow_pte(vma->vm_mm, addr, &ptep, &ptl);
if (r)
return r;
}

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