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-rw-r--r--virt/kvm/kvm_main.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8367d88ce39b..335a1a2b8edc 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1904,9 +1904,11 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
kvm_pfn_t *p_pfn)
{
unsigned long pfn;
+ pte_t *ptep;
+ spinlock_t *ptl;
int r;
- r = follow_pfn(vma, addr, &pfn);
+ r = follow_pte(vma->vm_mm, addr, NULL, &ptep, NULL, &ptl);
if (r) {
/*
* get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
@@ -1921,14 +1923,19 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
if (r)
return r;
- r = follow_pfn(vma, addr, &pfn);
+ r = follow_pte(vma->vm_mm, addr, NULL, &ptep, NULL, &ptl);
if (r)
return r;
+ }
+ if (write_fault && !pte_write(*ptep)) {
+ pfn = KVM_PFN_ERR_RO_FAULT;
+ goto out;
}
if (writable)
- *writable = true;
+ *writable = pte_write(*ptep);
+ pfn = pte_pfn(*ptep);
/*
* Get a reference here because callers of *hva_to_pfn* and
@@ -1943,6 +1950,8 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
*/
kvm_get_pfn(pfn);
+out:
+ pte_unmap_unlock(ptep, ptl);
*p_pfn = pfn;
return 0;
}