vfio: Fix PCI mmap after b3b9c293

Our mmap path mistakely relied on vma->vm_pgoff to get set in
remap_pfn_range.  After b3b9c293, that path only applies to
copy-on-write mappings.  Set it in our own code.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 6d369fe..6c11994 100644 (file)
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -408,7 +408,7 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
        struct vfio_pci_device *vdev = device_data;
        struct pci_dev *pdev = vdev->pdev;
        unsigned int index;
-       u64 phys_len, req_len, pgoff, req_start, phys;
+       u64 phys_len, req_len, pgoff, req_start;
        int ret;
 
        index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
@@ -463,10 +463,9 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
        vma->vm_private_data = vdev;
        vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+       vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
 
-       phys = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
-
-       return remap_pfn_range(vma, vma->vm_start, phys,
+       return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
                               req_len, vma->vm_page_prot);
 }