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authorAlex Williamson <alex.williamson@redhat.com>2012-10-10 09:10:31 -0600
committerAlex Williamson <alex.williamson@redhat.com>2012-10-10 09:10:31 -0600
commit34002f54d2bd8e8ac04f0da0847f71a8a06a5d38 (patch)
tree97f205940afdc9d6e684f213aad522cb5a1f0916 /drivers/vfio
parent2474542f64432398f503373f53bdf620491bcfa8 (diff)
downloadlinux-34002f54d2bd8e8ac04f0da0847f71a8a06a5d38.tar.gz
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>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/pci/vfio_pci.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 6d369fe9d30..6c119944bbb 100644
--- 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);
}