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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>
This commit is contained in:
Alex Williamson 2012-10-10 09:10:31 -06:00
parent 2474542f64
commit 34002f54d2
1 changed files with 3 additions and 4 deletions
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7
drivers/vfio/pci/vfio_pci.c
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@ -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 vfio_pci_device *vdev = device_data;
struct pci_dev *pdev = vdev->pdev; struct pci_dev *pdev = vdev->pdev;
unsigned int index; unsigned int index;
u64 phys_len, req_len, pgoff, req_start, phys; u64 phys_len, req_len, pgoff, req_start;
int ret; int ret;
index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT); 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_private_data = vdev;
vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP; vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 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, vma->vm_pgoff,
return remap_pfn_range(vma, vma->vm_start, phys,
req_len, vma->vm_page_prot); req_len, vma->vm_page_prot);
} }