On Fri, 2016-01-15 at 15:06 +0800, Yongji Xie wrote:
> Current vfio-pci implementation disallows to mmap MSI-X
> table in case that user get to touch this directly.
>
> But we should allow to mmap these MSI-X tables if the PCI
> host bridge supports filtering of MSIs.
>
> Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx>
> ---
> drivers/vfio/pci/vfio_pci.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
> index 11fd0f0..4d68f6a 100644
> --- a/drivers/vfio/pci/vfio_pci.c
> +++ b/drivers/vfio/pci/vfio_pci.c
> @@ -555,7 +555,8 @@ static long vfio_pci_ioctl(void *device_data,
> IORESOURCE_MEM && !pci_resources_share_page(pdev,
> info.index)) {
> info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
> - if (info.index == vdev->msix_bar) {
> + if (!pci_host_bridge_msi_filtered_enabled(pdev) &&
> + info.index == vdev->msix_bar) {
> ret = msix_sparse_mmap_cap(vdev, &caps);
> if (ret)
> return ret;
> @@ -967,7 +968,8 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
> if (phys_len < PAGE_SIZE || req_start + req_len > phys_len)
> return -EINVAL;
>
> - if (index == vdev->msix_bar) {
> + if (!pci_host_bridge_msi_filtered_enabled(pdev) &&
> + index == vdev->msix_bar) {
> /*
> * Disallow mmaps overlapping the MSI-X table; users don't
> * get to touch this directly. We could find somewhere
What about read()/write() access, why would we allow mmap() but not
those?
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