On 2016/1/29 6:46, Alex Williamson wrote:
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?
Yes, you are right! I miss the MSI-X table check in vfio_pci_bar_rw().
I will fix it in next version. Thanks.
Regards,
Yongji Xie
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