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 IOMMU
supports interrupt remapping which can ensure that a
given pci device can only shoot the MSIs assigned for it.
Signed-off-by: Yongji Xie <xyjxie@xxxxxxxxxxxxxxxxxx>
---
drivers/vfio/pci/vfio_pci.c | 8 +++++---
drivers/vfio/pci/vfio_pci_rdwr.c | 4 +++-
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 49d7a69..d6f4788 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -592,13 +592,14 @@ 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 (!iommu_capable(pdev->dev.bus,
+ IOMMU_CAP_INTR_REMAP) &&
+ info.index == vdev->msix_bar) {
ret = msix_sparse_mmap_cap(vdev, &caps);
if (ret)
return ret;
}
}
-
break;
case VFIO_PCI_ROM_REGION_INDEX:
{
@@ -1029,7 +1030,8 @@ 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 (!iommu_capable(pdev->dev.bus, IOMMU_CAP_INTR_REMAP) &&
+ index == vdev->msix_bar) {
/*
* Disallow mmaps overlapping the MSI-X table; users don't
* get to touch this directly. We could find somewhere
diff --git a/drivers/vfio/pci/vfio_pci_rdwr.c b/drivers/vfio/pci/vfio_pci_rdwr.c
index 5ffd1d9..1c46c29 100644
--- a/drivers/vfio/pci/vfio_pci_rdwr.c
+++ b/drivers/vfio/pci/vfio_pci_rdwr.c
@@ -18,6 +18,7 @@
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/vgaarb.h>
+#include <linux/iommu.h>
#include "vfio_pci_private.h"
@@ -164,7 +165,8 @@ ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
} else
io = vdev->barmap[bar];
- if (bar == vdev->msix_bar) {
+ if (!iommu_capable(pdev->dev.bus, IOMMU_CAP_INTR_REMAP) &&
+ bar == vdev->msix_bar) {
x_start = vdev->msix_offset;
x_end = vdev->msix_offset + vdev->msix_size;
}
--
1.7.9.5
--
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