[RFC PATCH v3 5/5] vfio-pci: Allow to mmap MSI-X table if host bridge supports filtering of MSIs
From: Yongji Xie <hidden>
Date: 2016-01-15 07:09:42
Also in:
kvm, linuxppc-dev, lkml
Subsystem:
the rest, vfio driver · Maintainers:
Linus Torvalds, Alex Williamson
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 <redacted> --- 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
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1.7.9.5