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authorYan Zhao <yan.y.zhao@intel.com>2020-09-16 05:28:33 +0300
committerAlex Williamson <alex.williamson@redhat.com>2020-09-21 23:50:51 +0300
commit7ef32e52368f62a4e041a4f0abefb4fb64e7fd4a (patch)
tree8702ce03061238f7d5cb2ce95eed525d56fac02b /drivers/vfio
parentba4f184e126b751d1bffad5897f263108befc780 (diff)
downloadlinux-7ef32e52368f62a4e041a4f0abefb4fb64e7fd4a.tar.xz
vfio: add a singleton check for vfio_group_pin_pages
Page pinning is used both to translate and pin device mappings for DMA purpose, as well as to indicate to the IOMMU backend to limit the dirty page scope to those pages that have been pinned, in the case of an IOMMU backed device. To support this, the vfio_pin_pages() interface limits itself to only singleton groups such that the IOMMU backend can consider dirty page scope only at the group level. Implement the same requirement for the vfio_group_pin_pages() interface. Fixes: 95fc87b44104 ("vfio: Selective dirty page tracking if IOMMU backed device pins pages") Signed-off-by: Yan Zhao <yan.y.zhao@intel.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/vfio.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 262ab0efd06c..532bcaf28c11 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -2051,6 +2051,9 @@ int vfio_group_pin_pages(struct vfio_group *group,
if (!group || !user_iova_pfn || !phys_pfn || !npage)
return -EINVAL;
+ if (group->dev_counter > 1)
+ return -EINVAL;
+
if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
return -E2BIG;