vfio: add a singleton check for vfio_group_pin_pages

[ Upstream commit 7ef32e52368f62a4e041a4f0abefb4fb64e7fd4a ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 580099afeaffad38fc40105301af22af27ad1921..2a70e25cfe954428b3b8b9e62c05ad65b943230d 100644 (file)
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -2050,6 +2050,9 @@ 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;