[PATCH v17 Kernel 6/7] vfio iommu: Adds flag to indicate dirty pages tracking capability support

Kirti Wankhede
2020-03-30T17:24:55Z

Flag VFIO_IOMMU_INFO_DIRTY_PGS in VFIO_IOMMU_GET_INFO indicates that driver
support dirty pages tracking.

Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Reviewed-by: Neo Jia <cjia@nvidia.com>
---
drivers/vfio/vfio_iommu_type1.c | 3 ++-
include/uapi/linux/vfio.h | 5 +++--
2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 266550bd7307..9fe12b425976 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -2390,7 +2390,8 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
info.cap_offset = 0; /* output, no-recopy necessary */
}

- info.flags = VFIO_IOMMU_INFO_PGSIZES;
+ info.flags = VFIO_IOMMU_INFO_PGSIZES |
+ VFIO_IOMMU_INFO_DIRTY_PGS;

info.iova_pgsizes = vfio_pgsize_bitmap(iommu);

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index e3cbf8b78623..0fe7c9a6f211 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -985,8 +985,9 @@ struct vfio_device_feature {
struct vfio_iommu_type1_info {
__u32 argsz;
__u32 flags;
-#define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */
-#define VFIO_IOMMU_INFO_CAPS (1 << 1) /* Info supports caps */
+#define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */
+#define VFIO_IOMMU_INFO_CAPS (1 << 1) /* Info supports caps */
+#define VFIO_IOMMU_INFO_DIRTY_PGS (1 << 2) /* supports dirty page tracking */
__u64 iova_pgsizes; /* Bitmap of supported page sizes */
__u32 cap_offset; /* Offset within info struct of first cap */
};
--
2.7.0