1 files changed, 9 insertions, 0 deletions

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 4758d1bfcf41..4f41f309911e 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -303,6 +303,15 @@ enum {
         VFIO_PCI_BAR5_REGION_INDEX,
         VFIO_PCI_ROM_REGION_INDEX,
         VFIO_PCI_CONFIG_REGION_INDEX,
+        /*
+         * Expose VGA regions defined for PCI base class 03, subclass 00.
+         * This includes I/O port ranges 0x3b0 to 0x3bb and 0x3c0 to 0x3df
+         * as well as the MMIO range 0xa0000 to 0xbffff.  Each implemented
+         * range is found at it's identity mapped offset from the region
+         * offset, for example 0x3b0 is region_info.offset + 0x3b0.  Areas
+         * between described ranges are unimplemented.
+         */
+        VFIO_PCI_VGA_REGION_INDEX,
         VFIO_PCI_NUM_REGIONS
 };