Having a way to figure out the region index (or bar) associated with a memory region is helpful in various scenarios. For example, this capability can be useful in retrieving the region info needed for mapping a part of a VFIO region or creating a dmabuf.
Cc: Alex Williamson <[email protected]> Cc: Cédric Le Goater <[email protected]> Signed-off-by: Vivek Kasireddy <[email protected]> --- hw/vfio/region.c | 14 ++++++++++++++ include/hw/vfio/vfio-device.h | 2 ++ 2 files changed, 16 insertions(+) diff --git a/hw/vfio/region.c b/hw/vfio/region.c index b165ab0b93..8837afc97f 100644 --- a/hw/vfio/region.c +++ b/hw/vfio/region.c @@ -398,3 +398,17 @@ void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), enabled); } + +int vfio_get_region_index_from_mr(MemoryRegion *mr) +{ + VFIORegion *region = mr->opaque; + + if (mr->ops != &vfio_region_ops) { + mr = mr->container; + if (mr->ops != &vfio_region_ops) { + return -1; + } + region = mr->opaque; + } + return region->nr; +} diff --git a/include/hw/vfio/vfio-device.h b/include/hw/vfio/vfio-device.h index 7e9aed6d3c..bdb106c937 100644 --- a/include/hw/vfio/vfio-device.h +++ b/include/hw/vfio/vfio-device.h @@ -277,6 +277,8 @@ bool vfio_device_has_region_cap(VFIODevice *vbasedev, int region, uint16_t cap_t int vfio_device_get_irq_info(VFIODevice *vbasedev, int index, struct vfio_irq_info *info); + +int vfio_get_region_index_from_mr(MemoryRegion *mr); #endif /* Returns 0 on success, or a negative errno. */ -- 2.50.1
