Having a way to get the VFIO region associated with a memory region is helpful in various scenarios. For example, this capability can be useful in retrieving the region info such as index and offset 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/vfio-region.h | 10 ++++++++++ hw/vfio/region.c | 11 +++++++++++ 2 files changed, 21 insertions(+) diff --git a/hw/vfio/vfio-region.h b/hw/vfio/vfio-region.h index 58b236f113..004be67269 100644 --- a/hw/vfio/vfio-region.h +++ b/hw/vfio/vfio-region.h @@ -44,4 +44,14 @@ void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled); void vfio_region_exit(VFIORegion *region); void vfio_region_finalize(VFIORegion *region); +/** + * Return the VFIO region associated with a given MemoryRegion. This can + * be useful in retrieving region info such as index and offset. + * + * @mr: MemoryRegion to use + * + * Returns the region or NULL on error. + */ +VFIORegion *vfio_get_region_from_mr(MemoryRegion *mr); + #endif /* HW_VFIO_REGION_H */ diff --git a/hw/vfio/region.c b/hw/vfio/region.c index 54ad11a6c8..37678aeb2d 100644 --- a/hw/vfio/region.c +++ b/hw/vfio/region.c @@ -528,3 +528,14 @@ void vfio_region_mmaps_set_enabled(VFIORegion *region, bool enabled) trace_vfio_region_mmaps_set_enabled(memory_region_name(region->mem), enabled); } + +VFIORegion *vfio_get_region_from_mr(MemoryRegion *mr) +{ + while (mr->container) { + if (mr->ops == &vfio_region_ops) { + return mr->opaque; + } + mr = mr->container; + } + return NULL; +} -- 2.53.0
