The MSI-X structures of some devices and other non-MSI-X structures are in the same BAR. They may share one host page, especially in the case of large page granularity, suck as 64K.
For example, MSIX-Table size of 82599 NIC is 0x30 and the offset in Bar 3(size 64KB) is 0x0. If host page size is 64KB. vfio_listenerregion_add() will be called to map the remaining range (0x30-0xffff). And it will return early at 'int128_ge((int128_make64(iova), llend))' and hasn't any message. Let's add a trace point to informed users like 5c08600547c did. Signed-off-by: Kunkun Jiang <jiangkun...@huawei.com> --- hw/vfio/common.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 8728d4d5c2..2fc6213c0f 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -892,6 +892,13 @@ static void vfio_listener_region_add(MemoryListener *listener, llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask)); if (int128_ge(int128_make64(iova), llend)) { + if (memory_region_is_ram_device(section->mr)) { + trace_vfio_listener_region_add_no_dma_map( + memory_region_name(section->mr), + section->offset_within_address_space, + int128_getlo(section->size), + qemu_real_host_page_size); + } return; } end = int128_get64(int128_sub(llend, int128_one())); -- 2.23.0