We don't want /sys/firmware/memmap entries and we want to indicate our memory as "System RAM (driver managed)" in /proc/iomem. This is especially relevant for kexec-tools, which have to be updated to support dumping virtio-mem memory after this patch. Expected behavior in kexec-tools: - Don't use this memory when creating a fixed-up firmware memmap. Works now out of the box on x86-64. - Don't use this memory for placing kexec segments. Works now out of the box on x86-64. - Consider "System RAM (driver managed)" when creating the elfcorehdr for kdump. This memory has to be dumped. Needs update of kexec-tools. With this patch on x86-64: /proc/iomem: 00000000-00000fff : Reserved 00001000-0009fbff : System RAM [...] fffc0000-ffffffff : Reserved 100000000-13fffffff : System RAM 140000000-147ffffff : System RAM (driver managed) 340000000-347ffffff : System RAM (driver managed) 348000000-34fffffff : System RAM (driver managed) [..] 3280000000-32ffffffff : PCI Bus 0000:00 /sys/firmware/memmap: 0000000000000000-000000000009fc00 (System RAM) 000000000009fc00-00000000000a0000 (Reserved) 00000000000f0000-0000000000100000 (Reserved) 0000000000100000-00000000bffe0000 (System RAM) 00000000bffe0000-00000000c0000000 (Reserved) 00000000feffc000-00000000ff000000 (Reserved) 00000000fffc0000-0000000100000000 (Reserved) 0000000100000000-0000000140000000 (System RAM) Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: Jason Wang <jasowang@xxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> --- drivers/virtio/virtio_mem.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index 3101cbf9e59d..6f658d1aeac4 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -421,7 +421,8 @@ static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id) nid = memory_add_physaddr_to_nid(addr); dev_dbg(&vm->vdev->dev, "adding memory block: %lu\n", mb_id); - return add_memory(nid, addr, memory_block_size_bytes(), 0); + return add_memory(nid, addr, memory_block_size_bytes(), + MHP_DRIVER_MANAGED); } /* -- 2.25.3
