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virtio-mem: Allow to specify an ACPI PXM as nid

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We want to allow to specify (similar as for a DIMM), to which node a
virtio-mem device (and, therefore, its memory) belongs. Add a new
virtio-mem feature flag and export pxm_to_node, so it can be used in kernel
module context.

Acked-by: Michal Hocko <mhocko@suse.com> # for the export
Acked-by: "Rafael J. Wysocki" <rafael@kernel.org> # for the export
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Tested-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Len Brown <lenb@kernel.org>
Cc: linux-acpi@vger.kernel.org
Signed-off-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20200507140139.17083-4-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
David Hildenbrand
2020-05-07 16:01:27 +02:00
committed by Michael S. Tsirkin
parent dfb0b2e46d
commit f2af6d3978
3 changed files with 47 additions and 3 deletions
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10
include/uapi/linux/virtio_mem.h
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@@ -83,6 +83,12 @@
* device is busy.
*/
/* --- virtio-mem: feature bits --- */
/* node_id is an ACPI PXM and is valid */
#define VIRTIO_MEM_F_ACPI_PXM 0
/* --- virtio-mem: guest -> host requests --- */
/* request to plug memory blocks */
@@ -177,7 +183,9 @@ struct virtio_mem_resp {
struct virtio_mem_config {
/* Block size and alignment. Cannot change. */
__u32 block_size;
__u32 padding;
/* Valid with VIRTIO_MEM_F_ACPI_PXM. Cannot change. */
__u16 node_id;
__u16 padding;
/* Start address of the memory region. Cannot change. */
__u64 addr;
/* Region size (maximum). Cannot change. */