diff options
| author | David Hildenbrand <david@redhat.com> | 2021-12-17 14:40:37 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-01-07 19:30:13 -0500 |
| commit | 3ff9b192de6501e5f15de2586b8560966436bf25 (patch) | |
| tree | 1e0ffc15889df59683c9eb3c0cb2b2269ffdc816 /include/standard-headers | |
| parent | d135536d5f33aeb0c5a937901bccc13fc0f01187 (diff) | |
linux-headers: sync VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE
Let's synchronize the new feature flag, available in Linux since
v5.16-rc1.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20211217134039.29670-2-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/standard-headers')
| -rw-r--r-- | include/standard-headers/linux/virtio_mem.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/standard-headers/linux/virtio_mem.h b/include/standard-headers/linux/virtio_mem.h index 05e5ade75d..18c74c527c 100644 --- a/include/standard-headers/linux/virtio_mem.h +++ b/include/standard-headers/linux/virtio_mem.h @@ -68,9 +68,10 @@ * explicitly triggered (VIRTIO_MEM_REQ_UNPLUG). * * There are no guarantees what will happen if unplugged memory is - * read/written. Such memory should, in general, not be touched. E.g., - * even writing might succeed, but the values will simply be discarded at - * random points in time. + * read/written. In general, unplugged memory should not be touched, because + * the resulting action is undefined. There is one exception: without + * VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE, unplugged memory inside the usable + * region can be read, to simplify creation of memory dumps. * * It can happen that the device cannot process a request, because it is * busy. The device driver has to retry later. @@ -87,6 +88,8 @@ /* node_id is an ACPI PXM and is valid */ #define VIRTIO_MEM_F_ACPI_PXM 0 +/* unplugged memory must not be accessed */ +#define VIRTIO_MEM_F_UNPLUGGED_INACCESSIBLE 1 /* --- virtio-mem: guest -> host requests --- */ |