linux-toradex.git/include/linux/virtio_config.h, branch v5.12-rc5

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2020-10-23T18:00:57+00:00

Pull virtio updates from Michael Tsirkin:
 "vhost, vdpa, and virtio cleanups and fixes

  A very quiet cycle, no new features"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  MAINTAINERS: add URL for virtio-mem
  vhost_vdpa: remove unnecessary spin_lock in vhost_vring_call
  vringh: fix __vringh_iov() when riov and wiov are different
  vdpa/mlx5: Setup driver only if VIRTIO_CONFIG_S_DRIVER_OK
  s390: virtio: PV needs VIRTIO I/O device protection
  virtio: let arch advertise guest's memory access restrictions
  vhost_vdpa: Fix duplicate included kernel.h
  vhost: reduce stack usage in log_used
  virtio-mem: Constify mem_id_table
  virtio_input: Constify id_table
  virtio-balloon: Constify id_table
  vdpa/mlx5: Fix failure to bring link up
  vdpa/mlx5: Make use of a specific 16 bit endianness API

virtio: let arch advertise guest's memory access restrictions

2020-10-21T14:34:12+00:00

An architecture may restrict host access to guest memory,
e.g. IBM s390 Secure Execution or AMD SEV.

Provide a new Kconfig entry the architecture can select,
CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, when it provides
the arch_has_restricted_virtio_memory_access callback to advertise
to VIRTIO common code when the architecture restricts memory access
from the host.

The common code can then fail the probe for any device where
VIRTIO_F_ACCESS_PLATFORM is required, but not set.

Signed-off-by: Pierre Morel 
Reviewed-by: Cornelia Huck 
Reviewed-by: Halil Pasic 
Link: https://lore.kernel.org/r/1599728030-17085-2-git-send-email-pmorel@linux.ibm.com
Signed-off-by: Michael S. Tsirkin 
Acked-by: Christian Borntraeger

virtio: Add get_shm_region method

2020-09-10T08:05:58+00:00

Virtio defines 'shared memory regions' that provide a continuously
shared region between the host and guest.

Provide a method to find a particular region on a device.

Signed-off-by: Sebastien Boeuf 
Signed-off-by: Dr. David Alan Gilbert 
Acked-by: Michael S. Tsirkin 
Cc: kvm@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Cc: "Michael S. Tsirkin" 
Signed-off-by: Miklos Szeredi

virtio_config: fix up warnings on parisc

2020-08-05T23:56:03+00:00

Apparently, on parisc le16_to_cpu returns an int. virtio_cread_le
is very strict about type sizes so it causes a warning.
Fix it up by casting to the correct type.

Reported-by: kernel test robot 
Signed-off-by: Michael S. Tsirkin 
Link: https://lore.kernel.org/r/20200805235550.1451637-1-mst@redhat.com

virtio_config: drop LE option from config space

2020-08-05T15:08:41+00:00

All drivers now use virtio_cread/write_le for LE config
space fields. Drop LE option from virtio_cread/write, only leaving
the option to access transitional fields.

Signed-off-by: Michael S. Tsirkin

virtio_config: add virtio_cread_le_feature

2020-08-05T15:08:41+00:00

Mirrors virtio_cread_feature but for LE fields.

Signed-off-by: Michael S. Tsirkin

virtio_config: LE config space accessors

2020-08-05T15:08:41+00:00

To be used by modern code, as well as to handle LE only fields such as
balloon.

Signed-off-by: Michael S. Tsirkin

virtio_config: disallow native type fields (again)

2020-08-05T15:08:41+00:00

_Generic version allowed __uXX types but that is no longer necessary:

Transitional devices should all use __virtioXX types (and __leXX for
fields not present in the legacy devices).
Modern ones should use __leXX.
_uXX type would be a bug.
Let's prevent that.

Signed-off-by: Michael S. Tsirkin

virtio_config: rewrite using _Generic

2020-08-05T15:08:40+00:00

Min compiler version has been raised, so that's ok now.

Signed-off-by: Michael S. Tsirkin

virtio_config: cread/write cleanup

2020-08-05T15:08:40+00:00

Use vars of the correct type instead of casting.

Signed-off-by: Michael S. Tsirkin