linux.git/drivers/virtio/virtio.c, branch v3.19

virtio: set VIRTIO_CONFIG_S_FEATURES_OK on restore

2014-12-11T18:04:38+00:00

virtio 1.0 devices require that drivers set VIRTIO_CONFIG_S_FEATURES_OK
after finalizing features.
virtio core missed doing this on restore, fix it up.

Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck

virtio: drop legacy_only driver flag

2014-12-09T19:42:00+00:00

legacy_only flag is now unused, drop it from core.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Cornelia Huck

virtio: allow finalize_features to fail

2014-12-09T14:32:32+00:00

This will make it easy for transports to validate features and return
failure.

Signed-off-by: Michael S. Tsirkin

virtio: add API to detect legacy devices

2014-12-09T10:06:33+00:00

transports need to be able to detect legacy-only
devices (ATM balloon only) to use legacy path
to drive them.

Add a core API to do just that.
The implementation just blacklists balloon:
not too pretty, but let's not over-engineer.

Signed-off-by: Michael S. Tsirkin 
Acked-by: Cornelia Huck

virtio: make VIRTIO_F_VERSION_1 a transport bit

2014-12-09T10:06:32+00:00

Activate VIRTIO_F_VERSION_1 automatically unless legacy_only
is set.

Signed-off-by: Michael S. Tsirkin

virtio: add legacy feature table support

2014-12-09T10:05:26+00:00

virtio-blk has some legacy feature bits that modern drivers
must not negotiate, but are needed for old legacy hosts
(that e.g. don't support virtio-scsi).
Allow a separate legacy feature table for such cases.

Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck

virtio: simplify feature bit handling

2014-12-09T10:05:25+00:00

Now that we use u64 for bits, we can simply & them together.

Signed-off-by: Michael S. Tsirkin 
Reviewed-by: David Hildenbrand 
Reviewed-by: Cornelia Huck

virtio: set FEATURES_OK

2014-12-09T10:05:25+00:00

set FEATURES_OK as per virtio 1.0 spec

Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck

virtio: add support for 64 bit features.

2014-12-09T10:05:24+00:00

Change u32 to u64, and use BIT_ULL and 1ULL everywhere.

Note: transports are unchanged, and only set low 32 bit.
This guarantees that no transport sets e.g. VERSION_1
by mistake without proper support.

Based on patch by Rusty.

Signed-off-by: Rusty Russell 
Signed-off-by: Cornelia Huck 
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: David Hildenbrand 
Reviewed-by: Cornelia Huck

virtio: use u32, not bitmap for features

2014-12-09T10:05:23+00:00

It seemed like a good idea to use bitmap for features
in struct virtio_device, but it's actually a pain,
and seems to become even more painful when we get more
than 32 feature bits.  Just change it to a u32 for now.

Based on patch by Rusty.

Suggested-by: David Hildenbrand 
Signed-off-by: Rusty Russell 
Signed-off-by: Cornelia Huck 
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Cornelia Huck