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vdpa: device feature provisioning

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This patch allows the device features to be provisioned through
netlink. A new attribute is introduced to allow the userspace to pass
a 64bit device features during device adding.

This provides several advantages:

- Allow to provision a subset of the features to ease the cross vendor
  live migration.
- Better debug-ability for vDPA framework and parent.

Reviewed-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220927074810.28627-2-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2022-09-27 15:48:08 +08:00 • committed by Michael S. Tsirkin
parent 4959aebba8
commit 90fea5a800
3 changed files with 8 additions and 0 deletions
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2
include/uapi/linux/vdpa.h
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@ -52,6 +52,8 @@ enum vdpa_attr {
VDPA_ATTR_DEV_VENDOR_ATTR_NAME, /* string */
VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, /* u64 */
VDPA_ATTR_DEV_FEATURES, /* u64 */
/* new attributes must be added above here */
VDPA_ATTR_MAX,
};