linux-toradex.git/include/uapi/linux/vhost.h, branch v6.4-rc1

vhost-vdpa: uAPI to resume the device

2023-02-21T00:26:56+00:00

This new ioctl adds support for resuming the device from userspace.

This is required when trying to restore the device in a functioning
state after it's been suspended. It is already possible to reset a
suspended device, but that means the device must be reconfigured and
all the IOMMU/IOTLB mappings must be recreated. This new operation
allows the device to be resumed without going through a full reset.

This is particularly useful when trying to perform offline migration of
a virtual machine (also known as snapshot/restore) as it allows the VMM
to resume the virtual machine back to a running state after the snapshot
is performed.

Acked-by: Jason Wang 
Signed-off-by: Sebastien Boeuf 
Message-Id: <73b75fb87d25cff59768b4955a81fe7ffe5b4770.1672742878.git.sebastien.boeuf@intel.com>
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Stefano Garzarella

vhost-vdpa: uAPI to suspend the device

2022-08-11T08:31:15+00:00

The ioctl adds support for suspending the device from userspace.

This is a must before getting virtqueue indexes (base) for live migration,
since the device could modify them after userland gets them. There are
individual ways to perform that action for some devices
(VHOST_NET_SET_BACKEND, VHOST_VSOCK_SET_RUNNING, ...) but there was no
way to perform it for any vhost device (and, in particular, vhost-vdpa).

After a successful return of the ioctl call the device must not process
more virtqueue descriptors. The device can answer to read or writes of
config fields as if it were not suspended. In particular, writing to
"queue_enable" with a value of 1 will not make the device start
processing buffers of the virtqueue.

Signed-off-by: Eugenio Pérez 
Message-Id: <20220810171512.2343333-4-eperezma@redhat.com>
Signed-off-by: Michael S. Tsirkin

vhost-vdpa: introduce uAPI to set group ASID

2022-05-31T16:44:31+00:00

Follows the vDPA support for associating ASID to a specific virtqueue
group. This patch adds a uAPI to support setting them from userspace.

Signed-off-by: Jason Wang 
Signed-off-by: Gautam Dawar 
Message-Id: <20220330180436.24644-15-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin

vhost-vdpa: uAPI to get virtqueue group id

2022-05-31T16:44:31+00:00

Follows the support for virtqueue group in vDPA. This patches
introduces uAPI to get the virtqueue group ID for a specific virtqueue
in vhost-vdpa.

Signed-off-by: Jason Wang 
Signed-off-by: Gautam Dawar 
Message-Id: <20220330180436.24644-14-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin

vhost-vdpa: introduce uAPI to get the number of address spaces

2022-05-31T16:44:30+00:00

This patch introduces the uAPI for getting the number of address
spaces supported by this vDPA device.

Signed-off-by: Jason Wang 
Signed-off-by: Gautam Dawar 
Message-Id: <20220330180436.24644-13-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin

vhost-vdpa: introduce uAPI to get the number of virtqueue groups

2022-05-31T16:44:30+00:00

Follows the vDPA support for multiple address spaces, this patch
introduce uAPI for the userspace to know the number of virtqueue
groups supported by the vDPA device.

Signed-off-by: Jason Wang 
Signed-off-by: Gautam Dawar 
Message-Id: <20220330180436.24644-12-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin

vhost: move the backend feature bits to vhost_types.h

2022-05-31T16:44:25+00:00

We should store feature bits in vhost_types.h as what has been done
for e.g VHOST_F_LOG_ALL.

Signed-off-by: Jason Wang 
Signed-off-by: Gautam Dawar 
Message-Id: <20220330180436.24644-2-gdawar@xilinx.com>
Signed-off-by: Michael S. Tsirkin

vdpa: support exposing the count of vqs to userspace

2022-03-28T20:53:00+00:00

- GET_VQS_COUNT: the count of virtqueues that exposed

Signed-off-by: Longpeng 
Link: https://lore.kernel.org/r/20220315032553.455-4-longpeng2@huawei.com
Signed-off-by: Michael S. Tsirkin 
Acked-by: Jason Wang 
Signed-off-by: Longpeng <longpeng2@huawei.com>

Reviewed-by: Stefano Garzarella

vdpa: support exposing the config size to userspace

2022-03-28T20:53:00+00:00

- GET_CONFIG_SIZE: return the size of the virtio config space.

The size contains the fields which are conditional on feature
bits.

Acked-by: Jason Wang 
Signed-off-by: Longpeng 
Link: https://lore.kernel.org/r/20220315032553.455-2-longpeng2@huawei.com
Signed-off-by: Michael S. Tsirkin 
Reviewed-by: Stefano Garzarella

vhost: vdpa: report iova range

2020-10-23T15:55:28+00:00

This patch introduces a new ioctl for vhost-vdpa device that can
report the iova range by the device.

For device that implements get_iova_range() method, we fetch it from
the vDPA device. If device doesn't implement get_iova_range() but
depends on platform IOMMU, we will query via DOMAIN_ATTR_GEOMETRY,
otherwise [0, ULLONG_MAX] is assumed.

For safety, this patch also rules out the map request which is not in
the valid range.

Signed-off-by: Jason Wang 
Link: https://lore.kernel.org/r/20201023090043.14430-3-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin