A new sysfs attribute, ap_config, for the vfio_ap driver is
documented.
Signed-off-by: Jason J. Herne <[email protected]>
---
Documentation/arch/s390/vfio-ap.rst | 30 +++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/Documentation/arch/s390/vfio-ap.rst b/Documentation/arch/s390/vfio-ap.rst
index 929ee1c1c940..6056a50ee841 100644
--- a/Documentation/arch/s390/vfio-ap.rst
+++ b/Documentation/arch/s390/vfio-ap.rst
@@ -380,6 +380,36 @@ matrix device.
control_domains:
A read-only file for displaying the control domain numbers assigned to the
vfio_ap mediated device.
+ ap_config:
+ A read/write file that, when written to, allows all three of the
+ vfio_ap mediated device's ap matrix masks to be replaced in one shot.
+ Three masks are given, one for adapters, one for domains, and one for
+ control domains. If the given state cannot be set then no changes are
+ made to the vfio-ap mediated device.
+
+ The format of the data written to ap_config is as follows:
+ {amask},{dmask},{cmask}\n
+
+ \n is a newline character.
+
+ amask, dmask, and cmask are masks identifying which adapters, domains,
+ and control domains should be assigned to the mediated device.
+
+ The format of a mask is as follows:
+ 0xNN..NN
+
+ Where NN..NN is 64 hexadecimal characters representing a 256-bit value.
+ The leftmost (highest order) bit represents adapter/domain 0.
+
+ For an example set of masks that represent your mdev's current
+ configuration, simply cat ap_config.
+
+ Setting an adapter or domain number greater than the maximum allowed for
+ the system will result in an error.
+
+ This attribute is intended to be used by automation. End users would be
+ better served using the respective assign/unassign attributes for
+ adapters, domains, and control domains.
* functions:
--
2.41.0
Reviewed-by: Anthony Krowiak <[email protected]>
On 3/13/24 4:58 PM, Jason J. Herne wrote:
> A new sysfs attribute, ap_config, for the vfio_ap driver is
> documented.
>
> Signed-off-by: Jason J. Herne <[email protected]>
> ---
> Documentation/arch/s390/vfio-ap.rst | 30 +++++++++++++++++++++++++++++
> 1 file changed, 30 insertions(+)
>
> diff --git a/Documentation/arch/s390/vfio-ap.rst b/Documentation/arch/s390/vfio-ap.rst
> index 929ee1c1c940..6056a50ee841 100644
> --- a/Documentation/arch/s390/vfio-ap.rst
> +++ b/Documentation/arch/s390/vfio-ap.rst
> @@ -380,6 +380,36 @@ matrix device.
> control_domains:
> A read-only file for displaying the control domain numbers assigned to the
> vfio_ap mediated device.
> + ap_config:
> + A read/write file that, when written to, allows all three of the
> + vfio_ap mediated device's ap matrix masks to be replaced in one shot.
> + Three masks are given, one for adapters, one for domains, and one for
> + control domains. If the given state cannot be set then no changes are
> + made to the vfio-ap mediated device.
> +
> + The format of the data written to ap_config is as follows:
> + {amask},{dmask},{cmask}\n
> +
> + \n is a newline character.
> +
> + amask, dmask, and cmask are masks identifying which adapters, domains,
> + and control domains should be assigned to the mediated device.
> +
> + The format of a mask is as follows:
> + 0xNN..NN
> +
> + Where NN..NN is 64 hexadecimal characters representing a 256-bit value.
> + The leftmost (highest order) bit represents adapter/domain 0.
> +
> + For an example set of masks that represent your mdev's current
> + configuration, simply cat ap_config.
> +
> + Setting an adapter or domain number greater than the maximum allowed for
> + the system will result in an error.
> +
> + This attribute is intended to be used by automation. End users would be
> + better served using the respective assign/unassign attributes for
> + adapters, domains, and control domains.
>
> * functions:
>