On 17/04/2018 18:14, Tony Krowiak wrote:
On 04/16/2018 09:13 AM, Pierre Morel wrote:
On 15/04/2018 23:22, Tony Krowiak wrote:
This patch provides documentation describing the AP architecture and
design concepts behind the virtualization of AP devices. It also
...snip...
+The process for reserving an AP queue for use by a KVM guest is:
+
+* The vfio-ap driver during its initialization will perform the
following:
+ * Create the 'vfio_ap' root device - /sys/devices/vfio_ap
+ * Create the 'matrix' device in the 'vfio_ap' root
+ * Register the matrix device with the device core
+* Register with the ap_bus for AP queue devices of type CEX4, CEX5 and
+ CEX6 and to provide the vfio_ap driver's probe and remove
callback interfaces.
I wonder why the type of card has anything to do with this driver.
It should be transparent, the driver should be able to provide the
matrix (APM/AQM/ADM)
independently from the type of card in the slot.
We've been down this road several times before. We are only supporting
virtualization of
CEX4 and newer cards. Also, the AP bus requires registering for
specific card types.
Yes I know, but the AP BUS design may be not the optimal for the AP Matrix.
The AP Matrix is device independent.
We just write/clear bits in a matrix and we do not care what is plugged.
So may be make clear that this device dependence is due to the actual AP
BUS interface design.
Regards,
Pierre
--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany
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