On Tue, 21 Nov 2017 11:08:01 -0500 Tony Krowiak <akrowiak@xxxxxxxxxxxxxxxxxx> wrote: > I am not quite sure what you are asking, but I'll attempt to answer > what I think you're asking. A new type of mediated matrix device > will be introduced to configure a virtual matrix for a guest that > provides the interfaces to map a virtual adapter/domain ID to one > or more real adapter/domain IDs. If by virtualization facility, > you are talking about the VFIO AP matrix driver, then yes, > the driver will handle ioctl requests based on the type of the > mediated matrix device through which the request was submitted: > > If the request is to configure the KVM guest's matrix: > > * If the mediated matrix device type is passthrough: > * Do validation of matrix > * Configure the APM, AQM and ADM in the KVM guest's CRYCB > according to the configuration specified via the mediated > device's sysfs attribute files. > * If the mediated matrix device type is virtual: > * Do validation of matrix > * No need to configure CRYCB since all instructions will be > intercepted Ok, so we would have two distinct paths here... > > If the request is to execute an intercepted AP instruction: > > * If the mediated matrix device type is passthrough: > * Forward the instruction to the AP device and return the > result to QEMU. > > * If the mediated matrix device type is virtual: > > * Retrieve all of the real APQNs mapped to the virtual > adapter and domain IDs configured in the mediated matrix > device's sysfs attribute files > * If there is more than one APQN mapping, then determine > which would be best to use - algorithm TBD > * Forward the instruction to the AP device and return the > result. ...and two distinct paths for most instructions here as well. > > Of course, these are just preliminary ideas at this time. > I've only prototyped the sysfs configuration interfaces. No > back end prototyping has been undertaken yet. If the ideas do > not pan out, however; I think virtualization can be introduced > as an independent design. Yes, let's cross that bridge when we get to it.
