Messages in this thread |  | | Date | Sun, 29 Nov 2020 02:17:17 +0100 | From | Halil Pasic <> | Subject | Re: [PATCH v12 11/17] s390/vfio-ap: allow assignment of unavailable AP queues to mdev device |
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On Tue, 24 Nov 2020 16:40:10 -0500 Tony Krowiak <akrowiak@linux.ibm.com> wrote:
> The current implementation does not allow assignment of an AP adapter or > domain to an mdev device if each APQN resulting from the assignment > does not reference an AP queue device that is bound to the vfio_ap device > driver. This patch allows assignment of AP resources to the matrix mdev as > long as the APQNs resulting from the assignment: > 1. Are not reserved by the AP BUS for use by the zcrypt device drivers. > 2. Are not assigned to another matrix mdev. > > The rationale behind this is twofold: > 1. The AP architecture does not preclude assignment of APQNs to an AP > configuration that are not available to the system. > 2. APQNs that do not reference a queue device bound to the vfio_ap > device driver will not be assigned to the guest's CRYCB, so the > guest will not get access to queues not bound to the vfio_ap driver. > > Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Again code looks good. I'm still worried about all the incremental changes (good for review) and their testability.
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