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We register a AP PQAP instruction hook during the open of the mediated device. And unregister it on release. During the probe of the AP device, we allocate a vfio_ap_queue structure to keep track of the information we need for the PQAP/AQIC instruction interception. In the AP PQAP instruction hook, if we receive a demand to enable IRQs, - we retrieve the vfio_ap_queue based on the APQN we receive in REG1, - we retrieve the page of the guest address, (NIB), from register REG2 - we retrieve the mediated device to use the VFIO pinning infrastructure to pin the page of the guest address, - we retrieve the pointer to KVM to register the guest ISC and retrieve the host ISC - finaly we activate GISA If we receive a demand to disable IRQs, - we deactivate GISA - unregister from the GIB - unpin the NIB When removing the AP device from the driver the device is reseted and this process unregisters the GISA from the GIB, and unpins the NIB address then we free the vfio_ap_queue structure. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Acked-by: Tony Krowiak <akrowiak@linux.ibm.com> Acked-by: Harald Freudenberger <freude@linux.ibm.com> Signed-off-by: Halil Pasic <pasic@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> |
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