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| author |   Pierre Morel <pmorel@linux.ibm.com> | 2019-05-21 17:34:36 +0200 |
|---|---|---|
| committer |   Vasily Gorbik <gor@linux.ibm.com> | 2019-07-02 16:00:28 +0200 |
| commit | ec89b55e3bce7c8a4bc6b1203280e81342d6745c (patch) | |
| tree | 15ff13ffdfac038461c049a881e0d29d78524458 /drivers/s390/crypto/vfio_ap_private.h | |
| parent | vfio: ap: register IOMMU VFIO notifier (diff) | |
| download | linux-dev-ec89b55e3bce7c8a4bc6b1203280e81342d6745c.tar.xz linux-dev-ec89b55e3bce7c8a4bc6b1203280e81342d6745c.zip | |
s390: ap: implement PAPQ AQIC interception in kernel
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/crypto/vfio_ap_private.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h index 18dcc4d769cc..f46dde56b464 100644 --- a/drivers/s390/crypto/vfio_ap_private.h +++ b/drivers/s390/crypto/vfio_ap_private.h @@ -4,6 +4,7 @@ * * Author(s): Tony Krowiak <akrowiak@linux.ibm.com> * Halil Pasic <pasic@linux.ibm.com> + * Pierre Morel <pmorel@linux.ibm.com> * * Copyright IBM Corp. 2018 */ @@ -89,5 +90,15 @@ struct ap_matrix_mdev { extern int vfio_ap_mdev_register(void); extern void vfio_ap_mdev_unregister(void); +int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi, + unsigned int retry); +struct vfio_ap_queue { + struct ap_matrix_mdev *matrix_mdev; + unsigned long saved_pfn; + int apqn; +#define VFIO_AP_ISC_INVALID 0xff + unsigned char saved_isc; +}; +struct ap_queue_status vfio_ap_irq_disable(struct vfio_ap_queue *q); #endif /* _VFIO_AP_PRIVATE_H_ */ |