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authorTony Krowiak <akrowiak@linux.ibm.com>2018-09-25 19:16:19 -0400
committerChristian Borntraeger <borntraeger@de.ibm.com>2018-09-26 20:45:51 +0200
commit1fde573413b549d52183382e639c1d6ce88f5959 (patch)
tree977b28b6d6cd2ea43c17ce6a6adcd3d517047b40 /arch/s390/Kconfig
parente585b24aeb445493b6a581d6c42fa58f663e93e0 (diff)
s390: vfio-ap: base implementation of VFIO AP device driver
Introduces a new AP device driver. This device driver is built on the VFIO mediated device framework. The framework provides sysfs interfaces that facilitate passthrough access by guests to devices installed on the linux host. The VFIO AP device driver will serve two purposes: 1. Provide the interfaces to reserve AP devices for exclusive use by KVM guests. This is accomplished by unbinding the devices to be reserved for guest usage from the zcrypt device driver and binding them to the VFIO AP device driver. 2. Implements the functions, callbacks and sysfs attribute interfaces required to create one or more VFIO mediated devices each of which will be used to configure the AP matrix for a guest and serve as a file descriptor for facilitating communication between QEMU and the VFIO AP device driver. When the VFIO AP device driver is initialized: * It registers with the AP bus for control of type 10 (CEX4 and newer) AP queue devices. This limitation was imposed due to: 1. A desire to keep the code as simple as possible; 2. Some older models are no longer supported by the kernel and others are getting close to end of service. 3. A lack of older systems on which to test older devices. The probe and remove callbacks will be provided to support the binding/unbinding of AP queue devices to/from the VFIO AP device driver. * Creates a matrix device, /sys/devices/vfio_ap/matrix, to serve as the parent of the mediated devices created, one for each guest, and to hold the APQNs of the AP devices bound to the VFIO AP device driver. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Farhan Ali <alifm@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20180925231641.4954-5-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
-rw-r--r--arch/s390/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 9a9c7a6fe925..8cc8f25d9576 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -773,6 +773,17 @@ config VFIO_CCW
To compile this driver as a module, choose M here: the
module will be called vfio_ccw.
+config VFIO_AP
+ def_tristate n
+ prompt "VFIO support for AP devices"
+ depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
+ help
+ This driver grants access to Adjunct Processor (AP) devices
+ via the VFIO mediated device interface.
+
+ To compile this driver as a module, choose M here: the module
+ will be called vfio_ap.
+
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