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authorCornelia Huck <cornelia.huck@de.ibm.com>2013-07-15 15:36:01 +0400
committerCornelia Huck <cornelia.huck@de.ibm.com>2014-03-21 16:42:49 +0400
commit841b91c584b6d1e2a2cb508bd2d0236cd37e1750 (patch)
tree0a2f1b2cfa471cefa22bc9c12628361ed2c0ac4c /Documentation/virtual
parentd938dc55225a7212e7f31c5a8571da304cc3de16 (diff)
downloadlinux-841b91c584b6d1e2a2cb508bd2d0236cd37e1750.tar.xz
KVM: s390: adapter interrupt sources
Add a new interface to register/deregister sources of adapter interrupts identified by an unique id via the flic. Adapters may also be maskable and carry a list of pinned pages. These adapters will be used by irq routing later. Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/devices/s390_flic.txt45
1 files changed, 45 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt
index 410fa673e5b6..4ceef53164b0 100644
--- a/Documentation/virtual/kvm/devices/s390_flic.txt
+++ b/Documentation/virtual/kvm/devices/s390_flic.txt
@@ -12,6 +12,7 @@ FLIC provides support to
- inspect currently pending interrupts (KVM_FLIC_GET_ALL_IRQS)
- purge all pending floating interrupts (KVM_DEV_FLIC_CLEAR_IRQS)
- enable/disable for the guest transparent async page faults
+- register and modify adapter interrupt sources (KVM_DEV_FLIC_ADAPTER_*)
Groups:
KVM_DEV_FLIC_ENQUEUE
@@ -44,3 +45,47 @@ Groups:
Disables async page faults for the guest and waits until already pending
async page faults are done. This is necessary to trigger a completion interrupt
for every init interrupt before migrating the interrupt list.
+
+ KVM_DEV_FLIC_ADAPTER_REGISTER
+ Register an I/O adapter interrupt source. Takes a kvm_s390_io_adapter
+ describing the adapter to register:
+
+struct kvm_s390_io_adapter {
+ __u32 id;
+ __u8 isc;
+ __u8 maskable;
+ __u8 swap;
+ __u8 pad;
+};
+
+ id contains the unique id for the adapter, isc the I/O interruption subclass
+ to use, maskable whether this adapter may be masked (interrupts turned off)
+ and swap whether the indicators need to be byte swapped.
+
+
+ KVM_DEV_FLIC_ADAPTER_MODIFY
+ Modifies attributes of an existing I/O adapter interrupt source. Takes
+ a kvm_s390_io_adapter_req specifiying the adapter and the operation:
+
+struct kvm_s390_io_adapter_req {
+ __u32 id;
+ __u8 type;
+ __u8 mask;
+ __u16 pad0;
+ __u64 addr;
+};
+
+ id specifies the adapter and type the operation. The supported operations
+ are:
+
+ KVM_S390_IO_ADAPTER_MASK
+ mask or unmask the adapter, as specified in mask
+
+ KVM_S390_IO_ADAPTER_MAP
+ perform a gmap translation for the guest address provided in addr,
+ pin a userspace page for the translated address and add it to the
+ list of mappings
+
+ KVM_S390_IO_ADAPTER_UNMAP
+ release a userspace page for the translated address specified in addr
+ from the list of mappings