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-rw-r--r--Documentation/virtual/kvm/devices/arm-vgic-its.txt20
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/devices/arm-vgic-its.txt b/Documentation/virtual/kvm/devices/arm-vgic-its.txt
index eb06beb75960..8d5830eab26a 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic-its.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic-its.txt
@@ -33,6 +33,10 @@ Groups:
request the initialization of the ITS, no additional parameter in
kvm_device_attr.addr.
+ KVM_DEV_ARM_ITS_CTRL_RESET
+ reset the ITS, no additional parameter in kvm_device_attr.addr.
+ See "ITS Reset State" section.
+
KVM_DEV_ARM_ITS_SAVE_TABLES
save the ITS table data into guest RAM, at the location provisioned
by the guest in corresponding registers/table entries.
@@ -157,3 +161,19 @@ Then vcpus can be started.
- pINTID is the physical LPI ID; if zero, it means the entry is not valid
and other fields are not meaningful.
- ICID is the collection ID
+
+ ITS Reset State:
+ ----------------
+
+RESET returns the ITS to the same state that it was when first created and
+initialized. When the RESET command returns, the following things are
+guaranteed:
+
+- The ITS is not enabled and quiescent
+ GITS_CTLR.Enabled = 0 .Quiescent=1
+- There is no internally cached state
+- No collection or device table are used
+ GITS_BASER<n>.Valid = 0
+- GITS_CBASER = 0, GITS_CREADR = 0, GITS_CWRITER = 0
+- The ABI version is unchanged and remains the one set when the ITS
+ device was first created.