Update the documentation to reflect the ordering requirements of
restoring GICv2 distributor registers and remove outdated limitations in
the documentation while we're at it.
Signed-off-by: Christoffer Dall <christoffer.dall@xxxxxxx>
---
Documentation/virtual/kvm/devices/arm-vgic.txt | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt
index b3ce126..c9a6393 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
@@ -49,9 +49,12 @@ Groups:
index is specified with the vcpu_index field. Note that most distributor
fields are not banked, but return the same value regardless of the
vcpu_index used to access the register.
- Limitations:
- - Priorities are not implemented, and registers are RAZ/WI
- - Currently only implemented for KVM_DEV_TYPE_ARM_VGIC_V2.
+
+ GICD_IIDR.Revision is updated when the KVM implementation of an emulated
+ GICv2 is changed. Userspace should read GICD_IIDR from KVM and write back
+ the read value to confirm its expected behavior is aligned with the KVM
+ implementation. To properly restore the interrupt group configuration,
+ GICD_IIDR should be written before any other registers.
Errors:
-ENXIO: Getting or setting this register is not yet supported
-EBUSY: One or more VCPUs are running
@@ -94,9 +97,6 @@ Groups:
use the lower 5 bits to communicate with the KVM device and must shift the
value left by 3 places to obtain the actual priority mask level.
- Limitations:
- - Priorities are not implemented, and registers are RAZ/WI
- - Currently only implemented for KVM_DEV_TYPE_ARM_VGIC_V2.
Errors:
-ENXIO: Getting or setting this register is not yet supported
-EBUSY: One or more VCPUs are running
--
2.7.4
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