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| author | Christoffer Dall <christoffer.dall@arm.com> | 2018-07-16 15:06:27 +0200 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-07-21 17:02:30 +0200 |
| commit | 327432c2469e0069679009886556d15eeddeb0cc (patch) | |
| tree | 5ebfb27de793cbf69b189e0c09a15f2cc4f4f3b4 /Documentation/virtual | |
| parent | KVM: arm/arm64: vgic: Let userspace opt-in to writable v2 IGROUPR (diff) | |
| download | linux-327432c2469e0069679009886556d15eeddeb0cc.tar.xz linux-327432c2469e0069679009886556d15eeddeb0cc.zip | |
KVM: arm/arm64: vgic: Update documentation of the GIC devices wrt IIDR
Update the documentation to reflect the ordering requirements of
restoring the GICD_IIDR register before any other registers and the
effects this has on restoring the interrupt groups for an emulated GICv2
instance.
Also remove some outdated limitations in the documentation while we're
at it.
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/devices/arm-vgic-v3.txt | 8 | ||||
| -rw-r--r-- | Documentation/virtual/kvm/devices/arm-vgic.txt | 15 |
2 files changed, 17 insertions, 6 deletions
diff --git a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt index 2408ab720ef7..ff290b43c8e5 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic-v3.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic-v3.txt @@ -100,6 +100,14 @@ Groups: Note that distributor fields are not banked, but return the same value regardless of the mpidr used to access the register. + GICD_IIDR.Revision is updated when the KVM implementation is changed in a + way directly observable by the guest or userspace. Userspace should read + GICD_IIDR from KVM and write back the read value to confirm its expected + behavior is aligned with the KVM implementation. Userspace should set + GICD_IIDR before setting any other registers to ensure the expected + behavior. + + The GICD_STATUSR and GICR_STATUSR registers are architecturally defined such that a write of a clear bit has no effect, whereas a write with a set bit clears that value. To allow userspace to freely set the values of these two diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt index b3ce12643553..97b6518148f8 100644 --- a/Documentation/virtual/kvm/devices/arm-vgic.txt +++ b/Documentation/virtual/kvm/devices/arm-vgic.txt @@ -49,9 +49,15 @@ 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 in a way directly observable by the guest or userspace. + Userspace should read GICD_IIDR from KVM and write back the read value to + confirm its expected behavior is aligned with the KVM implementation. + Userspace should set GICD_IIDR before setting any other registers (both + KVM_DEV_ARM_VGIC_GRP_DIST_REGS and KVM_DEV_ARM_VGIC_GRP_CPU_REGS) to ensure + the expected behavior. Unless GICD_IIDR has been set from userspace, writes + to the interrupt group registers (GICD_IGROUPR) are ignored. Errors: -ENXIO: Getting or setting this register is not yet supported -EBUSY: One or more VCPUs are running @@ -94,9 +100,6 @@ 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 |