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Diffstat (limited to 'Documentation/virtual/kvm')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index c25439a5827..4505f869e45 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2210,6 +2210,43 @@ This ioctl returns the guest registers that are supported for the KVM_GET_ONE_REG/KVM_SET_ONE_REG calls. +4.80 KVM_ARM_SET_DEVICE_ADDR + +Capability: KVM_CAP_ARM_SET_DEVICE_ADDR +Architectures: arm +Type: vm ioctl +Parameters: struct kvm_arm_device_address (in) +Returns: 0 on success, -1 on error +Errors: + ENODEV: The device id is unknown + ENXIO: Device not supported on current system + EEXIST: Address already set + E2BIG: Address outside guest physical address space + +struct kvm_arm_device_addr { + __u64 id; + __u64 addr; +}; + +Specify a device address in the guest's physical address space where guests +can access emulated or directly exposed devices, which the host kernel needs +to know about. The id field is an architecture specific identifier for a +specific device. + +ARM divides the id field into two parts, a device id and an address type id +specific to the individual device. + + bits: | 63 ... 32 | 31 ... 16 | 15 ... 0 | + field: | 0x00000000 | device id | addr type id | + +ARM currently only require this when using the in-kernel GIC support for the +hardware VGIC features, using KVM_ARM_DEVICE_VGIC_V2 as the device id. When +setting the base address for the guest's mapping of the VGIC virtual CPU +and distributor interface, the ioctl must be called after calling +KVM_CREATE_IRQCHIP, but before calling KVM_RUN on any of the VCPUs. Calling +this ioctl twice for any of the base addresses will return -EEXIST. + + 5. The kvm_run structure ------------------------ |