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- Generic vcpu interface
- ====================================
- The virtual cpu "device" also accepts the ioctls KVM_SET_DEVICE_ATTR,
- KVM_GET_DEVICE_ATTR, and KVM_HAS_DEVICE_ATTR. The interface uses the same struct
- kvm_device_attr as other devices, but targets VCPU-wide settings and controls.
- The groups and attributes per virtual cpu, if any, are architecture specific.
- 1. GROUP: KVM_ARM_VCPU_PMU_V3_CTRL
- Architectures: ARM64
- 1.1. ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_IRQ
- Parameters: in kvm_device_attr.addr the address for PMU overflow interrupt is a
- pointer to an int
- Returns: -EBUSY: The PMU overflow interrupt is already set
- -ENXIO: The overflow interrupt not set when attempting to get it
- -ENODEV: PMUv3 not supported
- -EINVAL: Invalid PMU overflow interrupt number supplied
- A value describing the PMUv3 (Performance Monitor Unit v3) overflow interrupt
- number for this vcpu. This interrupt could be a PPI or SPI, but the interrupt
- type must be same for each vcpu. As a PPI, the interrupt number is the same for
- all vcpus, while as an SPI it must be a separate number per vcpu.
- 1.2 ATTRIBUTE: KVM_ARM_VCPU_PMU_V3_INIT
- Parameters: no additional parameter in kvm_device_attr.addr
- Returns: -ENODEV: PMUv3 not supported
- -ENXIO: PMUv3 not properly configured as required prior to calling this
- attribute
- -EBUSY: PMUv3 already initialized
- Request the initialization of the PMUv3. This must be done after creating the
- in-kernel irqchip. Creating a PMU with a userspace irqchip is currently not
- supported.
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