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