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KVM: PPC: Document KVM_INTERRUPT ioctl
This adds some documentation for the KVM_INTERRUPT special cases that PowerPC now implements. Signed-off-by: Alexander Graf <agraf@suse.de>
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1 changed files with 31 additions and 2 deletions
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@ -320,13 +320,13 @@ struct kvm_translation {
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4.15 KVM_INTERRUPT
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Capability: basic
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Architectures: x86
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Architectures: x86, ppc
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Type: vcpu ioctl
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Parameters: struct kvm_interrupt (in)
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Returns: 0 on success, -1 on error
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Queues a hardware interrupt vector to be injected. This is only
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useful if in-kernel local APIC is not used.
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useful if in-kernel local APIC or equivalent is not used.
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/* for KVM_INTERRUPT */
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struct kvm_interrupt {
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@ -334,8 +334,37 @@ struct kvm_interrupt {
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__u32 irq;
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};
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X86:
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Note 'irq' is an interrupt vector, not an interrupt pin or line.
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PPC:
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Queues an external interrupt to be injected. This ioctl is overleaded
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with 3 different irq values:
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a) KVM_INTERRUPT_SET
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This injects an edge type external interrupt into the guest once it's ready
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to receive interrupts. When injected, the interrupt is done.
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b) KVM_INTERRUPT_UNSET
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This unsets any pending interrupt.
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Only available with KVM_CAP_PPC_UNSET_IRQ.
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c) KVM_INTERRUPT_SET_LEVEL
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This injects a level type external interrupt into the guest context. The
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interrupt stays pending until a specific ioctl with KVM_INTERRUPT_UNSET
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is triggered.
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Only available with KVM_CAP_PPC_IRQ_LEVEL.
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Note that any value for 'irq' other than the ones stated above is invalid
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and incurs unexpected behavior.
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4.16 KVM_DEBUG_GUEST
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Capability: basic
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