From 6f7a2bd41fa8d52cbf5f32fdf8ba659d4ce4ae59 Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Tue, 31 Aug 2010 02:03:32 +0200 Subject: 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 --- Documentation/kvm/api.txt | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) (limited to 'Documentation') diff --git a/Documentation/kvm/api.txt b/Documentation/kvm/api.txt index 44d9893..24d6341 100644 --- a/Documentation/kvm/api.txt +++ b/Documentation/kvm/api.txt @@ -320,13 +320,13 @@ struct kvm_translation { 4.15 KVM_INTERRUPT Capability: basic -Architectures: x86 +Architectures: x86, ppc Type: vcpu ioctl Parameters: struct kvm_interrupt (in) Returns: 0 on success, -1 on error Queues a hardware interrupt vector to be injected. This is only -useful if in-kernel local APIC is not used. +useful if in-kernel local APIC or equivalent is not used. /* for KVM_INTERRUPT */ struct kvm_interrupt { @@ -334,8 +334,37 @@ struct kvm_interrupt { __u32 irq; }; +X86: + Note 'irq' is an interrupt vector, not an interrupt pin or line. +PPC: + +Queues an external interrupt to be injected. This ioctl is overleaded +with 3 different irq values: + +a) KVM_INTERRUPT_SET + + This injects an edge type external interrupt into the guest once it's ready + to receive interrupts. When injected, the interrupt is done. + +b) KVM_INTERRUPT_UNSET + + This unsets any pending interrupt. + + Only available with KVM_CAP_PPC_UNSET_IRQ. + +c) KVM_INTERRUPT_SET_LEVEL + + This injects a level type external interrupt into the guest context. The + interrupt stays pending until a specific ioctl with KVM_INTERRUPT_UNSET + is triggered. + + Only available with KVM_CAP_PPC_IRQ_LEVEL. + +Note that any value for 'irq' other than the ones stated above is invalid +and incurs unexpected behavior. + 4.16 KVM_DEBUG_GUEST Capability: basic -- cgit v1.1