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KVM: Document KVM_NMI 

Signed-off-by: Avi Kivity <avi@redhat.com>
hifive-unleashed-5.1
Avi Kivity 2011-12-07 12:42:47 +02:00
parent 234b639206
commit 3f745f1e22
1 changed files with 25 additions and 0 deletions
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25
Documentation/virtual/kvm/api.txt
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@ -1466,6 +1466,31 @@ is supported; 2 if the processor requires all virtual machines to have
an RMA, or 1 if the processor can use an RMA but doesn't require it,
because it supports the Virtual RMA (VRMA) facility.
4.64 KVM_NMI
Capability: KVM_CAP_USER_NMI
Architectures: x86
Type: vcpu ioctl
Parameters: none
Returns: 0 on success, -1 on error
Queues an NMI on the thread's vcpu. Note this is well defined only
when KVM_CREATE_IRQCHIP has not been called, since this is an interface
between the virtual cpu core and virtual local APIC. After KVM_CREATE_IRQCHIP
has been called, this interface is completely emulated within the kernel.
To use this to emulate the LINT1 input with KVM_CREATE_IRQCHIP, use the
following algorithm:
- pause the vpcu
- read the local APIC's state (KVM_GET_LAPIC)
- check whether changing LINT1 will queue an NMI (see the LVT entry for LINT1)
- if so, issue KVM_NMI
- resume the vcpu
Some guests configure the LINT1 NMI input to cause a panic, aiding in
debugging.
5. The kvm_run structure
Application code obtains a pointer to the kvm_run structure by