Add documentation for the new exit code.

Signed-off-by: Pavel Fedin <>
 Documentation/virtual/kvm/api.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/virtual/kvm/api.txt 
index 092ee9f..d8aae4c 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3331,6 +3331,20 @@ the userspace IOAPIC should process the EOI and 
retrigger the interrupt if
 it is still asserted.  Vector is the LAPIC interrupt vector for which the
 EOI was received.
+               /* KVM_EXIT_IRQ */
+               struct kvm_irq_level irq;
+Indicates that an interrupt happens, to be processed by irqchip implemented in
+userspace. irq.irq specifies the raw IRQ number, and irq.status is to be
+interpreted according to interrupt type:
+ For level-triggered interrupts irq.status is set to new level of the line, and
+  the exit happens upon level change.
+ For edge-triggered interrupts irq.status is set to active level of the line
+  (low or high), and the exit happens when the line is pulsed.
+CPU-private interrupts (like per-CPU timers) belong to the vCPU where the exit
                /* Fix the size of the union. */
                char padding[256];

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