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FLIC (floating interrupt controller)
====================================
FLIC handles floating (non per-cpu) interrupts, i.e. I/O, service and some
machine check interruptions. All interrupts are stored in a per-vm list of
pending interrupts. FLIC performs operations on this list.
Only one FLIC instance may be instantiated.
FLIC provides support to
- add interrupts (KVM_DEV_FLIC_ENQUEUE)
- inspect currently pending interrupts (KVM_FLIC_GET_ALL_IRQS)
- purge all pending floating interrupts (KVM_DEV_FLIC_CLEAR_IRQS)
- enable/disable for the guest transparent async page faults
Groups:
KVM_DEV_FLIC_ENQUEUE
Passes a buffer and length into the kernel which are then injected into
the list of pending interrupts.
attr->addr contains the pointer to the buffer and attr->attr contains
the length of the buffer.
The format of the data structure kvm_s390_irq as it is copied from userspace
is defined in usr/include/linux/kvm.h.
KVM_DEV_FLIC_GET_ALL_IRQS
Copies all floating interrupts into a buffer provided by userspace.
When the buffer is too small it returns -ENOMEM, which is the indication
for userspace to try again with a bigger buffer.
All interrupts remain pending, i.e. are not deleted from the list of
currently pending interrupts.
attr->addr contains the userspace address of the buffer into which all
interrupt data will be copied.
attr->attr contains the size of the buffer in bytes.
KVM_DEV_FLIC_CLEAR_IRQS
Simply deletes all elements from the list of currently pending floating
interrupts. No interrupts are injected into the guest.
KVM_DEV_FLIC_APF_ENABLE
Enables async page faults for the guest. So in case of a major page fault
the host is allowed to handle this async and continues the guest.
KVM_DEV_FLIC_APF_DISABLE_WAIT
Disables async page faults for the guest and waits until already pending
async page faults are done. This is necessary to trigger a completion interrupt
for every init interrupt before migrating the interrupt list.
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