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37 lines
1.5 KiB
Plaintext
37 lines
1.5 KiB
Plaintext
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FLIC (floating interrupt controller)
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FLIC handles floating (non per-cpu) interrupts, i.e. I/O, service and some
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machine check interruptions. All interrupts are stored in a per-vm list of
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pending interrupts. FLIC performs operations on this list.
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Only one FLIC instance may be instantiated.
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FLIC provides support to
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- add interrupts (KVM_DEV_FLIC_ENQUEUE)
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- inspect currently pending interrupts (KVM_FLIC_GET_ALL_IRQS)
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- purge all pending floating interrupts (KVM_DEV_FLIC_CLEAR_IRQS)
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Groups:
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KVM_DEV_FLIC_ENQUEUE
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Passes a buffer and length into the kernel which are then injected into
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the list of pending interrupts.
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attr->addr contains the pointer to the buffer and attr->attr contains
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the length of the buffer.
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The format of the data structure kvm_s390_irq as it is copied from userspace
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is defined in usr/include/linux/kvm.h.
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KVM_DEV_FLIC_GET_ALL_IRQS
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Copies all floating interrupts into a buffer provided by userspace.
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When the buffer is too small it returns -ENOMEM, which is the indication
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for userspace to try again with a bigger buffer.
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All interrupts remain pending, i.e. are not deleted from the list of
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currently pending interrupts.
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attr->addr contains the userspace address of the buffer into which all
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interrupt data will be copied.
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attr->attr contains the size of the buffer in bytes.
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KVM_DEV_FLIC_CLEAR_IRQS
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Simply deletes all elements from the list of currently pending floating
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interrupts. No interrupts are injected into the guest.
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