Il 26/10/2012 13:09, Benjamin Herrenschmidt ha scritto:
> The only cases I can think of are the association between a virtual
> interrupt (ie, an interrupt in the guest interrupt number space) and an
> in-kernel source for that interrupt, ie, vhost and PCI pass-through
> essentially.
If you exclude old-style PCI pass-through and limit yourself to vhost
and VFIO, you can treat irqfd as "the" in-kernel source of the
interrupt. Then you need a mapping between MSIs and numbers used in
KVM_IRQFD ("GSIs").
This is what KVM_SET_GSI_ROUTING modifies, and basically the mapping is
modified every time a vector is masked/unmasked in the MSI-X table.
Paolo
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