Re: [KVM PATCH v4 3/3] kvm: add iosignalfd support

Mark McLoughlin
2009-06-04T13:20:20Z

Hi Greg,

On Wed, 2009-06-03 at 18:04 -0400, Gregory Haskins wrote:
> Hi Mark,
> So with the v5 release of iosignalfd, we now have the notion of a
> "trigger", the API of which is as follows:
>
> -----------------------
> /*!
> * \brief Assign an eventfd to an IO port (PIO or MMIO)
> *
> * Assigns an eventfd based file-descriptor to a specific PIO or MMIO
> * address range. Any guest writes to the specified range will generate
> * an eventfd signal.
> *
> * A data-match pointer can be optionally provided in "trigger" and only
> * writes which match this value exactly will generate an event. The length
> * of the trigger is established by the length of the overall IO range, and
> * therefore must be in a natural byte-width for the IO routines of your
> * particular architecture (e.g. 1, 2, 4, or 8 bytes on x86_64).

This looks like it'll work fine for virtio-pci.

Thanks,
Mark.