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    SubjectRe: [PATCH] kvm: fast-path msi injection with irqfd
    On Thu, Nov 18, 2010 at 07:09:08PM +0200, Michael S. Tsirkin wrote:
    > Store irq routing table pointer in the irqfd object,
    > and use that to inject MSI directly without bouncing out to
    > a kernel thread.
    >
    > While we touch this structure, rearrange irqfd fields to make fastpath
    > better packed for better cache utilization.
    >
    > This also adds some comments about locking rules and rcu usage in code.
    >
    > Some notes on the design:
    > - Use pointer into the rt instead of copying an entry,
    > to make it possible to use rcu, thus side-stepping
    > locking complexities. We also save some memory this way.
    > - Old workqueue code is still used for level irqs.
    > I don't think we DTRT with level anyway, however,
    > it seems easier to keep the code around as
    > it has been thought through and debugged, and fix level later than
    > rip out and re-instate it later.
    >
    > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
    > ---
    >
    > OK, this seems to work fine for me. Tested with virtio-net in guest
    > with and without vhost-net. Pls review/apply if appropriate.

    Acked-by: Marcelo Tosatti <mtosatti@redhat.com>



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