Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy
Date	2015-09-15 18:50 +0200
Message-ID	<q91AD-24K-31@gated-at.bofh.it> (permalink)
References	(1 earlier) <q8SdX-5qT-15@gated-at.bofh.it> <q901P-8qX-15@gated-at.bofh.it> <q917z-1wr-7@gated-at.bofh.it> <q91hg-1HO-9@gated-at.bofh.it> <q91AC-24K-11@gated-at.bofh.it>
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On 15/09/2015 18:44, Cornelia Huck wrote:
>> > Can you explain why?  If there is any non-zero valid length, "wildcard
>> > length" (represented by zero) would also make sense.
> What is a wildcard match supposed to mean in this case? The datamatch
> field contains the queue index for the device specified in the address
> field. The hypercall interface associated with the eventfd always has
> device + queue index in its parameters; there is no interface for
> "notify device with all its queues".

Ah, I see.  Because all valid virtio-ccw ioeventfds are datamatch, no
valid virtio-ccw ioeventfd is wildcard-length.

Paolo
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Thread

[PATCH V6 0/6] Fast mmio eventfd fixes Jason Wang <jasowang@redhat.com> - 2015-09-15 08:50 +0200
  [PATCH V6 6/6] kvm: add fast mmio capabilitiy Jason Wang <jasowang@redhat.com> - 2015-09-15 08:50 +0200
    Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy Paolo Bonzini <pbonzini@redhat.com> - 2015-09-15 17:10 +0200
      Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy Cornelia Huck <cornelia.huck@de.ibm.com> - 2015-09-15 18:20 +0200
        Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy Paolo Bonzini <pbonzini@redhat.com> - 2015-09-15 18:30 +0200
          Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy Cornelia Huck <cornelia.huck@de.ibm.com> - 2015-09-15 18:50 +0200
            Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy Paolo Bonzini <pbonzini@redhat.com> - 2015-09-15 18:50 +0200
  [PATCH V6 2/6] kvm: factor out core eventfd assign/deassign logic Jason Wang <jasowang@redhat.com> - 2015-09-15 08:50 +0200
    Re: [PATCH V6 2/6] kvm: factor out core eventfd assign/deassign  logic Cornelia Huck <cornelia.huck@de.ibm.com> - 2015-09-15 09:10 +0200
  [PATCH V6 3/6] kvm: fix double free for fast mmio eventfd Jason Wang <jasowang@redhat.com> - 2015-09-15 08:50 +0200
    Re: [PATCH V6 3/6] kvm: fix double free for fast mmio eventfd Cornelia Huck <cornelia.huck@de.ibm.com> - 2015-09-15 09:20 +0200
  Re: [PATCH V6 0/6] Fast mmio eventfd fixes Paolo Bonzini <pbonzini@redhat.com> - 2015-09-15 17:10 +0200
    Re: [PATCH V6 0/6] Fast mmio eventfd fixes "Michael S. Tsirkin" <mst@redhat.com> - 2015-09-15 21:30 +0200
      Re: [PATCH V6 0/6] Fast mmio eventfd fixes Paolo Bonzini <pbonzini@redhat.com> - 2015-09-16 11:10 +0200

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