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

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Message-ID: <55F84B99.7020903@redhat.com>
Date:	Tue, 15 Sep 2015 18:47:21 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Cornelia Huck <cornelia.huck@...ibm.com>
Cc:	Jason Wang <jasowang@...hat.com>, gleb@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mst@...hat.com
Subject: Re: [PATCH V6 6/6] kvm: add fast mmio capabilitiy



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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