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qemu: Support multiple queue virtio-scsi

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This introduce a new attribute "num_queues" (same with the good name
QEMU uses) for virtio-scsi controller. An example of the XML:

<controller type='scsi' index='0' model='virtio-scsi' num_queues='8'/>

The corresponding QEMU command line:

-device virtio-scsi-pci,id=scsi0,num_queues=8,bus=pci.0,addr=0x3 \
This commit is contained in:
Osier Yang
2013-04-06 00:21:23 +08:00
parent 5899e09e61
commit d4bf0a9378
9 changed files with 79 additions and 7 deletions
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18
docs/formatdomain.html.in
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@@ -2092,13 +2092,17 @@
controller. A "scsi" controller has an optional
attribute <code>model</code>, which is one of "auto", "buslogic",
"ibmvscsi", "lsilogic", "lsisas1068", "lsisas1078", "virtio-scsi" or
"vmpvscsi". A "usb" controller has an optional attribute
<code>model</code>, which is one of "piix3-uhci", "piix4-uhci", "ehci",
"ich9-ehci1", "ich9-uhci1", "ich9-uhci2", "ich9-uhci3",
"vt82c686b-uhci", "pci-ohci" or "nec-xhci". Additionally,
<span class="since">since 0.10.0</span>, if the USB bus needs to be
explicitly disabled for the guest, <code>model='none'</code> may be used.
The PowerPC64 "spapr-vio" addresses do not have an associated controller.
"vmpvscsi". The attribute <code>num_queues</code>
(<span class="since">1.0.5 (QEMU and KVM only)</span>) specifies
the number of queues for the controller. For best performance, it's
recommended to specify a value matching the number of vCPUs. A "usb"
controller has an optional attribute <code>model</code>, which is one
of "piix3-uhci", "piix4-uhci", "ehci", "ich9-ehci1", "ich9-uhci1",
"ich9-uhci2", "ich9-uhci3", "vt82c686b-uhci", "pci-ohci" or "nec-xhci".
Additionally, <span class="since">since 0.10.0</span>, if the USB bus
needs to be explicitly disabled for the guest, <code>model='none'</code>
may be used. The PowerPC64 "spapr-vio" addresses do not have an
associated controller.
</p>
<p>

5
docs/schemas/domaincommon.rng
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@@ -1426,6 +1426,11 @@
</choice>
</attribute>
</optional>
<optional>
<attribute name="num_queues">
<ref name="unsignedInt"/>
</attribute>
</optional>
<optional>
<ref name="usbmaster"/>
</optional>