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qemu: multiqueue for ccw devices

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Allow ccw devices to be used with multiqueues. ccw provides a one to
one relation of fds to queues and does not support the vectors option.

Signed-off-by: Boris Fiuczynski <fiuczy@linux.vnet.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Reviewed-by: Daniel Hansel <daniel.hansel@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Boris Fiuczynski 2015-05-06 16:07:40 +02:00 committed by Laine Stump
parent b8e60f00d8
commit 808e771e83
1 changed files with 11 additions and 3 deletions
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14
src/qemu/qemu_command.c
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@ -5129,9 +5129,17 @@ qemuBuildNicDevStr(virDomainDefPtr def,
}
}
if (usingVirtio && vhostfdSize > 1) {
/* As advised at http://www.linux-kvm.org/page/Multiqueue
* we should add vectors=2*N+2 where N is the vhostfdSize */
virBufferAsprintf(&buf, ",mq=on,vectors=%zu", 2 * vhostfdSize + 2);
if (net->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) {
/* ccw provides a one to one relation of fds to queues and
* does not support the vectors option
*/
virBufferAddLit(&buf, ",mq=on");
} else {
/* As advised at http://www.linux-kvm.org/page/Multiqueue
* we should add vectors=2*N+2 where N is the vhostfdSize
*/
virBufferAsprintf(&buf, ",mq=on,vectors=%zu", 2 * vhostfdSize + 2);
}
}
if (vlan == -1)
virBufferAsprintf(&buf, ",netdev=host%s", net->info.alias);