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Re: [Qemu-devel] Hitting 29 NIC limit


From: Anthony Liguori
Subject: Re: [Qemu-devel] Hitting 29 NIC limit
Date: Thu, 14 Oct 2010 17:17:36 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.12) Gecko/20100915 Lightning/1.0b1 Thunderbird/3.0.8

On 10/14/2010 05:12 PM, Anjali Kulkarni wrote:
Thanks. Does this work for e1000 as well?

Haven't tried.  I don't know how various e1000 drivers would react.

Also, does it support pci hotplug?

No, but that's fixable down the road.

Regards,

Anthony Liguori

Anjali

On 10/14/10 3:09 PM, "Anthony Liguori"<address@hidden>  wrote:

On 10/14/2010 05:00 PM, Anjali Kulkarni wrote:
Can you send me pointers to the qdev documentation? How can I use it? Will
it allow us to scale above the 32 PCI limit?

It's all below.  You just have to create a PCI device and mark the
multifunction flag to on and then assign it a PCI address that includes
a function number.  Then you can pack 8 virtio PCI devices into a single
slot.

Regards,

Anthony Liguori

Anjali


On 10/14/10 2:57 PM, "Anthony Liguori"<address@hidden>   wrote:


On 10/14/2010 04:42 PM, Richard W.M. Jones wrote:

On Thu, Oct 14, 2010 at 01:10:47PM +0100, Daniel P. Berrange wrote:


Or a PCI bridge to wire up more PCI buses, so we raise the max limit for
any type of device we emulate.


Break the 29/30/31 virtio-blk limit ... please!


It was broken ages ago:

address@hidden:~$ wc -l /proc/partitions; tail /proc/partitions
422 /proc/partitions
    251     1618          1 vdcx2
    251     1621     489951 vdcx5
    251     1632   10485760 vdcy
    251     1633    9992398 vdcy1
    251     1634          1 vdcy2
    251     1637     489951 vdcy5
    251     1648   10485760 vdcz
    251     1649    9992398 vdcz1
    251     1650          1 vdcz2
    251     1653     489951 vdcz5

This is what makes qdev so useful.

args=""
for slot in 5 6 7 8 9 10 11 12 13 14 15 16 17; do
for fn in 0 1 2 3 4 5 6 7; do
       args="$args -drive

file=/home/anthony/images/linux.img,if=none,snapshot=on,id=disk${slot}_${fn}>>>
"
       args="$args -device
virtio-blk-pci,addr=${slot}.${fn},drive=disk${slot}_${fn},multifunction=on"
done
done

x86_64-softmmu/qemu-system-x86_64 -hda ~/images/linux.img ${args}
-enable-kvm -serial stdio

Regards,

Anthony Liguori


Rich.



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