[pve-devel] pci slot assignment proposal (hotplug requirement)

Alexandre DERUMIER aderumier at odiso.com
Fri Aug 26 12:40:08 CEST 2011

> - can we add more that one pci controller? 

Maybe I was not clear, but yes of course.

for scsi :
- we can add x scsi controller with on each controller 7 disk.

for virtio disk:

we need to add 1 virtio controller for 1 virtio disk.

(i see a recent patch for use more than 1 virtio by virtio controller, but i don't think it's already in main trunk)

what type of pci controller do you want add ?

> - can we have pci bridges? 

what do you mean by bridges ?

basicly, first device in qemu is the brige (host bridge,isa bridge,ide controller,usb controller).
This is the default in qemu.
(just make a info pci in qemu monitor)

> - what device types do you want to hotplug (usage scenario)? 

virtio nic and virtio disks.

some usages exemples:

disks: you have a server, you want to add space by adding a new disk. I don't want to reboot to add disk.
nics : you wan't to change vlan, simply hotplug network card and replug a new one on other vlan.
many other usages...

I'm already doing it on linux,win2003,win2008. it's very stable.

some qemu exemple (from qemu mailing list)

  -M pc-0.11
  -m 214
  -smp 1

  -name everything
  -uuid c7a1edbd-edaf-9455-926a-d65c36db1809


  -mon chardev=monitor,mode=readline

  -boot c
  -kernel /home/berrange/vmlinuz-PAE
  -initrd /home/berrange/initrd-PAE.img

  -device lsi,id=scsi0,addr=13
  -device lsi,id=scsi1,addr=14
  -device lsi,id=scsi2,addr=15
  -device lsi,id=scsi3,addr=16
  -device lsi,id=scsi4,addr=17

  -device virtio-blk-pci,addr=4,drive=drive-virtio-disk0,id=virtio-disk0

  -drive file=/home/berrange/gpxe.iso,if=none,media=cdrom,id=drive-ide0-1-0
  -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0

  -drive file=/home/berrange/output.img,if=none,id=drive-usb-disk1
  -device usb-storage,drive=drive-usb-disk1,id=usb-disk1

  -drive file=/home/berrange/output.img,if=none,id=drive-scsi0-0-0
  -device scsi-disk,bus=scsi0.0,scsi-id=0,drive=drive-scsi0-0-0,id=scsi0-0-0

  -drive file=/home/berrange/output.img,if=none,id=drive-scsi3-0-4
  -device scsi-disk,bus=scsi3.0,scsi-id=4,drive=drive-scsi3-0-4,id=scsi3-0-4

  -drive file=/home/berrange/output.img,if=none,id=drive-scsi4-0-3
  -device scsi-disk,bus=scsi4.0,scsi-id=3,drive=drive-scsi4-0-3,id=scsi4-0-3

  -netdev user,id=netdev0
  -device ne2k_pci,netdev=netdev0,id=ne2k_pci-nic0,mac=52:54:00:5b:ef:21,addr=5

  -netdev socket,mcast=,id=netdev1
  -device virtio-net-pci,netdev=netdev1,id=virtio-nic1,mac=52:54:00:1c:dc:98,addr=6

  -netdev tap,fd=21,id=netdev2
  -device e1000,netdev=netdev2,id=e1000-nic2,mac=52:54:00:f7:c5:0e,addr=7

  -netdev user,id=netdev3
  -device pcnet,netdev=netdev3,id=pcnet-nic3,mac=52:54:00:56:6c:55,addr=8

  -netdev user,id=netdev4
  -device rtl8139,netdev=netdev4,id=rtl8139-nic4,mac=52:54:00:ca:0d:58,addr=9

  -chardev pty,id=serial0
  -device isa-serial,chardev=serial0

  -chardev pty,id=parallel0
  -device isa-parallel,chardev=parallel0

  -device usb-tablet,id=input0

  -vga cirrus

  -device AC97,id=sound0,addr=10

  -device ES1370,id=sound1,addr=11

  -device i6300esb,id=watchdog0,addr=18
  -watchdog-action reset

  -device pci-assign,host=15:00.0,id=hostpci0,addr=12

  -device usb-host,hostbus=004,hostaddr=002,id=hostusb1 

----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com>, pve-devel at pve.proxmox.com 
Envoyé: Vendredi 26 Août 2011 12:21:16 
Objet: RE: [pve-devel] pci slot assignment proposal (hotplug requirement) 

> to make hotplug and livemigration works correctly, we need to fix pci slot 
> assignement of the devices and use new qemu --device syntax. 

I would like to clarify some related things first: 

- can we add more that one pci controller? 
- can we have pci bridges? 
- what device types do you want to hotplug (usage scenario)? 

- Dietmar 



	Alexandre Derumier 
Ingénieur système 
e-mail : aderumier at odiso.com 
Tél : +33 (0)3 20 68 88 90 
Fax : +33 (0)3 20 68 90 81 
45 Bvd du Général Leclerc 

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