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[solved] Problems assigning HW to VMs with PCI-Passthrough
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tuner23
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Joined: 18 May 2006
Posts: 68

PostPosted: Sat Jun 04, 2011 7:08 pm    Post subject: [solved] Problems assigning HW to VMs with PCI-Passthrough Reply with quote

Hy,

i have some problems assigning two network-cards on to different VMs with kvm.

What i do:
1. Remapping the devices:
Code:
 #!/bin/bash
##

## 06:02.0 Ethernet controller: D-Link System Inc DGE-528T Gigabit Ethernet Adapter (rev 10)
## 06:02.0 0200: 1186:4300 (rev 10)
## 06:03.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
## 06:03.0 0200: 10ec:8139 (rev 10)

## External interface
echo "10ec 8139" > /sys/bus/pci/drivers/pci-stub/new_id
echo "0000:06:03.0" > /sys/bus/pci/devices/0000:06:03.0/driver/unbind
echo "0000:06:03.0" > /sys/bus/pci/drivers/pci-stub/bind
echo "10ec 8139" > /sys/bus/pci/drivers/pci-stub/remove_id

## Internal interface
echo "1186 4300" > /sys/bus/pci/drivers/pci-stub/new_id
echo "0000:06:02.0" > /sys/bus/pci/devices/0000:06:02.0/driver/unbind
echo "0000:06:02.0" > /sys/bus/pci/drivers/pci-stub/bind
echo "1186 4300" > /sys/bus/pci/drivers/pci-stub/remove_id


2. Starting the VMs
Code:
# qemu-kvm -enable-kvm -drive file=/vms/prod/fw/fw.iso,if=virtio,boot=on -m 512 -smp 1 -curses -kernel /data/kernels/vmlinuz-2.6.36-gentoo-r8 -append "root=/dev/vda" -net nic,model=virtio,macaddr=DE:AD:DE:EF:2D:AD -net tap,ifname=tapfw0,script=/etc/qemu/qemu-ifup -device pci-assign,host=06:03.0
# qemu-kvm -enable-kvm -drive file=/vms/prod/res/res.iso,if=virtio,boot=on -m 512 -smp 1 -curses -kernel /data/kernels/vmlinuz-2.6.36-gentoo-r8 -append "root=/dev/vda" -net nic,model=virtio,macaddr=DE:AD:DE:EF:2D:AE -net tap,ifname=tapres0,script=/etc/qemu/qemu-ifup -device pci-assign,host=06:02.0


When i boot only one of them every network card works.
Every time i boot both, one of them is disabled (the one i booted first).

What is the problem here? I don't think that i can only assign devices to one virtual machine..

When i do a ping on the machine where the network doesn't work anymore, i get the following output on the other:
Code:
                   res ~ # tcpdump -i eth0                                                                           
                  tcpdump: verbose output suppressed, use -v or -vv for full protocol decode                       
                  listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes                             
                  23:01:39.432173 00:00:00:00:00:00 (oui Ethernet) > 49:4e:81:a4:02:02 (oui Unknown) Null Information, send seq 0, rcv seq 0, Flags [Command], length 84                           
...


Some data:
Code:
         moffat bin # cat /proc/interrupts
           CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       
  0:     533162          0          0          0          0          0          0          0   IO-APIC-edge      timer
  1:         64          0          0          0          0          0          0          0   IO-APIC-edge      i8042
  4:         10          0          0          0          0          0          0          0   IO-APIC-edge      serial
  8:         79          0          0          0          0          0          0          0   IO-APIC-edge      rtc0
  9:          0          0          0          0          0          0          0          0   IO-APIC-fasteoi   acpi
 16:         26          0          0          0          0          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb1
 21:       2783          0          0          0          0          0          0          0   IO-APIC-fasteoi   kvm:0000:06:02.0
 22:       5165          0          0          0          0          0          0          0   IO-APIC-fasteoi   kvm:0000:06:03.0
 23:        122          0          0          0          0          0          0          0   IO-APIC-fasteoi   ehci_hcd:usb2


Code:
   moffat bin # cat /proc/ioports
0000-0cf7 : PCI Bus 0000:00
...
        e000-efff : PCI Bus 0000:06
    e080-e0ff : 0000:06:05.0
    e400-e4ff : 0000:06:03.0
      e400-e4ff : kvm_assigned_device
    e800-e8ff : 0000:06:02.0
      e800-e8ff : kvm_assigned_device


Code:
moffat bin # cat /proc/dma
 4: cascade


Have someone an idea what i am doing wrong in this case?


Thx in advance,
Antonios.


Last edited by tuner23 on Mon Jun 13, 2011 5:21 pm; edited 1 time in total
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tuner23
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Joined: 18 May 2006
Posts: 68

PostPosted: Mon Jun 13, 2011 5:20 pm    Post subject: Reply with quote

Ok,

the problem is that i can not passthrough PCI-slots, to multiple virtual machines when i have not a Mainboard with PCI-express and the cards are not PCI-express.
It's defined in the specification of VT-d.

Now with (new) PCIe-cards it works.


greets.
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