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ambad4u
n00b
Joined: 08 May 2008
Posts: 59
Location: Toledo City, Cebu, Philippines
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 Posted: Thu Oct 22, 2015 11:20 am Post subject: yet another pci/pci-e kvm passthrough question |
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Greetings to everyone!,
its been a while 
anyways, I'm setting up a gentoo box that will host VM's via KVM/Qemu.
host details:
-Intel XEON E5520 http://ark.intel.com/products/40200/Intel-Xeon-Processor-E5520-8M-Cache-2_26-GHz-5_86-GTs-Intel-QPI
-Intel DX58S0 motherboard
-4GB RAM [at the moment]
what I'm trying to do is to passthrough a pci-e LAN/NIC but seems to fail.
I have read these for passthrough:
http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM
https://wiki.gentoo.org/wiki/QEMU/Options#PCI_pass-through
here is what I did:
| Code: | hypervisor ~ # qemu-system-x86_64 -enable-kvm -cpu host -net vde -net nic -m 512M -cdrom /home/qemu/systemrescuecd-x86-4.5.4.iso -vnc 192.168.1.65:1 -device kvm-pci-assign,host=00:30.0
qemu-system-x86_64: -device kvm-pci-assign,host=00:30.0: Property 'kvm-pci-assign.host' doesn't take value '00:30.0' |
I did try to follow it but no avail... 
tried also using virt-install..., and the result:
| Code: | hypervisor ~ # virt-install --name dualNIC --memory 512 --cpu host --vcpus 2 --virt-type kvm --hvm --nodisks --cdrom /home/qemu/systemrescuecd-x86-4.5.4.iso --host-device=pci_0000_03_00_0 --network network:default --graphics vnc
WARNING No operating system detected, VM performance may suffer. Specify an OS with --os-variant for optimal results.
Starting install...
ERROR internal error: early end of file from monitor: possible problem:
2015-10-22T10:48:33.690341Z qemu-system-x86_64: -device pci-assign,configfd=19,host=03:00.0,id=hostdev0,bus=pci.0,addr=0x4: Could not open '/sys/bus/pci/devices/0000:03:00.0/resource': Permission denied
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
virsh --connect qemu:///system start dualNIC
otherwise, please restart your installation. |
some info on the pci-e lan am trying to passthrough
| Code: | hypervisor ~ # lspci -nn | grep 03:00.0
03:00.0 Ethernet controller [0200]: Intel Corporation 82573L Gigabit Ethernet Controller [8086:109a] |
my emerge --info: https://bpaste.net/show/c1483b8b73e6
my kernel config: https://bpaste.net/show/4dfc31b49f65
dmesg if you need: https://bpaste.net/show/1337cde7626a
its been more than 2days already for me on this, any help is appreciated
thanks in advance! |
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hceline
n00b
Joined: 30 Aug 2015
Posts: 36
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| Posted: Thu Oct 22, 2015 9:36 pm Post subject: |
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Have you assigned the card to vfio-pci and booted with "iommu=on" or "iommu=pt"?
Edit: You seem to have switched the numbers here:
| Quote: | | qemu-system-x86_64: -device kvm-pci-assign,host=00:30.0: Property 'kvm-pci-assign.host' doesn't take value '00:30.0' |
00:30.0 should be 03:00.0 as below
| Quote: | 03:00.0 Ethernet controller [0200]: Intel Corporation 82573L Gigabit Ethernet Controller [8086:109a]
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Edit 2:
The "Could not open '/sys/bus/pci/devices/0000:03:00.0/resource': Permission denied" error should go away if you start qemu as root. |
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ambad4u
n00b
Joined: 08 May 2008
Posts: 59
Location: Toledo City, Cebu, Philippines
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| Posted: Fri Oct 23, 2015 1:44 pm Post subject: |
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I seem to have resolved it.
as hceline also pointed out, it needs a boot option of "intel_iommu=on" [for intel]
afterwards, you need to unbind the needed device [like below for example]:
| Code: | root #echo "8086 284b" > /sys/bus/pci/drivers/pci-stub/new_id
root #echo "0000:00:1b.0" > /sys/bus/pci/devices/0000:00:1b.0/driver/unbind
root #echo "0000:00:1b.0" > /sys/bus/pci/drivers/pci-stub/bind |
and then enable this if it complains something like: "No interrupt remapping support...."
execute this also:
| Code: | | echo 1 > /sys/module/kvm/parameters/allow_unsafe_assigned_interrupts |
pci passthru seems to be working and am happy ATM
thanks to all! |
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TigerJr
Guru
Joined: 19 Jun 2007
Posts: 540
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| Posted: Sat Oct 24, 2015 1:03 pm Post subject: |
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| Quote: | [ 0.015908] This system BIOS has enabled interrupt remapping
on a chipset that contains an erratum making that
feature unstable. To maintain system stability
interrupt remapping is being disabled. Please
contact your BIOS vendor for an update |
I found this message in your dmesg. Maybe this message helps you to understand USB\PCI Passthrough needs.
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Do not use gentoo, it die |
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