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Old 28th April 2012, 12:07 PM
Riotvan Offline
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Join Date: Apr 2012
Location: Netherlands
Posts: 8
linuxchrome
Virtualization issue

Hey guys , i have the following problem when trying to use pci-passthrough/vt-d with hardware that i have confirmed works with another distro and custom kernel(debian testing kernel 3.3.3). Being an arch guy i wanted something a bit less bleeding edge and have the intel_iommu/vt-d stuff built in, i have added intel_iommu=on to /etc/default/grub and then updated grub.

However when starting a vm using virt-manager and kvm i get the following error:

Code:
Error starting domain: internal error Process exited while reading console log output: char device redirected to /dev/pts/1
No IOMMU found.  Unable to assign device "hostdev0"
qemu-kvm: -device pci-assign,host=00:19.0,id=hostdev0,configfd=22,bus=pci.0,addr=0x3: Device 'pci-assign' could not be initialized
some more info:

Code:
grep -e DMAR -e IOMMU
[    0.000000] ACPI: DMAR 00000000dafdf000 000E8 (v01 INTEL      SNB  00000001 INTL 00000001)
[    0.000000] Intel-IOMMU: enabled
[    0.062384] DMAR: Host address width 36
[    0.062391] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.062406] IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c0000020e60262 ecap f0101a
[    0.062412] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.062424] IOMMU 1: reg_base_addr fed91000 ver 1:0 cap c9008020660262 ecap f0105a
[    0.062428] DMAR: RMRR base: 0x000000dacd5000 end: 0x000000dacebfff
[    0.062433] DMAR: RMRR base: 0x000000db800000 end: 0x000000df9fffff
[    0.062518] IOAPIC id 2 under DRHD base  0xfed91000 IOMMU 1
Code:
virsh nodedev-dettach pci_0000_00_19_0
Device pci_0000_00_19_0 detached
Maybe i'm missing something but i did the exact same thing under debian and it worked fine, the hardware is a Thinkpad X220 and i'm trying to passthrough the onboard NIC.
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