I'm trying to pass-through my VGA card to a guest session. I found: http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM - which is very frustrating because there's no date on the documentation. I suspect it's old. It does clearly say that you must have VT-d support for pci pass-through. It then goes on to say "Some work towards allowing this ["software pass-through"] were done, but the code never made it into KVM". If this is old is there now support for PCI pass-through on hardware that doesn't support VT-d?
I have a HP p7-1456c which has: Intel Core i5-3330 Processor (VT-x=yes, VT-d=yes) http://ark.intel.com/products/65509/Intel-Core-i5-3330-Processor-6M-Cache-up-to-3_20-GHz on a MB: H-Joshua-H61-UATX (with specs that say *nothing* about virtualization) http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c03135925#N98 and the H-Joshua-H61-UATX uses the Intel H61 Express Chipset (VT-d=No) http://ark.intel.com/products/52806/Intel-BD82H61-PCH?q=intel%20h61%20express%20chipset On the KVM how to assign devices page it provides a way to verify IOMMU support on Intel: ]# dmesg | grep -e DMAR -e IOMMU [ 0.000000] ACPI: DMAR 00000000d8d29460 000B0 (v01 HPQOEM SLIC-CPC 00000001 INTL 00000001) [ 0.023074] dmar: IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c0000020e60262 ecap f0101a [ 0.023078] dmar: IOMMU 1: reg_base_addr fed91000 ver 1:0 cap c9008020660262 ecap f0105a [ 0.023151] IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1 Does this mean I do have VT-d/IOMMU support??? I attempted to follow the basic instructions to pass through my VGA card: ]$ lspci -nn | grep VGA 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) Then added to my domain definition: <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> </hostdev> With that added code I consistently get "Connection to guest failed" messages and the guest fails to start. /var/log/libvirt/qemu is empty. No log. So my 1st question is can I do this given my hardware? If the answer is "yes" then this is where I'm stuck. Additionally, I tried: ]$ virsh nodedev-detach pci_0000_00_02_0 error: Failed to detach device pci_0000_00_02_0 error: Failed to add PCI device ID '8086 0152' to pci-stub: Permission denied My thinking was simply to verify if I could manually detach the device. I couldn't find a reference searching for this error. Any help would be greatly appreciated! Thank you!
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