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paradigm-X
Apprentice
Joined: 19 Sep 2013
Posts: 168
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 Posted: Tue Dec 17, 2013 1:05 am Post subject: PCI passthrough |
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| Do I understand correctly that it would not be possible for a KVM/Qemu guest to make use of a PCI device from the host machine unless VT-d is supported by the CPU of the physical machine, assuming an Intel CPU? |
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Mad Merlin
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Joined: 09 May 2005
Posts: 1155
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| Posted: Thu Dec 19, 2013 6:53 pm Post subject: |
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Yes, you need VT-d support on the CPU and more importantly also on the motherboard. While most modern CPUs support VT-d (the notable exception being the k series chips such as the 4770k), many modern motherboards still lack VT-d support.
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fpemud
Guru
Joined: 15 Feb 2012
Posts: 352
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| Posted: Fri Dec 20, 2013 2:32 am Post subject: |
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Is there any way to test if a mother board fully supports VT-d, WITHOUT a VT-d capable CPU?
I bought the wrong CPU model, which is i5-2500K.
I'm considering to change it to i5-2500 perhaps.
And my mother board is MSI-Z68A-G43 (B3).
Although it says VT-d support in the spec document, but it's not on the IOMMU supporting hardware list.
I want to be certain with my board before the CPU change. |
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Anon-E-moose
Watchman
Joined: 23 May 2008
Posts: 6208
Location: Dallas area
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| Posted: Fri Dec 20, 2013 9:58 am Post subject: |
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| fpemud wrote: | And my mother board is MSI-Z68A-G43 (B3).
Although it says VT-d support in the spec document, but it's not on the IOMMU supporting hardware list. |
If there isn't a bios switch for iommu then it probably isn't supported (complete implementation) on the motherboard,
I swapped out my old MSI one for an ASUS one for that very reason.
What does "grep -i iommu /var/log/dmesg" report?
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UM780, 6.12 zen kernel, gcc 13, openrc, wayland |
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Kernel & Hardware
