From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 42636] PCI passthrough does not work with AMD iommu for PCI
device
Date: Fri, 30 Mar 2012 12:16:39 GMT
Message-ID: <201203301216.q2UCGdbt025907@bugzilla.kernel.org>
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--- Comment #7 from Klaus Mueller 2012-03-30 12:16:39 ---
Thanks,
with the "iommu=pt iommu=1" options applied it doesn't work at all - even the
"workaround" with first try to start with the bridge applied and afterwards
without the bridge added isn't working then.
BTW: I can pass through PCIe devices, as long as they have different PCI ids
and different modules, without any problem.
I'm using the option allow_unsafe_assigned_interrupts=1 already!
I think there is a problem with the handling of the device behind a PCI bridge,
which should be fixed (-> the Ralink device which should be passed through is a
PCI device and not a PCIe device)! Take a look at the qemu-kvm crash log
https://bugzilla.kernel.org/attachment.cgi?id=72753
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