From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 42635] New: PCIe passthrough broken with AMD iommu after s2disk
 / resume
Date: Mon, 23 Jan 2012 09:35:19 GMT
Message-ID: <bug-42635-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=42635

           Summary: PCIe passthrough broken with AMD iommu after s2disk /
                    resume
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@kernel-bugs.osdl.org
        ReportedBy: kmueller@justmail.de
        Regression: No


A PCIe ethernet device is passed through to the guest and runs fine. Some time
later, the guest is shutdown (e.g. virsh shutdown guest) and the host is
suspended (s2disk) and resumed again. The guest is started again (and it starts
fine), but the device in the guest isn't working any more (it can be seen, it
can be pinged itself but nothing is reachable outside the device. The rx or tx
counters of the ifconfig output are always 0.

If the guest is shutdown and the device is bound to the host, it's working as
expected. If the device is afterwards bound to the guest again, it doesn't work
as before in the guest after resume.

kernel: 3.1 / 64bit / smp
kvm: 1.0
board: GA-990XA-UD3

If you need more information, I can provide them - feel free to ask!


Regards,
Klaus

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