From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 42635] PCIe passthrough broken with AMD iommu after s2disk /
 resume
Date: Tue, 3 Apr 2012 07:27:43 GMT
Message-ID: <201204030727.q337Rhj0024852@bugzilla.kernel.org>
References: <bug-42635-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=42635





--- Comment #3 from Klaus Mueller <kmueller@justmail.de>  2012-04-03 07:27:43 ---
Meanwhile I detected, that using the boot option iommu=pt (or additional
iommu=1) shows the same problem (regardless of suspend/resume). If the VM is
started after the first virsh start / virsh shutdown cycle with virsh start
again, the device is dead in the VM. Host must be rebooted to get it working
again.

If the options iommu=pt (or additional iommu=1) are not used at all, the VM can
be restarted without any problem coming up.

1. Host booted w/ iommu=pt iommu=1
2. virsh start
3. virsh shutdown
4. virsh start
5. -> Passed through device in VM is dead.


1. Host booted w/o iommu=pt iommu=1
2. virsh start
3. virsh shutdown
4. virsh start
5. -> Passed through device in VM is fine.

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