[Bug 90037] [xen iommu] After upgrading to Linux 3.19, desktop no longer works in Xen 4.5.0 dom0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90037

Ting-Wei Lan <lantw44 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED
           Assignee|intel-gfx-bugs at lists.freede |lantw44 at gmail.com
                   |sktop.org                   |

--- Comment #25 from Ting-Wei Lan <lantw44 at gmail.com> ---
Created attachment 141536
  --> https://bugs.freedesktop.org/attachment.cgi?id=141536&action=edit
dmesg (Xen 4.10.1 + Linux 4.19.0-rc2+) #2

This is the log from the test of the second time. After the first test, I
rebooted the system with 'iommu=no-igfx' set on Xen command line and hoped it
could boot normally. However, it stopped and dropped into a shell in initramfs
because the fsck on rootfs failed. I manually performed fsck and the system
seemed to boot up normally to the desktop. I assumed all filesystem troubles
caused by the previous test were now cleaned up, and I rebooted the system to
do the second test.

This time I remebered to add 'ucode=-1' to Xen command line to let it load
Intel CPU microcode update. The version of the microcode update file is
'revision 0x11, date = 2018-05-08'. The kernel printed a lot of repeated
messages in this test and the log quickly grew over 30M. I reset the system
from Xen once I saw it printed messages endlessly. Because of the large file
size, I only uploaded the first 20000 lines of the log here.

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