** Changed in: linux (Ubuntu Lunar)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2020022
Title:
[SRU][22.04.2 & 23.10] OS cannot boot successfully when enabling VMD
in UEFI setup
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Kinetic:
Won't Fix
Status in linux source package in Lunar:
Fix Committed
Status in linux source package in Mantic:
Fix Released
Status in linux source package in Noble:
Fix Released
Bug description:
[Impact]
When enabling VMD in UEFI setup, OS cannot boot successfully. And, the panic
leads to the system reboot. The following log is shown:
[ 166.605518] DMAR: VT-d detected Invalidation Queue Error: Reason f
[ 166.605522] DMAR: VT-d detected Invalidation Time-out Error: SID ffff
[ 166.612445] DMAR: VT-d detected Invalidation Completion Error: SID ffff
[ 166.612447] DMAR: QI HEAD: UNKNOWN qw0 = 0x0, qw1 = 0x0
[ 166.612449] DMAR: QI PRIOR: UNKNOWN qw0 = 0x0, qw1 = 0x0
...
Additional info:
* The issue happens on both Lenovo SE350 server and Lenovo SR850 v2 server.
Debugging info and fix commit info:
* `git bisect` indicates the offending commit is 6aab5622296b ("PCI: vmd:
Clean up domain before enumeration"). The root cause is that VMD driver tries
to clear a PCI configuration space range when resetting a VMD domain
(https://github.com/torvalds/linux/blob/master/drivers/pci/controller/vmd.c#L544),
which leads to the failure.
[Fix]
* Another `git bisect` indicates the fix commit is 20f3337d350c ("x86:
don't use REP_GOOD or ERMS for small memory clearing). I confirmed that this
commit can fix the issue.
Would it be possible to include the commit 20f3337d350c in Ubuntu
22.04.2/23.10 kernel?
[Test Plan]
Reproduce Step
1.Disable Intel VMD in BIOS settings
System Settings --> Devices and I/O Ports --> Intel VMD technology -->
Enable/Disable Intel VMD : Disabled
2.Install OS
3.Enable Intel VMD in BIOS settings
System Settings --> Devices and I/O Ports --> Intel VMD technology -->
Enable/Disable Intel VMD : Enabled
4.Rebooting will reproduce this issue
[ Where problems could occur ]
* Lenovo SE350 server and Lenovo SR850 v2 server
* The regression leads to the boot failure (cannot boot info OS successfully).
[ Other Info ]
https://code.launchpad.net/~mreed8855/ubuntu/+source/linux/+git/lunar/+ref/enable_vmd_lp_2020022
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