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* Skylake: VT-d and other error messages
@ 2015-11-28 20:46 Eric Shelton
  2015-11-28 22:14 ` Andrew Cooper
                   ` (2 more replies)
  0 siblings, 3 replies; 13+ messages in thread
From: Eric Shelton @ 2015-11-28 20:46 UTC (permalink / raw)
  To: xen-devel, Yang Zhang, Kevin Tian, Keir Fraser, Jan Beulich,
	Andrew Cooper


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Looking through the output of 'xl dmesg' on a Skylake system (i5-6600K), I
found a number of error messages that I do not encounter on a Haswell-based
system.  I have tried two motherboards from different manufacturers, with
pretty much the same results.  Below are some of the unexpected messages:

Not enabling x2APIC (upon firmware request)
...
mwait-idle: does not run on family 6 model 94
...
[VT-D] iommu.c:875: iommu_fault_status: Primary Pending Fault
[VT-D] INTR-REMAP: Request device [0000:f0:1f.0] fault index 0, iommu reg =
ffff82c000201000
(on motherboard 1) [VT-D] INTR-REMAP: reason 22 - Present field in the IRTE
entry is clear
(on motherboard 2) [VT-D] INTR-REMAP: reason 25 - Blocked a compatibility
format interrupt request

This leads to a few questions:
1) Is there some reason x2APIC should not be enabled on Skylake?  What
consequence, if any, is there not having x2APIC enabled?
2) Should mwait-idle be available on Skylake?
3) What about the IOMMU errors on Skylake - are they a concern?

Thank you,
Eric

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^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2015-12-04 21:23 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-11-28 20:46 Skylake: VT-d and other error messages Eric Shelton
2015-11-28 22:14 ` Andrew Cooper
2015-12-02  2:34   ` Tian, Kevin
2015-12-02  2:51     ` Eric Shelton
2015-12-02  9:54       ` Andrew Cooper
2015-12-02 10:45       ` Jan Beulich
2015-12-02 15:04         ` Eric Shelton
2015-12-02 15:28           ` Jan Beulich
2015-12-02 15:37             ` Eric Shelton
2015-12-02 15:41               ` Jan Beulich
2015-12-04 21:23                 ` Eric Shelton
2015-12-02  8:47 ` Shuai Ruan
     [not found] ` <20151202084717.GA18791@shuai.ruan@linux.intel.com>
2015-12-02  9:07   ` Shuai Ruan

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