Re: [Xen-devel] [VMI] Possible race-condition in altp2m APIs

[Mathieu Tarral <mathieu.tarral@xxxxxxxxxxxxxx>]

Le jeudi, mai 9, 2019 6:42 PM, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> a 
écrit :
> Therefore, the conclusion to draw is that it is a logical bug somewhere.
>
> First of all - ensure you are using up-to-date microcode.  The number of
> errata which have been discovered by people associated with the Xen
> community is large.
>
> The microcode is available from
> https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/ and
> https://andrewcoop-xen.readthedocs.io/en/latest/admin-guide/microcode-loading.html
> is some documentation I prepared earlier.
I updated my microcode following your instructions.
I installed the intel-microcode package on Debian stretch, and added ucode=scan 
to my Xen boot command line.

Looking at xl dmesg before the update, I noticed I had a bug that should be fix 
by a microcode update:
"tsc_deadline disabled due to errata..."
This message disappeared with the microcode code update, which is applied at 
boot and can be
seen in xl dmesg.
The microcode version is now 0x25 (2018-04-02)

And if I use iucode-tool on the intel-ucode directory, from the repo your 
provided, the only
microcode that matches has the same release date:

$ iucode-tool -S Intel-Linux-Processor-Microcode-Data-Files/intel-ucode/ -l
selected microcodes:
  053/001: sig 0x000306c3, pf_mask 0x32, 2018-04-02, rev 0x0025, size 23552


The bug is still here, so we can exclude a microcode issue.

Mathieu


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