On 10/05/2019 16:17, Mathieu Tarral wrote: > Le jeudi, mai 9, 2019 6:42 PM, Andrew Cooper <andrew.coop...@citrix.com> 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..."
That is actually a Xen bug where we don't scan the current microcode version if we aren't about to load new microcode. Therefore, it was likely a red herring before. I'll try and get a fix sorted properly and tagged for backport. > 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. Good - that is one further angle excluded. Always make sure you are running with up-to-date microcode, but it looks like we back to investigating a logical bug in libvmi or Xen. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
