[Pkg-xen-devel] Bug#990717: xen-system-amd64: Microcode isn't loaded when booting in xen mode

Mon Jul 5 14:13:17 BST 2021

Package: xen-system-amd64
Version: 4.11.4+107-gef32c7afa2-1
Severity: important

Dear Maintainer,

When booting in Xen mode my system doen't load microcode, I suposse this is the reason I have a line in /var/log/kern.log saying:

|Jun 28 17:09:28 xuxa3 kernel: [    3.013020] Performance Events: unsupported p6 CPU model 79 no PMU driver, software events only

And perfomamce is degraded:

When booting the system in normal mode, no xen mode, the first two lines written in  /var/log/kern.log say:
| Jul  5 14:05:17 xuxa3 kernel: [    0.000000] microcode: microcode updated early to revision 0xb00003e, date = 202
1-02-06
| Jul  5 14:05:17 xuxa3 kernel: [    0.000000] Linux version 4.19.0-17-amd64 (debian-kernel at lists.debian.org) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 SMP Debian 4.19.194-1 (2021-06-10)

In xen mode the first line insn't written at all.

I can't remenber if the first time I installed xen the microcode was loaded or not, but as long as I can check the microcode isn't loaded and the system performance is clearly degraded.

  Yours,

    Jose L.

-- System Information:
Debian Release: 10.10
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-17-amd64 (SMP w/8 CPU cores)
Locale: LANG=es_ES.UTF-8, LC_CTYPE=es_ES.UTF-8 (charmap=UTF-8), LANGUAGE=es_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages xen-system-amd64 depends on:
ii  xen-hypervisor-4.11-amd64  4.11.4+107-gef32c7afa2-1
ii  xen-hypervisor-common      4.11.4+107-gef32c7afa2-1
ii  xen-utils-4.11             4.11.4+107-gef32c7afa2-1

xen-system-amd64 recommends no packages.

xen-system-amd64 suggests no packages.

-- no debconf information