[Pkg-xen-devel] Bug#901602: xen-system-amd64: AMD Epyc firmware bug, try to use APIC520

[Stefan Kadow]

Package: xen-system-amd64
Version: 4.8.3+xsa262+shim4.10.0+comet3-1+deb9u7
Severity: normal

journal log:
--cut--
installing Xen timer for CPU 1
[Firmware Bug]: cpu 1, try to use APIC520 (LVT offset 2) for vector
0xf4, but the register is already in use for vector 0x0 on this cpu
cpu 1 spinlock event irq 293
--cut--

I have installed Debian 9.4 Stretch (stable) with Xen Hypervisor 4.8
on a NUMA machine with two AMD Epyc processors. The machine is booting
in UEFI mode.

This warning message in journal log appears only when booting the
hypervisor kernel. It does not appear when booting the default kernel.

The machine has 32/64 cores/threads and the message appears 64 times.
When using the kernel parameter "dom0_max_vcpus=8 dom0_vcpus_pin" the
message appears only 8 times.


-- System Information:
Debian Release: 9.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.9.0-6-amd64 (SMP w/8 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages xen-system-amd64 depends on:
ii  xen-hypervisor-4.8-amd64  4.8.3+xsa262+shim4.10.0+comet3-1+deb9u7
ii  xen-utils-4.8             4.8.3+xsa262+shim4.10.0+comet3-1+deb9u7

xen-system-amd64 recommends no packages.

xen-system-amd64 suggests no packages.

-- no debconf information