[Pkg-xen-devel] Bug#785187: Bug#785187: xen-hypervisor-4.5-amd64: Option ucode=scan is not working

[Ian Campbell]

I think I remember some discussion of something in this area not too
long ago on xen-devel. CC-s added.

Konrad, do you know of any issues with ucode=scan in 4.4? 

On Wed, 2015-05-13 at 10:27 +0200, Stephan Seitz wrote:
> Package: xen-hypervisor-4.5-amd64
> Version: 4.5.0-1
> Severity: normal
> 
> Dear Maintainer,
> 
> according to the documentation the option ucode=scan should tell XEN to 
> look for a microcode update in an uncompressed initrd.
> 
> While I don’t use the Debian kernel the tools to generate the initrd are 
> part of Debian. The command „cpio -i < /boot/initrd.img-4.0.2-Dom0” 
> creates the directory structure „kernel/x86/microcode/GenuineIntel.bin”, 
> so I think the initrd is allright.
> 
> But according to /proc/cpuinfo the microcode update doesn’t happen. If 
> I copy GenuineIntel.bin to /boot, create a new module section in grub.cfg 
> and boot with ucode=-1, then the update is working. In both cases dmesg 
> or „xl dmesg” don’t tell anything about microcode updates (successfull or 
> not).
> 
> The option ucode=scan doesn’t work with XEN 4.4 either or with 3.6 
> kernels.
> 
> -- System Information:
> Debian Release: stretch/sid
>   APT prefers oldoldstable-updates
>   APT policy: (500, 'oldoldstable-updates'), (500, 'testing'), (500, 'stable')
> Architecture: amd64 (x86_64)
> Foreign Architectures: i386
> 
> Kernel: Linux 4.0.2-Dom0 (SMP w/8 CPU cores)
> Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /bin/dash
> Init: sysvinit (via /sbin/init)
> 
> xen-hypervisor-4.5-amd64 depends on no packages.
> 
> Versions of packages xen-hypervisor-4.5-amd64 recommends:
> ii  xen-utils-4.5  4.5.0-1
> 
> xen-hypervisor-4.5-amd64 suggests no packages.
> 
> -- no debconf information
> 
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