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Re: [Xen-users] ucode=-1: did anybody have success?

CCing Konrad who I think knows how all this stuff goes...

On Mon, 2014-05-05 at 10:52 +0300, Sven KÃhler wrote:
> Hi,
> did anybody use Xen's ucode option successfully?
> I'm trying to update the microcode before dom0 starts, since my dom0
> doesn't have the xen microcode driver. I'm using a vanilla 3.12.x kernel
> from kernel.org and to the best of my knowledge, the xen microcode
> kernel driver didn't make it upstream yet, i.e., it's only in konrad's tree.
> So I probably want ucode=-1. The documentation is speaking of a CPU
> microcode update BLOB. So all I need is to make the microcode BLOB the
> last module in grub, right? But: BLOB in which format?
> Well, on my system the microcode exists in two formats:
> - /lib/firmware/microcode.dat (not sure what the format is, it's
> definitely not cpio based, as would be needed for ucode=scan)
> - many single files in /lib/firmware/intel-ucode/
> Which line in grub would be correct? I guess it isn't
>   module /lib/firmware/microcode.dat
> or
>   module /lib/firmware/intel-ucode/<somefile>
> by any chance?
> Now the documentation of ucode goes one to talk to about some file
> called kernel/x86/microcode/GenuineIntel.bin. But it only talks about it
> in combination with ucode=scan. A wild guess could be, that this file is
> identical to microcode.dat. Another wild guess could be, that this file
> is something I have to download from intel, and this is also the file I
> have to use as a module in case I'm using ucode=-1 instead of ucode=-1.
> So could somebody who did all the research and experimenting show his
> working configuration to me?
> I think I tried microcode.dat once, and it didn't seem to work.
> I haven't tried a file from /lib/firmware/intel-ucode/ as I only have
> one production system and my test system is a VM where microcode updates
> are not possible.
> Regards,
>   Sven
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