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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, May 07, 2014 at 09:53:23AM +0100, Ian Campbell wrote:
> On Wed, 2014-05-07 at 09:34 +0100, Ian Campbell wrote:
> > CCing Konrad who I think knows how all this stuff goes...
> 
> FYO it seems like it got posted twice and there is a small thread on the
> other one at
> http://lists.xen.org/archives/html/xen-users/2014-05/msg00052.html
> 

To add that, you can do:

cat /lib/firmware/intel-ucode/* > /boot/microcode.bin

and use the GRUB stanza like 'Atom2' had mentioned.


> Ian.
> 
> > 
> > On Mon, 2014-05-05 at 10:52 +0300, Sven Köhler 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
> > > 
> > > 
> > > _______________________________________________
> > > Xen-users mailing list
> > > Xen-users@xxxxxxxxxxxxx
> > > http://lists.xen.org/xen-users
> > 
> > 
> > 
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-users
> 
> 

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