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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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

Ian.

> 
> 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
> > 
> > 
> > _______________________________________________
> > 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



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users