On Wed, Jul 23, 2014 at 03:59:37PM +0100, Jan Beulich wrote: > >>> On 15.07.14 at 16:59, <konrad.w...@oracle.com> wrote: > > On Tue, Jul 15, 2014 at 09:53:32AM +0100, Ian Campbell wrote: > >> Adding xen-devel and some of the Linux maints, > >> > >> On Mon, 2014-07-14 at 23:22 +0200, maximilian attems wrote: > >> > I will upload tomorrow Tuesday around 22h00 UT to experimental. > >> > > >> > There are two TODOS concerning the not yet forwarded Debian patches: > >> > - cgroups > >> > - xen microcode > >> > > >> > > >> > I consider both not a blocker, but would be happy if Xen guys could > >> > have a look for what is needed. > >> > >> The xen microcode patches which maks is referring to are these: > >> > > http://anonscm.debian.org/viewvc/kernel/dists/trunk/linux/debian/patches/feat > > > > ures/all/xen/ > >> which are a forward port of Jeremy's old microcode_xen.ko driver. > > > > They are also at my branch > > http://git.kernel.org/cgit/linux/kernel/git/konrad/xen.git/log/?h=stable/mis > > > > c > > > > Hm, I should rebase them at some point. > >> > >> I've not been keeping up on Xen x86 microcode stuff these days but I > >> think we don't need this any more with modern Xen since we can parse the > >> microcode blob off the front of the initrd, is that right? > > > > Right. And best of it, the support for that is in dracut so > > it automatically can happen (thought you still need to add > > 'ucode=scan' in the /etc/default/grub.cfg in the GRUB_CMDLINE_XEN > > parameter) and also in /etc/dracut.conf add 'early_microcode=yes'. > > Except that all this still doesn't take care of updating microcode at > runtime. Yet that should - like kexec - be implemented in the > respective tools such that no kernel involvement it required.
What are such tools? My recollection is that it is matter of sticking the files in /lib/firmware and then udev - will try at the detection of an CPU becoming online, do: - load microcode module - echo 1 > to the 'reload' sysfs parameter Perhaps the solution is simple: - write an xen userspace tool that will do this loading via the hypercalls. - plug said tool in the udev script that comes with xen. - distros will install said udev scripts when they install Xen rpms? That sounds too simple to be true. I must be missing something :-) > > Jan > -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/20140804140730.gd18...@laptop.dumpdata.com
