[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Current state of Xen microcode (Was: Re: uploading 3.16~rc5-1~exp1)
On Tue, 2014-07-15 at 11:35 -0400, Konrad Rzeszutek Wilk wrote: > On Tue, Jul 15, 2014 at 04:06:00PM +0100, Ian Campbell wrote: > > On Tue, 2014-07-15 at 10:59 -0400, Konrad Rzeszutek Wilk 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/features/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/misc > > > > > > 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'. > > > > Hrm, I thought it was transparent. Debian doesn't use dracut, it uses > > initramfs-tools. So perhaps there is some work to be done here. > > > > I understand ucode=scan, but what does the dracut option do? > > Packages the blobs and sticks them to the initramfs. > > I think 'initframfs-tools' will need some code there. [...] initramfs-tools can already prepend microcode in the way Linux expects. I assume Xen supports the same format (it's a little weird for it to be parsing the dom0 initrd, but OK...). But we're presumably missing the GRUB integration to get 'ucode=scan' added automatically. Ben. -- Ben Hutchings Hoare's Law of Large Problems: Inside every large problem is a small problem struggling to get out. Attachment:
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