Messages in this thread | | | From | Ross Philipson <> | Subject | RE: [Xen-devel] v3.9 - CPU hotplug and microcode earlier loading hits a mutex deadlock (x86_cpu_hotplug_driver_mutex) | Date | Wed, 8 May 2013 15:41:49 +0000 |
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> -----Original Message----- > From: xen-devel-bounces@lists.xen.org [mailto:xen-devel- > bounces@lists.xen.org] On Behalf Of Borislav Petkov > Sent: Wednesday, May 08, 2013 7:30 AM > To: Konrad Rzeszutek Wilk > Cc: fenghua.yu@intel.com; xen-devel@lists.xensource.com; x86@kernel.org; > linux-kernel@vger.kernel.org; mingo@redhat.com; hpa@zytor.com; > tglx@linutronix.de > Subject: Re: [Xen-devel] v3.9 - CPU hotplug and microcode earlier > loading hits a mutex deadlock (x86_cpu_hotplug_driver_mutex) > > On Wed, May 08, 2013 at 10:03:42AM -0400, Konrad Rzeszutek Wilk wrote: > > [ … snip some funky BIOS code ] > > > [here it shifts and continues on testing each CPU bit] > > > > > Questions over questions...? > > > > I probably went overboard with my answers :-) > > Konrad, you're killing me! :-) You actually went and looked at the > BIOS disassembly voluntarily. You must be insane, I think you should > immediately go to the doctor now for a thorough checkup. :-) > > I think I know who I can sling BIOS issues now to. > > > > Looks like save_mc_for_early would need another, local mutex to fix > that. > > > > Let me try that. Thanks for the suggestion. > > Ok, seriously now: yeah, this was just an idea, it should at least get > the nesting out of the way. > > About the BIOS deal: you're probably staring at some BIOS out there > but is this the way that it is actually going to be implemented on > the physical hotplug BIOS? I mean, I've only heard rumors about IVB > supporting physical hotplug but do you even have access to such BIOS to > verify?
The ASL Konrad traced through is to make the ACPI bits a guest interoperate with qemu etc. On bare metal it will be much more opaque and ugly; the processor related AML will probably burrow down into an SMI to do the real work.
Ross > > All I'm saying is, let's not hurry too much before we actually can > really trigger this on baremetal. > > Thanks. > > -- > Regards/Gruss, > Boris. > > Sent from a fat crate under my desk. Formatting is fine. > -- > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel
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