Messages in this thread | | | Subject | Re: [all better] Re: regression: massive trouble with fpu rework | From | Mike Galbraith <> | Date | Mon, 29 Jun 2015 10:41:13 +0200 |
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On Mon, 2015-06-29 at 10:33 +0200, Borislav Petkov wrote: > On Mon, Jun 29, 2015 at 10:25:29AM +0200, Mike Galbraith wrote: > > On Mon, 2015-06-29 at 08:40 +0200, Ingo Molnar wrote: > > > * > > > Ok, so could you please move the fpu__init_system() further up and see which > > > position is that starts breaking with the BIOS option set? > > > > > > here's the current, broken layout of the code: > > > > > > get_cpu_cap(c); > > > [0] fpu__init_system(c); > > > > > > if (this_cpu->c_early_init) > > > this_cpu->c_early_init(c); > > > [0] is the only spot that breaks box. > > I bet it is that > > /* Unmask CPUID levels if masked: */ > if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) { > if (msr_clear_bit(MSR_IA32_MISC_ENABLE, > MSR_IA32_MISC_ENABLE_LIMIT_CPUID_BIT) > 0) { > c->cpuid_level = cpuid_eax(0); > get_cpu_cap(c); > } > } > > in early_init_intel(). If you feel like playing, you might comment it > out to see what happens.
I'll poke after I get back from physical tort^Wtherapy.
-Mike
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