[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 02/15] x86/cpu: Fix common cpuid faulting probing for AMD and Hygon
>>> On 02.04.19 at 13:58, <puwen@xxxxxxxx> wrote: > On 2019/4/2 18:20, Jan Beulich wrote: >> On 02.04.19 at 08:46, <puwen@xxxxxxxx> wrote: >>> On 2019/4/1 16:41, Jan Beulich wrote: >>>> On 30.03.19 at 11:42, <puwen@xxxxxxxx> wrote: >>>>> There is no MSR_INTEL_PLATFORM_INFO for AMD and Hygon families. So >>>>> directly >>>>> return false in the function probe_cpuid_faulting() if >>>>> !cpu_has_hypervisor. >>>> >>>> I think it would have been nice if you had mentioned the real >>>> reason why you want to bypass the MSR accesses. This way it >>>> sounds as if the change was only cosmetic, and hence could be >>>> left out. >>> >>> Okay, how about the new description: >>> There is no MSR_INTEL_PLATFORM_INFO for AMD and Hygon families. Read >>> this MSR will stop the Xen initialization process >> >> "... for some early Hygon steppings"(?). I'm unaware of AMD CPUs > > Yes,for some early Hygon steppings. > >> having this issue - are you telling us otherwise? > > I tested with an AMD CPU(Family 17h, Model 1, Stepping 1) today, and > it also stopped when reading the MSR_INTEL_PLATFORM_INFO instead of > producing #GP(0). I've yet to try it out on my Rome system, but I have to admit I find this hard to believe. Andrew - you've tried to boot Xen on a Rome already. Iirc you said it crashed, but did it perhaps get to (and past) this point? Jan _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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