Messages in this thread | | | From | Jue Wang <> | Date | Fri, 18 Feb 2022 08:21:36 -0800 | Subject | Re: [PATCH v2] x86/mce: work around an erratum on fast string copy instructions. |
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On Fri, Feb 18, 2022 at 8:14 AM Borislav Petkov <bp@alien8.de> wrote: > > On Fri, Feb 18, 2022 at 08:03:24AM -0800, Jue Wang wrote: > > Since MSR_IA32_MISC_ENABLE is not a MCA register, I wonder if we want > > to mix its read/write with the injected MCE code. > > > > I was a bit concerned about potential race with mce-inject and the > > read/write to MSR_IA32_MISC_ENABLE. > > It won't inject anything: > > offset = msr_to_offset(msr); > if (offset < 0) > ret = 0; > Thanks.
My concern was that here returns 0 instead the value read from the msr.
Maybe this cannot happen? > > Besides, you need to use those routines due to EX_TYPE_{RD,WR}MSR_IN_MCE > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette
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