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    SubjectRe: [patch V4 part 4 11/24] x86/mce: Use untraced rd/wrmsr in the MCE offline/crash check
    On Tue, May 5, 2020 at 7:16 AM Thomas Gleixner <tglx@linutronix.de> wrote:
    >
    > mce_check_crashing_cpu() is called right at the entry of the MCE
    > handler. It uses mce_rdmsr() and mce_wrmsr() which are wrappers around
    > rdmsr() and wrmsr() to handle the MCE error injection mechanism, which is
    > pointless in this context, i.e. when the MCE hits an offline CPU or the
    > system is already marked crashing.
    >
    > The MSR access can also be traced, so use the untraceable variants. This
    > is also safe vs. XEN paravirt as these MSRs are not affected by XEN PV
    > modifications.


    Acked-by: Andy Lutomirski <luto@kernel.org>

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