[Xen-devel] Saving/Restoring IA32_TSC_AUX MSR

["Nakajima, Jun" <jun.nakajima@xxxxxxxxx>]

I see the code like (in arch/x86/time.c), and wondering how IA32_TSC_AUX MSR is 
saved/restored at domain switch time.

    if ( (d->arch.tsc_mode ==  TSC_MODE_PVRDTSCP) &&
         boot_cpu_has(X86_FEATURE_RDTSCP) )
        write_rdtscp_aux(d->arch.incarnation);

BTW,

include/asm-x86/msr.h
#define write_rdtscp_aux(val) wrmsr(0xc0000103, (val), 0)

We should write like wrmsr(MSR_TSC_AUX, (val), 0) by adding 
+#define MSR_TSC_AUX            0xc0000103 /* Auxiliary TSC */
in include/asm-x86/msr-index.h

Thanks,
Jun
---
Intel Open Source Technology Center


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