[Xen-devel] smp_prepare_boot_cpu

[maheen butt <maheen_butt26@xxxxxxxxx>]

Hi,

In start_xen():xen/arch/x86/setup.c

has function smp_prepare_boot_cpu() which also exist in vanilla kernel

the kernel version is given that:

void __init native_smp_prepare_boot_cpu(void)
{
    int me = smp_processor_id();
    switch_to_new_gdt(me);
    /* already set me in cpu_online_mask in boot_cpu_init() */
    cpumask_set_cpu(me, cpu_callout_mask);
    per_cpu(cpu_state, me) = CPU_ONLINE;
}

Whera in case of Xen we have:

void __init smp_prepare_boot_cpu(void)
{
    cpumask_set_cpu(smp_processor_id(), &cpu_online_map);
    cpumask_set_cpu(smp_processor_id(), &cpu_present_map);
}
My question is that why there is no need to change gdt pointer to current cpu segment as it is

done in case of kernel code?

Thanks

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