[Xen-devel] switch vcpu on physical cpu

[xennn <openbg@xxxxxx>]

hello all 

I would like to ask about switching vcpu-s on physcial one when we have
paravirtualization. 

I think tha actual switching is happaning at switch_kernel_stack(struct vcpu
*v) function in domain.c file.


static inline void switch_kernel_stack(struct vcpu *v)
{
    struct tss_struct *tss = &this_cpu(init_tss);
    tss->esp1 = v->arch.pv_vcpu.kernel_sp;
    tss->ss1  = v->arch.pv_vcpu.kernel_ss;
}

Here the actual task switching is happen - the kernel stack of the current
physical cpu is get by this_cpu() 
and afther that the kernel stack of that current task is changed to the
vcpu's one.  So the task is swiched to the new vcpu state. 

Is that correct?

I would like to ask what is tss_struct - task structure, task stack segment
structure or something else?

Best Regards




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