[Xen-devel] The context switch overhead comparison between vmexit/vmentry and hypercall.

["Liang Yang" <multisyncfe991@xxxxxxxxxxx>]

Hi,

If I just considering the pure context switch ovehead, which one has bigger 
overhead, using HW vmexit/vmentry to do root and non-root mode switch by 
programming VT-x vetor or using SW hypercall to inject interrupt to switch 
from ring 1 to ring 0 (or ring 3 to ring 0 for 64bit OS)? Does the switch 
between ring1 and ring0 has the same overhead as the switch between ring 3 
and ring0?
BTW, both root and non-root mode has four rings, if the ring0 and ring3 in 
non-root mode are used for guest os kernel and user applications, which ring 
level in root mode will be used when doing vmexit?
Thanks,

Liang


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