RE: [Xen-devel] [RFC] Physical hot-add cpus and TSC

["Dong, Eddie" <eddie.dong@xxxxxxxxx>]

> Below is test result:
> a) With the patch
> Before hotadd:
> (XEN) TSC marked as reliable, warp = 0 (count=3)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 0 (count=4)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 0 (count=5)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 0 (count=6)
> (XEN) No domains have emulated TSC
> 
> After add
> (XEN) TSC marked as reliable, warp = 1669912421214 (count=15)
> (XEN) No domains have emulated TSC
> (XEN) TSC marked as reliable, warp = 1669912421214 (count=16)
> (XEN) No domains have emulated TSC
> 

If the warp is fixed, at least for HVM, this can be solved by adjusting the 
TSC_OFFSET with the additional warp to make guest see warp=0 for TSC invariant 
case. Anything missed?

Thx, Eddie
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