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Re: [Xen-devel] [PATCH v2 00/14] Add VMX TSC scaling support

On 12/07/15 10:03, Egger, Christoph wrote:
> Did you consider nested virtualization?
> L1 hypervisor may have a different tsc scaling
> and L2 guest again may have a different tsc scale ratio.

Oh, I forgot this. I'll check the nested TSC scaling code (mostly
about nested SVM TSC ratio, because this patch series does not expose
VMX TSC scaling to L1 guest).

BTW, are there any practical usage scenarios of nested TSC scaling? If
any, I may also need to consider adding nested virtualization support
to VMX TSC scaling.


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