On 12/21/2009 05:52 PM, Muli Ben-Yehuda wrote:
I would say that VMX only supports nesting if you define "supports" as "does not make it impossible". The fact that VMX operations in executed in non-root mode are trapped is welcome, but there's so much more that could be done in hardware to make nesting "better supported" that I would hesitate to say that the current generation of VMX supports nesting.
I would phrase it as "there is so much less the hardware can do to make nesting better supported" (such as avoid using vmread/vmwrite). As nested svm shows, you don't really need much (nested paging is very important though).
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