Re: [PATCH 1/7] Nested VMX patch 1 implements vmon and vmoff

[Avi Kivity <avi@redhat.com>]

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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