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xen-devel
RE: [Xen-devel] [PATCH 0/14] Nested Virtualization: Overview
Hi, Chris:
Christoph Egger wrote:
> Hi!
>
> This patch series brings Nested Virtualization to Xen.
> This is the third patch series. Improvements to the
> previous patch submission:
>
> - implement HVM-on-HVM (instead of SVM-on-HVM)
Given that we don't have consensus on cross architecture nested virtualization
support, I am doubting why this is urgent for now. I would prefer we make
SVM-on-SVM and VMX-on-VMX work first. After that, if you prove SVM-on-VMX has
real performance gain (which I doubt), we can see how to make a much generic
effort to accomodate both natively nested virtualization and cross architecture
nested virtualization.
Drawing a picture which doesn't have a real usage with massive common code
change is a kind of too much load for us now. Xen hvm_function table is a good
example. Intel enabled VMX at very beginning of Xen HVM support, and SVM comes
later on with a lot of code reuse from VMX side. Then the community and both
side work together to make an API wrapper to reuse common code better and
accomodate both architecture. I think we have to go similar path to make it
work first.
> - move cpuid handling into tools (per Keir's request)
>
> There might still be some nuances to fiddle with to make it
> fit for VMX. Feedback from Intel is appreciated, therefore.
>
Thx, Eddie
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