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SubjectRe: [PATCH 0/9] KVM: Make the instruction emulator aware of Nested Virtualization
On Thu, Nov 25, 2010 at 12:46:40PM +0100, Roedel, Joerg wrote:
> We basically have two choices here:
> a) We expose svm internals into the emulator
> b) We expose emulator internals into svm
> Both choices are not really good from a software-design point-of-view.
> But I think option b) is the better one because it is easier to cope with
> and thus less likely to break when changing the emulator code.

What we could do probably is to define the interface between the
emulator and the architecture code in a better way. This would take the
burden of going into architecture code for emulator changes away.

The current patch-set only needs a subset of the decode-cache (in the
future probably also a subset of the fetch-cache). We could put this
information into a seperate struct and give it to the architecture code.

I planned to make the guest_mode flag a generic x86 vcpu property
anyway, so building this structure could be limited to instructions
emulated while the vcpu is in guest mode thus avoiding the overhead for
the default case.


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