kernel: draft of cpuid rewrite

[gurka]

First draft of cpuid rewrite. Open questions:

• Is the cache necessary? I did some research and found that cpuid is a pretty expensive call, but maybe the overhead of the cache makes it useless.
• Maybe add vendor information to each FeatureInfo since not all features are applicable to both Intel and AMD CPUs. At the moment the user needs to first check isIntelCpu or isAmdCpu before asking for a specific feature (if the feature is not applicable to both).

[jenkins-includeos]

Can one of the admins verify this patch with one of the following commands:

• "test please" for a one time test run
• "ok to test" to accept latest and future commits on this pull request for testing
• "add to whitelist" to add the author to the whitelist

[fwsGonzo]

Looks really nice :) Now we just need the kvm paravirtual stuff, from here: https://www.kernel.org/doc/Documentation/virtual/kvm/cpuid.txt

I tried making PV_EOI work, but it's not setting the bit for me. I suspect we have to check the feature first maybe. Or maybe it's just not enabled

NOTE: function: define KVM_CPUID_FEATURES (0x40000001) <-- IS A LIE
you have to explicitly check EAX for the location oif the kvm cpu features

[fwsGonzo]

ok to test