[Bug 203994] bhyve kernel module may need to relax some checks when running nested under KVM

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203994

            Bug ID: 203994
           Summary: bhyve kernel module may need to relax some checks when
                    running nested under KVM
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: grehan at FreeBSD.org

It has been reported that bhyve doesn't run nested under KVM
   http://docs.FreeBSD.org/cgi/mid.cgi?78cd6c472dfa583c81442d766e620bf7

The thread showed that the issues were related to vmm.ko checking
for particular features that aren't implemented in KVM - the INS/OUTS vmexit
capability, and also VPPID support in EPT.

These features (and perhaps others that haven't been hit) are not strictly
necessary to run bhyve. It may be worth relaxing the checks and implementing
workarounds for when the features aren't available, so that bhyve can run
nested in this mode.

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