[Bug 203543] Starting with kernel 5.1.0-rc6, kvm_intel can no longer be loaded in nested kvm/guests

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203543

--- Comment #11 from Sean Christopherson (sean.j.christopherson@intel.com) ---
On Tue, May 21, 2019 at 07:11:01AM -0700, Sean Christopherson wrote:
> On Tue, May 21, 2019 at 01:37:42PM +0000, bugzilla-daemon@bugzilla.kernel.org
> wrote:
> > https://bugzilla.kernel.org/show_bug.cgi?id=203543
> > 
> > --- Comment #10 from moi@davidchill.ca ---
> > Reverting both commits solves this problem:
> > 
> > f93f7ede087f2edcc18e4b02310df5749a6b5a61
> > e51bfdb68725dc052d16241ace40ea3140f938aa
> 
> Hmm, that makes no sense, f93f7ede087f is a straight revert of
> e51bfdb68725.  I do see the same behavior on v5.2-rc1 where hiding the
> pmu from L1 breaks nested virtualization, but manually reverting both
> commits doesn't change that for me, i.e. there's another bug lurking,
> which I'll start hunting.

Scratch that, had a brain fart and tested the wrong kernel.  I do *NOT*
see breakage on v5.2-rc1, at least when running v5.2-rc1 as L1 and probing
KVM in L2.

When running v5.2-rc1 as L0, what are the values of MSRs 0x482 and 0x48e
in L1?

> 
> Any chance the successful test used a different command line or something?

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