[GIT PULL] KVM: x86 pull requests for 7.1

[Sean Christopherson]

There are some "fun" conflicts this time around between the "nested" pull
request and kvm/master (RSM fixes, ugh), and a notable oddity: there are two
versions of the "svm" pull request: a full version that includes a large set
of SEV changes to fix locking bugs and then add a lockdep assertion to guard
against similar bugs, and a short version without the SEV changes.

I'm including the partial/short version as the SEV changes haven't gotten
much soak time in -next, and (AFAIK) haven't been reviewed by anyone.  I
squeezed them into the initial pull request because the fixes are urgent
enough to warrant inclusion in 7.1 no matter what, and the hardening changes
largely fall into the category of "these either work or don't".

I don't have a strong preference between taking the full version now versus
waiting a ~week to give people more time to tell me what I broke.  But I do
really want to land the hardening sooner than later, e.g. see the rash of SEV+
bugs we've had...