Merge tag 'kvm-x86-clocks-7.4' of https://github.com/kvm-x86/linux into HEAD

KVM x86 timekeeping fixes and cleanups for 7.4

Fix a variety of warts in KVM's handling of guest TSC, kvmclock, and
timekeeping in general, as a (big) first step towards addressing several
longstanding problems with the kvmclock implementation.

Most notably, fix a precision issue where get_kvmclock_ns() computed the
clock from the *host* TSC without applying guest TSC scaling, causing
systemic drift from the values the guest computes from its own TSC.

As a bonus cleanup, rip out the whole pvclock_gtod_data hack, which was
shadowing the kernel's timekeeping, and use ktime snapshots.

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