Merge tag 'kvm-x86-selftests-6.20' of https://github.com/kvm-x86/linux into HEAD

Merge tag 'kvm-x86-selftests-6.20' of https://github.com/kvm-x86/linux into HEAD

KVM selftests changes for 6.20

 - Add a regression test for TPR<=>CR8 synchronization and IRQ masking.

 - Overhaul selftest's MMU infrastructure to genericize stage-2 MMU support,
   and extend x86's infrastructure to support EPT and NPT (for L2 guests).

 - Extend several nested VMX tests to also cover nested SVM.

 - Add a selftest for nested VMLOAD/VMSAVE.

 - Rework the nested dirty log test, originally added as a regression test for
   PML where KVM logged L2 GPAs instead of L1 GPAs, to improve test coverage
   and to hopefully make the test easier to understand and maintain.