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Add a "struct kvm_mmu" to track a given MMU instance, e.g. a VM's stage-1 MMU versus a VM's stage-2 MMU, so that x86 can share MMU functionality for both stage-1 and stage-2 MMUs, without creating the potential for subtle bugs, e.g. due to consuming on vm->pgtable_levels when operating a stage-2 MMU. Encapsulate the existing de facto MMU in "struct kvm_vm", e.g instead of burying the MMU details in "struct kvm_vm_arch", to avoid more #ifdefs in ____vm_create(), and in the hopes that other architectures can utilize the formalized MMU structure if/when they too support stage-2 page tables. No functional change intended. Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev> Link: https://patch.msgid.link/20251230230150.4150236-7-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>