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KVM: x86/mmu: split cpu_role from mmu_role
Snapshot the state of the processor registers that govern page walk into a new field of struct kvm_mmu. This is a more natural representation than having it *mostly* in mmu_role but not exclusively; the delta right now is represented in other fields, such as root_level. The nested MMU now has only the CPU role; and in fact the new function kvm_calc_cpu_role is analogous to the previous kvm_calc_nested_mmu_role, except that it has role.base.direct equal to !CR0.PG. For a walk-only MMU, "direct" has no meaning, but we set it to !CR0.PG so that role.ext.cr0_pg can go away in a future patch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Paolo Bonzini
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Apr 29, 2022
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