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KVM: x86/mmu: unify root_gva_walk and ngva_walk

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At this point, vcpu->arch.ngva_walk and vcpu->arch.root_gva_walk contain
the same information; compare init_kvm_page_walk() on one side with
init_kvm_softmmu() + shadow_mmu_init_context() on the other.  They only
differ in when each is active, and root_gva_walk is also used by shadow
paging, via FNAME(walk_addr) and its callers.

Always use the same instance of kvm_pagewalk to do GVA->GPA translations,
for both guest emulation and shadow paging, instead of flipping the
gva_walk pointer back and forth.  After all the page walking does behave
the same no matter if you are in guest mode or not; the difference lies
in the behavior of kvm_translate_gpa and thus in vcpu->arch.mmu, not in
the page walker itself.

This completes the transition from walk_mmu/nested_mmu as the page
walking entry points to gva_walk/ngpa_walk, and removes duplicated
code between the initialization of root_mmu.w and ngva_walk (The
Struct Formerly Known As nested_mmu).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2026-05-11 06:19:00 -04:00
commit 148fe965df
9 changed files with 60 additions and 112 deletions
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