KVM: x86/mmu: Document that zapping invalidated roots doesn't need to flush

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Remove the misleading flush "handling" when zapping invalidated TDP MMU
roots, and document that flushing is unnecessary for all flavors of MMUs
when zapping invalid/obsolete roots/pages.  The "handling" in the TDP MMU
is dead code, as zap_gfn_range() is called with shared=true, in which
case it will never return true due to the flushing being handled by
tdp_mmu_zap_spte_atomic().

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Message-Id: <20220226001546.360188-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2022-02-26 00:15:23 +00:00 • committed by Paolo Bonzini

parent db01416b22

commit 7ae5840e6f

2 changed files with 17 additions and 8 deletions

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10

arch/x86/kvm/mmu/mmu.c

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15

arch/x86/kvm/mmu/tdp_mmu.c

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