KVM: x86/mmu: Move "invalid" check out of kvm_tdp_mmu_get_root()
Move the check for an invalid root out of kvm_tdp_mmu_get_root() and into the one place it actually matters, tdp_mmu_next_root(), as the other user already has an implicit validity check. A future bug fix will need to get references to invalid roots to honor mmu_notifier requests; there's no point in forcing what will be a common path to open code getting a reference to a root. No functional change intended. Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20211215011557.399940-3-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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