Don't force a TLB flush when zapping SPTEs in invalid roots as vCPUs
can't be actively using invalid roots (zapping SPTEs in invalid roots is
necessary only to ensure KVM doesn't mark a page accessed/dirty after it
is freed by the primary MMU).
Link: https://lore.kernel.org/r/20240111020048.844847-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
continue;
tdp_mmu_iter_set_spte(kvm, &iter, 0);
- flush = true;
+
+ /*
+ * Zappings SPTEs in invalid roots doesn't require a TLB flush,
+ * see kvm_tdp_mmu_zap_invalidated_roots() for details.
+ */
+ if (!root->role.invalid)
+ flush = true;
}
rcu_read_unlock();