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KVM: x86/mmu: Don't do TLB flush when zappings SPTEs in invalid roots

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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>
This commit is contained in:
Sean Christopherson
2024-01-10 18:00:42 -08:00
parent 8ca983631f
commit fcdffe97f8
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kvm/mmu/tdp_mmu.c
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@@ -811,7 +811,13 @@ static bool tdp_mmu_zap_leafs(struct kvm *kvm, struct kvm_mmu_page *root,
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();