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KVM: x86/mmu: only perform eager page splitting on valid roots

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Eager page splitting is an optimization; it does not have to be performed on
invalid roots.  It is also the only case in which a reader might acquire
a reference to an invalid root, so after this change we know that readers
will skip both dying and invalid roots.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-03-02 08:44:22 -05:00
parent 226b8c8f85
commit 7c554d8e51
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu/tdp_mmu.c
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@ -1464,7 +1464,7 @@ void kvm_tdp_mmu_try_split_huge_pages(struct kvm *kvm,
kvm_lockdep_assert_mmu_lock_held(kvm, shared);
for_each_tdp_mmu_root_yield_safe(kvm, root, slot->as_id, shared) {
for_each_valid_tdp_mmu_root_yield_safe(kvm, root, slot->as_id, shared) {
r = tdp_mmu_split_huge_pages_root(kvm, root, start, end, target_level, shared);
if (r) {
kvm_tdp_mmu_put_root(kvm, root, shared);