Factor in whether or not the old/new SPTEs are shadow-present when
adjusting the large page stats in the TDP MMU. A modified MMIO SPTE can
toggle the page size bit, as bit 7 is used to store the MMIO generation,
i.e. is_large_pte() can get a false positive when called on a MMIO SPTE.
Ditto for nuking SPTEs with REMOVED_SPTE, which sets bit 7 in its magic
value.
Opportunistically move the logic below the check to verify at least one
of the old/new SPTEs is shadow present.
Use is/was_leaf even though is/was_present would suffice. The code
generation is roughly equivalent since all flags need to be computed
prior to the code in question, and using the *_leaf flags will minimize
the diff in a future enhancement to account all pages, i.e. will change
the check to "is_leaf != was_leaf".
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx>
---
arch/x86/kvm/mmu/tdp_mmu.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index caac4ddb46df..cba2ab5db2a0 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -413,6 +413,7 @@ static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
bool was_leaf = was_present && is_last_spte(old_spte, level);
bool is_leaf = is_present && is_last_spte(new_spte, level);
bool pfn_changed = spte_to_pfn(old_spte) != spte_to_pfn(new_spte);
+ bool was_large, is_large;
WARN_ON(level > PT64_ROOT_MAX_LEVEL);
WARN_ON(level < PG_LEVEL_4K);
@@ -446,13 +447,6 @@ static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
trace_kvm_tdp_mmu_spte_changed(as_id, gfn, level, old_spte, new_spte);
- if (is_large_pte(old_spte) != is_large_pte(new_spte)) {
- if (is_large_pte(old_spte))
- atomic64_sub(1, (atomic64_t*)&kvm->stat.lpages);
- else
- atomic64_add(1, (atomic64_t*)&kvm->stat.lpages);
- }
-
/*
* The only times a SPTE should be changed from a non-present to
* non-present state is when an MMIO entry is installed/modified/
@@ -478,6 +472,18 @@ static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
return;
}
+ /*
+ * Update large page stats if a large page is being zapped, created, or
+ * is replacing an existing shadow page.
+ */
+ was_large = was_leaf && is_large_pte(old_spte);
+ is_large = is_leaf && is_large_pte(new_spte);
+ if (was_large != is_large) {
+ if (was_large)
+ atomic64_sub(1, (atomic64_t *)&kvm->stat.lpages);
+ else
+ atomic64_add(1, (atomic64_t *)&kvm->stat.lpages);
+ }
if (was_leaf && is_dirty_spte(old_spte) &&
(!is_present || !is_dirty_spte(new_spte) || pfn_changed))
--
2.32.0.432.gabb21c7263-goog
