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Diffstat (limited to 'arch/x86/kvm/mmu/tdp_iter.h')
-rw-r--r--arch/x86/kvm/mmu/tdp_iter.h25
1 files changed, 19 insertions, 6 deletions
diff --git a/arch/x86/kvm/mmu/tdp_iter.h b/arch/x86/kvm/mmu/tdp_iter.h
index e19cabbcb65c..b1eaf6ec0e0b 100644
--- a/arch/x86/kvm/mmu/tdp_iter.h
+++ b/arch/x86/kvm/mmu/tdp_iter.h
@@ -7,7 +7,20 @@
#include "mmu.h"
-typedef u64 __rcu *tdp_ptep_t;
+/*
+ * TDP MMU SPTEs are RCU protected to allow paging structures (non-leaf SPTEs)
+ * to be zapped while holding mmu_lock for read, and to allow TLB flushes to be
+ * batched without having to collect the list of zapped SPs. Flows that can
+ * remove SPs must service pending TLB flushes prior to dropping RCU protection.
+ */
+static inline u64 kvm_tdp_mmu_read_spte(tdp_ptep_t sptep)
+{
+ return READ_ONCE(*rcu_dereference(sptep));
+}
+static inline void kvm_tdp_mmu_write_spte(tdp_ptep_t sptep, u64 val)
+{
+ WRITE_ONCE(*rcu_dereference(sptep), val);
+}
/*
* A TDP iterator performs a pre-order walk over a TDP paging structure.
@@ -57,17 +70,17 @@ struct tdp_iter {
* Iterates over every SPTE mapping the GFN range [start, end) in a
* preorder traversal.
*/
-#define for_each_tdp_pte_min_level(iter, root, root_level, min_level, start, end) \
- for (tdp_iter_start(&iter, root, root_level, min_level, start); \
+#define for_each_tdp_pte_min_level(iter, root, min_level, start, end) \
+ for (tdp_iter_start(&iter, root, min_level, start); \
iter.valid && iter.gfn < end; \
tdp_iter_next(&iter))
-#define for_each_tdp_pte(iter, root, root_level, start, end) \
- for_each_tdp_pte_min_level(iter, root, root_level, PG_LEVEL_4K, start, end)
+#define for_each_tdp_pte(iter, root, start, end) \
+ for_each_tdp_pte_min_level(iter, root, PG_LEVEL_4K, start, end)
tdp_ptep_t spte_to_child_pt(u64 pte, int level);
-void tdp_iter_start(struct tdp_iter *iter, u64 *root_pt, int root_level,
+void tdp_iter_start(struct tdp_iter *iter, struct kvm_mmu_page *root,
int min_level, gfn_t next_last_level_gfn);
void tdp_iter_next(struct tdp_iter *iter);
void tdp_iter_restart(struct tdp_iter *iter);