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// SPDX-License-Identifier: GPL-2.0
#ifndef __KVM_X86_MMU_TDP_ITER_H
#define __KVM_X86_MMU_TDP_ITER_H
#include <linux/kvm_host.h>
#include "mmu.h"
typedef u64 __rcu *tdp_ptep_t;
/*
* A TDP iterator performs a pre-order walk over a TDP paging structure.
*/
struct tdp_iter {
/*
* The iterator will traverse the paging structure towards the mapping
* for this GFN.
*/
gfn_t next_last_level_gfn;
/*
* The next_last_level_gfn at the time when the thread last
* yielded. Only yielding when the next_last_level_gfn !=
* yielded_gfn helps ensure forward progress.
*/
gfn_t yielded_gfn;
/* Pointers to the page tables traversed to reach the current SPTE */
tdp_ptep_t pt_path[PT64_ROOT_MAX_LEVEL];
/* A pointer to the current SPTE */
tdp_ptep_t sptep;
/* The lowest GFN mapped by the current SPTE */
gfn_t gfn;
/* The level of the root page given to the iterator */
int root_level;
/* The lowest level the iterator should traverse to */
int min_level;
/* The iterator's current level within the paging structure */
int level;
/* A snapshot of the value at sptep */
u64 old_spte;
/*
* Whether the iterator has a valid state. This will be false if the
* iterator walks off the end of the paging structure.
*/
bool valid;
};
/*
* 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); \
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)
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,
int min_level, gfn_t next_last_level_gfn);
void tdp_iter_next(struct tdp_iter *iter);
tdp_ptep_t tdp_iter_root_pt(struct tdp_iter *iter);
void tdp_iter_restart(struct tdp_iter *iter);
#endif /* __KVM_X86_MMU_TDP_ITER_H */
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