68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
// 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);
|
|
|
|
#endif /* __KVM_X86_MMU_TDP_ITER_H */
|