a6a0b05da9
Dirty logging is a key feature of the KVM MMU and must be supported by the TDP MMU. Add support for both the write protection and PML dirty logging modes. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20201014182700.2888246-16-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef __KVM_X86_MMU_TDP_ITER_H
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#define __KVM_X86_MMU_TDP_ITER_H
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#include <linux/kvm_host.h>
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#include "mmu.h"
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/*
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* A TDP iterator performs a pre-order walk over a TDP paging structure.
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*/
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struct tdp_iter {
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/*
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* The iterator will traverse the paging structure towards the mapping
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* for this GFN.
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*/
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gfn_t goal_gfn;
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/* Pointers to the page tables traversed to reach the current SPTE */
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u64 *pt_path[PT64_ROOT_MAX_LEVEL];
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/* A pointer to the current SPTE */
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u64 *sptep;
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/* The lowest GFN mapped by the current SPTE */
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gfn_t gfn;
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/* The level of the root page given to the iterator */
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int root_level;
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/* The lowest level the iterator should traverse to */
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int min_level;
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/* The iterator's current level within the paging structure */
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int level;
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/* A snapshot of the value at sptep */
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u64 old_spte;
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/*
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* Whether the iterator has a valid state. This will be false if the
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* iterator walks off the end of the paging structure.
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*/
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bool valid;
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};
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/*
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* Iterates over every SPTE mapping the GFN range [start, end) in a
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* preorder traversal.
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*/
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#define for_each_tdp_pte_min_level(iter, root, root_level, min_level, start, end) \
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for (tdp_iter_start(&iter, root, root_level, min_level, start); \
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iter.valid && iter.gfn < end; \
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tdp_iter_next(&iter))
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#define for_each_tdp_pte(iter, root, root_level, start, end) \
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for_each_tdp_pte_min_level(iter, root, root_level, PG_LEVEL_4K, start, end)
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u64 *spte_to_child_pt(u64 pte, int level);
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void tdp_iter_start(struct tdp_iter *iter, u64 *root_pt, int root_level,
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int min_level, gfn_t goal_gfn);
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void tdp_iter_next(struct tdp_iter *iter);
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void tdp_iter_refresh_walk(struct tdp_iter *iter);
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u64 *tdp_iter_root_pt(struct tdp_iter *iter);
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#endif /* __KVM_X86_MMU_TDP_ITER_H */
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