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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __KVM_X86_MMU_INTERNAL_H
#define __KVM_X86_MMU_INTERNAL_H
#include <linux/types.h>
#include <asm/kvm_host.h>
struct kvm_mmu_page {
struct list_head link;
struct hlist_node hash_link;
struct list_head lpage_disallowed_link;
bool unsync;
u8 mmu_valid_gen;
bool mmio_cached;
bool lpage_disallowed; /* Can't be replaced by an equiv large page */
/*
* The following two entries are used to key the shadow page in the
* hash table.
*/
union kvm_mmu_page_role role;
gfn_t gfn;
u64 *spt;
/* hold the gfn of each spte inside spt */
gfn_t *gfns;
int root_count; /* Currently serving as active root */
unsigned int unsync_children;
struct kvm_rmap_head parent_ptes; /* rmap pointers to parent sptes */
DECLARE_BITMAP(unsync_child_bitmap, 512);
#ifdef CONFIG_X86_32
/*
* Used out of the mmu-lock to avoid reading spte values while an
* update is in progress; see the comments in __get_spte_lockless().
*/
int clear_spte_count;
#endif
/* Number of writes since the last time traversal visited this page. */
atomic_t write_flooding_count;
};
static inline struct kvm_mmu_page *to_shadow_page(hpa_t shadow_page)
{
struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
return (struct kvm_mmu_page *)page_private(page);
}
static inline struct kvm_mmu_page *sptep_to_sp(u64 *sptep)
{
return to_shadow_page(__pa(sptep));
}
void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn);
bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
struct kvm_memory_slot *slot, u64 gfn);
#endif /* __KVM_X86_MMU_INTERNAL_H */
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