/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __KVM_MM_H__
#define __KVM_MM_H__ 1
/*
* Architectures can choose whether to use an rwlock or spinlock
* for the mmu_lock . These macros , for use in common code
* only , avoids using # ifdefs in places that must deal with
* multiple architectures .
*/
#ifdef KVM_HAVE_MMU_RWLOCK
#define KVM_MMU_LOCK_INIT(kvm) rwlock_init(&(kvm)->mmu_lock)
#define KVM_MMU_LOCK(kvm) write_lock(&(kvm)->mmu_lock)
#define KVM_MMU_UNLOCK(kvm) write_unlock(&(kvm)->mmu_lock)
#else
#define KVM_MMU_LOCK_INIT(kvm) spin_lock_init(&(kvm)->mmu_lock)
#define KVM_MMU_LOCK(kvm) spin_lock(&(kvm)->mmu_lock)
#define KVM_MMU_UNLOCK(kvm) spin_unlock(&(kvm)->mmu_lock)
#endif /* KVM_HAVE_MMU_RWLOCK */
struct kvm_follow_pfn {
const struct kvm_memory_slot *slot;
const gfn_t gfn;
unsigned long hva;
/* FOLL_* flags modifying lookup behavior, e.g. FOLL_WRITE. */
unsigned int flags;
/*
* Pin the page ( effectively FOLL_PIN , which is an mm / internal flag ) .
* The page * must * be pinned if KVM will write to the page via a kernel
* mapping , e . g . via kmap ( ) , mremap ( ) , etc .
*/
bool pin;
/*
* If non - NULL , try to get a writable mapping even for a read fault .
* Set to true if a writable mapping was obtained .
*/
bool *map_writable;
/*
* Optional output . Set to a valid " struct page " if the returned pfn
* is for a refcounted or pinned struct page , NULL if the returned pfn
* has no struct page or if the struct page is not being refcounted
* ( e . g . tail pages of non - compound higher order allocations from
* IO / PFNMAP mappings ) .
*/
struct page **refcounted_page;
};
kvm_pfn_t hva_to_pfn(struct kvm_follow_pfn *kfp);
#ifdef CONFIG_HAVE_KVM_PFNCACHE
void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
unsigned long start,
unsigned long end);
#else
static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
unsigned long start,
unsigned long end)
{
}
#endif /* HAVE_KVM_PFNCACHE */
#ifdef CONFIG_KVM_PRIVATE_MEM
void kvm_gmem_init(struct module *module);
int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args);
int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot,
unsigned int fd, loff_t offset);
void kvm_gmem_unbind(struct kvm_memory_slot *slot);
#else
static inline void kvm_gmem_init(struct module *module)
{
}
static inline int kvm_gmem_bind(struct kvm *kvm,
struct kvm_memory_slot *slot,
unsigned int fd, loff_t offset)
{
WARN_ON_ONCE(1 );
return -EIO;
}
static inline void kvm_gmem_unbind(struct kvm_memory_slot *slot)
{
WARN_ON_ONCE(1 );
}
#endif /* CONFIG_KVM_PRIVATE_MEM */
#endif /* __KVM_MM_H__ */
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¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-09-27)
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