torvalds/linux

/* 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 */

kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible,
             bool *async, bool write_fault, bool *writable);

#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__ */