virt/kvm/kvm_mm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef __KVM_MM_H__
   4 #define __KVM_MM_H__ 1
   5
   6 /*
   7  * Architectures can choose whether to use an rwlock or spinlock
   8  * for the mmu_lock.  These macros, for use in common code
   9  * only, avoids using #ifdefs in places that must deal with
  10  * multiple architectures.
  11  */
  12
  13 #ifdef KVM_HAVE_MMU_RWLOCK
  14 #define KVM_MMU_LOCK_INIT(kvm)          rwlock_init(&(kvm)->mmu_lock)
  15 #define KVM_MMU_LOCK(kvm)               write_lock(&(kvm)->mmu_lock)
  16 #define KVM_MMU_UNLOCK(kvm)             write_unlock(&(kvm)->mmu_lock)
  17 #else
  18 #define KVM_MMU_LOCK_INIT(kvm)          spin_lock_init(&(kvm)->mmu_lock)
  19 #define KVM_MMU_LOCK(kvm)               spin_lock(&(kvm)->mmu_lock)
  20 #define KVM_MMU_UNLOCK(kvm)             spin_unlock(&(kvm)->mmu_lock)
  21 #endif /* KVM_HAVE_MMU_RWLOCK */
  22
  23 kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool interruptible,
  24                      bool *async, bool write_fault, bool *writable);
  25
  26 #ifdef CONFIG_HAVE_KVM_PFNCACHE
  27 void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
  28                                        unsigned long start,
  29                                        unsigned long end);
  30 #else
  31 static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm,
  32                                                      unsigned long start,
  33                                                      unsigned long end)
  34 {
  35 }
  36 #endif /* HAVE_KVM_PFNCACHE */
  37
  38 #ifdef CONFIG_KVM_PRIVATE_MEM
  39 void kvm_gmem_init(struct module *module);
  40 int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args);
  41 int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot,
  42                   unsigned int fd, loff_t offset);
  43 void kvm_gmem_unbind(struct kvm_memory_slot *slot);
  44 #else
  45 static inline void kvm_gmem_init(struct module *module)
  46 {
  47
  48 }
  49
  50 static inline int kvm_gmem_bind(struct kvm *kvm,
  51                                          struct kvm_memory_slot *slot,
  52                                          unsigned int fd, loff_t offset)
  53 {
  54         WARN_ON_ONCE(1);
  55         return -EIO;
  56 }
  57
  58 static inline void kvm_gmem_unbind(struct kvm_memory_slot *slot)
  59 {
  60         WARN_ON_ONCE(1);
  61 }
  62 #endif /* CONFIG_KVM_PRIVATE_MEM */
  63
  64 #endif /* __KVM_MM_H__ */