include/xen/xen-ops.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef INCLUDE_XEN_OPS_H
   3 #define INCLUDE_XEN_OPS_H
   4
   5 #include <linux/percpu.h>
   6 #include <linux/notifier.h>
   7 #include <linux/efi.h>
   8 #include <linux/virtio_anchor.h>
   9 #include <xen/features.h>
  10 #include <asm/xen/interface.h>
  11 #include <xen/interface/vcpu.h>
  12
  13 DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
  14
  15 DECLARE_PER_CPU(uint32_t, xen_vcpu_id);
  16 static inline uint32_t xen_vcpu_nr(int cpu)
  17 {
  18         return per_cpu(xen_vcpu_id, cpu);
  19 }
  20
  21 #define XEN_VCPU_ID_INVALID U32_MAX
  22
  23 void xen_arch_pre_suspend(void);
  24 void xen_arch_post_suspend(int suspend_cancelled);
  25
  26 void xen_timer_resume(void);
  27 void xen_arch_resume(void);
  28 void xen_arch_suspend(void);
  29
  30 void xen_reboot(int reason);
  31
  32 void xen_resume_notifier_register(struct notifier_block *nb);
  33 void xen_resume_notifier_unregister(struct notifier_block *nb);
  34
  35 bool xen_vcpu_stolen(int vcpu);
  36 void xen_setup_runstate_info(int cpu);
  37 void xen_time_setup_guest(void);
  38 void xen_manage_runstate_time(int action);
  39 void xen_get_runstate_snapshot(struct vcpu_runstate_info *res);
  40 u64 xen_steal_clock(int cpu);
  41
  42 int xen_setup_shutdown_event(void);
  43
  44 extern unsigned long *xen_contiguous_bitmap;
  45
  46 #if defined(CONFIG_XEN_PV)
  47 int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
  48                   xen_pfn_t *pfn, int nr, int *err_ptr, pgprot_t prot,
  49                   unsigned int domid, bool no_translate);
  50 #else
  51 static inline int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
  52                                 xen_pfn_t *pfn, int nr, int *err_ptr,
  53                                 pgprot_t prot,  unsigned int domid,
  54                                 bool no_translate)
  55 {
  56         BUG();
  57         return 0;
  58 }
  59 #endif
  60
  61 struct vm_area_struct;
  62
  63 #ifdef CONFIG_XEN_AUTO_XLATE
  64 int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
  65                               unsigned long addr,
  66                               xen_pfn_t *gfn, int nr,
  67                               int *err_ptr, pgprot_t prot,
  68                               unsigned int domid,
  69                               struct page **pages);
  70 int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
  71                               int nr, struct page **pages);
  72 #else
  73 /*
  74  * These two functions are called from arch/x86/xen/mmu.c and so stubs
  75  * are needed for a configuration not specifying CONFIG_XEN_AUTO_XLATE.
  76  */
  77 static inline int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
  78                                             unsigned long addr,
  79                                             xen_pfn_t *gfn, int nr,
  80                                             int *err_ptr, pgprot_t prot,
  81                                             unsigned int domid,
  82                                             struct page **pages)
  83 {
  84         return -EOPNOTSUPP;
  85 }
  86
  87 static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
  88                                             int nr, struct page **pages)
  89 {
  90         return -EOPNOTSUPP;
  91 }
  92 #endif
  93
  94 int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr,
  95                         unsigned long len);
  96
  97 /*
  98  * xen_remap_domain_gfn_array() - map an array of foreign frames by gfn
  99  * @vma:     VMA to map the pages into
 100  * @addr:    Address at which to map the pages
 101  * @gfn:     Array of GFNs to map
 102  * @nr:      Number entries in the GFN array
 103  * @err_ptr: Returns per-GFN error status.
 104  * @prot:    page protection mask
 105  * @domid:   Domain owning the pages
 106  * @pages:   Array of pages if this domain has an auto-translated physmap
 107  *
 108  * @gfn and @err_ptr may point to the same buffer, the GFNs will be
 109  * overwritten by the error codes after they are mapped.
 110  *
 111  * Returns the number of successfully mapped frames, or a -ve error
 112  * code.
 113  */
 114 static inline int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
 115                                              unsigned long addr,
 116                                              xen_pfn_t *gfn, int nr,
 117                                              int *err_ptr, pgprot_t prot,
 118                                              unsigned int domid,
 119                                              struct page **pages)
 120 {
 121         if (xen_feature(XENFEAT_auto_translated_physmap))
 122                 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
 123                                                  prot, domid, pages);
 124
 125         /* We BUG_ON because it's a programmer error to pass a NULL err_ptr,
 126          * and the consequences later is quite hard to detect what the actual
 127          * cause of "wrong memory was mapped in".
 128          */
 129         BUG_ON(err_ptr == NULL);
 130         return xen_remap_pfn(vma, addr, gfn, nr, err_ptr, prot, domid,
 131                              false);
 132 }
 133
 134 /*
 135  * xen_remap_domain_mfn_array() - map an array of foreign frames by mfn
 136  * @vma:     VMA to map the pages into
 137  * @addr:    Address at which to map the pages
 138  * @mfn:     Array of MFNs to map
 139  * @nr:      Number entries in the MFN array
 140  * @err_ptr: Returns per-MFN error status.
 141  * @prot:    page protection mask
 142  * @domid:   Domain owning the pages
 143  *
 144  * @mfn and @err_ptr may point to the same buffer, the MFNs will be
 145  * overwritten by the error codes after they are mapped.
 146  *
 147  * Returns the number of successfully mapped frames, or a -ve error
 148  * code.
 149  */
 150 static inline int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
 151                                              unsigned long addr, xen_pfn_t *mfn,
 152                                              int nr, int *err_ptr,
 153                                              pgprot_t prot, unsigned int domid)
 154 {
 155         if (xen_feature(XENFEAT_auto_translated_physmap))
 156                 return -EOPNOTSUPP;
 157
 158         return xen_remap_pfn(vma, addr, mfn, nr, err_ptr, prot, domid,
 159                              true);
 160 }
 161
 162 /* xen_remap_domain_gfn_range() - map a range of foreign frames
 163  * @vma:     VMA to map the pages into
 164  * @addr:    Address at which to map the pages
 165  * @gfn:     First GFN to map.
 166  * @nr:      Number frames to map
 167  * @prot:    page protection mask
 168  * @domid:   Domain owning the pages
 169  * @pages:   Array of pages if this domain has an auto-translated physmap
 170  *
 171  * Returns the number of successfully mapped frames, or a -ve error
 172  * code.
 173  */
 174 static inline int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
 175                                              unsigned long addr,
 176                                              xen_pfn_t gfn, int nr,
 177                                              pgprot_t prot, unsigned int domid,
 178                                              struct page **pages)
 179 {
 180         if (xen_feature(XENFEAT_auto_translated_physmap))
 181                 return -EOPNOTSUPP;
 182
 183         return xen_remap_pfn(vma, addr, &gfn, nr, NULL, prot, domid, false);
 184 }
 185
 186 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
 187                                int numpgs, struct page **pages);
 188
 189 int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
 190                                   unsigned long nr_grant_frames);
 191
 192 bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 193
 194 void xen_efi_runtime_setup(void);
 195
 196
 197 #if defined(CONFIG_XEN_PV) && !defined(CONFIG_PREEMPTION)
 198
 199 DECLARE_PER_CPU(bool, xen_in_preemptible_hcall);
 200
 201 static inline void xen_preemptible_hcall_begin(void)
 202 {
 203         __this_cpu_write(xen_in_preemptible_hcall, true);
 204 }
 205
 206 static inline void xen_preemptible_hcall_end(void)
 207 {
 208         __this_cpu_write(xen_in_preemptible_hcall, false);
 209 }
 210
 211 #else
 212
 213 static inline void xen_preemptible_hcall_begin(void) { }
 214 static inline void xen_preemptible_hcall_end(void) { }
 215
 216 #endif /* CONFIG_XEN_PV && !CONFIG_PREEMPTION */
 217
 218 #ifdef CONFIG_XEN_GRANT_DMA_OPS
 219 bool xen_virtio_restricted_mem_acc(struct virtio_device *dev);
 220 #else
 221 struct virtio_device;
 222
 223 static inline bool xen_virtio_restricted_mem_acc(struct virtio_device *dev)
 224 {
 225         return false;
 226 }
 227 #endif /* CONFIG_XEN_GRANT_DMA_OPS */
 228
 229 #endif /* INCLUDE_XEN_OPS_H */