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 <xen/features.h>
   9 #include <asm/xen/interface.h>
  10 #include <xen/interface/vcpu.h>
  11
  12 DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
  13
  14 DECLARE_PER_CPU(uint32_t, xen_vcpu_id);
  15 static inline uint32_t xen_vcpu_nr(int cpu)
  16 {
  17         return per_cpu(xen_vcpu_id, cpu);
  18 }
  19
  20 #define XEN_VCPU_ID_INVALID U32_MAX
  21
  22 void xen_arch_pre_suspend(void);
  23 void xen_arch_post_suspend(int suspend_cancelled);
  24
  25 void xen_timer_resume(void);
  26 void xen_arch_resume(void);
  27 void xen_arch_suspend(void);
  28
  29 void xen_reboot(int reason);
  30
  31 void xen_resume_notifier_register(struct notifier_block *nb);
  32 void xen_resume_notifier_unregister(struct notifier_block *nb);
  33
  34 bool xen_vcpu_stolen(int vcpu);
  35 void xen_setup_runstate_info(int cpu);
  36 void xen_time_setup_guest(void);
  37 void xen_manage_runstate_time(int action);
  38 void xen_get_runstate_snapshot(struct vcpu_runstate_info *res);
  39 u64 xen_steal_clock(int cpu);
  40
  41 int xen_setup_shutdown_event(void);
  42
  43 extern unsigned long *xen_contiguous_bitmap;
  44
  45 #if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64)
  46 int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order,
  47                                 unsigned int address_bits,
  48                                 dma_addr_t *dma_handle);
  49
  50 void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
  51 #else
  52 static inline int xen_create_contiguous_region(phys_addr_t pstart,
  53                                                unsigned int order,
  54                                                unsigned int address_bits,
  55                                                dma_addr_t *dma_handle)
  56 {
  57         return 0;
  58 }
  59
  60 static inline void xen_destroy_contiguous_region(phys_addr_t pstart,
  61                                                  unsigned int order) { }
  62 #endif
  63
  64 #if defined(CONFIG_XEN_PV)
  65 int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
  66                   xen_pfn_t *pfn, int nr, int *err_ptr, pgprot_t prot,
  67                   unsigned int domid, bool no_translate, struct page **pages);
  68 #else
  69 static inline int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
  70                                 xen_pfn_t *pfn, int nr, int *err_ptr,
  71                                 pgprot_t prot,  unsigned int domid,
  72                                 bool no_translate, struct page **pages)
  73 {
  74         BUG();
  75         return 0;
  76 }
  77 #endif
  78
  79 struct vm_area_struct;
  80
  81 #ifdef CONFIG_XEN_AUTO_XLATE
  82 int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
  83                               unsigned long addr,
  84                               xen_pfn_t *gfn, int nr,
  85                               int *err_ptr, pgprot_t prot,
  86                               unsigned int domid,
  87                               struct page **pages);
  88 int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
  89                               int nr, struct page **pages);
  90 #else
  91 /*
  92  * These two functions are called from arch/x86/xen/mmu.c and so stubs
  93  * are needed for a configuration not specifying CONFIG_XEN_AUTO_XLATE.
  94  */
  95 static inline int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
  96                                             unsigned long addr,
  97                                             xen_pfn_t *gfn, int nr,
  98                                             int *err_ptr, pgprot_t prot,
  99                                             unsigned int domid,
 100                                             struct page **pages)
 101 {
 102         return -EOPNOTSUPP;
 103 }
 104
 105 static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
 106                                             int nr, struct page **pages)
 107 {
 108         return -EOPNOTSUPP;
 109 }
 110 #endif
 111
 112 int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr,
 113                         unsigned long len);
 114
 115 /*
 116  * xen_remap_domain_gfn_array() - map an array of foreign frames by gfn
 117  * @vma:     VMA to map the pages into
 118  * @addr:    Address at which to map the pages
 119  * @gfn:     Array of GFNs to map
 120  * @nr:      Number entries in the GFN array
 121  * @err_ptr: Returns per-GFN error status.
 122  * @prot:    page protection mask
 123  * @domid:   Domain owning the pages
 124  * @pages:   Array of pages if this domain has an auto-translated physmap
 125  *
 126  * @gfn and @err_ptr may point to the same buffer, the GFNs will be
 127  * overwritten by the error codes after they are mapped.
 128  *
 129  * Returns the number of successfully mapped frames, or a -ve error
 130  * code.
 131  */
 132 static inline int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
 133                                              unsigned long addr,
 134                                              xen_pfn_t *gfn, int nr,
 135                                              int *err_ptr, pgprot_t prot,
 136                                              unsigned int domid,
 137                                              struct page **pages)
 138 {
 139         if (xen_feature(XENFEAT_auto_translated_physmap))
 140                 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
 141                                                  prot, domid, pages);
 142
 143         /* We BUG_ON because it's a programmer error to pass a NULL err_ptr,
 144          * and the consequences later is quite hard to detect what the actual
 145          * cause of "wrong memory was mapped in".
 146          */
 147         BUG_ON(err_ptr == NULL);
 148         return xen_remap_pfn(vma, addr, gfn, nr, err_ptr, prot, domid,
 149                              false, pages);
 150 }
 151
 152 /*
 153  * xen_remap_domain_mfn_array() - map an array of foreign frames by mfn
 154  * @vma:     VMA to map the pages into
 155  * @addr:    Address at which to map the pages
 156  * @mfn:     Array of MFNs to map
 157  * @nr:      Number entries in the MFN array
 158  * @err_ptr: Returns per-MFN error status.
 159  * @prot:    page protection mask
 160  * @domid:   Domain owning the pages
 161  * @pages:   Array of pages if this domain has an auto-translated physmap
 162  *
 163  * @mfn and @err_ptr may point to the same buffer, the MFNs will be
 164  * overwritten by the error codes after they are mapped.
 165  *
 166  * Returns the number of successfully mapped frames, or a -ve error
 167  * code.
 168  */
 169 static inline int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
 170                                              unsigned long addr, xen_pfn_t *mfn,
 171                                              int nr, int *err_ptr,
 172                                              pgprot_t prot, unsigned int domid,
 173                                              struct page **pages)
 174 {
 175         if (xen_feature(XENFEAT_auto_translated_physmap))
 176                 return -EOPNOTSUPP;
 177
 178         return xen_remap_pfn(vma, addr, mfn, nr, err_ptr, prot, domid,
 179                              true, pages);
 180 }
 181
 182 /* xen_remap_domain_gfn_range() - map a range of foreign frames
 183  * @vma:     VMA to map the pages into
 184  * @addr:    Address at which to map the pages
 185  * @gfn:     First GFN to map.
 186  * @nr:      Number frames to map
 187  * @prot:    page protection mask
 188  * @domid:   Domain owning the pages
 189  * @pages:   Array of pages if this domain has an auto-translated physmap
 190  *
 191  * Returns the number of successfully mapped frames, or a -ve error
 192  * code.
 193  */
 194 static inline int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
 195                                              unsigned long addr,
 196                                              xen_pfn_t gfn, int nr,
 197                                              pgprot_t prot, unsigned int domid,
 198                                              struct page **pages)
 199 {
 200         if (xen_feature(XENFEAT_auto_translated_physmap))
 201                 return -EOPNOTSUPP;
 202
 203         return xen_remap_pfn(vma, addr, &gfn, nr, NULL, prot, domid, false,
 204                              pages);
 205 }
 206
 207 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
 208                                int numpgs, struct page **pages);
 209
 210 int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
 211                                   unsigned long nr_grant_frames);
 212
 213 bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 214
 215 void xen_efi_runtime_setup(void);
 216
 217
 218 #ifdef CONFIG_PREEMPTION
 219
 220 static inline void xen_preemptible_hcall_begin(void)
 221 {
 222 }
 223
 224 static inline void xen_preemptible_hcall_end(void)
 225 {
 226 }
 227
 228 #else
 229
 230 DECLARE_PER_CPU(bool, xen_in_preemptible_hcall);
 231
 232 static inline void xen_preemptible_hcall_begin(void)
 233 {
 234         __this_cpu_write(xen_in_preemptible_hcall, true);
 235 }
 236
 237 static inline void xen_preemptible_hcall_end(void)
 238 {
 239         __this_cpu_write(xen_in_preemptible_hcall, false);
 240 }
 241
 242 #endif /* CONFIG_PREEMPTION */
 243
 244 #endif /* INCLUDE_XEN_OPS_H */