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 void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order);
  50 #endif
  51
  52 #if defined(CONFIG_XEN_PV)
  53 int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
  54                   xen_pfn_t *pfn, int nr, int *err_ptr, pgprot_t prot,
  55                   unsigned int domid, bool no_translate);
  56 #else
  57 static inline int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
  58                                 xen_pfn_t *pfn, int nr, int *err_ptr,
  59                                 pgprot_t prot,  unsigned int domid,
  60                                 bool no_translate)
  61 {
  62         BUG();
  63         return 0;
  64 }
  65 #endif
  66
  67 struct vm_area_struct;
  68
  69 #ifdef CONFIG_XEN_AUTO_XLATE
  70 int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
  71                               unsigned long addr,
  72                               xen_pfn_t *gfn, int nr,
  73                               int *err_ptr, pgprot_t prot,
  74                               unsigned int domid,
  75                               struct page **pages);
  76 int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
  77                               int nr, struct page **pages);
  78 #else
  79 /*
  80  * These two functions are called from arch/x86/xen/mmu.c and so stubs
  81  * are needed for a configuration not specifying CONFIG_XEN_AUTO_XLATE.
  82  */
  83 static inline int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
  84                                             unsigned long addr,
  85                                             xen_pfn_t *gfn, int nr,
  86                                             int *err_ptr, pgprot_t prot,
  87                                             unsigned int domid,
  88                                             struct page **pages)
  89 {
  90         return -EOPNOTSUPP;
  91 }
  92
  93 static inline int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
  94                                             int nr, struct page **pages)
  95 {
  96         return -EOPNOTSUPP;
  97 }
  98 #endif
  99
 100 int xen_remap_vma_range(struct vm_area_struct *vma, unsigned long addr,
 101                         unsigned long len);
 102
 103 /*
 104  * xen_remap_domain_gfn_array() - map an array of foreign frames by gfn
 105  * @vma:     VMA to map the pages into
 106  * @addr:    Address at which to map the pages
 107  * @gfn:     Array of GFNs to map
 108  * @nr:      Number entries in the GFN array
 109  * @err_ptr: Returns per-GFN error status.
 110  * @prot:    page protection mask
 111  * @domid:   Domain owning the pages
 112  * @pages:   Array of pages if this domain has an auto-translated physmap
 113  *
 114  * @gfn and @err_ptr may point to the same buffer, the GFNs will be
 115  * overwritten by the error codes after they are mapped.
 116  *
 117  * Returns the number of successfully mapped frames, or a -ve error
 118  * code.
 119  */
 120 static inline int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
 121                                              unsigned long addr,
 122                                              xen_pfn_t *gfn, int nr,
 123                                              int *err_ptr, pgprot_t prot,
 124                                              unsigned int domid,
 125                                              struct page **pages)
 126 {
 127         if (xen_feature(XENFEAT_auto_translated_physmap))
 128                 return xen_xlate_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
 129                                                  prot, domid, pages);
 130
 131         /* We BUG_ON because it's a programmer error to pass a NULL err_ptr,
 132          * and the consequences later is quite hard to detect what the actual
 133          * cause of "wrong memory was mapped in".
 134          */
 135         BUG_ON(err_ptr == NULL);
 136         return xen_remap_pfn(vma, addr, gfn, nr, err_ptr, prot, domid,
 137                              false);
 138 }
 139
 140 /*
 141  * xen_remap_domain_mfn_array() - map an array of foreign frames by mfn
 142  * @vma:     VMA to map the pages into
 143  * @addr:    Address at which to map the pages
 144  * @mfn:     Array of MFNs to map
 145  * @nr:      Number entries in the MFN array
 146  * @err_ptr: Returns per-MFN error status.
 147  * @prot:    page protection mask
 148  * @domid:   Domain owning the pages
 149  *
 150  * @mfn and @err_ptr may point to the same buffer, the MFNs will be
 151  * overwritten by the error codes after they are mapped.
 152  *
 153  * Returns the number of successfully mapped frames, or a -ve error
 154  * code.
 155  */
 156 static inline int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
 157                                              unsigned long addr, xen_pfn_t *mfn,
 158                                              int nr, int *err_ptr,
 159                                              pgprot_t prot, unsigned int domid)
 160 {
 161         if (xen_feature(XENFEAT_auto_translated_physmap))
 162                 return -EOPNOTSUPP;
 163
 164         return xen_remap_pfn(vma, addr, mfn, nr, err_ptr, prot, domid,
 165                              true);
 166 }
 167
 168 /* xen_remap_domain_gfn_range() - map a range of foreign frames
 169  * @vma:     VMA to map the pages into
 170  * @addr:    Address at which to map the pages
 171  * @gfn:     First GFN to map.
 172  * @nr:      Number frames to map
 173  * @prot:    page protection mask
 174  * @domid:   Domain owning the pages
 175  * @pages:   Array of pages if this domain has an auto-translated physmap
 176  *
 177  * Returns the number of successfully mapped frames, or a -ve error
 178  * code.
 179  */
 180 static inline int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
 181                                              unsigned long addr,
 182                                              xen_pfn_t gfn, int nr,
 183                                              pgprot_t prot, unsigned int domid,
 184                                              struct page **pages)
 185 {
 186         if (xen_feature(XENFEAT_auto_translated_physmap))
 187                 return -EOPNOTSUPP;
 188
 189         return xen_remap_pfn(vma, addr, &gfn, nr, NULL, prot, domid, false);
 190 }
 191
 192 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
 193                                int numpgs, struct page **pages);
 194
 195 int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
 196                                   unsigned long nr_grant_frames);
 197
 198 bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 199
 200 void xen_efi_runtime_setup(void);
 201
 202
 203 #if defined(CONFIG_XEN_PV) && !defined(CONFIG_PREEMPTION)
 204
 205 DECLARE_PER_CPU(bool, xen_in_preemptible_hcall);
 206
 207 static inline void xen_preemptible_hcall_begin(void)
 208 {
 209         __this_cpu_write(xen_in_preemptible_hcall, true);
 210 }
 211
 212 static inline void xen_preemptible_hcall_end(void)
 213 {
 214         __this_cpu_write(xen_in_preemptible_hcall, false);
 215 }
 216
 217 #else
 218
 219 static inline void xen_preemptible_hcall_begin(void) { }
 220 static inline void xen_preemptible_hcall_end(void) { }
 221
 222 #endif /* CONFIG_XEN_PV && !CONFIG_PREEMPTION */
 223
 224 #endif /* INCLUDE_XEN_OPS_H */