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