Linux kernel mirror (for testing)
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linux
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 */