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1 | #ifndef _LGUEST_H |
2 | #define _LGUEST_H | |
3 | ||
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4 | #ifndef __ASSEMBLY__ |
5 | #include <linux/types.h> | |
6 | #include <linux/init.h> | |
7 | #include <linux/stringify.h> | |
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8 | #include <linux/futex.h> |
9 | #include <linux/lguest.h> | |
10 | #include <linux/lguest_launcher.h> | |
11 | #include <linux/wait.h> | |
12 | #include <linux/err.h> | |
13 | #include <asm/semaphore.h> | |
d7e28ffe | 14 | |
625efab1 | 15 | #include <asm/lguest.h> |
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16 | |
17 | void free_pagetables(void); | |
18 | int init_pagetables(struct page **switcher_page, unsigned int pages); | |
19 | ||
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20 | struct lguest_dma_info |
21 | { | |
22 | struct list_head list; | |
23 | union futex_key key; | |
24 | unsigned long dmas; | |
48245cc0 | 25 | struct lguest *owner; |
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26 | u16 next_dma; |
27 | u16 num_dmas; | |
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28 | u8 interrupt; /* 0 when not registered */ |
29 | }; | |
30 | ||
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31 | struct pgdir |
32 | { | |
ee3db0f2 | 33 | unsigned long gpgdir; |
df29f43e | 34 | pgd_t *pgdir; |
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35 | }; |
36 | ||
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37 | /* We have two pages shared with guests, per cpu. */ |
38 | struct lguest_pages | |
39 | { | |
40 | /* This is the stack page mapped rw in guest */ | |
41 | char spare[PAGE_SIZE - sizeof(struct lguest_regs)]; | |
42 | struct lguest_regs regs; | |
43 | ||
44 | /* This is the host state & guest descriptor page, ro in guest */ | |
45 | struct lguest_ro_state state; | |
46 | } __attribute__((aligned(PAGE_SIZE))); | |
47 | ||
48 | #define CHANGED_IDT 1 | |
49 | #define CHANGED_GDT 2 | |
50 | #define CHANGED_GDT_TLS 4 /* Actually a subset of CHANGED_GDT */ | |
51 | #define CHANGED_ALL 3 | |
52 | ||
53 | /* The private info the thread maintains about the guest. */ | |
54 | struct lguest | |
55 | { | |
56 | /* At end of a page shared mapped over lguest_pages in guest. */ | |
57 | unsigned long regs_page; | |
58 | struct lguest_regs *regs; | |
59 | struct lguest_data __user *lguest_data; | |
60 | struct task_struct *tsk; | |
61 | struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ | |
d7e28ffe | 62 | u32 pfn_limit; |
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63 | /* This provides the offset to the base of guest-physical |
64 | * memory in the Launcher. */ | |
65 | void __user *mem_base; | |
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66 | u32 page_offset; |
67 | u32 cr2; | |
68 | int halted; | |
69 | int ts; | |
70 | u32 next_hcall; | |
71 | u32 esp1; | |
72 | u8 ss1; | |
73 | ||
cc6d4fbc | 74 | /* If a hypercall was asked for, this points to the arguments. */ |
b410e7b1 | 75 | struct hcall_args *hcall; |
cc6d4fbc | 76 | |
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77 | /* Do we need to stop what we're doing and return to userspace? */ |
78 | int break_out; | |
79 | wait_queue_head_t break_wq; | |
80 | ||
81 | /* Bitmap of what has changed: see CHANGED_* above. */ | |
82 | int changed; | |
83 | struct lguest_pages *last_pages; | |
84 | ||
85 | /* We keep a small number of these. */ | |
86 | u32 pgdidx; | |
87 | struct pgdir pgdirs[4]; | |
88 | ||
89 | /* Cached wakeup: we hold a reference to this task. */ | |
90 | struct task_struct *wake; | |
91 | ||
92 | unsigned long noirq_start, noirq_end; | |
93 | int dma_is_pending; | |
94 | unsigned long pending_dma; /* struct lguest_dma */ | |
95 | unsigned long pending_key; /* address they're sending to */ | |
96 | ||
97 | unsigned int stack_pages; | |
98 | u32 tsc_khz; | |
99 | ||
100 | struct lguest_dma_info dma[LGUEST_MAX_DMA]; | |
101 | ||
102 | /* Dead? */ | |
103 | const char *dead; | |
104 | ||
625efab1 | 105 | struct lguest_arch arch; |
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106 | |
107 | /* Virtual clock device */ | |
108 | struct hrtimer hrt; | |
109 | ||
110 | /* Pending virtual interrupts */ | |
111 | DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); | |
112 | }; | |
113 | ||
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114 | extern struct mutex lguest_lock; |
115 | ||
116 | /* core.c: */ | |
117 | u32 lgread_u32(struct lguest *lg, unsigned long addr); | |
118 | void lgwrite_u32(struct lguest *lg, unsigned long addr, u32 val); | |
119 | void lgread(struct lguest *lg, void *buf, unsigned long addr, unsigned len); | |
120 | void lgwrite(struct lguest *lg, unsigned long, const void *buf, unsigned len); | |
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121 | int lguest_address_ok(const struct lguest *lg, |
122 | unsigned long addr, unsigned long len); | |
123 | int run_guest(struct lguest *lg, unsigned long __user *user); | |
124 | ||
df29f43e MZ |
125 | /* Helper macros to obtain the first 12 or the last 20 bits, this is only the |
126 | * first step in the migration to the kernel types. pte_pfn is already defined | |
127 | * in the kernel. */ | |
128 | #define pgd_flags(x) (pgd_val(x) & ~PAGE_MASK) | |
129 | #define pte_flags(x) (pte_val(x) & ~PAGE_MASK) | |
130 | #define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT) | |
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131 | |
132 | /* interrupts_and_traps.c: */ | |
133 | void maybe_do_interrupt(struct lguest *lg); | |
134 | int deliver_trap(struct lguest *lg, unsigned int num); | |
135 | void load_guest_idt_entry(struct lguest *lg, unsigned int i, u32 low, u32 hi); | |
136 | void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages); | |
137 | void pin_stack_pages(struct lguest *lg); | |
138 | void setup_default_idt_entries(struct lguest_ro_state *state, | |
139 | const unsigned long *def); | |
140 | void copy_traps(const struct lguest *lg, struct desc_struct *idt, | |
141 | const unsigned long *def); | |
142 | void guest_set_clockevent(struct lguest *lg, unsigned long delta); | |
143 | void init_clockdev(struct lguest *lg); | |
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144 | bool check_syscall_vector(struct lguest *lg); |
145 | int init_interrupts(void); | |
146 | void free_interrupts(void); | |
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147 | |
148 | /* segments.c: */ | |
149 | void setup_default_gdt_entries(struct lguest_ro_state *state); | |
150 | void setup_guest_gdt(struct lguest *lg); | |
151 | void load_guest_gdt(struct lguest *lg, unsigned long table, u32 num); | |
152 | void guest_load_tls(struct lguest *lg, unsigned long tls_array); | |
153 | void copy_gdt(const struct lguest *lg, struct desc_struct *gdt); | |
154 | void copy_gdt_tls(const struct lguest *lg, struct desc_struct *gdt); | |
155 | ||
156 | /* page_tables.c: */ | |
157 | int init_guest_pagetable(struct lguest *lg, unsigned long pgtable); | |
158 | void free_guest_pagetable(struct lguest *lg); | |
159 | void guest_new_pagetable(struct lguest *lg, unsigned long pgtable); | |
ee3db0f2 | 160 | void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i); |
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161 | void guest_pagetable_clear_all(struct lguest *lg); |
162 | void guest_pagetable_flush_user(struct lguest *lg); | |
ee3db0f2 | 163 | void guest_set_pte(struct lguest *lg, unsigned long gpgdir, |
df29f43e | 164 | unsigned long vaddr, pte_t val); |
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165 | void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages); |
166 | int demand_page(struct lguest *info, unsigned long cr2, int errcode); | |
167 | void pin_page(struct lguest *lg, unsigned long vaddr); | |
168 | ||
625efab1 JS |
169 | /* <arch>/core.c: */ |
170 | void lguest_arch_host_init(void); | |
171 | void lguest_arch_host_fini(void); | |
172 | void lguest_arch_run_guest(struct lguest *lg); | |
173 | void lguest_arch_handle_trap(struct lguest *lg); | |
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174 | int lguest_arch_init_hypercalls(struct lguest *lg); |
175 | int lguest_arch_do_hcall(struct lguest *lg, struct hcall_args *args); | |
d612cde0 | 176 | void lguest_arch_setup_regs(struct lguest *lg, unsigned long start); |
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177 | |
178 | /* <arch>/switcher.S: */ | |
179 | extern char start_switcher_text[], end_switcher_text[], switch_to_guest[]; | |
180 | ||
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181 | /* lguest_user.c: */ |
182 | int lguest_device_init(void); | |
183 | void lguest_device_remove(void); | |
184 | ||
185 | /* io.c: */ | |
186 | void lguest_io_init(void); | |
187 | int bind_dma(struct lguest *lg, | |
188 | unsigned long key, unsigned long udma, u16 numdmas, u8 interrupt); | |
189 | void send_dma(struct lguest *info, unsigned long key, unsigned long udma); | |
190 | void release_all_dma(struct lguest *lg); | |
191 | unsigned long get_dma_buffer(struct lguest *lg, unsigned long key, | |
192 | unsigned long *interrupt); | |
193 | ||
194 | /* hypercalls.c: */ | |
195 | void do_hypercalls(struct lguest *lg); | |
6c8dca5d | 196 | void write_timestamp(struct lguest *lg); |
d7e28ffe | 197 | |
dde79789 RR |
198 | /*L:035 |
199 | * Let's step aside for the moment, to study one important routine that's used | |
200 | * widely in the Host code. | |
201 | * | |
202 | * There are many cases where the Guest does something invalid, like pass crap | |
203 | * to a hypercall. Since only the Guest kernel can make hypercalls, it's quite | |
204 | * acceptable to simply terminate the Guest and give the Launcher a nicely | |
205 | * formatted reason. It's also simpler for the Guest itself, which doesn't | |
206 | * need to check most hypercalls for "success"; if you're still running, it | |
207 | * succeeded. | |
208 | * | |
209 | * Once this is called, the Guest will never run again, so most Host code can | |
210 | * call this then continue as if nothing had happened. This means many | |
211 | * functions don't have to explicitly return an error code, which keeps the | |
212 | * code simple. | |
213 | * | |
214 | * It also means that this can be called more than once: only the first one is | |
215 | * remembered. The only trick is that we still need to kill the Guest even if | |
216 | * we can't allocate memory to store the reason. Linux has a neat way of | |
217 | * packing error codes into invalid pointers, so we use that here. | |
218 | * | |
219 | * Like any macro which uses an "if", it is safely wrapped in a run-once "do { | |
220 | * } while(0)". | |
221 | */ | |
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222 | #define kill_guest(lg, fmt...) \ |
223 | do { \ | |
224 | if (!(lg)->dead) { \ | |
225 | (lg)->dead = kasprintf(GFP_ATOMIC, fmt); \ | |
226 | if (!(lg)->dead) \ | |
227 | (lg)->dead = ERR_PTR(-ENOMEM); \ | |
228 | } \ | |
229 | } while(0) | |
dde79789 | 230 | /* (End of aside) :*/ |
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231 | |
232 | static inline unsigned long guest_pa(struct lguest *lg, unsigned long vaddr) | |
233 | { | |
234 | return vaddr - lg->page_offset; | |
235 | } | |
236 | #endif /* __ASSEMBLY__ */ | |
237 | #endif /* _LGUEST_H */ |