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d7e28ffe RR |
1 | #ifndef _LGUEST_H |
2 | #define _LGUEST_H | |
3 | ||
d7e28ffe RR |
4 | #ifndef __ASSEMBLY__ |
5 | #include <linux/types.h> | |
6 | #include <linux/init.h> | |
7 | #include <linux/stringify.h> | |
d7e28ffe RR |
8 | #include <linux/lguest.h> |
9 | #include <linux/lguest_launcher.h> | |
10 | #include <linux/wait.h> | |
ca94f2bd | 11 | #include <linux/hrtimer.h> |
d7e28ffe | 12 | #include <linux/err.h> |
d7e28ffe | 13 | |
625efab1 | 14 | #include <asm/lguest.h> |
d7e28ffe RR |
15 | |
16 | void free_pagetables(void); | |
17 | int init_pagetables(struct page **switcher_page, unsigned int pages); | |
18 | ||
d7e28ffe RR |
19 | struct pgdir |
20 | { | |
ee3db0f2 | 21 | unsigned long gpgdir; |
df29f43e | 22 | pgd_t *pgdir; |
d7e28ffe RR |
23 | }; |
24 | ||
d7e28ffe RR |
25 | /* We have two pages shared with guests, per cpu. */ |
26 | struct lguest_pages | |
27 | { | |
28 | /* This is the stack page mapped rw in guest */ | |
29 | char spare[PAGE_SIZE - sizeof(struct lguest_regs)]; | |
30 | struct lguest_regs regs; | |
31 | ||
32 | /* This is the host state & guest descriptor page, ro in guest */ | |
33 | struct lguest_ro_state state; | |
34 | } __attribute__((aligned(PAGE_SIZE))); | |
35 | ||
36 | #define CHANGED_IDT 1 | |
37 | #define CHANGED_GDT 2 | |
38 | #define CHANGED_GDT_TLS 4 /* Actually a subset of CHANGED_GDT */ | |
39 | #define CHANGED_ALL 3 | |
40 | ||
badb1e04 GOC |
41 | struct lguest; |
42 | ||
43 | struct lg_cpu { | |
44 | unsigned int id; | |
45 | struct lguest *lg; | |
66686c2a GOC |
46 | struct task_struct *tsk; |
47 | struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */ | |
73044f05 | 48 | |
4665ac8e GOC |
49 | u32 cr2; |
50 | int ts; | |
51 | u32 esp1; | |
f086122b | 52 | u16 ss1; |
4665ac8e | 53 | |
ae3749dc GOC |
54 | /* Bitmap of what has changed: see CHANGED_* above. */ |
55 | int changed; | |
56 | ||
5e232f4f GOC |
57 | unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */ |
58 | ||
a53a35a8 GOC |
59 | /* At end of a page shared mapped over lguest_pages in guest. */ |
60 | unsigned long regs_page; | |
61 | struct lguest_regs *regs; | |
62 | ||
f34f8c5f GOC |
63 | struct lguest_pages *last_pages; |
64 | ||
1713608f GOC |
65 | int cpu_pgd; /* which pgd this cpu is currently using */ |
66 | ||
73044f05 GOC |
67 | /* If a hypercall was asked for, this points to the arguments. */ |
68 | struct hcall_args *hcall; | |
69 | u32 next_hcall; | |
ad8d8f3b GOC |
70 | |
71 | /* Virtual clock device */ | |
72 | struct hrtimer hrt; | |
177e449d | 73 | |
5dac051b | 74 | /* Did the Guest tell us to halt? */ |
66686c2a GOC |
75 | int halted; |
76 | ||
177e449d GOC |
77 | /* Pending virtual interrupts */ |
78 | DECLARE_BITMAP(irqs_pending, LGUEST_IRQS); | |
fc708b3e GOC |
79 | |
80 | struct lg_cpu_arch arch; | |
badb1e04 GOC |
81 | }; |
82 | ||
df60aeef RR |
83 | struct lg_eventfd { |
84 | unsigned long addr; | |
85 | struct file *event; | |
86 | }; | |
87 | ||
88 | struct lg_eventfd_map { | |
89 | unsigned int num; | |
90 | struct lg_eventfd map[]; | |
91 | }; | |
92 | ||
d7e28ffe RR |
93 | /* The private info the thread maintains about the guest. */ |
94 | struct lguest | |
95 | { | |
d7e28ffe | 96 | struct lguest_data __user *lguest_data; |
badb1e04 GOC |
97 | struct lg_cpu cpus[NR_CPUS]; |
98 | unsigned int nr_cpus; | |
99 | ||
d7e28ffe | 100 | u32 pfn_limit; |
3c6b5bfa RR |
101 | /* This provides the offset to the base of guest-physical |
102 | * memory in the Launcher. */ | |
103 | void __user *mem_base; | |
47436aa4 | 104 | unsigned long kernel_address; |
d7e28ffe | 105 | |
d7e28ffe RR |
106 | struct pgdir pgdirs[4]; |
107 | ||
d7e28ffe | 108 | unsigned long noirq_start, noirq_end; |
d7e28ffe RR |
109 | |
110 | unsigned int stack_pages; | |
111 | u32 tsc_khz; | |
112 | ||
df60aeef RR |
113 | struct lg_eventfd_map *eventfds; |
114 | ||
d7e28ffe RR |
115 | /* Dead? */ |
116 | const char *dead; | |
d7e28ffe RR |
117 | }; |
118 | ||
d7e28ffe RR |
119 | extern struct mutex lguest_lock; |
120 | ||
121 | /* core.c: */ | |
df1693ab MZ |
122 | bool lguest_address_ok(const struct lguest *lg, |
123 | unsigned long addr, unsigned long len); | |
382ac6b3 GOC |
124 | void __lgread(struct lg_cpu *, void *, unsigned long, unsigned); |
125 | void __lgwrite(struct lg_cpu *, unsigned long, const void *, unsigned); | |
2d37f94a | 126 | |
e1e72965 | 127 | /*H:035 Using memory-copy operations like that is usually inconvient, so we |
2d37f94a RR |
128 | * have the following helper macros which read and write a specific type (often |
129 | * an unsigned long). | |
130 | * | |
131 | * This reads into a variable of the given type then returns that. */ | |
382ac6b3 GOC |
132 | #define lgread(cpu, addr, type) \ |
133 | ({ type _v; __lgread((cpu), &_v, (addr), sizeof(_v)); _v; }) | |
2d37f94a RR |
134 | |
135 | /* This checks that the variable is of the given type, then writes it out. */ | |
382ac6b3 | 136 | #define lgwrite(cpu, addr, type, val) \ |
2d37f94a RR |
137 | do { \ |
138 | typecheck(type, val); \ | |
382ac6b3 | 139 | __lgwrite((cpu), (addr), &(val), sizeof(val)); \ |
2d37f94a RR |
140 | } while(0) |
141 | /* (end of memory access helper routines) :*/ | |
142 | ||
d0953d42 | 143 | int run_guest(struct lg_cpu *cpu, unsigned long __user *user); |
d7e28ffe | 144 | |
df29f43e MZ |
145 | /* Helper macros to obtain the first 12 or the last 20 bits, this is only the |
146 | * first step in the migration to the kernel types. pte_pfn is already defined | |
147 | * in the kernel. */ | |
148 | #define pgd_flags(x) (pgd_val(x) & ~PAGE_MASK) | |
df29f43e | 149 | #define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT) |
acdd0b62 MZ |
150 | #define pmd_flags(x) (pmd_val(x) & ~PAGE_MASK) |
151 | #define pmd_pfn(x) (pmd_val(x) >> PAGE_SHIFT) | |
d7e28ffe RR |
152 | |
153 | /* interrupts_and_traps.c: */ | |
a32a8813 RR |
154 | unsigned int interrupt_pending(struct lg_cpu *cpu, bool *more); |
155 | void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more); | |
9f155a9b | 156 | void set_interrupt(struct lg_cpu *cpu, unsigned int irq); |
df1693ab | 157 | bool deliver_trap(struct lg_cpu *cpu, unsigned int num); |
fc708b3e GOC |
158 | void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i, |
159 | u32 low, u32 hi); | |
4665ac8e GOC |
160 | void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages); |
161 | void pin_stack_pages(struct lg_cpu *cpu); | |
d7e28ffe RR |
162 | void setup_default_idt_entries(struct lguest_ro_state *state, |
163 | const unsigned long *def); | |
fc708b3e | 164 | void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt, |
d7e28ffe | 165 | const unsigned long *def); |
ad8d8f3b | 166 | void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta); |
df60aeef | 167 | bool send_notify_to_eventfd(struct lg_cpu *cpu); |
ad8d8f3b | 168 | void init_clockdev(struct lg_cpu *cpu); |
c18acd73 RR |
169 | bool check_syscall_vector(struct lguest *lg); |
170 | int init_interrupts(void); | |
171 | void free_interrupts(void); | |
d7e28ffe RR |
172 | |
173 | /* segments.c: */ | |
174 | void setup_default_gdt_entries(struct lguest_ro_state *state); | |
fc708b3e | 175 | void setup_guest_gdt(struct lg_cpu *cpu); |
a489f0b5 RR |
176 | void load_guest_gdt_entry(struct lg_cpu *cpu, unsigned int i, |
177 | u32 low, u32 hi); | |
fc708b3e GOC |
178 | void guest_load_tls(struct lg_cpu *cpu, unsigned long tls_array); |
179 | void copy_gdt(const struct lg_cpu *cpu, struct desc_struct *gdt); | |
180 | void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt); | |
d7e28ffe RR |
181 | |
182 | /* page_tables.c: */ | |
58a24566 | 183 | int init_guest_pagetable(struct lguest *lg); |
d7e28ffe | 184 | void free_guest_pagetable(struct lguest *lg); |
4665ac8e | 185 | void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable); |
ebe0ba84 | 186 | void guest_set_pgd(struct lguest *lg, unsigned long gpgdir, u32 i); |
acdd0b62 MZ |
187 | #ifdef CONFIG_X86_PAE |
188 | void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i); | |
189 | #endif | |
4665ac8e | 190 | void guest_pagetable_clear_all(struct lg_cpu *cpu); |
1713608f | 191 | void guest_pagetable_flush_user(struct lg_cpu *cpu); |
382ac6b3 | 192 | void guest_set_pte(struct lg_cpu *cpu, unsigned long gpgdir, |
df29f43e | 193 | unsigned long vaddr, pte_t val); |
0c78441c | 194 | void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages); |
df1693ab | 195 | bool demand_page(struct lg_cpu *cpu, unsigned long cr2, int errcode); |
1713608f GOC |
196 | void pin_page(struct lg_cpu *cpu, unsigned long vaddr); |
197 | unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr); | |
382ac6b3 | 198 | void page_table_guest_data_init(struct lg_cpu *cpu); |
d7e28ffe | 199 | |
625efab1 JS |
200 | /* <arch>/core.c: */ |
201 | void lguest_arch_host_init(void); | |
202 | void lguest_arch_host_fini(void); | |
d0953d42 | 203 | void lguest_arch_run_guest(struct lg_cpu *cpu); |
73044f05 GOC |
204 | void lguest_arch_handle_trap(struct lg_cpu *cpu); |
205 | int lguest_arch_init_hypercalls(struct lg_cpu *cpu); | |
206 | int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args); | |
a53a35a8 | 207 | void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start); |
625efab1 JS |
208 | |
209 | /* <arch>/switcher.S: */ | |
210 | extern char start_switcher_text[], end_switcher_text[], switch_to_guest[]; | |
211 | ||
d7e28ffe RR |
212 | /* lguest_user.c: */ |
213 | int lguest_device_init(void); | |
214 | void lguest_device_remove(void); | |
215 | ||
d7e28ffe | 216 | /* hypercalls.c: */ |
73044f05 | 217 | void do_hypercalls(struct lg_cpu *cpu); |
382ac6b3 | 218 | void write_timestamp(struct lg_cpu *cpu); |
d7e28ffe | 219 | |
dde79789 RR |
220 | /*L:035 |
221 | * Let's step aside for the moment, to study one important routine that's used | |
222 | * widely in the Host code. | |
223 | * | |
e1e72965 | 224 | * There are many cases where the Guest can do something invalid, like pass crap |
dde79789 RR |
225 | * to a hypercall. Since only the Guest kernel can make hypercalls, it's quite |
226 | * acceptable to simply terminate the Guest and give the Launcher a nicely | |
227 | * formatted reason. It's also simpler for the Guest itself, which doesn't | |
228 | * need to check most hypercalls for "success"; if you're still running, it | |
229 | * succeeded. | |
230 | * | |
231 | * Once this is called, the Guest will never run again, so most Host code can | |
232 | * call this then continue as if nothing had happened. This means many | |
233 | * functions don't have to explicitly return an error code, which keeps the | |
234 | * code simple. | |
235 | * | |
236 | * It also means that this can be called more than once: only the first one is | |
237 | * remembered. The only trick is that we still need to kill the Guest even if | |
238 | * we can't allocate memory to store the reason. Linux has a neat way of | |
239 | * packing error codes into invalid pointers, so we use that here. | |
240 | * | |
241 | * Like any macro which uses an "if", it is safely wrapped in a run-once "do { | |
242 | * } while(0)". | |
243 | */ | |
382ac6b3 | 244 | #define kill_guest(cpu, fmt...) \ |
d7e28ffe | 245 | do { \ |
382ac6b3 GOC |
246 | if (!(cpu)->lg->dead) { \ |
247 | (cpu)->lg->dead = kasprintf(GFP_ATOMIC, fmt); \ | |
248 | if (!(cpu)->lg->dead) \ | |
249 | (cpu)->lg->dead = ERR_PTR(-ENOMEM); \ | |
d7e28ffe RR |
250 | } \ |
251 | } while(0) | |
dde79789 | 252 | /* (End of aside) :*/ |
d7e28ffe | 253 | |
d7e28ffe RR |
254 | #endif /* __ASSEMBLY__ */ |
255 | #endif /* _LGUEST_H */ |