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-rw-r--r--drivers/lguest/lg.h261
1 files changed, 261 insertions, 0 deletions
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
new file mode 100644
index 000000000000..3e2ddfbc816e
--- /dev/null
+++ b/drivers/lguest/lg.h
@@ -0,0 +1,261 @@
1#ifndef _LGUEST_H
2#define _LGUEST_H
3
4#include <asm/desc.h>
5
6#define GDT_ENTRY_LGUEST_CS 10
7#define GDT_ENTRY_LGUEST_DS 11
8#define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
9#define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)
10
11#ifndef __ASSEMBLY__
12#include <linux/types.h>
13#include <linux/init.h>
14#include <linux/stringify.h>
15#include <linux/binfmts.h>
16#include <linux/futex.h>
17#include <linux/lguest.h>
18#include <linux/lguest_launcher.h>
19#include <linux/wait.h>
20#include <linux/err.h>
21#include <asm/semaphore.h>
22#include "irq_vectors.h"
23
24#define GUEST_PL 1
25
26struct lguest_regs
27{
28 /* Manually saved part. */
29 unsigned long ebx, ecx, edx;
30 unsigned long esi, edi, ebp;
31 unsigned long gs;
32 unsigned long eax;
33 unsigned long fs, ds, es;
34 unsigned long trapnum, errcode;
35 /* Trap pushed part */
36 unsigned long eip;
37 unsigned long cs;
38 unsigned long eflags;
39 unsigned long esp;
40 unsigned long ss;
41};
42
43void free_pagetables(void);
44int init_pagetables(struct page **switcher_page, unsigned int pages);
45
46/* Full 4G segment descriptors, suitable for CS and DS. */
47#define FULL_EXEC_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9b00})
48#define FULL_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9300})
49
50struct lguest_dma_info
51{
52 struct list_head list;
53 union futex_key key;
54 unsigned long dmas;
55 u16 next_dma;
56 u16 num_dmas;
57 u16 guestid;
58 u8 interrupt; /* 0 when not registered */
59};
60
61/* We have separate types for the guest's ptes & pgds and the shadow ptes &
62 * pgds. Since this host might use three-level pagetables and the guest and
63 * shadow pagetables don't, we can't use the normal pte_t/pgd_t. */
64typedef union {
65 struct { unsigned flags:12, pfn:20; };
66 struct { unsigned long val; } raw;
67} spgd_t;
68typedef union {
69 struct { unsigned flags:12, pfn:20; };
70 struct { unsigned long val; } raw;
71} spte_t;
72typedef union {
73 struct { unsigned flags:12, pfn:20; };
74 struct { unsigned long val; } raw;
75} gpgd_t;
76typedef union {
77 struct { unsigned flags:12, pfn:20; };
78 struct { unsigned long val; } raw;
79} gpte_t;
80#define mkgpte(_val) ((gpte_t){.raw.val = _val})
81#define mkgpgd(_val) ((gpgd_t){.raw.val = _val})
82
83struct pgdir
84{
85 unsigned long cr3;
86 spgd_t *pgdir;
87};
88
89/* This is a guest-specific page (mapped ro) into the guest. */
90struct lguest_ro_state
91{
92 /* Host information we need to restore when we switch back. */
93 u32 host_cr3;
94 struct Xgt_desc_struct host_idt_desc;
95 struct Xgt_desc_struct host_gdt_desc;
96 u32 host_sp;
97
98 /* Fields which are used when guest is running. */
99 struct Xgt_desc_struct guest_idt_desc;
100 struct Xgt_desc_struct guest_gdt_desc;
101 struct i386_hw_tss guest_tss;
102 struct desc_struct guest_idt[IDT_ENTRIES];
103 struct desc_struct guest_gdt[GDT_ENTRIES];
104};
105
106/* We have two pages shared with guests, per cpu. */
107struct lguest_pages
108{
109 /* This is the stack page mapped rw in guest */
110 char spare[PAGE_SIZE - sizeof(struct lguest_regs)];
111 struct lguest_regs regs;
112
113 /* This is the host state & guest descriptor page, ro in guest */
114 struct lguest_ro_state state;
115} __attribute__((aligned(PAGE_SIZE)));
116
117#define CHANGED_IDT 1
118#define CHANGED_GDT 2
119#define CHANGED_GDT_TLS 4 /* Actually a subset of CHANGED_GDT */
120#define CHANGED_ALL 3
121
122/* The private info the thread maintains about the guest. */
123struct lguest
124{
125 /* At end of a page shared mapped over lguest_pages in guest. */
126 unsigned long regs_page;
127 struct lguest_regs *regs;
128 struct lguest_data __user *lguest_data;
129 struct task_struct *tsk;
130 struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */
131 u16 guestid;
132 u32 pfn_limit;
133 u32 page_offset;
134 u32 cr2;
135 int halted;
136 int ts;
137 u32 next_hcall;
138 u32 esp1;
139 u8 ss1;
140
141 /* Do we need to stop what we're doing and return to userspace? */
142 int break_out;
143 wait_queue_head_t break_wq;
144
145 /* Bitmap of what has changed: see CHANGED_* above. */
146 int changed;
147 struct lguest_pages *last_pages;
148
149 /* We keep a small number of these. */
150 u32 pgdidx;
151 struct pgdir pgdirs[4];
152
153 /* Cached wakeup: we hold a reference to this task. */
154 struct task_struct *wake;
155
156 unsigned long noirq_start, noirq_end;
157 int dma_is_pending;
158 unsigned long pending_dma; /* struct lguest_dma */
159 unsigned long pending_key; /* address they're sending to */
160
161 unsigned int stack_pages;
162 u32 tsc_khz;
163
164 struct lguest_dma_info dma[LGUEST_MAX_DMA];
165
166 /* Dead? */
167 const char *dead;
168
169 /* The GDT entries copied into lguest_ro_state when running. */
170 struct desc_struct gdt[GDT_ENTRIES];
171
172 /* The IDT entries: some copied into lguest_ro_state when running. */
173 struct desc_struct idt[FIRST_EXTERNAL_VECTOR+LGUEST_IRQS];
174 struct desc_struct syscall_idt;
175
176 /* Virtual clock device */
177 struct hrtimer hrt;
178
179 /* Pending virtual interrupts */
180 DECLARE_BITMAP(irqs_pending, LGUEST_IRQS);
181};
182
183extern struct lguest lguests[];
184extern struct mutex lguest_lock;
185
186/* core.c: */
187u32 lgread_u32(struct lguest *lg, unsigned long addr);
188void lgwrite_u32(struct lguest *lg, unsigned long addr, u32 val);
189void lgread(struct lguest *lg, void *buf, unsigned long addr, unsigned len);
190void lgwrite(struct lguest *lg, unsigned long, const void *buf, unsigned len);
191int find_free_guest(void);
192int lguest_address_ok(const struct lguest *lg,
193 unsigned long addr, unsigned long len);
194int run_guest(struct lguest *lg, unsigned long __user *user);
195
196
197/* interrupts_and_traps.c: */
198void maybe_do_interrupt(struct lguest *lg);
199int deliver_trap(struct lguest *lg, unsigned int num);
200void load_guest_idt_entry(struct lguest *lg, unsigned int i, u32 low, u32 hi);
201void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages);
202void pin_stack_pages(struct lguest *lg);
203void setup_default_idt_entries(struct lguest_ro_state *state,
204 const unsigned long *def);
205void copy_traps(const struct lguest *lg, struct desc_struct *idt,
206 const unsigned long *def);
207void guest_set_clockevent(struct lguest *lg, unsigned long delta);
208void init_clockdev(struct lguest *lg);
209
210/* segments.c: */
211void setup_default_gdt_entries(struct lguest_ro_state *state);
212void setup_guest_gdt(struct lguest *lg);
213void load_guest_gdt(struct lguest *lg, unsigned long table, u32 num);
214void guest_load_tls(struct lguest *lg, unsigned long tls_array);
215void copy_gdt(const struct lguest *lg, struct desc_struct *gdt);
216void copy_gdt_tls(const struct lguest *lg, struct desc_struct *gdt);
217
218/* page_tables.c: */
219int init_guest_pagetable(struct lguest *lg, unsigned long pgtable);
220void free_guest_pagetable(struct lguest *lg);
221void guest_new_pagetable(struct lguest *lg, unsigned long pgtable);
222void guest_set_pmd(struct lguest *lg, unsigned long cr3, u32 i);
223void guest_pagetable_clear_all(struct lguest *lg);
224void guest_pagetable_flush_user(struct lguest *lg);
225void guest_set_pte(struct lguest *lg, unsigned long cr3,
226 unsigned long vaddr, gpte_t val);
227void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages);
228int demand_page(struct lguest *info, unsigned long cr2, int errcode);
229void pin_page(struct lguest *lg, unsigned long vaddr);
230
231/* lguest_user.c: */
232int lguest_device_init(void);
233void lguest_device_remove(void);
234
235/* io.c: */
236void lguest_io_init(void);
237int bind_dma(struct lguest *lg,
238 unsigned long key, unsigned long udma, u16 numdmas, u8 interrupt);
239void send_dma(struct lguest *info, unsigned long key, unsigned long udma);
240void release_all_dma(struct lguest *lg);
241unsigned long get_dma_buffer(struct lguest *lg, unsigned long key,
242 unsigned long *interrupt);
243
244/* hypercalls.c: */
245void do_hypercalls(struct lguest *lg);
246
247#define kill_guest(lg, fmt...) \
248do { \
249 if (!(lg)->dead) { \
250 (lg)->dead = kasprintf(GFP_ATOMIC, fmt); \
251 if (!(lg)->dead) \
252 (lg)->dead = ERR_PTR(-ENOMEM); \
253 } \
254} while(0)
255
256static inline unsigned long guest_pa(struct lguest *lg, unsigned long vaddr)
257{
258 return vaddr - lg->page_offset;
259}
260#endif /* __ASSEMBLY__ */
261#endif /* _LGUEST_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 13:58:34 -0500