5 #include <linux/types.h>
6 #include <linux/init.h>
7 #include <linux/stringify.h>
8 #include <linux/lguest.h>
9 #include <linux/lguest_launcher.h>
10 #include <linux/wait.h>
11 #include <linux/hrtimer.h>
12 #include <linux/err.h>
13 #include <linux/slab.h>
15 #include <asm/lguest.h>
24 /* We have two pages shared with guests, per cpu. */
26 /* This is the stack page mapped rw in guest */
27 char spare
[PAGE_SIZE
- sizeof(struct lguest_regs
)];
28 struct lguest_regs regs
;
30 /* This is the host state & guest descriptor page, ro in guest */
31 struct lguest_ro_state state
;
32 } __attribute__((aligned(PAGE_SIZE
)));
36 #define CHANGED_GDT_TLS 4 /* Actually a subset of CHANGED_GDT */
42 struct task_struct
*tsk
;
43 struct mm_struct
*mm
; /* == tsk->mm, but that becomes NULL on exit */
50 /* Bitmap of what has changed: see CHANGED_* above. */
53 /* Pending operation. */
54 struct lguest_pending pending
;
56 unsigned long *reg_read
; /* register from LHREQ_GETREG */
58 /* At end of a page shared mapped over lguest_pages in guest. */
59 unsigned long regs_page
;
60 struct lguest_regs
*regs
;
62 struct lguest_pages
*last_pages
;
64 /* Initialization mode: linear map everything. */
66 int cpu_pgd
; /* Which pgd this cpu is currently using */
68 /* If a hypercall was asked for, this points to the arguments. */
69 struct hcall_args
*hcall
;
72 /* Virtual clock device */
75 /* Did the Guest tell us to halt? */
78 /* Pending virtual interrupts */
79 DECLARE_BITMAP(irqs_pending
, LGUEST_IRQS
);
81 struct lg_cpu_arch arch
;
84 /* The private info the thread maintains about the guest. */
86 struct lguest_data __user
*lguest_data
;
87 struct lg_cpu cpus
[NR_CPUS
];
90 /* Valid guest memory pages must be < this. */
93 /* Device memory is >= pfn_limit and < device_limit. */
97 * This provides the offset to the base of guest-physical memory in the
100 void __user
*mem_base
;
101 unsigned long kernel_address
;
103 struct pgdir pgdirs
[4];
105 unsigned long noirq_iret
;
107 unsigned int stack_pages
;
114 extern struct mutex lguest_lock
;
117 bool lguest_address_ok(const struct lguest
*lg
,
118 unsigned long addr
, unsigned long len
);
119 void __lgread(struct lg_cpu
*, void *, unsigned long, unsigned);
120 void __lgwrite(struct lg_cpu
*, unsigned long, const void *, unsigned);
121 extern struct page
**lg_switcher_pages
;
124 * Using memory-copy operations like that is usually inconvient, so we
125 * have the following helper macros which read and write a specific type (often
128 * This reads into a variable of the given type then returns that.
130 #define lgread(cpu, addr, type) \
131 ({ type _v; __lgread((cpu), &_v, (addr), sizeof(_v)); _v; })
133 /* This checks that the variable is of the given type, then writes it out. */
134 #define lgwrite(cpu, addr, type, val) \
136 typecheck(type, val); \
137 __lgwrite((cpu), (addr), &(val), sizeof(val)); \
139 /* (end of memory access helper routines) :*/
141 int run_guest(struct lg_cpu
*cpu
, unsigned long __user
*user
);
144 * Helper macros to obtain the first 12 or the last 20 bits, this is only the
145 * first step in the migration to the kernel types. pte_pfn is already defined
148 #define pgd_flags(x) (pgd_val(x) & ~PAGE_MASK)
149 #define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT)
150 #define pmd_flags(x) (pmd_val(x) & ~PAGE_MASK)
151 #define pmd_pfn(x) (pmd_val(x) >> PAGE_SHIFT)
153 /* interrupts_and_traps.c: */
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
);
156 void set_interrupt(struct lg_cpu
*cpu
, unsigned int irq
);
157 bool deliver_trap(struct lg_cpu
*cpu
, unsigned int num
);
158 void load_guest_idt_entry(struct lg_cpu
*cpu
, unsigned int i
,
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
);
162 void setup_default_idt_entries(struct lguest_ro_state
*state
,
163 const unsigned long *def
);
164 void copy_traps(const struct lg_cpu
*cpu
, struct desc_struct
*idt
,
165 const unsigned long *def
);
166 void guest_set_clockevent(struct lg_cpu
*cpu
, unsigned long delta
);
167 bool send_notify_to_eventfd(struct lg_cpu
*cpu
);
168 void init_clockdev(struct lg_cpu
*cpu
);
169 bool check_syscall_vector(struct lguest
*lg
);
170 bool could_be_syscall(unsigned int num
);
171 int init_interrupts(void);
172 void free_interrupts(void);
175 void setup_default_gdt_entries(struct lguest_ro_state
*state
);
176 void setup_guest_gdt(struct lg_cpu
*cpu
);
177 void load_guest_gdt_entry(struct lg_cpu
*cpu
, unsigned int i
,
179 void guest_load_tls(struct lg_cpu
*cpu
, unsigned long tls_array
);
180 void copy_gdt(const struct lg_cpu
*cpu
, struct desc_struct
*gdt
);
181 void copy_gdt_tls(const struct lg_cpu
*cpu
, struct desc_struct
*gdt
);
184 int init_guest_pagetable(struct lguest
*lg
);
185 void free_guest_pagetable(struct lguest
*lg
);
186 void guest_new_pagetable(struct lg_cpu
*cpu
, unsigned long pgtable
);
187 void guest_set_pgd(struct lguest
*lg
, unsigned long gpgdir
, u32 i
);
188 #ifdef CONFIG_X86_PAE
189 void guest_set_pmd(struct lguest
*lg
, unsigned long gpgdir
, u32 i
);
191 void guest_pagetable_clear_all(struct lg_cpu
*cpu
);
192 void guest_pagetable_flush_user(struct lg_cpu
*cpu
);
193 void guest_set_pte(struct lg_cpu
*cpu
, unsigned long gpgdir
,
194 unsigned long vaddr
, pte_t val
);
195 void map_switcher_in_guest(struct lg_cpu
*cpu
, struct lguest_pages
*pages
);
196 bool demand_page(struct lg_cpu
*cpu
, unsigned long cr2
, int errcode
,
197 unsigned long *iomem
);
198 void pin_page(struct lg_cpu
*cpu
, unsigned long vaddr
);
199 bool __guest_pa(struct lg_cpu
*cpu
, unsigned long vaddr
, unsigned long *paddr
);
200 unsigned long guest_pa(struct lg_cpu
*cpu
, unsigned long vaddr
);
201 void page_table_guest_data_init(struct lg_cpu
*cpu
);
204 void lguest_arch_host_init(void);
205 void lguest_arch_host_fini(void);
206 void lguest_arch_run_guest(struct lg_cpu
*cpu
);
207 void lguest_arch_handle_trap(struct lg_cpu
*cpu
);
208 int lguest_arch_init_hypercalls(struct lg_cpu
*cpu
);
209 int lguest_arch_do_hcall(struct lg_cpu
*cpu
, struct hcall_args
*args
);
210 void lguest_arch_setup_regs(struct lg_cpu
*cpu
, unsigned long start
);
211 unsigned long *lguest_arch_regptr(struct lg_cpu
*cpu
, size_t reg_off
, bool any
);
213 /* <arch>/switcher.S: */
214 extern char start_switcher_text
[], end_switcher_text
[], switch_to_guest
[];
217 int lguest_device_init(void);
218 void lguest_device_remove(void);
221 void do_hypercalls(struct lg_cpu
*cpu
);
222 void write_timestamp(struct lg_cpu
*cpu
);
225 * Let's step aside for the moment, to study one important routine that's used
226 * widely in the Host code.
228 * There are many cases where the Guest can do something invalid, like pass crap
229 * to a hypercall. Since only the Guest kernel can make hypercalls, it's quite
230 * acceptable to simply terminate the Guest and give the Launcher a nicely
231 * formatted reason. It's also simpler for the Guest itself, which doesn't
232 * need to check most hypercalls for "success"; if you're still running, it
235 * Once this is called, the Guest will never run again, so most Host code can
236 * call this then continue as if nothing had happened. This means many
237 * functions don't have to explicitly return an error code, which keeps the
240 * It also means that this can be called more than once: only the first one is
241 * remembered. The only trick is that we still need to kill the Guest even if
242 * we can't allocate memory to store the reason. Linux has a neat way of
243 * packing error codes into invalid pointers, so we use that here.
245 * Like any macro which uses an "if", it is safely wrapped in a run-once "do {
248 #define kill_guest(cpu, fmt...) \
250 if (!(cpu)->lg->dead) { \
251 (cpu)->lg->dead = kasprintf(GFP_ATOMIC, fmt); \
252 if (!(cpu)->lg->dead) \
253 (cpu)->lg->dead = ERR_PTR(-ENOMEM); \
256 /* (End of aside) :*/
258 #endif /* __ASSEMBLY__ */
259 #endif /* _LGUEST_H */
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