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Rusty Russelld7e28ff2007-07-19 01:49:23 -07001#ifndef _LGUEST_H
2#define _LGUEST_H
3
Rusty Russelld7e28ff2007-07-19 01:49:23 -07004#ifndef __ASSEMBLY__
5#include <linux/types.h>
6#include <linux/init.h>
7#include <linux/stringify.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -07008#include <linux/lguest.h>
9#include <linux/lguest_launcher.h>
10#include <linux/wait.h>
Glauber de Oliveira Costaca94f2b2008-01-18 23:59:07 -020011#include <linux/hrtimer.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070012#include <linux/err.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090013#include <linux/slab.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070014
Jes Sorensen625efab2007-10-22 11:03:28 +100015#include <asm/lguest.h>
Rusty Russelld7e28ff2007-07-19 01:49:23 -070016
Rusty Russell1842f232009-07-30 16:03:46 -060017struct pgdir {
Rusty Russellee3db0f2007-10-22 11:03:34 +100018 unsigned long gpgdir;
Rusty Russell86935fc2013-04-22 14:10:41 +093019 bool switcher_mapped;
Rusty Russell6d0cda92013-04-22 14:10:41 +093020 int last_host_cpu;
Matias Zabaljaureguidf29f432007-10-22 11:03:33 +100021 pgd_t *pgdir;
Rusty Russelld7e28ff2007-07-19 01:49:23 -070022};
23
Rusty Russelld7e28ff2007-07-19 01:49:23 -070024/* We have two pages shared with guests, per cpu. */
Rusty Russell1842f232009-07-30 16:03:46 -060025struct lguest_pages {
Rusty Russelld7e28ff2007-07-19 01:49:23 -070026 /* This is the stack page mapped rw in guest */
27 char spare[PAGE_SIZE - sizeof(struct lguest_regs)];
28 struct lguest_regs regs;
29
30 /* This is the host state & guest descriptor page, ro in guest */
31 struct lguest_ro_state state;
32} __attribute__((aligned(PAGE_SIZE)));
33
34#define CHANGED_IDT 1
35#define CHANGED_GDT 2
36#define CHANGED_GDT_TLS 4 /* Actually a subset of CHANGED_GDT */
37#define CHANGED_ALL 3
38
Glauber de Oliveira Costabadb1e02008-01-07 11:05:22 -020039struct lg_cpu {
40 unsigned int id;
41 struct lguest *lg;
Glauber de Oliveira Costa66686c22008-01-07 11:05:34 -020042 struct task_struct *tsk;
43 struct mm_struct *mm; /* == tsk->mm, but that becomes NULL on exit */
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -020044
Glauber de Oliveira Costa4665ac8e2008-01-07 11:05:35 -020045 u32 cr2;
46 int ts;
47 u32 esp1;
Matias Zabaljaureguif0861222009-06-12 22:27:04 -060048 u16 ss1;
Glauber de Oliveira Costa4665ac8e2008-01-07 11:05:35 -020049
Glauber de Oliveira Costaae3749d2008-01-17 19:14:46 -020050 /* Bitmap of what has changed: see CHANGED_* above. */
51 int changed;
52
Rusty Russell69a09dc2015-02-11 15:15:09 +103053 /* Pending operation. */
54 struct lguest_pending pending;
Glauber de Oliveira Costa5e232f42008-01-07 11:05:36 -020055
Rusty Russell18c13732015-02-11 15:15:09 +103056 unsigned long *reg_read; /* register from LHREQ_GETREG */
57
Rusty Russell2e04ef72009-07-30 16:03:45 -060058 /* At end of a page shared mapped over lguest_pages in guest. */
Glauber de Oliveira Costaa53a35a2008-01-07 11:05:32 -020059 unsigned long regs_page;
60 struct lguest_regs *regs;
61
Glauber de Oliveira Costaf34f8c52008-01-17 19:13:26 -020062 struct lguest_pages *last_pages;
63
Rusty Russell5dea1c82011-07-22 14:39:48 +093064 /* Initialization mode: linear map everything. */
65 bool linear_pages;
Rusty Russell2e04ef72009-07-30 16:03:45 -060066 int cpu_pgd; /* Which pgd this cpu is currently using */
Glauber de Oliveira Costa17136082008-01-07 11:05:37 -020067
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -020068 /* If a hypercall was asked for, this points to the arguments. */
69 struct hcall_args *hcall;
70 u32 next_hcall;
Glauber de Oliveira Costaad8d8f32008-01-07 11:05:28 -020071
72 /* Virtual clock device */
73 struct hrtimer hrt;
Glauber de Oliveira Costa177e4492008-01-07 11:05:29 -020074
Rusty Russell5dac0512009-06-12 22:27:10 -060075 /* Did the Guest tell us to halt? */
Glauber de Oliveira Costa66686c22008-01-07 11:05:34 -020076 int halted;
77
Glauber de Oliveira Costa177e4492008-01-07 11:05:29 -020078 /* Pending virtual interrupts */
79 DECLARE_BITMAP(irqs_pending, LGUEST_IRQS);
Glauber de Oliveira Costafc708b32008-01-07 11:05:33 -020080
81 struct lg_cpu_arch arch;
Glauber de Oliveira Costabadb1e02008-01-07 11:05:22 -020082};
83
Rusty Russelld7e28ff2007-07-19 01:49:23 -070084/* The private info the thread maintains about the guest. */
Rusty Russell1842f232009-07-30 16:03:46 -060085struct lguest {
Rusty Russelld7e28ff2007-07-19 01:49:23 -070086 struct lguest_data __user *lguest_data;
Glauber de Oliveira Costabadb1e02008-01-07 11:05:22 -020087 struct lg_cpu cpus[NR_CPUS];
88 unsigned int nr_cpus;
89
Rusty Russell7313d522015-02-11 15:15:10 +103090 /* Valid guest memory pages must be < this. */
Rusty Russelld7e28ff2007-07-19 01:49:23 -070091 u32 pfn_limit;
Rusty Russell2e04ef72009-07-30 16:03:45 -060092
Rusty Russell7313d522015-02-11 15:15:10 +103093 /* Device memory is >= pfn_limit and < device_limit. */
94 u32 device_limit;
95
Rusty Russell2e04ef72009-07-30 16:03:45 -060096 /*
97 * This provides the offset to the base of guest-physical memory in the
98 * Launcher.
99 */
Rusty Russell3c6b5bf2007-10-22 11:03:26 +1000100 void __user *mem_base;
Rusty Russell47436aa2007-10-22 11:03:36 +1000101 unsigned long kernel_address;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700102
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700103 struct pgdir pgdirs[4];
104
Rusty Russell2f921b52015-03-24 11:51:39 +1030105 unsigned long noirq_iret;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700106
107 unsigned int stack_pages;
108 u32 tsc_khz;
109
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700110 /* Dead? */
111 const char *dead;
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700112};
113
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700114extern struct mutex lguest_lock;
115
116/* core.c: */
Matias Zabaljaureguidf1693a2009-03-18 13:38:35 -0300117bool lguest_address_ok(const struct lguest *lg,
118 unsigned long addr, unsigned long len);
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200119void __lgread(struct lg_cpu *, void *, unsigned long, unsigned);
120void __lgwrite(struct lg_cpu *, unsigned long, const void *, unsigned);
Rusty Russellf1f394b2013-04-22 14:10:40 +0930121extern struct page **lg_switcher_pages;
Rusty Russell2d37f942007-10-22 11:24:24 +1000122
Rusty Russell2e04ef72009-07-30 16:03:45 -0600123/*H:035
124 * Using memory-copy operations like that is usually inconvient, so we
Rusty Russell2d37f942007-10-22 11:24:24 +1000125 * have the following helper macros which read and write a specific type (often
126 * an unsigned long).
127 *
Rusty Russell2e04ef72009-07-30 16:03:45 -0600128 * This reads into a variable of the given type then returns that.
129 */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200130#define lgread(cpu, addr, type) \
131 ({ type _v; __lgread((cpu), &_v, (addr), sizeof(_v)); _v; })
Rusty Russell2d37f942007-10-22 11:24:24 +1000132
133/* This checks that the variable is of the given type, then writes it out. */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200134#define lgwrite(cpu, addr, type, val) \
Rusty Russell2d37f942007-10-22 11:24:24 +1000135 do { \
136 typecheck(type, val); \
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200137 __lgwrite((cpu), (addr), &(val), sizeof(val)); \
Rusty Russell2d37f942007-10-22 11:24:24 +1000138 } while(0)
139/* (end of memory access helper routines) :*/
140
Glauber de Oliveira Costad0953d42008-01-07 11:05:25 -0200141int run_guest(struct lg_cpu *cpu, unsigned long __user *user);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700142
Rusty Russell2e04ef72009-07-30 16:03:45 -0600143/*
144 * Helper macros to obtain the first 12 or the last 20 bits, this is only the
Matias Zabaljaureguidf29f432007-10-22 11:03:33 +1000145 * first step in the migration to the kernel types. pte_pfn is already defined
Rusty Russell2e04ef72009-07-30 16:03:45 -0600146 * in the kernel.
147 */
Matias Zabaljaureguidf29f432007-10-22 11:03:33 +1000148#define pgd_flags(x) (pgd_val(x) & ~PAGE_MASK)
Matias Zabaljaureguidf29f432007-10-22 11:03:33 +1000149#define pgd_pfn(x) (pgd_val(x) >> PAGE_SHIFT)
Matias Zabaljaureguiacdd0b62009-06-12 22:27:07 -0600150#define pmd_flags(x) (pmd_val(x) & ~PAGE_MASK)
151#define pmd_pfn(x) (pmd_val(x) >> PAGE_SHIFT)
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700152
153/* interrupts_and_traps.c: */
Rusty Russella32a88132009-06-12 22:27:02 -0600154unsigned int interrupt_pending(struct lg_cpu *cpu, bool *more);
155void try_deliver_interrupt(struct lg_cpu *cpu, unsigned int irq, bool more);
Rusty Russell9f155a92009-06-12 22:27:08 -0600156void set_interrupt(struct lg_cpu *cpu, unsigned int irq);
Matias Zabaljaureguidf1693a2009-03-18 13:38:35 -0300157bool deliver_trap(struct lg_cpu *cpu, unsigned int num);
Glauber de Oliveira Costafc708b32008-01-07 11:05:33 -0200158void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int i,
159 u32 low, u32 hi);
Glauber de Oliveira Costa4665ac8e2008-01-07 11:05:35 -0200160void guest_set_stack(struct lg_cpu *cpu, u32 seg, u32 esp, unsigned int pages);
161void pin_stack_pages(struct lg_cpu *cpu);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700162void setup_default_idt_entries(struct lguest_ro_state *state,
163 const unsigned long *def);
Glauber de Oliveira Costafc708b32008-01-07 11:05:33 -0200164void copy_traps(const struct lg_cpu *cpu, struct desc_struct *idt,
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700165 const unsigned long *def);
Glauber de Oliveira Costaad8d8f32008-01-07 11:05:28 -0200166void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta);
Rusty Russelldf60aee2009-06-12 22:27:09 -0600167bool send_notify_to_eventfd(struct lg_cpu *cpu);
Glauber de Oliveira Costaad8d8f32008-01-07 11:05:28 -0200168void init_clockdev(struct lg_cpu *cpu);
Rusty Russellc18acd72007-10-22 11:03:35 +1000169bool check_syscall_vector(struct lguest *lg);
Rusty Russellf87e0432016-04-01 12:15:46 +1030170bool could_be_syscall(unsigned int num);
Rusty Russellc18acd72007-10-22 11:03:35 +1000171int init_interrupts(void);
172void free_interrupts(void);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700173
174/* segments.c: */
175void setup_default_gdt_entries(struct lguest_ro_state *state);
Glauber de Oliveira Costafc708b32008-01-07 11:05:33 -0200176void setup_guest_gdt(struct lg_cpu *cpu);
Rusty Russella489f0b2009-04-19 23:14:00 -0600177void load_guest_gdt_entry(struct lg_cpu *cpu, unsigned int i,
178 u32 low, u32 hi);
Glauber de Oliveira Costafc708b32008-01-07 11:05:33 -0200179void guest_load_tls(struct lg_cpu *cpu, unsigned long tls_array);
180void copy_gdt(const struct lg_cpu *cpu, struct desc_struct *gdt);
181void copy_gdt_tls(const struct lg_cpu *cpu, struct desc_struct *gdt);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700182
183/* page_tables.c: */
Matias Zabaljauregui58a24562008-09-29 01:40:07 -0300184int init_guest_pagetable(struct lguest *lg);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700185void free_guest_pagetable(struct lguest *lg);
Glauber de Oliveira Costa4665ac8e2008-01-07 11:05:35 -0200186void guest_new_pagetable(struct lg_cpu *cpu, unsigned long pgtable);
Matias Zabaljaureguiebe0ba82009-05-30 15:48:08 -0300187void guest_set_pgd(struct lguest *lg, unsigned long gpgdir, u32 i);
Matias Zabaljaureguiacdd0b62009-06-12 22:27:07 -0600188#ifdef CONFIG_X86_PAE
189void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i);
190#endif
Glauber de Oliveira Costa4665ac8e2008-01-07 11:05:35 -0200191void guest_pagetable_clear_all(struct lg_cpu *cpu);
Glauber de Oliveira Costa17136082008-01-07 11:05:37 -0200192void guest_pagetable_flush_user(struct lg_cpu *cpu);
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200193void guest_set_pte(struct lg_cpu *cpu, unsigned long gpgdir,
Matias Zabaljaureguidf29f432007-10-22 11:03:33 +1000194 unsigned long vaddr, pte_t val);
Glauber de Oliveira Costa0c784412008-01-07 11:05:30 -0200195void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages);
Rusty Russell7313d522015-02-11 15:15:10 +1030196bool demand_page(struct lg_cpu *cpu, unsigned long cr2, int errcode,
197 unsigned long *iomem);
Glauber de Oliveira Costa17136082008-01-07 11:05:37 -0200198void pin_page(struct lg_cpu *cpu, unsigned long vaddr);
Rusty Russellc9e433e2015-02-11 15:15:09 +1030199bool __guest_pa(struct lg_cpu *cpu, unsigned long vaddr, unsigned long *paddr);
Glauber de Oliveira Costa17136082008-01-07 11:05:37 -0200200unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr);
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200201void page_table_guest_data_init(struct lg_cpu *cpu);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700202
Jes Sorensen625efab2007-10-22 11:03:28 +1000203/* <arch>/core.c: */
204void lguest_arch_host_init(void);
205void lguest_arch_host_fini(void);
Glauber de Oliveira Costad0953d42008-01-07 11:05:25 -0200206void lguest_arch_run_guest(struct lg_cpu *cpu);
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -0200207void lguest_arch_handle_trap(struct lg_cpu *cpu);
208int lguest_arch_init_hypercalls(struct lg_cpu *cpu);
209int lguest_arch_do_hcall(struct lg_cpu *cpu, struct hcall_args *args);
Glauber de Oliveira Costaa53a35a2008-01-07 11:05:32 -0200210void lguest_arch_setup_regs(struct lg_cpu *cpu, unsigned long start);
Rusty Russell18c13732015-02-11 15:15:09 +1030211unsigned long *lguest_arch_regptr(struct lg_cpu *cpu, size_t reg_off, bool any);
Jes Sorensen625efab2007-10-22 11:03:28 +1000212
213/* <arch>/switcher.S: */
214extern char start_switcher_text[], end_switcher_text[], switch_to_guest[];
215
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700216/* lguest_user.c: */
217int lguest_device_init(void);
218void lguest_device_remove(void);
219
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700220/* hypercalls.c: */
Glauber de Oliveira Costa73044f02008-01-07 11:05:27 -0200221void do_hypercalls(struct lg_cpu *cpu);
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200222void write_timestamp(struct lg_cpu *cpu);
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700223
Rusty Russelldde79782007-07-26 10:41:03 -0700224/*L:035
225 * Let's step aside for the moment, to study one important routine that's used
226 * widely in the Host code.
227 *
Rusty Russelle1e72962007-10-25 15:02:50 +1000228 * There are many cases where the Guest can do something invalid, like pass crap
Rusty Russelldde79782007-07-26 10:41:03 -0700229 * 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
233 * succeeded.
234 *
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
238 * code simple.
239 *
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.
244 *
245 * Like any macro which uses an "if", it is safely wrapped in a run-once "do {
246 * } while(0)".
247 */
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200248#define kill_guest(cpu, fmt...) \
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700249do { \
Glauber de Oliveira Costa382ac6b2008-01-17 19:19:42 -0200250 if (!(cpu)->lg->dead) { \
251 (cpu)->lg->dead = kasprintf(GFP_ATOMIC, fmt); \
252 if (!(cpu)->lg->dead) \
253 (cpu)->lg->dead = ERR_PTR(-ENOMEM); \
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700254 } \
255} while(0)
Rusty Russelldde79782007-07-26 10:41:03 -0700256/* (End of aside) :*/
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700257
Rusty Russelld7e28ff2007-07-19 01:49:23 -0700258#endif /* __ASSEMBLY__ */
259#endif /* _LGUEST_H */