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#ifndef _LGUEST_H

#define _LGUEST_H

#ifndef __ASSEMBLY__

#include <linux/types.h>

#include <linux/init.h>

#include <linux/stringify.h>

#include <linux/lguest.h>

#include <linux/lguest_launcher.h>

#include <linux/wait.h>

#include <linux/err.h>

#include <asm/semaphore.h>

#include <asm/lguest.h>

void free_pagetables(void);

int init_pagetables(struct page **switcher_page, unsigned int pages);

struct pgdir

{

        unsigned long gpgdir;

        pgd_t *pgdir;

};

/* We have two pages shared with guests, per cpu.  */

struct lguest_pages

{

        /* This is the stack page mapped rw in guest */

        char spare[PAGE_SIZE - sizeof(struct lguest_regs)];

        struct lguest_regs regs;

        /* This is the host state & guest descriptor page, ro in guest */

        struct lguest_ro_state state;

} __attribute__((aligned(PAGE_SIZE)));

#define CHANGED_IDT             1

#define CHANGED_GDT             2

#define CHANGED_GDT_TLS         4 /* Actually a subset of CHANGED_GDT */

#define CHANGED_ALL             3

/* The private info the thread maintains about the guest. */

struct lguest

{

        /* At end of a page shared mapped over lguest_pages in guest.  */

        unsigned long regs_page;

        struct lguest_regs *regs;

        struct lguest_data __user *lguest_data;

        struct task_struct *tsk;

        struct mm_struct *mm;   /* == tsk->mm, but that becomes NULL on exit */

        u32 pfn_limit;

        /* This provides the offset to the base of guest-physical

         * memory in the Launcher. */

        void __user *mem_base;

        unsigned long kernel_address;

        u32 cr2;

        int halted;

        int ts;

        u32 next_hcall;

        u32 esp1;

        u8 ss1;

        /* If a hypercall was asked for, this points to the arguments. */

        struct hcall_args *hcall;

        /* Do we need to stop what we're doing and return to userspace? */

        int break_out;

        wait_queue_head_t break_wq;

        /* Bitmap of what has changed: see CHANGED_* above. */

        int changed;

        struct lguest_pages *last_pages;

        /* We keep a small number of these. */

        u32 pgdidx;

        struct pgdir pgdirs[4];

        unsigned long noirq_start, noirq_end;

        unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */

        unsigned int stack_pages;

        u32 tsc_khz;

        /* Dead? */

        const char *dead;

        struct lguest_arch arch;

        /* Virtual clock device */

        struct hrtimer hrt;

        /* Pending virtual interrupts */

        DECLARE_BITMAP(irqs_pending, LGUEST_IRQS);

};

extern struct mutex lguest_lock;

/* core.c: */

int lguest_address_ok(const struct lguest *lg,

                      unsigned long addr, unsigned long len);

void __lgread(struct lguest *, void *, unsigned long, unsigned);

void __lgwrite(struct lguest *, unsigned long, const void *, unsigned);

/*H:035 Using memory-copy operations like that is usually inconvient, so we

 * have the following helper macros which read and write a specific type (often

 * an unsigned long).

 *

 * This reads into a variable of the given type then returns that. */

#define lgread(lg, addr, type)                                          \

        ({ type _v; __lgread((lg), &_v, (addr), sizeof(_v)); _v; })

/* This checks that the variable is of the given type, then writes it out. */

#define lgwrite(lg, addr, type, val)                            \

        do {                                                    \

                typecheck(type, val);                           \

                __lgwrite((lg), (addr), &(val), sizeof(val));   \

        } while(0)

/* (end of memory access helper routines) :*/

int run_guest(struct lguest *lg, unsigned long __user *user);

/* Helper macros to obtain the first 12 or the last 20 bits, this is only the

 * first step in the migration to the kernel types.  pte_pfn is already defined

 * in the kernel. */

#define pgd_flags(x)    (pgd_val(x) & ~PAGE_MASK)

#define pte_flags(x)    (pte_val(x) & ~PAGE_MASK)

#define pgd_pfn(x)      (pgd_val(x) >> PAGE_SHIFT)

/* interrupts_and_traps.c: */

void maybe_do_interrupt(struct lguest *lg);

int deliver_trap(struct lguest *lg, unsigned int num);

void load_guest_idt_entry(struct lguest *lg, unsigned int i, u32 low, u32 hi);

void guest_set_stack(struct lguest *lg, u32 seg, u32 esp, unsigned int pages);

void pin_stack_pages(struct lguest *lg);

void setup_default_idt_entries(struct lguest_ro_state *state,

                               const unsigned long *def);

void copy_traps(const struct lguest *lg, struct desc_struct *idt,

                const unsigned long *def);

void guest_set_clockevent(struct lguest *lg, unsigned long delta);

void init_clockdev(struct lguest *lg);

bool check_syscall_vector(struct lguest *lg);

int init_interrupts(void);

void free_interrupts(void);

/* segments.c: */

void setup_default_gdt_entries(struct lguest_ro_state *state);

void setup_guest_gdt(struct lguest *lg);

void load_guest_gdt(struct lguest *lg, unsigned long table, u32 num);

void guest_load_tls(struct lguest *lg, unsigned long tls_array);

void copy_gdt(const struct lguest *lg, struct desc_struct *gdt);

void copy_gdt_tls(const struct lguest *lg, struct desc_struct *gdt);

/* page_tables.c: */

int init_guest_pagetable(struct lguest *lg, unsigned long pgtable);

void free_guest_pagetable(struct lguest *lg);

void guest_new_pagetable(struct lguest *lg, unsigned long pgtable);

void guest_set_pmd(struct lguest *lg, unsigned long gpgdir, u32 i);

void guest_pagetable_clear_all(struct lguest *lg);

void guest_pagetable_flush_user(struct lguest *lg);

void guest_set_pte(struct lguest *lg, unsigned long gpgdir,

                   unsigned long vaddr, pte_t val);

void map_switcher_in_guest(struct lguest *lg, struct lguest_pages *pages);

int demand_page(struct lguest *info, unsigned long cr2, int errcode);

void pin_page(struct lguest *lg, unsigned long vaddr);

unsigned long guest_pa(struct lguest *lg, unsigned long vaddr);

void page_table_guest_data_init(struct lguest *lg);

/* <arch>/core.c: */

void lguest_arch_host_init(void);

void lguest_arch_host_fini(void);

void lguest_arch_run_guest(struct lguest *lg);

void lguest_arch_handle_trap(struct lguest *lg);

int lguest_arch_init_hypercalls(struct lguest *lg);

int lguest_arch_do_hcall(struct lguest *lg, struct hcall_args *args);

void lguest_arch_setup_regs(struct lguest *lg, unsigned long start);

/* <arch>/switcher.S: */

extern char start_switcher_text[], end_switcher_text[], switch_to_guest[];

/* lguest_user.c: */

int lguest_device_init(void);

void lguest_device_remove(void);

/* hypercalls.c: */

void do_hypercalls(struct lguest *lg);

void write_timestamp(struct lguest *lg);

/*L:035

 * Let's step aside for the moment, to study one important routine that's used

 * widely in the Host code.

 *

 * There are many cases where the Guest can do something invalid, like pass crap

 * to a hypercall.  Since only the Guest kernel can make hypercalls, it's quite

 * acceptable to simply terminate the Guest and give the Launcher a nicely

 * formatted reason.  It's also simpler for the Guest itself, which doesn't

 * need to check most hypercalls for "success"; if you're still running, it

 * succeeded.

 *

 * Once this is called, the Guest will never run again, so most Host code can

 * call this then continue as if nothing had happened.  This means many

 * functions don't have to explicitly return an error code, which keeps the

 * code simple.

 *

 * It also means that this can be called more than once: only the first one is

 * remembered.  The only trick is that we still need to kill the Guest even if

 * we can't allocate memory to store the reason.  Linux has a neat way of

 * packing error codes into invalid pointers, so we use that here.

 *

 * Like any macro which uses an "if", it is safely wrapped in a run-once "do {

 * } while(0)".

 */

#define kill_guest(lg, fmt...)                                  \

do {                                                            \

        if (!(lg)->dead) {                                      \

                (lg)->dead = kasprintf(GFP_ATOMIC, fmt);        \

                if (!(lg)->dead)                                \

                        (lg)->dead = ERR_PTR(-ENOMEM);          \

        }                                                       \

} while(0)

/* (End of aside) :*/

#endif  /* __ASSEMBLY__ */

#endif  /* _LGUEST_H */