forked from luck/tmp_suning_uos_patched
bff672e630
Documentation: The Host Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
300 lines
9.4 KiB
C
300 lines
9.4 KiB
C
#ifndef _LGUEST_H
|
|
#define _LGUEST_H
|
|
|
|
#include <asm/desc.h>
|
|
|
|
#define GDT_ENTRY_LGUEST_CS 10
|
|
#define GDT_ENTRY_LGUEST_DS 11
|
|
#define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
|
|
#define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/stringify.h>
|
|
#include <linux/binfmts.h>
|
|
#include <linux/futex.h>
|
|
#include <linux/lguest.h>
|
|
#include <linux/lguest_launcher.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/err.h>
|
|
#include <asm/semaphore.h>
|
|
#include "irq_vectors.h"
|
|
|
|
#define GUEST_PL 1
|
|
|
|
struct lguest_regs
|
|
{
|
|
/* Manually saved part. */
|
|
unsigned long ebx, ecx, edx;
|
|
unsigned long esi, edi, ebp;
|
|
unsigned long gs;
|
|
unsigned long eax;
|
|
unsigned long fs, ds, es;
|
|
unsigned long trapnum, errcode;
|
|
/* Trap pushed part */
|
|
unsigned long eip;
|
|
unsigned long cs;
|
|
unsigned long eflags;
|
|
unsigned long esp;
|
|
unsigned long ss;
|
|
};
|
|
|
|
void free_pagetables(void);
|
|
int init_pagetables(struct page **switcher_page, unsigned int pages);
|
|
|
|
/* Full 4G segment descriptors, suitable for CS and DS. */
|
|
#define FULL_EXEC_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9b00})
|
|
#define FULL_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9300})
|
|
|
|
struct lguest_dma_info
|
|
{
|
|
struct list_head list;
|
|
union futex_key key;
|
|
unsigned long dmas;
|
|
u16 next_dma;
|
|
u16 num_dmas;
|
|
u16 guestid;
|
|
u8 interrupt; /* 0 when not registered */
|
|
};
|
|
|
|
/*H:310 The page-table code owes a great debt of gratitude to Andi Kleen. He
|
|
* reviewed the original code which used "u32" for all page table entries, and
|
|
* insisted that it would be far clearer with explicit typing. I thought it
|
|
* was overkill, but he was right: it is much clearer than it was before.
|
|
*
|
|
* We have separate types for the Guest's ptes & pgds and the shadow ptes &
|
|
* pgds. There's already a Linux type for these (pte_t and pgd_t) but they
|
|
* change depending on kernel config options (PAE). */
|
|
|
|
/* Each entry is identical: lower 12 bits of flags and upper 20 bits for the
|
|
* "page frame number" (0 == first physical page, etc). They are different
|
|
* types so the compiler will warn us if we mix them improperly. */
|
|
typedef union {
|
|
struct { unsigned flags:12, pfn:20; };
|
|
struct { unsigned long val; } raw;
|
|
} spgd_t;
|
|
typedef union {
|
|
struct { unsigned flags:12, pfn:20; };
|
|
struct { unsigned long val; } raw;
|
|
} spte_t;
|
|
typedef union {
|
|
struct { unsigned flags:12, pfn:20; };
|
|
struct { unsigned long val; } raw;
|
|
} gpgd_t;
|
|
typedef union {
|
|
struct { unsigned flags:12, pfn:20; };
|
|
struct { unsigned long val; } raw;
|
|
} gpte_t;
|
|
|
|
/* We have two convenient macros to convert a "raw" value as handed to us by
|
|
* the Guest into the correct Guest PGD or PTE type. */
|
|
#define mkgpte(_val) ((gpte_t){.raw.val = _val})
|
|
#define mkgpgd(_val) ((gpgd_t){.raw.val = _val})
|
|
/*:*/
|
|
|
|
struct pgdir
|
|
{
|
|
unsigned long cr3;
|
|
spgd_t *pgdir;
|
|
};
|
|
|
|
/* This is a guest-specific page (mapped ro) into the guest. */
|
|
struct lguest_ro_state
|
|
{
|
|
/* Host information we need to restore when we switch back. */
|
|
u32 host_cr3;
|
|
struct Xgt_desc_struct host_idt_desc;
|
|
struct Xgt_desc_struct host_gdt_desc;
|
|
u32 host_sp;
|
|
|
|
/* Fields which are used when guest is running. */
|
|
struct Xgt_desc_struct guest_idt_desc;
|
|
struct Xgt_desc_struct guest_gdt_desc;
|
|
struct i386_hw_tss guest_tss;
|
|
struct desc_struct guest_idt[IDT_ENTRIES];
|
|
struct desc_struct guest_gdt[GDT_ENTRIES];
|
|
};
|
|
|
|
/* 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 */
|
|
u16 guestid;
|
|
u32 pfn_limit;
|
|
u32 page_offset;
|
|
u32 cr2;
|
|
int halted;
|
|
int ts;
|
|
u32 next_hcall;
|
|
u32 esp1;
|
|
u8 ss1;
|
|
|
|
/* 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];
|
|
|
|
/* Cached wakeup: we hold a reference to this task. */
|
|
struct task_struct *wake;
|
|
|
|
unsigned long noirq_start, noirq_end;
|
|
int dma_is_pending;
|
|
unsigned long pending_dma; /* struct lguest_dma */
|
|
unsigned long pending_key; /* address they're sending to */
|
|
|
|
unsigned int stack_pages;
|
|
u32 tsc_khz;
|
|
|
|
struct lguest_dma_info dma[LGUEST_MAX_DMA];
|
|
|
|
/* Dead? */
|
|
const char *dead;
|
|
|
|
/* The GDT entries copied into lguest_ro_state when running. */
|
|
struct desc_struct gdt[GDT_ENTRIES];
|
|
|
|
/* The IDT entries: some copied into lguest_ro_state when running. */
|
|
struct desc_struct idt[FIRST_EXTERNAL_VECTOR+LGUEST_IRQS];
|
|
struct desc_struct syscall_idt;
|
|
|
|
/* Virtual clock device */
|
|
struct hrtimer hrt;
|
|
|
|
/* Pending virtual interrupts */
|
|
DECLARE_BITMAP(irqs_pending, LGUEST_IRQS);
|
|
};
|
|
|
|
extern struct lguest lguests[];
|
|
extern struct mutex lguest_lock;
|
|
|
|
/* core.c: */
|
|
u32 lgread_u32(struct lguest *lg, unsigned long addr);
|
|
void lgwrite_u32(struct lguest *lg, unsigned long addr, u32 val);
|
|
void lgread(struct lguest *lg, void *buf, unsigned long addr, unsigned len);
|
|
void lgwrite(struct lguest *lg, unsigned long, const void *buf, unsigned len);
|
|
int find_free_guest(void);
|
|
int lguest_address_ok(const struct lguest *lg,
|
|
unsigned long addr, unsigned long len);
|
|
int run_guest(struct lguest *lg, unsigned long __user *user);
|
|
|
|
|
|
/* 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);
|
|
|
|
/* 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 cr3, 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 cr3,
|
|
unsigned long vaddr, gpte_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);
|
|
|
|
/* lguest_user.c: */
|
|
int lguest_device_init(void);
|
|
void lguest_device_remove(void);
|
|
|
|
/* io.c: */
|
|
void lguest_io_init(void);
|
|
int bind_dma(struct lguest *lg,
|
|
unsigned long key, unsigned long udma, u16 numdmas, u8 interrupt);
|
|
void send_dma(struct lguest *info, unsigned long key, unsigned long udma);
|
|
void release_all_dma(struct lguest *lg);
|
|
unsigned long get_dma_buffer(struct lguest *lg, unsigned long key,
|
|
unsigned long *interrupt);
|
|
|
|
/* hypercalls.c: */
|
|
void do_hypercalls(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 does 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) :*/
|
|
|
|
static inline unsigned long guest_pa(struct lguest *lg, unsigned long vaddr)
|
|
{
|
|
return vaddr - lg->page_offset;
|
|
}
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _LGUEST_H */
|