tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1#ifndef _ASM_X86_LGUEST_H
2#define _ASM_X86_LGUEST_H
3
4#define GDT_ENTRY_LGUEST_CS 10
5#define GDT_ENTRY_LGUEST_DS 11
6#define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
7#define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)
8
9#ifndef __ASSEMBLY__
10#include <asm/desc.h>
11
12#define GUEST_PL 1
13
14/* Page for Switcher text itself, then two pages per cpu */
15#define TOTAL_SWITCHER_PAGES (1 + 2 * nr_cpu_ids)
16
17/* Where we map the Switcher, in both Host and Guest. */
18extern unsigned long switcher_addr;
19
20/* Found in switcher.S */
21extern unsigned long default_idt_entries[];
22
23/* Declarations for definitions in lguest_guest.S */
24extern char lguest_noirq_start[], lguest_noirq_end[];
25extern const char lgstart_cli[], lgend_cli[];
26extern const char lgstart_sti[], lgend_sti[];
27extern const char lgstart_popf[], lgend_popf[];
28extern const char lgstart_pushf[], lgend_pushf[];
29extern const char lgstart_iret[], lgend_iret[];
30
31extern void lguest_iret(void);
32extern void lguest_init(void);
33
34struct lguest_regs {
35 /* Manually saved part. */
36 unsigned long eax, ebx, ecx, edx;
37 unsigned long esi, edi, ebp;
38 unsigned long gs;
39 unsigned long fs, ds, es;
40 unsigned long trapnum, errcode;
41 /* Trap pushed part */
42 unsigned long eip;
43 unsigned long cs;
44 unsigned long eflags;
45 unsigned long esp;
46 unsigned long ss;
47};
48
49/* This is a guest-specific page (mapped ro) into the guest. */
50struct lguest_ro_state {
51 /* Host information we need to restore when we switch back. */
52 u32 host_cr3;
53 struct desc_ptr host_idt_desc;
54 struct desc_ptr host_gdt_desc;
55 u32 host_sp;
56
57 /* Fields which are used when guest is running. */
58 struct desc_ptr guest_idt_desc;
59 struct desc_ptr guest_gdt_desc;
60 struct x86_hw_tss guest_tss;
61 struct desc_struct guest_idt[IDT_ENTRIES];
62 struct desc_struct guest_gdt[GDT_ENTRIES];
63};
64
65struct lg_cpu_arch {
66 /* The GDT entries copied into lguest_ro_state when running. */
67 struct desc_struct gdt[GDT_ENTRIES];
68
69 /* The IDT entries: some copied into lguest_ro_state when running. */
70 struct desc_struct idt[IDT_ENTRIES];
71
72 /* The address of the last guest-visible pagefault (ie. cr2). */
73 unsigned long last_pagefault;
74};
75
76static inline void lguest_set_ts(void)
77{
78 u32 cr0;
79
80 cr0 = read_cr0();
81 if (!(cr0 & 8))
82 write_cr0(cr0 | 8);
83}
84
85/* Full 4G segment descriptors, suitable for CS and DS. */
86#define FULL_EXEC_SEGMENT \
87 ((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
88#define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
89
90#endif /* __ASSEMBLY__ */
91
92#endif /* _ASM_X86_LGUEST_H */