2 * Things the lguest guest needs to know. Note: like all lguest interfaces,
3 * this is subject to wild and random change between versions.
5 #ifndef _LINUX_LGUEST_H
6 #define _LINUX_LGUEST_H
9 #include <linux/time.h>
11 #include <asm/lguest_hcall.h>
13 #define LG_CLOCK_MIN_DELTA 100UL
14 #define LG_CLOCK_MAX_DELTA ULONG_MAX
17 * The second method of communicating with the Host is to via "struct
18 * lguest_data". Once the Guest's initialization hypercall tells the Host where
19 * this is, the Guest and Host both publish information in it.
23 * 512 == enabled (same as eflags in normal hardware). The Guest
24 * changes interrupts so often that a hypercall is too slow.
26 unsigned int irq_enabled
;
27 /* Fine-grained interrupt disabling by the Guest */
28 DECLARE_BITMAP(blocked_interrupts
, LGUEST_IRQS
);
31 * The Host writes the virtual address of the last page fault here,
32 * which saves the Guest a hypercall. CR2 is the native register where
33 * this address would normally be found.
37 /* Wallclock time set by the Host. */
41 * Interrupt pending set by the Host. The Guest should do a hypercall
42 * if it re-enables interrupts and sees this set (to X86_EFLAGS_IF).
47 * Async hypercall ring. Instead of directly making hypercalls, we can
48 * place them in here for processing the next time the Host wants.
49 * This batching can be quite efficient.
52 /* 0xFF == done (set by Host), 0 == pending (set by Guest). */
53 u8 hcall_status
[LHCALL_RING_SIZE
];
54 /* The actual registers for the hypercalls. */
55 struct hcall_args hcalls
[LHCALL_RING_SIZE
];
57 /* Fields initialized by the Host at boot: */
58 /* Memory not to try to access */
59 unsigned long reserve_mem
;
60 /* KHz for the TSC clock. */
63 /* Fields initialized by the Guest at boot: */
64 /* Instruction range to suppress interrupts even if enabled */
65 unsigned long noirq_start
, noirq_end
;
66 /* Address above which page tables are all identical. */
67 unsigned long kernel_address
;
68 /* The vector to try to use for system calls (0x40 or 0x80). */
69 unsigned int syscall_vec
;
71 extern struct lguest_data lguest_data
;
72 #endif /* __ASSEMBLY__ */
73 #endif /* _LINUX_LGUEST_H */
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