1 /* Things the lguest guest needs to know. Note: like all lguest interfaces,
2 * this is subject to wild and random change between versions. */
3 #ifndef _LINUX_LGUEST_H
4 #define _LINUX_LGUEST_H
8 #include <asm/lguest_hcall.h>
10 #define LG_CLOCK_MIN_DELTA 100UL
11 #define LG_CLOCK_MAX_DELTA ULONG_MAX
13 /*G:032 The second method of communicating with the Host is to via "struct
14 * lguest_data". The Guest's very first hypercall is to tell the Host where
15 * this is, and then the Guest and Host both publish information in it. :*/
18 /* 512 == enabled (same as eflags in normal hardware). The Guest
19 * changes interrupts so often that a hypercall is too slow. */
20 unsigned int irq_enabled;
21 /* Fine-grained interrupt disabling by the Guest */
22 DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
24 /* The Host writes the virtual address of the last page fault here,
25 * which saves the Guest a hypercall. CR2 is the native register where
26 * this address would normally be found. */
29 /* Wallclock time set by the Host. */
32 /* Async hypercall ring. Instead of directly making hypercalls, we can
33 * place them in here for processing the next time the Host wants.
34 * This batching can be quite efficient. */
36 /* 0xFF == done (set by Host), 0 == pending (set by Guest). */
37 u8 hcall_status[LHCALL_RING_SIZE];
38 /* The actual registers for the hypercalls. */
39 struct hcall_args hcalls[LHCALL_RING_SIZE];
41 /* Fields initialized by the Host at boot: */
42 /* Memory not to try to access */
43 unsigned long reserve_mem;
44 /* KHz for the TSC clock. */
47 /* Fields initialized by the Guest at boot: */
48 /* Instruction range to suppress interrupts even if enabled */
49 unsigned long noirq_start, noirq_end;
51 extern struct lguest_data lguest_data;
52 #endif /* __ASSEMBLY__ */
53 #endif /* _LINUX_LGUEST_H */