include/linux/lguest.h

   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
   5
   6 #ifndef __ASSEMBLY__
   7 #include <asm/irq.h>
   8 #include <asm/lguest_hcall.h>
   9
  10 #define LG_CLOCK_MIN_DELTA      100UL
  11 #define LG_CLOCK_MAX_DELTA      ULONG_MAX
  12
  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. :*/
  16 struct lguest_data
  17 {
  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);
  23
  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. */
  27         unsigned long cr2;
  28
  29         /* Wallclock time set by the Host. */
  30         struct timespec time;
  31
  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. */
  35
  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_ring hcalls[LHCALL_RING_SIZE];
  40
  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. */
  45         u32 tsc_khz;
  46
  47 /* Fields initialized by the Guest at boot: */
  48         /* Instruction range to suppress interrupts even if enabled */
  49         unsigned long noirq_start, noirq_end;
  50 };
  51 extern struct lguest_data lguest_data;
  52 #endif /* __ASSEMBLY__ */
  53 #endif  /* _LINUX_LGUEST_H */