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  1. #ifndef _ASM_X86_PVCLOCK_ABI_H
  2. #define _ASM_X86_PVCLOCK_ABI_H
  3. #ifndef __ASSEMBLY__
  4.  
  5. /*
  6.  * These structs MUST NOT be changed.
  7.  * They are the ABI between hypervisor and guest OS.
  8.  * Both Xen and KVM are using this.
  9.  *
  10.  * pvclock_vcpu_time_info holds the system time and the tsc timestamp
  11.  * of the last update. So the guest can use the tsc delta to get a
  12.  * more precise system time.  There is one per virtual cpu.
  13.  *
  14.  * pvclock_wall_clock references the point in time when the system
  15.  * time was zero (usually boot time), thus the guest calculates the
  16.  * current wall clock by adding the system time.
  17.  *
  18.  * Protocol for the "version" fields is: hypervisor raises it (making
  19.  * it uneven) before it starts updating the fields and raises it again
  20.  * (making it even) when it is done.  Thus the guest can make sure the
  21.  * time values it got are consistent by checking the version before
  22.  * and after reading them.
  23.  */
  24.  
  25. struct pvclock_vcpu_time_info {
  26.         u32   version;
  27.         u32   pad0;
  28.         u64   tsc_timestamp;
  29.         u64   system_time;
  30.         u32   tsc_to_system_mul;
  31.         s8    tsc_shift;
  32.         u8    flags;
  33.         u8    pad[2];
  34. } __attribute__((__packed__)); /* 32 bytes */
  35.  
  36. struct pvclock_wall_clock {
  37.         u32   version;
  38.         u32   sec;
  39.         u32   nsec;
  40. } __attribute__((__packed__));
  41.  
  42. #define PVCLOCK_TSC_STABLE_BIT  (1 << 0)
  43. #define PVCLOCK_GUEST_STOPPED   (1 << 1)
  44. /* PVCLOCK_COUNTS_FROM_ZERO broke ABI and can't be used anymore. */
  45. #define PVCLOCK_COUNTS_FROM_ZERO (1 << 2)
  46. #endif /* __ASSEMBLY__ */
  47. #endif /* _ASM_X86_PVCLOCK_ABI_H */
  48.