H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 1 | #ifndef _ASM_X86_PVCLOCK_ABI_H |
| 2 | #define _ASM_X86_PVCLOCK_ABI_H |
Gerd Hoffmann | 7af192c | 2008-06-03 16:17:29 +0200 | [diff] [blame] | 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; |
Glauber Costa | 424c32f | 2010-05-11 12:17:39 -0400 | [diff] [blame] | 32 | u8 flags; |
| 33 | u8 pad[2]; |
Gerd Hoffmann | 7af192c | 2008-06-03 16:17:29 +0200 | [diff] [blame] | 34 | } __attribute__((__packed__)); /* 32 bytes */ |
| 35 | |
| 36 | struct pvclock_wall_clock { |
| 37 | u32 version; |
| 38 | u32 sec; |
| 39 | u32 nsec; |
| 40 | } __attribute__((__packed__)); |
| 41 | |
Glauber Costa | 3a0d725 | 2010-05-11 12:17:45 -0400 | [diff] [blame] | 42 | #define PVCLOCK_TSC_STABLE_BIT (1 << 0) |
Eric B Munson | eae3ee7 | 2012-03-10 14:37:25 -0500 | [diff] [blame] | 43 | #define PVCLOCK_GUEST_STOPPED (1 << 1) |
Marcelo Tosatti | 6119172 | 2015-05-28 20:20:39 -0300 | [diff] [blame] | 44 | #define PVCLOCK_COUNTS_FROM_ZERO (1 << 2) |
Gerd Hoffmann | 7af192c | 2008-06-03 16:17:29 +0200 | [diff] [blame] | 45 | #endif /* __ASSEMBLY__ */ |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 46 | #endif /* _ASM_X86_PVCLOCK_ABI_H */ |