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| 6588 | serge | 1 | #ifndef _ASM_X86_PVCLOCK_ABI_H |
| 2 | #define _ASM_X86_PVCLOCK_ABI_H |
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| 3 | #ifndef __ASSEMBLY__ |
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| 4 | |||
| 5 | /* |
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| 6 | * These structs MUST NOT be changed. |
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| 7 | * They are the ABI between hypervisor and guest OS. |
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| 8 | * Both Xen and KVM are using this. |
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| 9 | * |
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| 10 | * pvclock_vcpu_time_info holds the system time and the tsc timestamp |
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| 11 | * of the last update. So the guest can use the tsc delta to get a |
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| 12 | * more precise system time. There is one per virtual cpu. |
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| 13 | * |
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| 14 | * pvclock_wall_clock references the point in time when the system |
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| 15 | * time was zero (usually boot time), thus the guest calculates the |
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| 16 | * current wall clock by adding the system time. |
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| 17 | * |
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| 18 | * Protocol for the "version" fields is: hypervisor raises it (making |
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| 19 | * it uneven) before it starts updating the fields and raises it again |
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| 20 | * (making it even) when it is done. Thus the guest can make sure the |
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| 21 | * time values it got are consistent by checking the version before |
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| 22 | * and after reading them. |
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| 23 | */ |
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| 24 | |||
| 25 | struct pvclock_vcpu_time_info { |
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| 26 | u32 version; |
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| 27 | u32 pad0; |
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| 28 | u64 tsc_timestamp; |
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| 29 | u64 system_time; |
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| 30 | u32 tsc_to_system_mul; |
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| 31 | s8 tsc_shift; |
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| 32 | u8 flags; |
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| 33 | u8 pad[2]; |
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| 34 | } __attribute__((__packed__)); /* 32 bytes */ |
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| 35 | |||
| 36 | struct pvclock_wall_clock { |
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| 37 | u32 version; |
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| 38 | u32 sec; |
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| 39 | u32 nsec; |
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| 40 | } __attribute__((__packed__)); |
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| 41 | |||
| 42 | #define PVCLOCK_TSC_STABLE_BIT (1 << 0) |
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| 43 | #define PVCLOCK_GUEST_STOPPED (1 << 1) |
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| 44 | /* PVCLOCK_COUNTS_FROM_ZERO broke ABI and can't be used anymore. */ |
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| 45 | #define PVCLOCK_COUNTS_FROM_ZERO (1 << 2) |
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| 46 | #endif /* __ASSEMBLY__ */ |
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| 47 | #endif /* _ASM_X86_PVCLOCK_ABI_H */ |