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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_PVCLOCK_ABI_H |
3 | #define _ASM_X86_PVCLOCK_ABI_H | |
7af192c9 GH |
4 | #ifndef __ASSEMBLY__ |
5 | ||
6 | /* | |
7 | * These structs MUST NOT be changed. | |
8 | * They are the ABI between hypervisor and guest OS. | |
9 | * Both Xen and KVM are using this. | |
10 | * | |
11 | * pvclock_vcpu_time_info holds the system time and the tsc timestamp | |
12 | * of the last update. So the guest can use the tsc delta to get a | |
13 | * more precise system time. There is one per virtual cpu. | |
14 | * | |
15 | * pvclock_wall_clock references the point in time when the system | |
16 | * time was zero (usually boot time), thus the guest calculates the | |
17 | * current wall clock by adding the system time. | |
18 | * | |
19 | * Protocol for the "version" fields is: hypervisor raises it (making | |
20 | * it uneven) before it starts updating the fields and raises it again | |
21 | * (making it even) when it is done. Thus the guest can make sure the | |
22 | * time values it got are consistent by checking the version before | |
23 | * and after reading them. | |
24 | */ | |
25 | ||
26 | struct pvclock_vcpu_time_info { | |
27 | u32 version; | |
28 | u32 pad0; | |
29 | u64 tsc_timestamp; | |
30 | u64 system_time; | |
31 | u32 tsc_to_system_mul; | |
32 | s8 tsc_shift; | |
424c32f1 GC |
33 | u8 flags; |
34 | u8 pad[2]; | |
7af192c9 GH |
35 | } __attribute__((__packed__)); /* 32 bytes */ |
36 | ||
37 | struct pvclock_wall_clock { | |
38 | u32 version; | |
39 | u32 sec; | |
40 | u32 nsec; | |
41 | } __attribute__((__packed__)); | |
42 | ||
3a0d7256 | 43 | #define PVCLOCK_TSC_STABLE_BIT (1 << 0) |
eae3ee7d | 44 | #define PVCLOCK_GUEST_STOPPED (1 << 1) |
9bac175d | 45 | /* PVCLOCK_COUNTS_FROM_ZERO broke ABI and can't be used anymore. */ |
61191725 | 46 | #define PVCLOCK_COUNTS_FROM_ZERO (1 << 2) |
7af192c9 | 47 | #endif /* __ASSEMBLY__ */ |
1965aae3 | 48 | #endif /* _ASM_X86_PVCLOCK_ABI_H */ |