| #ifndef _ASM_X86_PVCLOCK_ABI_H_ |
| #define _ASM_X86_PVCLOCK_ABI_H_ |
| * These structs MUST NOT be changed. |
| * They are the ABI between hypervisor and guest OS. |
| * Both Xen and KVM are using this. |
| * pvclock_vcpu_time_info holds the system time and the tsc timestamp |
| * of the last update. So the guest can use the tsc delta to get a |
| * more precise system time. There is one per virtual cpu. |
| * pvclock_wall_clock references the point in time when the system |
| * time was zero (usually boot time), thus the guest calculates the |
| * current wall clock by adding the system time. |
| * Protocol for the "version" fields is: hypervisor raises it (making |
| * it uneven) before it starts updating the fields and raises it again |
| * (making it even) when it is done. Thus the guest can make sure the |
| * time values it got are consistent by checking the version before |
| * and after reading them. |
| struct pvclock_vcpu_time_info { |
| } __attribute__((__packed__)); /* 32 bytes */ |
| struct pvclock_wall_clock { |
| } __attribute__((__packed__)); |
| #endif /* __ASSEMBLY__ */ |
| #endif /* _ASM_X86_PVCLOCK_ABI_H_ */ |