/* * 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.
*/
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