/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_PVCLOCK_ABI_H #define _ASM_X86_PVCLOCK_ABI_H #ifndef __ASSEMBLER__ /* * 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 { u32 version; u32 pad0; u64 tsc_timestamp; u64 system_time; u32 tsc_to_system_mul; s8 tsc_shift; u8 flags; u8 pad[2]; } __attribute__((__packed__)); /* 32 bytes */ struct pvclock_wall_clock { u32 version; u32 sec; u32 nsec; } __attribute__((__packed__)); #define PVCLOCK_TSC_STABLE_BIT (1 << 0) #define PVCLOCK_GUEST_STOPPED (1 << 1) /* PVCLOCK_COUNTS_FROM_ZERO broke ABI and can't be used anymore. */ #define PVCLOCK_COUNTS_FROM_ZERO (1 << 2) #endif /* __ASSEMBLER__ */ #endif /* _ASM_X86_PVCLOCK_ABI_H */