[linux-block.git] / arch / x86 / include / asm / pvclock-abi.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_PVCLOCK_ABI_H
#define _ASM_X86_PVCLOCK_ABI_H
#ifndef __ASSEMBLY__

/*
 * 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 /* __ASSEMBLY__ */
#endif /* _ASM_X86_PVCLOCK_ABI_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1965aae3 PA	2	#ifndef _ASM_X86_PVCLOCK_ABI_H
1965aae3 PA	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;
424c32f1 GC	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 */