1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 *  Copyright IBM Corp. 2022
4 *  Author(s): Steffen Eiden <seiden@linux.ibm.com>
5 */
6#ifndef __S390_ASM_UVDEVICE_H
7#define __S390_ASM_UVDEVICE_H
8
9#include <linux/types.h>
10
11struct uvio_ioctl_cb {
12	__u32 flags;
13	__u16 uv_rc;			/* UV header rc value */
14	__u16 uv_rrc;			/* UV header rrc value */
15	__u64 argument_addr;		/* Userspace address of uvio argument */
16	__u32 argument_len;
17	__u8  reserved14[0x40 - 0x14];	/* must be zero */
18};
19
20#define UVIO_ATT_USER_DATA_LEN		0x100
21#define UVIO_ATT_UID_LEN		0x10
22struct uvio_attest {
23	__u64 arcb_addr;				/* 0x0000 */
24	__u64 meas_addr;				/* 0x0008 */
25	__u64 add_data_addr;				/* 0x0010 */
26	__u8  user_data[UVIO_ATT_USER_DATA_LEN];	/* 0x0018 */
27	__u8  config_uid[UVIO_ATT_UID_LEN];		/* 0x0118 */
28	__u32 arcb_len;					/* 0x0128 */
29	__u32 meas_len;					/* 0x012c */
30	__u32 add_data_len;				/* 0x0130 */
31	__u16 user_data_len;				/* 0x0134 */
32	__u16 reserved136;				/* 0x0136 */
33};
34
35/**
36 * uvio_uvdev_info - Information of supported functions
37 * @supp_uvio_cmds - supported IOCTLs by this device
38 * @supp_uv_cmds - supported UVCs corresponding to the IOCTL
39 *
40 * UVIO request to get information about supported request types by this
41 * uvdevice and the Ultravisor.  Everything is output. Bits are in LSB0
42 * ordering.  If the bit is set in both, @supp_uvio_cmds and @supp_uv_cmds, the
43 * uvdevice and the Ultravisor support that call.
44 *
45 * Note that bit 0 (UVIO_IOCTL_UVDEV_INFO_NR) is always zero for `supp_uv_cmds`
46 * as there is no corresponding UV-call.
47 */
48struct uvio_uvdev_info {
49	/*
50	 * If bit `n` is set, this device supports the IOCTL with nr `n`.
51	 */
52	__u64 supp_uvio_cmds;
53	/*
54	 * If bit `n` is set, the Ultravisor(UV) supports the UV-call
55	 * corresponding to the IOCTL with nr `n` in the calling contextx (host
56	 * or guest).  The value is only valid if the corresponding bit in
57	 * @supp_uvio_cmds is set as well.
58	 */
59	__u64 supp_uv_cmds;
60};
61
62/*
63 * The following max values define an upper length for the IOCTL in/out buffers.
64 * However, they do not represent the maximum the Ultravisor allows which is
65 * often way smaller. By allowing larger buffer sizes we hopefully do not need
66 * to update the code with every machine update. It is therefore possible for
67 * userspace to request more memory than actually used by kernel/UV.
68 */
69#define UVIO_ATT_ARCB_MAX_LEN		0x100000
70#define UVIO_ATT_MEASUREMENT_MAX_LEN	0x8000
71#define UVIO_ATT_ADDITIONAL_MAX_LEN	0x8000
72#define UVIO_ADD_SECRET_MAX_LEN		0x100000
73#define UVIO_LIST_SECRETS_LEN		0x1000
74
75#define UVIO_DEVICE_NAME "uv"
76#define UVIO_TYPE_UVC 'u'
77
78enum UVIO_IOCTL_NR {
79	UVIO_IOCTL_UVDEV_INFO_NR = 0x00,
80	UVIO_IOCTL_ATT_NR,
81	UVIO_IOCTL_ADD_SECRET_NR,
82	UVIO_IOCTL_LIST_SECRETS_NR,
83	UVIO_IOCTL_LOCK_SECRETS_NR,
84	/* must be the last entry */
85	UVIO_IOCTL_NUM_IOCTLS
86};
87
88#define UVIO_IOCTL(nr)		_IOWR(UVIO_TYPE_UVC, nr, struct uvio_ioctl_cb)
89#define UVIO_IOCTL_UVDEV_INFO	UVIO_IOCTL(UVIO_IOCTL_UVDEV_INFO_NR)
90#define UVIO_IOCTL_ATT		UVIO_IOCTL(UVIO_IOCTL_ATT_NR)
91#define UVIO_IOCTL_ADD_SECRET	UVIO_IOCTL(UVIO_IOCTL_ADD_SECRET_NR)
92#define UVIO_IOCTL_LIST_SECRETS	UVIO_IOCTL(UVIO_IOCTL_LIST_SECRETS_NR)
93#define UVIO_IOCTL_LOCK_SECRETS	UVIO_IOCTL(UVIO_IOCTL_LOCK_SECRETS_NR)
94
95#define UVIO_SUPP_CALL(nr)	(1ULL << (nr))
96#define UVIO_SUPP_UDEV_INFO	UVIO_SUPP_CALL(UVIO_IOCTL_UDEV_INFO_NR)
97#define UVIO_SUPP_ATT		UVIO_SUPP_CALL(UVIO_IOCTL_ATT_NR)
98#define UVIO_SUPP_ADD_SECRET	UVIO_SUPP_CALL(UVIO_IOCTL_ADD_SECRET_NR)
99#define UVIO_SUPP_LIST_SECRETS	UVIO_SUPP_CALL(UVIO_IOCTL_LIST_SECRETS_NR)
100#define UVIO_SUPP_LOCK_SECRETS	UVIO_SUPP_CALL(UVIO_IOCTL_LOCK_SECRETS_NR)
101
102#endif /* __S390_ASM_UVDEVICE_H */
103