xref: /linux/arch/s390/include/uapi/asm/uvdevice.h (revision cdd5b5a9761fd66d17586e4f4ba6588c70e640ea)
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 
11 struct 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
22 struct 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  */
48 struct 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 
78 enum 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