xref: /openbmc/linux/arch/s390/include/asm/uv.h (revision 2bdd5238)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Ultravisor Interfaces
4  *
5  * Copyright IBM Corp. 2019
6  *
7  * Author(s):
8  *	Vasily Gorbik <gor@linux.ibm.com>
9  *	Janosch Frank <frankja@linux.ibm.com>
10  */
11 #ifndef _ASM_S390_UV_H
12 #define _ASM_S390_UV_H
13 
14 #include <linux/types.h>
15 #include <linux/errno.h>
16 #include <linux/bug.h>
17 #include <linux/sched.h>
18 #include <asm/page.h>
19 #include <asm/gmap.h>
20 
21 #define UVC_RC_EXECUTED		0x0001
22 #define UVC_RC_INV_CMD		0x0002
23 #define UVC_RC_INV_STATE	0x0003
24 #define UVC_RC_INV_LEN		0x0005
25 #define UVC_RC_NO_RESUME	0x0007
26 #define UVC_RC_NEED_DESTROY	0x8000
27 
28 #define UVC_CMD_QUI			0x0001
29 #define UVC_CMD_INIT_UV			0x000f
30 #define UVC_CMD_CREATE_SEC_CONF		0x0100
31 #define UVC_CMD_DESTROY_SEC_CONF	0x0101
32 #define UVC_CMD_CREATE_SEC_CPU		0x0120
33 #define UVC_CMD_DESTROY_SEC_CPU		0x0121
34 #define UVC_CMD_CONV_TO_SEC_STOR	0x0200
35 #define UVC_CMD_CONV_FROM_SEC_STOR	0x0201
36 #define UVC_CMD_DESTR_SEC_STOR		0x0202
37 #define UVC_CMD_SET_SEC_CONF_PARAMS	0x0300
38 #define UVC_CMD_UNPACK_IMG		0x0301
39 #define UVC_CMD_VERIFY_IMG		0x0302
40 #define UVC_CMD_CPU_RESET		0x0310
41 #define UVC_CMD_CPU_RESET_INITIAL	0x0311
42 #define UVC_CMD_PREPARE_RESET		0x0320
43 #define UVC_CMD_CPU_RESET_CLEAR		0x0321
44 #define UVC_CMD_CPU_SET_STATE		0x0330
45 #define UVC_CMD_SET_UNSHARE_ALL		0x0340
46 #define UVC_CMD_PIN_PAGE_SHARED		0x0341
47 #define UVC_CMD_UNPIN_PAGE_SHARED	0x0342
48 #define UVC_CMD_SET_SHARED_ACCESS	0x1000
49 #define UVC_CMD_REMOVE_SHARED_ACCESS	0x1001
50 
51 /* Bits in installed uv calls */
52 enum uv_cmds_inst {
53 	BIT_UVC_CMD_QUI = 0,
54 	BIT_UVC_CMD_INIT_UV = 1,
55 	BIT_UVC_CMD_CREATE_SEC_CONF = 2,
56 	BIT_UVC_CMD_DESTROY_SEC_CONF = 3,
57 	BIT_UVC_CMD_CREATE_SEC_CPU = 4,
58 	BIT_UVC_CMD_DESTROY_SEC_CPU = 5,
59 	BIT_UVC_CMD_CONV_TO_SEC_STOR = 6,
60 	BIT_UVC_CMD_CONV_FROM_SEC_STOR = 7,
61 	BIT_UVC_CMD_SET_SHARED_ACCESS = 8,
62 	BIT_UVC_CMD_REMOVE_SHARED_ACCESS = 9,
63 	BIT_UVC_CMD_SET_SEC_PARMS = 11,
64 	BIT_UVC_CMD_UNPACK_IMG = 13,
65 	BIT_UVC_CMD_VERIFY_IMG = 14,
66 	BIT_UVC_CMD_CPU_RESET = 15,
67 	BIT_UVC_CMD_CPU_RESET_INITIAL = 16,
68 	BIT_UVC_CMD_CPU_SET_STATE = 17,
69 	BIT_UVC_CMD_PREPARE_RESET = 18,
70 	BIT_UVC_CMD_CPU_PERFORM_CLEAR_RESET = 19,
71 	BIT_UVC_CMD_UNSHARE_ALL = 20,
72 	BIT_UVC_CMD_PIN_PAGE_SHARED = 21,
73 	BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
74 };
75 
76 enum uv_feat_ind {
77 	BIT_UV_FEAT_MISC = 0,
78 };
79 
80 struct uv_cb_header {
81 	u16 len;
82 	u16 cmd;	/* Command Code */
83 	u16 rc;		/* Response Code */
84 	u16 rrc;	/* Return Reason Code */
85 } __packed __aligned(8);
86 
87 /* Query Ultravisor Information */
88 struct uv_cb_qui {
89 	struct uv_cb_header header;
90 	u64 reserved08;
91 	u64 inst_calls_list[4];
92 	u64 reserved30[2];
93 	u64 uv_base_stor_len;
94 	u64 reserved48;
95 	u64 conf_base_phys_stor_len;
96 	u64 conf_base_virt_stor_len;
97 	u64 conf_virt_var_stor_len;
98 	u64 cpu_stor_len;
99 	u32 reserved70[3];
100 	u32 max_num_sec_conf;
101 	u64 max_guest_stor_addr;
102 	u8  reserved88[158 - 136];
103 	u16 max_guest_cpu_id;
104 	u64 uv_feature_indications;
105 	u8  reserveda0[200 - 168];
106 } __packed __aligned(8);
107 
108 /* Initialize Ultravisor */
109 struct uv_cb_init {
110 	struct uv_cb_header header;
111 	u64 reserved08[2];
112 	u64 stor_origin;
113 	u64 stor_len;
114 	u64 reserved28[4];
115 } __packed __aligned(8);
116 
117 /* Create Guest Configuration */
118 struct uv_cb_cgc {
119 	struct uv_cb_header header;
120 	u64 reserved08[2];
121 	u64 guest_handle;
122 	u64 conf_base_stor_origin;
123 	u64 conf_virt_stor_origin;
124 	u64 reserved30;
125 	u64 guest_stor_origin;
126 	u64 guest_stor_len;
127 	u64 guest_sca;
128 	u64 guest_asce;
129 	u64 reserved58[5];
130 } __packed __aligned(8);
131 
132 /* Create Secure CPU */
133 struct uv_cb_csc {
134 	struct uv_cb_header header;
135 	u64 reserved08[2];
136 	u64 cpu_handle;
137 	u64 guest_handle;
138 	u64 stor_origin;
139 	u8  reserved30[6];
140 	u16 num;
141 	u64 state_origin;
142 	u64 reserved40[4];
143 } __packed __aligned(8);
144 
145 /* Convert to Secure */
146 struct uv_cb_cts {
147 	struct uv_cb_header header;
148 	u64 reserved08[2];
149 	u64 guest_handle;
150 	u64 gaddr;
151 } __packed __aligned(8);
152 
153 /* Convert from Secure / Pin Page Shared */
154 struct uv_cb_cfs {
155 	struct uv_cb_header header;
156 	u64 reserved08[2];
157 	u64 paddr;
158 } __packed __aligned(8);
159 
160 /* Set Secure Config Parameter */
161 struct uv_cb_ssc {
162 	struct uv_cb_header header;
163 	u64 reserved08[2];
164 	u64 guest_handle;
165 	u64 sec_header_origin;
166 	u32 sec_header_len;
167 	u32 reserved2c;
168 	u64 reserved30[4];
169 } __packed __aligned(8);
170 
171 /* Unpack */
172 struct uv_cb_unp {
173 	struct uv_cb_header header;
174 	u64 reserved08[2];
175 	u64 guest_handle;
176 	u64 gaddr;
177 	u64 tweak[2];
178 	u64 reserved38[3];
179 } __packed __aligned(8);
180 
181 #define PV_CPU_STATE_OPR	1
182 #define PV_CPU_STATE_STP	2
183 #define PV_CPU_STATE_CHKSTP	3
184 #define PV_CPU_STATE_OPR_LOAD	5
185 
186 struct uv_cb_cpu_set_state {
187 	struct uv_cb_header header;
188 	u64 reserved08[2];
189 	u64 cpu_handle;
190 	u8  reserved20[7];
191 	u8  state;
192 	u64 reserved28[5];
193 };
194 
195 /*
196  * A common UV call struct for calls that take no payload
197  * Examples:
198  * Destroy cpu/config
199  * Verify
200  */
201 struct uv_cb_nodata {
202 	struct uv_cb_header header;
203 	u64 reserved08[2];
204 	u64 handle;
205 	u64 reserved20[4];
206 } __packed __aligned(8);
207 
208 /* Set Shared Access */
209 struct uv_cb_share {
210 	struct uv_cb_header header;
211 	u64 reserved08[3];
212 	u64 paddr;
213 	u64 reserved28;
214 } __packed __aligned(8);
215 
216 static inline int __uv_call(unsigned long r1, unsigned long r2)
217 {
218 	int cc;
219 
220 	asm volatile(
221 		"	.insn rrf,0xB9A40000,%[r1],%[r2],0,0\n"
222 		"	ipm	%[cc]\n"
223 		"	srl	%[cc],28\n"
224 		: [cc] "=d" (cc)
225 		: [r1] "a" (r1), [r2] "a" (r2)
226 		: "memory", "cc");
227 	return cc;
228 }
229 
230 static inline int uv_call(unsigned long r1, unsigned long r2)
231 {
232 	int cc;
233 
234 	do {
235 		cc = __uv_call(r1, r2);
236 	} while (cc > 1);
237 	return cc;
238 }
239 
240 /* Low level uv_call that avoids stalls for long running busy conditions  */
241 static inline int uv_call_sched(unsigned long r1, unsigned long r2)
242 {
243 	int cc;
244 
245 	do {
246 		cc = __uv_call(r1, r2);
247 		cond_resched();
248 	} while (cc > 1);
249 	return cc;
250 }
251 
252 /*
253  * special variant of uv_call that only transports the cpu or guest
254  * handle and the command, like destroy or verify.
255  */
256 static inline int uv_cmd_nodata(u64 handle, u16 cmd, u16 *rc, u16 *rrc)
257 {
258 	struct uv_cb_nodata uvcb = {
259 		.header.cmd = cmd,
260 		.header.len = sizeof(uvcb),
261 		.handle = handle,
262 	};
263 	int cc;
264 
265 	WARN(!handle, "No handle provided to Ultravisor call cmd %x\n", cmd);
266 	cc = uv_call_sched(0, (u64)&uvcb);
267 	*rc = uvcb.header.rc;
268 	*rrc = uvcb.header.rrc;
269 	return cc ? -EINVAL : 0;
270 }
271 
272 struct uv_info {
273 	unsigned long inst_calls_list[4];
274 	unsigned long uv_base_stor_len;
275 	unsigned long guest_base_stor_len;
276 	unsigned long guest_virt_base_stor_len;
277 	unsigned long guest_virt_var_stor_len;
278 	unsigned long guest_cpu_stor_len;
279 	unsigned long max_sec_stor_addr;
280 	unsigned int max_num_sec_conf;
281 	unsigned short max_guest_cpu_id;
282 	unsigned long uv_feature_indications;
283 };
284 
285 extern struct uv_info uv_info;
286 
287 #ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
288 extern int prot_virt_guest;
289 
290 static inline int is_prot_virt_guest(void)
291 {
292 	return prot_virt_guest;
293 }
294 
295 static inline int share(unsigned long addr, u16 cmd)
296 {
297 	struct uv_cb_share uvcb = {
298 		.header.cmd = cmd,
299 		.header.len = sizeof(uvcb),
300 		.paddr = addr
301 	};
302 
303 	if (!is_prot_virt_guest())
304 		return -EOPNOTSUPP;
305 	/*
306 	 * Sharing is page wise, if we encounter addresses that are
307 	 * not page aligned, we assume something went wrong. If
308 	 * malloced structs are passed to this function, we could leak
309 	 * data to the hypervisor.
310 	 */
311 	BUG_ON(addr & ~PAGE_MASK);
312 
313 	if (!uv_call(0, (u64)&uvcb))
314 		return 0;
315 	return -EINVAL;
316 }
317 
318 /*
319  * Guest 2 request to the Ultravisor to make a page shared with the
320  * hypervisor for IO.
321  *
322  * @addr: Real or absolute address of the page to be shared
323  */
324 static inline int uv_set_shared(unsigned long addr)
325 {
326 	return share(addr, UVC_CMD_SET_SHARED_ACCESS);
327 }
328 
329 /*
330  * Guest 2 request to the Ultravisor to make a page unshared.
331  *
332  * @addr: Real or absolute address of the page to be unshared
333  */
334 static inline int uv_remove_shared(unsigned long addr)
335 {
336 	return share(addr, UVC_CMD_REMOVE_SHARED_ACCESS);
337 }
338 
339 #else
340 #define is_prot_virt_guest() 0
341 static inline int uv_set_shared(unsigned long addr) { return 0; }
342 static inline int uv_remove_shared(unsigned long addr) { return 0; }
343 #endif
344 
345 #if IS_ENABLED(CONFIG_KVM)
346 extern int prot_virt_host;
347 
348 static inline int is_prot_virt_host(void)
349 {
350 	return prot_virt_host;
351 }
352 
353 int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb);
354 int uv_destroy_page(unsigned long paddr);
355 int uv_convert_from_secure(unsigned long paddr);
356 int gmap_convert_to_secure(struct gmap *gmap, unsigned long gaddr);
357 
358 void setup_uv(void);
359 #else
360 #define is_prot_virt_host() 0
361 static inline void setup_uv(void) {}
362 
363 static inline int uv_destroy_page(unsigned long paddr)
364 {
365 	return 0;
366 }
367 
368 static inline int uv_convert_from_secure(unsigned long paddr)
369 {
370 	return 0;
371 }
372 #endif
373 
374 #endif /* _ASM_S390_UV_H */
375