summaryrefslogtreecommitdiffstats
path: root/arch/s390/kvm/sthyi.c
blob: 926b5244263efd3dd1fadf637ce4790251367e60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
/*
 * store hypervisor information instruction emulation functions.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 * Copyright IBM Corp. 2016
 * Author(s): Janosch Frank <frankja@linux.vnet.ibm.com>
 */
#include <linux/kvm_host.h>
#include <linux/errno.h>
#include <linux/pagemap.h>
#include <linux/vmalloc.h>
#include <linux/ratelimit.h>

#include <asm/kvm_host.h>
#include <asm/asm-offsets.h>
#include <asm/sclp.h>
#include <asm/diag.h>
#include <asm/sysinfo.h>
#include <asm/ebcdic.h>

#include "kvm-s390.h"
#include "gaccess.h"
#include "trace.h"

#define DED_WEIGHT 0xffff
/*
 * CP and IFL as EBCDIC strings, SP/0x40 determines the end of string
 * as they are justified with spaces.
 */
#define CP  0xc3d7404040404040UL
#define IFL 0xc9c6d34040404040UL

enum hdr_flags {
	HDR_NOT_LPAR   = 0x10,
	HDR_STACK_INCM = 0x20,
	HDR_STSI_UNAV  = 0x40,
	HDR_PERF_UNAV  = 0x80,
};

enum mac_validity {
	MAC_NAME_VLD = 0x20,
	MAC_ID_VLD   = 0x40,
	MAC_CNT_VLD  = 0x80,
};

enum par_flag {
	PAR_MT_EN = 0x80,
};

enum par_validity {
	PAR_GRP_VLD  = 0x08,
	PAR_ID_VLD   = 0x10,
	PAR_ABS_VLD  = 0x20,
	PAR_WGHT_VLD = 0x40,
	PAR_PCNT_VLD  = 0x80,
};

struct hdr_sctn {
	u8 infhflg1;
	u8 infhflg2; /* reserved */
	u8 infhval1; /* reserved */
	u8 infhval2; /* reserved */
	u8 reserved[3];
	u8 infhygct;
	u16 infhtotl;
	u16 infhdln;
	u16 infmoff;
	u16 infmlen;
	u16 infpoff;
	u16 infplen;
	u16 infhoff1;
	u16 infhlen1;
	u16 infgoff1;
	u16 infglen1;
	u16 infhoff2;
	u16 infhlen2;
	u16 infgoff2;
	u16 infglen2;
	u16 infhoff3;
	u16 infhlen3;
	u16 infgoff3;
	u16 infglen3;
	u8 reserved2[4];
} __packed;

struct mac_sctn {
	u8 infmflg1; /* reserved */
	u8 infmflg2; /* reserved */
	u8 infmval1;
	u8 infmval2; /* reserved */
	u16 infmscps;
	u16 infmdcps;
	u16 infmsifl;
	u16 infmdifl;
	char infmname[8];
	char infmtype[4];
	char infmmanu[16];
	char infmseq[16];
	char infmpman[4];
	u8 reserved[4];
} __packed;

struct par_sctn {
	u8 infpflg1;
	u8 infpflg2; /* reserved */
	u8 infpval1;
	u8 infpval2; /* reserved */
	u16 infppnum;
	u16 infpscps;
	u16 infpdcps;
	u16 infpsifl;
	u16 infpdifl;
	u16 reserved;
	char infppnam[8];
	u32 infpwbcp;
	u32 infpabcp;
	u32 infpwbif;
	u32 infpabif;
	char infplgnm[8];
	u32 infplgcp;
	u32 infplgif;
} __packed;

struct sthyi_sctns {
	struct hdr_sctn hdr;
	struct mac_sctn mac;
	struct par_sctn par;
} __packed;

struct cpu_inf {
	u64 lpar_cap;
	u64 lpar_grp_cap;
	u64 lpar_weight;
	u64 all_weight;
	int cpu_num_ded;
	int cpu_num_shd;
};

struct lpar_cpu_inf {
	struct cpu_inf cp;
	struct cpu_inf ifl;
};

static inline u64 cpu_id(u8 ctidx, void *diag224_buf)
{
	return *((u64 *)(diag224_buf + (ctidx + 1) * DIAG204_CPU_NAME_LEN));
}

/*
 * Scales the cpu capping from the lpar range to the one expected in
 * sthyi data.
 *
 * diag204 reports a cap in hundredths of processor units.
 * z/VM's range for one core is 0 - 0x10000.
 */
static u32 scale_cap(u32 in)
{
	return (0x10000 * in) / 100;
}

static void fill_hdr(struct sthyi_sctns *sctns)
{
	sctns->hdr.infhdln = sizeof(sctns->hdr);
	sctns->hdr.infmoff = sizeof(sctns->hdr);
	sctns->hdr.infmlen = sizeof(sctns->mac);
	sctns->hdr.infplen = sizeof(sctns->par);
	sctns->hdr.infpoff = sctns->hdr.infhdln + sctns->hdr.infmlen;
	sctns->hdr.infhtotl = sctns->hdr.infpoff + sctns->hdr.infplen;
}

static void fill_stsi_mac(struct sthyi_sctns *sctns,
			  struct sysinfo_1_1_1 *sysinfo)
{
	if (stsi(sysinfo, 1, 1, 1))
		return;

	sclp_ocf_cpc_name_copy(sctns->mac.infmname);

	memcpy(sctns->mac.infmtype, sysinfo->type, sizeof(sctns->mac.infmtype));
	memcpy(sctns->mac.infmmanu, sysinfo->manufacturer, sizeof(sctns->mac.infmmanu));
	memcpy(sctns->mac.infmpman, sysinfo->plant, sizeof(sctns->mac.infmpman));
	memcpy(sctns->mac.infmseq, sysinfo->sequence, sizeof(sctns->mac.infmseq));

	sctns->mac.infmval1 |= MAC_ID_VLD | MAC_NAME_VLD;
}

static void fill_stsi_par(struct sthyi_sctns *sctns,
			  struct sysinfo_2_2_2 *sysinfo)
{
	if (stsi(sysinfo, 2, 2, 2))
		return;

	sctns->par.infppnum = sysinfo->lpar_number;
	memcpy(sctns->par.infppnam, sysinfo->name, sizeof(sctns->par.infppnam));

	sctns->par.infpval1 |= PAR_ID_VLD;
}

static void fill_stsi(struct sthyi_sctns *sctns)
{
	void *sysinfo;

	/* Errors are handled through the validity bits in the response. */
	sysinfo = (void *)__get_free_page(GFP_KERNEL);
	if (!sysinfo)
		return;

	fill_stsi_mac(sctns, sysinfo);
	fill_stsi_par(sctns, sysinfo);

	free_pages((unsigned long)sysinfo, 0);
}

static void fill_diag_mac(struct sthyi_sctns *sctns,
			  struct diag204_x_phys_block *block,
			  void *diag224_buf)
{
	int i;

	for (i = 0; i < block->hdr.cpus; i++) {
		switch (cpu_id(block->cpus[i].ctidx, diag224_buf)) {
		case CP:
			if (block->cpus[i].weight == DED_WEIGHT)
				sctns->mac.infmdcps++;
			else
				sctns->mac.infmscps++;
			break;
		case IFL:
			if (block->cpus[i].weight == DED_WEIGHT)
				sctns->mac.infmdifl++;
			else
				sctns->mac.infmsifl++;
			break;
		}
	}
	sctns->mac.infmval1 |= MAC_CNT_VLD;
}

/* Returns a pointer to the the next partition block. */
static struct diag204_x_part_block *lpar_cpu_inf(struct lpar_cpu_inf *part_inf,
						 bool this_lpar,
						 void *diag224_buf,
						 struct diag204_x_part_block *block)
{
	int i, capped = 0, weight_cp = 0, weight_ifl = 0;
	struct cpu_inf *cpu_inf;

	for (i = 0; i < block->hdr.rcpus; i++) {
		if (!(block->cpus[i].cflag & DIAG204_CPU_ONLINE))
			continue;

		switch (cpu_id(block->cpus[i].ctidx, diag224_buf)) {
		case CP:
			cpu_inf = &part_inf->cp;
			if (block->cpus[i].cur_weight < DED_WEIGHT)
				weight_cp |= block->cpus[i].cur_weight;
			break;
		case IFL:
			cpu_inf = &part_inf->ifl;
			if (block->cpus[i].cur_weight < DED_WEIGHT)
				weight_ifl |= block->cpus[i].cur_weight;
			break;
		default:
			continue;
		}

		if (!this_lpar)
			continue;

		capped |= block->cpus[i].cflag & DIAG204_CPU_CAPPED;
		cpu_inf->lpar_cap |= block->cpus[i].cpu_type_cap;
		cpu_inf->lpar_grp_cap |= block->cpus[i].group_cpu_type_cap;

		if (block->cpus[i].weight == DED_WEIGHT)
			cpu_inf->cpu_num_ded += 1;
		else
			cpu_inf->cpu_num_shd += 1;
	}

	if (this_lpar && capped) {
		part_inf->cp.lpar_weight = weight_cp;
		part_inf->ifl.lpar_weight = weight_ifl;
	}
	part_inf->cp.all_weight += weight_cp;
	part_inf->ifl.all_weight += weight_ifl;
	return (struct diag204_x_part_block *)&block->cpus[i];
}

static void fill_diag(struct sthyi_sctns *sctns)
{
	int i, r, pages;
	bool this_lpar;
	void *diag204_buf;
	void *diag224_buf = NULL;
	struct diag204_x_info_blk_hdr *ti_hdr;
	struct diag204_x_part_block *part_block;
	struct diag204_x_phys_block *phys_block;
	struct lpar_cpu_inf lpar_inf = {};

	/* Errors are handled through the validity bits in the response. */
	pages = diag204((unsigned long)DIAG204_SUBC_RSI |
			(unsigned long)DIAG204_INFO_EXT, 0, NULL);
	if (pages <= 0)
		return;

	diag204_buf = vmalloc(PAGE_SIZE * pages);
	if (!diag204_buf)
		return;

	r = diag204((unsigned long)DIAG204_SUBC_STIB7 |
		    (unsigned long)DIAG204_INFO_EXT, pages, diag204_buf);
	if (r < 0)
		goto out;

	diag224_buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
	if (!diag224_buf || diag224(diag224_buf))
		goto out;

	ti_hdr = diag204_buf;
	part_block = diag204_buf + sizeof(*ti_hdr);

	for (i = 0; i < ti_hdr->npar; i++) {
		/*
		 * For the calling lpar we also need to get the cpu
		 * caps and weights. The time information block header
		 * specifies the offset to the partition block of the
		 * caller lpar, so we know when we process its data.
		 */
		this_lpar = (void *)part_block - diag204_buf == ti_hdr->this_part;
		part_block = lpar_cpu_inf(&lpar_inf, this_lpar, diag224_buf,
					  part_block);
	}

	phys_block = (struct diag204_x_phys_block *)part_block;
	part_block = diag204_buf + ti_hdr->this_part;
	if (part_block->hdr.mtid)
		sctns->par.infpflg1 = PAR_MT_EN;

	sctns->par.infpval1 |= PAR_GRP_VLD;
	sctns->par.infplgcp = scale_cap(lpar_inf.cp.lpar_grp_cap);
	sctns->par.infplgif = scale_cap(lpar_inf.ifl.lpar_grp_cap);
	memcpy(sctns->par.infplgnm, part_block->hdr.hardware_group_name,
	       sizeof(sctns->par.infplgnm));

	sctns->par.infpscps = lpar_inf.cp.cpu_num_shd;
	sctns->par.infpdcps = lpar_inf.cp.cpu_num_ded;
	sctns->par.infpsifl = lpar_inf.ifl.cpu_num_shd;
	sctns->par.infpdifl = lpar_inf.ifl.cpu_num_ded;
	sctns->par.infpval1 |= PAR_PCNT_VLD;

	sctns->par.infpabcp = scale_cap(lpar_inf.cp.lpar_cap);
	sctns->par.infpabif = scale_cap(lpar_inf.ifl.lpar_cap);
	sctns->par.infpval1 |= PAR_ABS_VLD;

	/*
	 * Everything below needs global performance data to be
	 * meaningful.
	 */
	if (!(ti_hdr->flags & DIAG204_LPAR_PHYS_FLG)) {
		sctns->hdr.infhflg1 |= HDR_PERF_UNAV;
		goto out;
	}

	fill_diag_mac(sctns, phys_block, diag224_buf);

	if (lpar_inf.cp.lpar_weight) {
		sctns->par.infpwbcp = sctns->mac.infmscps * 0x10000 *
			lpar_inf.cp.lpar_weight / lpar_inf.cp.all_weight;
	}

	if (lpar_inf.ifl.lpar_weight) {
		sctns->par.infpwbif = sctns->mac.infmsifl * 0x10000 *
			lpar_inf.ifl.lpar_weight / lpar_inf.ifl.all_weight;
	}
	sctns->par.infpval1 |= PAR_WGHT_VLD;

out:
	free_page((unsigned long)diag224_buf);
	vfree(diag204_buf);
}

static int sthyi(u64 vaddr)
{
	register u64 code asm("0") = 0;
	register u64 addr asm("2") = vaddr;
	int cc;

	asm volatile(
		".insn   rre,0xB2560000,%[code],%[addr]\n"
		"ipm     %[cc]\n"
		"srl     %[cc],28\n"
		: [cc] "=d" (cc)
		: [code] "d" (code), [addr] "a" (addr)
		: "memory", "cc");
	return cc;
}

int handle_sthyi(struct kvm_vcpu *vcpu)
{
	int reg1, reg2, r = 0;
	u64 code, addr, cc = 0;
	struct sthyi_sctns *sctns = NULL;

	if (!test_kvm_facility(vcpu->kvm, 74))
		return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);

	/*
	 * STHYI requires extensive locking in the higher hypervisors
	 * and is very computational/memory expensive. Therefore we
	 * ratelimit the executions per VM.
	 */
	if (!__ratelimit(&vcpu->kvm->arch.sthyi_limit)) {
		kvm_s390_retry_instr(vcpu);
		return 0;
	}

	kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
	code = vcpu->run->s.regs.gprs[reg1];
	addr = vcpu->run->s.regs.gprs[reg2];

	vcpu->stat.instruction_sthyi++;
	VCPU_EVENT(vcpu, 3, "STHYI: fc: %llu addr: 0x%016llx", code, addr);
	trace_kvm_s390_handle_sthyi(vcpu, code, addr);

	if (reg1 == reg2 || reg1 & 1 || reg2 & 1 || addr & ~PAGE_MASK)
		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	if (code & 0xffff) {
		cc = 3;
		goto out;
	}

	/*
	 * If the page has not yet been faulted in, we want to do that
	 * now and not after all the expensive calculations.
	 */
	r = write_guest(vcpu, addr, reg2, &cc, 1);
	if (r)
		return kvm_s390_inject_prog_cond(vcpu, r);

	sctns = (void *)get_zeroed_page(GFP_KERNEL);
	if (!sctns)
		return -ENOMEM;

	/*
	 * If we are a guest, we don't want to emulate an emulated
	 * instruction. We ask the hypervisor to provide the data.
	 */
	if (test_facility(74)) {
		cc = sthyi((u64)sctns);
		goto out;
	}

	fill_hdr(sctns);
	fill_stsi(sctns);
	fill_diag(sctns);

out:
	if (!cc) {
		r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
		if (r) {
			free_page((unsigned long)sctns);
			return kvm_s390_inject_prog_cond(vcpu, r);
		}
	}

	free_page((unsigned long)sctns);
	vcpu->run->s.regs.gprs[reg2 + 1] = cc ? 4 : 0;
	kvm_s390_set_psw_cc(vcpu, cc);
	return r;
}
OpenPOWER on IntegriCloud