xref: /linux/arch/powerpc/kvm/e500mc.c (revision ca64d84e93762f4e587e040a44ad9f6089afc777) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
4  *
5  * Author: Varun Sethi, <varun.sethi@freescale.com>
6  *
7  * Description:
8  * This file is derived from arch/powerpc/kvm/e500.c,
9  * by Yu Liu <yu.liu@freescale.com>.
10  */
11 
12 #include <linux/kvm_host.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/export.h>
16 #include <linux/miscdevice.h>
17 #include <linux/module.h>
18 
19 #include <asm/reg.h>
20 #include <asm/cputable.h>
21 #include <asm/kvm_ppc.h>
22 #include <asm/dbell.h>
23 
24 #include "booke.h"
25 #include "e500.h"
26 
27 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
28 {
29 	enum ppc_dbell dbell_type;
30 	unsigned long tag;
31 
32 	switch (type) {
33 	case INT_CLASS_NONCRIT:
34 		dbell_type = PPC_G_DBELL;
35 		break;
36 	case INT_CLASS_CRIT:
37 		dbell_type = PPC_G_DBELL_CRIT;
38 		break;
39 	case INT_CLASS_MC:
40 		dbell_type = PPC_G_DBELL_MC;
41 		break;
42 	default:
43 		WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
44 		return;
45 	}
46 
47 	preempt_disable();
48 	tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
49 	mb();
50 	ppc_msgsnd(dbell_type, 0, tag);
51 	preempt_enable();
52 }
53 
54 /* gtlbe must not be mapped by more than one host tlb entry */
55 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
56 			   struct kvm_book3e_206_tlb_entry *gtlbe)
57 {
58 	unsigned int tid, ts;
59 	gva_t eaddr;
60 	u32 val;
61 	unsigned long flags;
62 
63 	ts = get_tlb_ts(gtlbe);
64 	tid = get_tlb_tid(gtlbe);
65 
66 	/* We search the host TLB to invalidate its shadow TLB entry */
67 	val = (tid << 16) | ts;
68 	eaddr = get_tlb_eaddr(gtlbe);
69 
70 	local_irq_save(flags);
71 
72 	mtspr(SPRN_MAS6, val);
73 	mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
74 
75 	asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
76 	val = mfspr(SPRN_MAS1);
77 	if (val & MAS1_VALID) {
78 		mtspr(SPRN_MAS1, val & ~MAS1_VALID);
79 		asm volatile("tlbwe");
80 	}
81 	mtspr(SPRN_MAS5, 0);
82 	/* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
83 	mtspr(SPRN_MAS8, 0);
84 	isync();
85 
86 	local_irq_restore(flags);
87 }
88 
89 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
90 {
91 	unsigned long flags;
92 
93 	local_irq_save(flags);
94 	mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
95 	asm volatile("tlbilxlpid");
96 	mtspr(SPRN_MAS5, 0);
97 	local_irq_restore(flags);
98 }
99 
100 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
101 {
102 	vcpu->arch.pid = pid;
103 }
104 
105 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
106 {
107 }
108 
109 /* We use two lpids per VM */
110 static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
111 
112 static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
113 {
114 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
115 
116 	kvmppc_booke_vcpu_load(vcpu, cpu);
117 
118 	mtspr(SPRN_LPID, get_lpid(vcpu));
119 	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
120 	mtspr(SPRN_GPIR, vcpu->vcpu_id);
121 	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
122 	vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
123 	vcpu->arch.epsc = vcpu->arch.eplc;
124 	mtspr(SPRN_EPLC, vcpu->arch.eplc);
125 	mtspr(SPRN_EPSC, vcpu->arch.epsc);
126 
127 	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
128 	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
129 	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
130 	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
131 	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
132 	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
133 	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
134 
135 	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
136 	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
137 
138 	mtspr(SPRN_GEPR, vcpu->arch.epr);
139 	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
140 	mtspr(SPRN_GESR, vcpu->arch.shared->esr);
141 
142 	if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
143 	    __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
144 		kvmppc_e500_tlbil_all(vcpu_e500);
145 		__this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
146 	}
147 }
148 
149 static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
150 {
151 	vcpu->arch.eplc = mfspr(SPRN_EPLC);
152 	vcpu->arch.epsc = mfspr(SPRN_EPSC);
153 
154 	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
155 	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
156 	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
157 	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
158 
159 	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
160 	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
161 
162 	vcpu->arch.epr = mfspr(SPRN_GEPR);
163 	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
164 	vcpu->arch.shared->esr = mfspr(SPRN_GESR);
165 
166 	vcpu->arch.oldpir = mfspr(SPRN_PIR);
167 
168 	kvmppc_booke_vcpu_put(vcpu);
169 }
170 
171 int kvmppc_core_check_processor_compat(void)
172 {
173 	int r;
174 
175 	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
176 		r = 0;
177 	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
178 		r = 0;
179 #ifdef CONFIG_ALTIVEC
180 	/*
181 	 * Since guests have the privilege to enable AltiVec, we need AltiVec
182 	 * support in the host to save/restore their context.
183 	 * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
184 	 * because it's cleared in the absence of CONFIG_ALTIVEC!
185 	 */
186 	else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
187 		r = 0;
188 #endif
189 	else
190 		r = -ENOTSUPP;
191 
192 	return r;
193 }
194 
195 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
196 {
197 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
198 
199 	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
200 				 SPRN_EPCR_DUVD;
201 #ifdef CONFIG_64BIT
202 	vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
203 #endif
204 	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;
205 
206 	vcpu->arch.pvr = mfspr(SPRN_PVR);
207 	vcpu_e500->svr = mfspr(SPRN_SVR);
208 
209 	vcpu->arch.cpu_type = KVM_CPU_E500MC;
210 
211 	return 0;
212 }
213 
214 static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
215 					struct kvm_sregs *sregs)
216 {
217 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
218 
219 	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
220 			       KVM_SREGS_E_PC;
221 	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
222 
223 	sregs->u.e.impl.fsl.features = 0;
224 	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
225 	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
226 	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
227 
228 	kvmppc_get_sregs_e500_tlb(vcpu, sregs);
229 
230 	sregs->u.e.ivor_high[3] =
231 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
232 	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
233 	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
234 
235 	return kvmppc_get_sregs_ivor(vcpu, sregs);
236 }
237 
238 static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
239 					struct kvm_sregs *sregs)
240 {
241 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
242 	int ret;
243 
244 	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
245 		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
246 		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
247 		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
248 	}
249 
250 	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
251 	if (ret < 0)
252 		return ret;
253 
254 	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
255 		return 0;
256 
257 	if (sregs->u.e.features & KVM_SREGS_E_PM) {
258 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
259 			sregs->u.e.ivor_high[3];
260 	}
261 
262 	if (sregs->u.e.features & KVM_SREGS_E_PC) {
263 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
264 			sregs->u.e.ivor_high[4];
265 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
266 			sregs->u.e.ivor_high[5];
267 	}
268 
269 	return kvmppc_set_sregs_ivor(vcpu, sregs);
270 }
271 
272 static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
273 			      union kvmppc_one_reg *val)
274 {
275 	int r = 0;
276 
277 	switch (id) {
278 	case KVM_REG_PPC_SPRG9:
279 		*val = get_reg_val(id, vcpu->arch.sprg9);
280 		break;
281 	default:
282 		r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
283 	}
284 
285 	return r;
286 }
287 
288 static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
289 			      union kvmppc_one_reg *val)
290 {
291 	int r = 0;
292 
293 	switch (id) {
294 	case KVM_REG_PPC_SPRG9:
295 		vcpu->arch.sprg9 = set_reg_val(id, *val);
296 		break;
297 	default:
298 		r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
299 	}
300 
301 	return r;
302 }
303 
304 static int kvmppc_core_vcpu_create_e500mc(struct kvm_vcpu *vcpu)
305 {
306 	struct kvmppc_vcpu_e500 *vcpu_e500;
307 	int err;
308 
309 	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
310 	vcpu_e500 = to_e500(vcpu);
311 
312 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
313 	vcpu->arch.oldpir = 0xffffffff;
314 
315 	err = kvmppc_e500_tlb_init(vcpu_e500);
316 	if (err)
317 		return err;
318 
319 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
320 	if (!vcpu->arch.shared) {
321 		err = -ENOMEM;
322 		goto uninit_tlb;
323 	}
324 
325 	return 0;
326 
327 uninit_tlb:
328 	kvmppc_e500_tlb_uninit(vcpu_e500);
329 	return err;
330 }
331 
332 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
333 {
334 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
335 
336 	free_page((unsigned long)vcpu->arch.shared);
337 	kvmppc_e500_tlb_uninit(vcpu_e500);
338 }
339 
340 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
341 {
342 	int lpid;
343 
344 	lpid = kvmppc_alloc_lpid();
345 	if (lpid < 0)
346 		return lpid;
347 
348 	/*
349 	 * Use two lpids per VM on cores with two threads like e6500. Use
350 	 * even numbers to speedup vcpu lpid computation with consecutive lpids
351 	 * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
352 	 */
353 	if (threads_per_core == 2)
354 		lpid <<= 1;
355 
356 	kvm->arch.lpid = lpid;
357 	return 0;
358 }
359 
360 static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
361 {
362 	int lpid = kvm->arch.lpid;
363 
364 	if (threads_per_core == 2)
365 		lpid >>= 1;
366 
367 	kvmppc_free_lpid(lpid);
368 }
369 
370 static struct kvmppc_ops kvm_ops_e500mc = {
371 	.get_sregs = kvmppc_core_get_sregs_e500mc,
372 	.set_sregs = kvmppc_core_set_sregs_e500mc,
373 	.get_one_reg = kvmppc_get_one_reg_e500mc,
374 	.set_one_reg = kvmppc_set_one_reg_e500mc,
375 	.vcpu_load   = kvmppc_core_vcpu_load_e500mc,
376 	.vcpu_put    = kvmppc_core_vcpu_put_e500mc,
377 	.vcpu_create = kvmppc_core_vcpu_create_e500mc,
378 	.vcpu_free   = kvmppc_core_vcpu_free_e500mc,
379 	.init_vm = kvmppc_core_init_vm_e500mc,
380 	.destroy_vm = kvmppc_core_destroy_vm_e500mc,
381 	.emulate_op = kvmppc_core_emulate_op_e500,
382 	.emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
383 	.emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
384 };
385 
386 static int __init kvmppc_e500mc_init(void)
387 {
388 	int r;
389 
390 	r = kvmppc_booke_init();
391 	if (r)
392 		goto err_out;
393 
394 	/*
395 	 * Use two lpids per VM on dual threaded processors like e6500
396 	 * to workarround the lack of tlb write conditional instruction.
397 	 * Expose half the number of available hardware lpids to the lpid
398 	 * allocator.
399 	 */
400 	kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
401 	kvmppc_claim_lpid(0); /* host */
402 
403 	r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
404 	if (r)
405 		goto err_out;
406 	kvm_ops_e500mc.owner = THIS_MODULE;
407 	kvmppc_pr_ops = &kvm_ops_e500mc;
408 
409 err_out:
410 	return r;
411 }
412 
413 static void __exit kvmppc_e500mc_exit(void)
414 {
415 	kvmppc_pr_ops = NULL;
416 	kvmppc_booke_exit();
417 }
418 
419 module_init(kvmppc_e500mc_init);
420 module_exit(kvmppc_e500mc_exit);
421 MODULE_ALIAS_MISCDEV(KVM_MINOR);
422 MODULE_ALIAS("devname:kvm");
423