xref: /openbmc/linux/arch/powerpc/kvm/e500mc.c (revision b34e08d5) 
1 /*
2  * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
3  *
4  * Author: Varun Sethi, <varun.sethi@freescale.com>
5  *
6  * Description:
7  * This file is derived from arch/powerpc/kvm/e500.c,
8  * by Yu Liu <yu.liu@freescale.com>.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License, version 2, as
12  * published by the Free Software Foundation.
13  */
14 
15 #include <linux/kvm_host.h>
16 #include <linux/slab.h>
17 #include <linux/err.h>
18 #include <linux/export.h>
19 #include <linux/miscdevice.h>
20 #include <linux/module.h>
21 
22 #include <asm/reg.h>
23 #include <asm/cputable.h>
24 #include <asm/tlbflush.h>
25 #include <asm/kvm_ppc.h>
26 #include <asm/dbell.h>
27 
28 #include "booke.h"
29 #include "e500.h"
30 
31 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
32 {
33 	enum ppc_dbell dbell_type;
34 	unsigned long tag;
35 
36 	switch (type) {
37 	case INT_CLASS_NONCRIT:
38 		dbell_type = PPC_G_DBELL;
39 		break;
40 	case INT_CLASS_CRIT:
41 		dbell_type = PPC_G_DBELL_CRIT;
42 		break;
43 	case INT_CLASS_MC:
44 		dbell_type = PPC_G_DBELL_MC;
45 		break;
46 	default:
47 		WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
48 		return;
49 	}
50 
51 
52 	tag = PPC_DBELL_LPID(vcpu->kvm->arch.lpid) | vcpu->vcpu_id;
53 	mb();
54 	ppc_msgsnd(dbell_type, 0, tag);
55 }
56 
57 /* gtlbe must not be mapped by more than one host tlb entry */
58 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
59 			   struct kvm_book3e_206_tlb_entry *gtlbe)
60 {
61 	unsigned int tid, ts;
62 	gva_t eaddr;
63 	u32 val, lpid;
64 	unsigned long flags;
65 
66 	ts = get_tlb_ts(gtlbe);
67 	tid = get_tlb_tid(gtlbe);
68 	lpid = vcpu_e500->vcpu.kvm->arch.lpid;
69 
70 	/* We search the host TLB to invalidate its shadow TLB entry */
71 	val = (tid << 16) | ts;
72 	eaddr = get_tlb_eaddr(gtlbe);
73 
74 	local_irq_save(flags);
75 
76 	mtspr(SPRN_MAS6, val);
77 	mtspr(SPRN_MAS5, MAS5_SGS | lpid);
78 
79 	asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
80 	val = mfspr(SPRN_MAS1);
81 	if (val & MAS1_VALID) {
82 		mtspr(SPRN_MAS1, val & ~MAS1_VALID);
83 		asm volatile("tlbwe");
84 	}
85 	mtspr(SPRN_MAS5, 0);
86 	/* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
87 	mtspr(SPRN_MAS8, 0);
88 	isync();
89 
90 	local_irq_restore(flags);
91 }
92 
93 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
94 {
95 	unsigned long flags;
96 
97 	local_irq_save(flags);
98 	mtspr(SPRN_MAS5, MAS5_SGS | vcpu_e500->vcpu.kvm->arch.lpid);
99 	asm volatile("tlbilxlpid");
100 	mtspr(SPRN_MAS5, 0);
101 	local_irq_restore(flags);
102 }
103 
104 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
105 {
106 	vcpu->arch.pid = pid;
107 }
108 
109 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
110 {
111 }
112 
113 static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu_on_cpu);
114 
115 static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
116 {
117 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
118 
119 	kvmppc_booke_vcpu_load(vcpu, cpu);
120 
121 	mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
122 	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
123 	mtspr(SPRN_GPIR, vcpu->vcpu_id);
124 	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
125 	mtspr(SPRN_EPLC, vcpu->arch.eplc);
126 	mtspr(SPRN_EPSC, vcpu->arch.epsc);
127 
128 	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
129 	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
130 	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
131 	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
132 	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
133 	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
134 	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
135 
136 	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
137 	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
138 
139 	mtspr(SPRN_GEPR, vcpu->arch.epr);
140 	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
141 	mtspr(SPRN_GESR, vcpu->arch.shared->esr);
142 
143 	if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
144 	    __get_cpu_var(last_vcpu_on_cpu) != vcpu) {
145 		kvmppc_e500_tlbil_all(vcpu_e500);
146 		__get_cpu_var(last_vcpu_on_cpu) = vcpu;
147 	}
148 
149 	kvmppc_load_guest_fp(vcpu);
150 }
151 
152 static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
153 {
154 	vcpu->arch.eplc = mfspr(SPRN_EPLC);
155 	vcpu->arch.epsc = mfspr(SPRN_EPSC);
156 
157 	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
158 	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
159 	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
160 	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
161 
162 	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
163 	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
164 
165 	vcpu->arch.epr = mfspr(SPRN_GEPR);
166 	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
167 	vcpu->arch.shared->esr = mfspr(SPRN_GESR);
168 
169 	vcpu->arch.oldpir = mfspr(SPRN_PIR);
170 
171 	kvmppc_booke_vcpu_put(vcpu);
172 }
173 
174 int kvmppc_core_check_processor_compat(void)
175 {
176 	int r;
177 
178 	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
179 		r = 0;
180 	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
181 		r = 0;
182 	else
183 		r = -ENOTSUPP;
184 
185 	return r;
186 }
187 
188 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
189 {
190 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
191 
192 	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
193 				 SPRN_EPCR_DUVD;
194 #ifdef CONFIG_64BIT
195 	vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
196 #endif
197 	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
198 	vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
199 	vcpu->arch.epsc = vcpu->arch.eplc;
200 
201 	vcpu->arch.pvr = mfspr(SPRN_PVR);
202 	vcpu_e500->svr = mfspr(SPRN_SVR);
203 
204 	vcpu->arch.cpu_type = KVM_CPU_E500MC;
205 
206 	return 0;
207 }
208 
209 static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
210 					struct kvm_sregs *sregs)
211 {
212 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
213 
214 	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
215 			       KVM_SREGS_E_PC;
216 	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
217 
218 	sregs->u.e.impl.fsl.features = 0;
219 	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
220 	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
221 	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
222 
223 	kvmppc_get_sregs_e500_tlb(vcpu, sregs);
224 
225 	sregs->u.e.ivor_high[3] =
226 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
227 	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
228 	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
229 
230 	return kvmppc_get_sregs_ivor(vcpu, sregs);
231 }
232 
233 static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
234 					struct kvm_sregs *sregs)
235 {
236 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
237 	int ret;
238 
239 	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
240 		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
241 		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
242 		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
243 	}
244 
245 	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
246 	if (ret < 0)
247 		return ret;
248 
249 	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
250 		return 0;
251 
252 	if (sregs->u.e.features & KVM_SREGS_E_PM) {
253 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
254 			sregs->u.e.ivor_high[3];
255 	}
256 
257 	if (sregs->u.e.features & KVM_SREGS_E_PC) {
258 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
259 			sregs->u.e.ivor_high[4];
260 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
261 			sregs->u.e.ivor_high[5];
262 	}
263 
264 	return kvmppc_set_sregs_ivor(vcpu, sregs);
265 }
266 
267 static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
268 			      union kvmppc_one_reg *val)
269 {
270 	int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
271 	return r;
272 }
273 
274 static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
275 			      union kvmppc_one_reg *val)
276 {
277 	int r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
278 	return r;
279 }
280 
281 static struct kvm_vcpu *kvmppc_core_vcpu_create_e500mc(struct kvm *kvm,
282 						       unsigned int id)
283 {
284 	struct kvmppc_vcpu_e500 *vcpu_e500;
285 	struct kvm_vcpu *vcpu;
286 	int err;
287 
288 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
289 	if (!vcpu_e500) {
290 		err = -ENOMEM;
291 		goto out;
292 	}
293 	vcpu = &vcpu_e500->vcpu;
294 
295 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
296 	vcpu->arch.oldpir = 0xffffffff;
297 
298 	err = kvm_vcpu_init(vcpu, kvm, id);
299 	if (err)
300 		goto free_vcpu;
301 
302 	err = kvmppc_e500_tlb_init(vcpu_e500);
303 	if (err)
304 		goto uninit_vcpu;
305 
306 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
307 	if (!vcpu->arch.shared)
308 		goto uninit_tlb;
309 
310 	return vcpu;
311 
312 uninit_tlb:
313 	kvmppc_e500_tlb_uninit(vcpu_e500);
314 uninit_vcpu:
315 	kvm_vcpu_uninit(vcpu);
316 
317 free_vcpu:
318 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
319 out:
320 	return ERR_PTR(err);
321 }
322 
323 static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
324 {
325 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
326 
327 	free_page((unsigned long)vcpu->arch.shared);
328 	kvmppc_e500_tlb_uninit(vcpu_e500);
329 	kvm_vcpu_uninit(vcpu);
330 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
331 }
332 
333 static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
334 {
335 	int lpid;
336 
337 	lpid = kvmppc_alloc_lpid();
338 	if (lpid < 0)
339 		return lpid;
340 
341 	kvm->arch.lpid = lpid;
342 	return 0;
343 }
344 
345 static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
346 {
347 	kvmppc_free_lpid(kvm->arch.lpid);
348 }
349 
350 static struct kvmppc_ops kvm_ops_e500mc = {
351 	.get_sregs = kvmppc_core_get_sregs_e500mc,
352 	.set_sregs = kvmppc_core_set_sregs_e500mc,
353 	.get_one_reg = kvmppc_get_one_reg_e500mc,
354 	.set_one_reg = kvmppc_set_one_reg_e500mc,
355 	.vcpu_load   = kvmppc_core_vcpu_load_e500mc,
356 	.vcpu_put    = kvmppc_core_vcpu_put_e500mc,
357 	.vcpu_create = kvmppc_core_vcpu_create_e500mc,
358 	.vcpu_free   = kvmppc_core_vcpu_free_e500mc,
359 	.mmu_destroy  = kvmppc_mmu_destroy_e500,
360 	.init_vm = kvmppc_core_init_vm_e500mc,
361 	.destroy_vm = kvmppc_core_destroy_vm_e500mc,
362 	.emulate_op = kvmppc_core_emulate_op_e500,
363 	.emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
364 	.emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
365 };
366 
367 static int __init kvmppc_e500mc_init(void)
368 {
369 	int r;
370 
371 	r = kvmppc_booke_init();
372 	if (r)
373 		goto err_out;
374 
375 	kvmppc_init_lpid(64);
376 	kvmppc_claim_lpid(0); /* host */
377 
378 	r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
379 	if (r)
380 		goto err_out;
381 	kvm_ops_e500mc.owner = THIS_MODULE;
382 	kvmppc_pr_ops = &kvm_ops_e500mc;
383 
384 err_out:
385 	return r;
386 }
387 
388 static void __exit kvmppc_e500mc_exit(void)
389 {
390 	kvmppc_pr_ops = NULL;
391 	kvmppc_booke_exit();
392 }
393 
394 module_init(kvmppc_e500mc_init);
395 module_exit(kvmppc_e500mc_exit);
396 MODULE_ALIAS_MISCDEV(KVM_MINOR);
397 MODULE_ALIAS("devname:kvm");
398