xref: /openbmc/linux/arch/powerpc/kvm/e500mc.c (revision e23feb16)
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 
20 #include <asm/reg.h>
21 #include <asm/cputable.h>
22 #include <asm/tlbflush.h>
23 #include <asm/kvm_ppc.h>
24 #include <asm/dbell.h>
25 
26 #include "booke.h"
27 #include "e500.h"
28 
29 void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
30 {
31 	enum ppc_dbell dbell_type;
32 	unsigned long tag;
33 
34 	switch (type) {
35 	case INT_CLASS_NONCRIT:
36 		dbell_type = PPC_G_DBELL;
37 		break;
38 	case INT_CLASS_CRIT:
39 		dbell_type = PPC_G_DBELL_CRIT;
40 		break;
41 	case INT_CLASS_MC:
42 		dbell_type = PPC_G_DBELL_MC;
43 		break;
44 	default:
45 		WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
46 		return;
47 	}
48 
49 
50 	tag = PPC_DBELL_LPID(vcpu->kvm->arch.lpid) | vcpu->vcpu_id;
51 	mb();
52 	ppc_msgsnd(dbell_type, 0, tag);
53 }
54 
55 /* gtlbe must not be mapped by more than one host tlb entry */
56 void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
57 			   struct kvm_book3e_206_tlb_entry *gtlbe)
58 {
59 	unsigned int tid, ts;
60 	gva_t eaddr;
61 	u32 val, lpid;
62 	unsigned long flags;
63 
64 	ts = get_tlb_ts(gtlbe);
65 	tid = get_tlb_tid(gtlbe);
66 	lpid = vcpu_e500->vcpu.kvm->arch.lpid;
67 
68 	/* We search the host TLB to invalidate its shadow TLB entry */
69 	val = (tid << 16) | ts;
70 	eaddr = get_tlb_eaddr(gtlbe);
71 
72 	local_irq_save(flags);
73 
74 	mtspr(SPRN_MAS6, val);
75 	mtspr(SPRN_MAS5, MAS5_SGS | lpid);
76 
77 	asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
78 	val = mfspr(SPRN_MAS1);
79 	if (val & MAS1_VALID) {
80 		mtspr(SPRN_MAS1, val & ~MAS1_VALID);
81 		asm volatile("tlbwe");
82 	}
83 	mtspr(SPRN_MAS5, 0);
84 	/* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
85 	mtspr(SPRN_MAS8, 0);
86 	isync();
87 
88 	local_irq_restore(flags);
89 }
90 
91 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
92 {
93 	unsigned long flags;
94 
95 	local_irq_save(flags);
96 	mtspr(SPRN_MAS5, MAS5_SGS | vcpu_e500->vcpu.kvm->arch.lpid);
97 	asm volatile("tlbilxlpid");
98 	mtspr(SPRN_MAS5, 0);
99 	local_irq_restore(flags);
100 }
101 
102 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
103 {
104 	vcpu->arch.pid = pid;
105 }
106 
107 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
108 {
109 }
110 
111 static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu_on_cpu);
112 
113 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
114 {
115 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
116 
117 	kvmppc_booke_vcpu_load(vcpu, cpu);
118 
119 	mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
120 	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
121 	mtspr(SPRN_GPIR, vcpu->vcpu_id);
122 	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
123 	mtspr(SPRN_EPLC, vcpu->arch.eplc);
124 	mtspr(SPRN_EPSC, vcpu->arch.epsc);
125 
126 	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
127 	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
128 	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
129 	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
130 	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
131 	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
132 	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
133 
134 	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
135 	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
136 
137 	mtspr(SPRN_GEPR, vcpu->arch.epr);
138 	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
139 	mtspr(SPRN_GESR, vcpu->arch.shared->esr);
140 
141 	if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
142 	    __get_cpu_var(last_vcpu_on_cpu) != vcpu) {
143 		kvmppc_e500_tlbil_all(vcpu_e500);
144 		__get_cpu_var(last_vcpu_on_cpu) = vcpu;
145 	}
146 
147 	kvmppc_load_guest_fp(vcpu);
148 }
149 
150 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
151 {
152 	vcpu->arch.eplc = mfspr(SPRN_EPLC);
153 	vcpu->arch.epsc = mfspr(SPRN_EPSC);
154 
155 	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
156 	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
157 	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
158 	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
159 
160 	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
161 	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
162 
163 	vcpu->arch.epr = mfspr(SPRN_GEPR);
164 	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
165 	vcpu->arch.shared->esr = mfspr(SPRN_GESR);
166 
167 	vcpu->arch.oldpir = mfspr(SPRN_PIR);
168 
169 	kvmppc_booke_vcpu_put(vcpu);
170 }
171 
172 int kvmppc_core_check_processor_compat(void)
173 {
174 	int r;
175 
176 	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
177 		r = 0;
178 	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
179 		r = 0;
180 	else
181 		r = -ENOTSUPP;
182 
183 	return r;
184 }
185 
186 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
187 {
188 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
189 
190 	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
191 				 SPRN_EPCR_DUVD;
192 #ifdef CONFIG_64BIT
193 	vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
194 #endif
195 	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
196 	vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
197 	vcpu->arch.epsc = vcpu->arch.eplc;
198 
199 	vcpu->arch.pvr = mfspr(SPRN_PVR);
200 	vcpu_e500->svr = mfspr(SPRN_SVR);
201 
202 	vcpu->arch.cpu_type = KVM_CPU_E500MC;
203 
204 	return 0;
205 }
206 
207 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
208 {
209 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
210 
211 	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
212 			       KVM_SREGS_E_PC;
213 	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
214 
215 	sregs->u.e.impl.fsl.features = 0;
216 	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
217 	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
218 	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
219 
220 	kvmppc_get_sregs_e500_tlb(vcpu, sregs);
221 
222 	sregs->u.e.ivor_high[3] =
223 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
224 	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
225 	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
226 
227 	kvmppc_get_sregs_ivor(vcpu, sregs);
228 }
229 
230 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
231 {
232 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
233 	int ret;
234 
235 	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
236 		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
237 		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
238 		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
239 	}
240 
241 	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
242 	if (ret < 0)
243 		return ret;
244 
245 	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
246 		return 0;
247 
248 	if (sregs->u.e.features & KVM_SREGS_E_PM) {
249 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
250 			sregs->u.e.ivor_high[3];
251 	}
252 
253 	if (sregs->u.e.features & KVM_SREGS_E_PC) {
254 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
255 			sregs->u.e.ivor_high[4];
256 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
257 			sregs->u.e.ivor_high[5];
258 	}
259 
260 	return kvmppc_set_sregs_ivor(vcpu, sregs);
261 }
262 
263 int kvmppc_get_one_reg(struct kvm_vcpu *vcpu, u64 id,
264 			union kvmppc_one_reg *val)
265 {
266 	int r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
267 	return r;
268 }
269 
270 int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id,
271 		       union kvmppc_one_reg *val)
272 {
273 	int r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
274 	return r;
275 }
276 
277 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
278 {
279 	struct kvmppc_vcpu_e500 *vcpu_e500;
280 	struct kvm_vcpu *vcpu;
281 	int err;
282 
283 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
284 	if (!vcpu_e500) {
285 		err = -ENOMEM;
286 		goto out;
287 	}
288 	vcpu = &vcpu_e500->vcpu;
289 
290 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
291 	vcpu->arch.oldpir = 0xffffffff;
292 
293 	err = kvm_vcpu_init(vcpu, kvm, id);
294 	if (err)
295 		goto free_vcpu;
296 
297 	err = kvmppc_e500_tlb_init(vcpu_e500);
298 	if (err)
299 		goto uninit_vcpu;
300 
301 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
302 	if (!vcpu->arch.shared)
303 		goto uninit_tlb;
304 
305 	return vcpu;
306 
307 uninit_tlb:
308 	kvmppc_e500_tlb_uninit(vcpu_e500);
309 uninit_vcpu:
310 	kvm_vcpu_uninit(vcpu);
311 
312 free_vcpu:
313 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
314 out:
315 	return ERR_PTR(err);
316 }
317 
318 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
319 {
320 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
321 
322 	free_page((unsigned long)vcpu->arch.shared);
323 	kvmppc_e500_tlb_uninit(vcpu_e500);
324 	kvm_vcpu_uninit(vcpu);
325 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
326 }
327 
328 int kvmppc_core_init_vm(struct kvm *kvm)
329 {
330 	int lpid;
331 
332 	lpid = kvmppc_alloc_lpid();
333 	if (lpid < 0)
334 		return lpid;
335 
336 	kvm->arch.lpid = lpid;
337 	return 0;
338 }
339 
340 void kvmppc_core_destroy_vm(struct kvm *kvm)
341 {
342 	kvmppc_free_lpid(kvm->arch.lpid);
343 }
344 
345 static int __init kvmppc_e500mc_init(void)
346 {
347 	int r;
348 
349 	r = kvmppc_booke_init();
350 	if (r)
351 		return r;
352 
353 	kvmppc_init_lpid(64);
354 	kvmppc_claim_lpid(0); /* host */
355 
356 	return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
357 }
358 
359 static void __exit kvmppc_e500mc_exit(void)
360 {
361 	kvmppc_booke_exit();
362 }
363 
364 module_init(kvmppc_e500mc_init);
365 module_exit(kvmppc_e500mc_exit);
366