xref: /openbmc/linux/arch/powerpc/kvm/e500mc.c (revision d0b73b48) 
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 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
112 {
113 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
114 
115 	kvmppc_booke_vcpu_load(vcpu, cpu);
116 
117 	mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
118 	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
119 	mtspr(SPRN_GPIR, vcpu->vcpu_id);
120 	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
121 	mtspr(SPRN_EPLC, vcpu->arch.eplc);
122 	mtspr(SPRN_EPSC, vcpu->arch.epsc);
123 
124 	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
125 	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
126 	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
127 	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
128 	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
129 	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
130 	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
131 
132 	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
133 	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
134 
135 	mtspr(SPRN_GEPR, vcpu->arch.epr);
136 	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
137 	mtspr(SPRN_GESR, vcpu->arch.shared->esr);
138 
139 	if (vcpu->arch.oldpir != mfspr(SPRN_PIR))
140 		kvmppc_e500_tlbil_all(vcpu_e500);
141 
142 	kvmppc_load_guest_fp(vcpu);
143 }
144 
145 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
146 {
147 	vcpu->arch.eplc = mfspr(SPRN_EPLC);
148 	vcpu->arch.epsc = mfspr(SPRN_EPSC);
149 
150 	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
151 	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
152 	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
153 	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
154 
155 	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
156 	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
157 
158 	vcpu->arch.epr = mfspr(SPRN_GEPR);
159 	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
160 	vcpu->arch.shared->esr = mfspr(SPRN_GESR);
161 
162 	vcpu->arch.oldpir = mfspr(SPRN_PIR);
163 
164 	kvmppc_booke_vcpu_put(vcpu);
165 }
166 
167 int kvmppc_core_check_processor_compat(void)
168 {
169 	int r;
170 
171 	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
172 		r = 0;
173 	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
174 		r = 0;
175 	else
176 		r = -ENOTSUPP;
177 
178 	return r;
179 }
180 
181 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
182 {
183 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
184 
185 	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
186 				 SPRN_EPCR_DUVD;
187 #ifdef CONFIG_64BIT
188 	vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
189 #endif
190 	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
191 	vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
192 	vcpu->arch.epsc = vcpu->arch.eplc;
193 
194 	vcpu->arch.pvr = mfspr(SPRN_PVR);
195 	vcpu_e500->svr = mfspr(SPRN_SVR);
196 
197 	vcpu->arch.cpu_type = KVM_CPU_E500MC;
198 
199 	return 0;
200 }
201 
202 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
203 {
204 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
205 
206 	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
207 			       KVM_SREGS_E_PC;
208 	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
209 
210 	sregs->u.e.impl.fsl.features = 0;
211 	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
212 	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
213 	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
214 
215 	kvmppc_get_sregs_e500_tlb(vcpu, sregs);
216 
217 	sregs->u.e.ivor_high[3] =
218 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
219 	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
220 	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
221 
222 	kvmppc_get_sregs_ivor(vcpu, sregs);
223 }
224 
225 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
226 {
227 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
228 	int ret;
229 
230 	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
231 		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
232 		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
233 		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
234 	}
235 
236 	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
237 	if (ret < 0)
238 		return ret;
239 
240 	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
241 		return 0;
242 
243 	if (sregs->u.e.features & KVM_SREGS_E_PM) {
244 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
245 			sregs->u.e.ivor_high[3];
246 	}
247 
248 	if (sregs->u.e.features & KVM_SREGS_E_PC) {
249 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
250 			sregs->u.e.ivor_high[4];
251 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
252 			sregs->u.e.ivor_high[5];
253 	}
254 
255 	return kvmppc_set_sregs_ivor(vcpu, sregs);
256 }
257 
258 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
259 {
260 	struct kvmppc_vcpu_e500 *vcpu_e500;
261 	struct kvm_vcpu *vcpu;
262 	int err;
263 
264 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
265 	if (!vcpu_e500) {
266 		err = -ENOMEM;
267 		goto out;
268 	}
269 	vcpu = &vcpu_e500->vcpu;
270 
271 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
272 	vcpu->arch.oldpir = 0xffffffff;
273 
274 	err = kvm_vcpu_init(vcpu, kvm, id);
275 	if (err)
276 		goto free_vcpu;
277 
278 	err = kvmppc_e500_tlb_init(vcpu_e500);
279 	if (err)
280 		goto uninit_vcpu;
281 
282 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
283 	if (!vcpu->arch.shared)
284 		goto uninit_tlb;
285 
286 	return vcpu;
287 
288 uninit_tlb:
289 	kvmppc_e500_tlb_uninit(vcpu_e500);
290 uninit_vcpu:
291 	kvm_vcpu_uninit(vcpu);
292 
293 free_vcpu:
294 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
295 out:
296 	return ERR_PTR(err);
297 }
298 
299 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
300 {
301 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
302 
303 	free_page((unsigned long)vcpu->arch.shared);
304 	kvmppc_e500_tlb_uninit(vcpu_e500);
305 	kvm_vcpu_uninit(vcpu);
306 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
307 }
308 
309 int kvmppc_core_init_vm(struct kvm *kvm)
310 {
311 	int lpid;
312 
313 	lpid = kvmppc_alloc_lpid();
314 	if (lpid < 0)
315 		return lpid;
316 
317 	kvm->arch.lpid = lpid;
318 	return 0;
319 }
320 
321 void kvmppc_core_destroy_vm(struct kvm *kvm)
322 {
323 	kvmppc_free_lpid(kvm->arch.lpid);
324 }
325 
326 static int __init kvmppc_e500mc_init(void)
327 {
328 	int r;
329 
330 	r = kvmppc_booke_init();
331 	if (r)
332 		return r;
333 
334 	kvmppc_init_lpid(64);
335 	kvmppc_claim_lpid(0); /* host */
336 
337 	return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
338 }
339 
340 static void __exit kvmppc_e500mc_exit(void)
341 {
342 	kvmppc_booke_exit();
343 }
344 
345 module_init(kvmppc_e500mc_init);
346 module_exit(kvmppc_e500mc_exit);
347