xref: /linux/arch/powerpc/kvm/e500mc.c (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d) 
1 /*
2  * Copyright (C) 2010 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 	u32 val, eaddr, lpid;
61 	unsigned long flags;
62 
63 	ts = get_tlb_ts(gtlbe);
64 	tid = get_tlb_tid(gtlbe);
65 	lpid = vcpu_e500->vcpu.kvm->arch.lpid;
66 
67 	/* We search the host TLB to invalidate its shadow TLB entry */
68 	val = (tid << 16) | ts;
69 	eaddr = get_tlb_eaddr(gtlbe);
70 
71 	local_irq_save(flags);
72 
73 	mtspr(SPRN_MAS6, val);
74 	mtspr(SPRN_MAS5, MAS5_SGS | lpid);
75 
76 	asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
77 	val = mfspr(SPRN_MAS1);
78 	if (val & MAS1_VALID) {
79 		mtspr(SPRN_MAS1, val & ~MAS1_VALID);
80 		asm volatile("tlbwe");
81 	}
82 	mtspr(SPRN_MAS5, 0);
83 	/* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
84 	mtspr(SPRN_MAS8, 0);
85 	isync();
86 
87 	local_irq_restore(flags);
88 }
89 
90 void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
91 {
92 	unsigned long flags;
93 
94 	local_irq_save(flags);
95 	mtspr(SPRN_MAS5, MAS5_SGS | vcpu_e500->vcpu.kvm->arch.lpid);
96 	asm volatile("tlbilxlpid");
97 	mtspr(SPRN_MAS5, 0);
98 	local_irq_restore(flags);
99 }
100 
101 void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
102 {
103 	vcpu->arch.pid = pid;
104 }
105 
106 void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
107 {
108 }
109 
110 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
111 {
112 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
113 
114 	kvmppc_booke_vcpu_load(vcpu, cpu);
115 
116 	mtspr(SPRN_LPID, vcpu->kvm->arch.lpid);
117 	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
118 	mtspr(SPRN_GPIR, vcpu->vcpu_id);
119 	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
120 	mtspr(SPRN_EPLC, vcpu->arch.eplc);
121 	mtspr(SPRN_EPSC, vcpu->arch.epsc);
122 
123 	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
124 	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
125 	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
126 	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
127 	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
128 	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
129 	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
130 
131 	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
132 	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
133 
134 	mtspr(SPRN_GEPR, vcpu->arch.epr);
135 	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
136 	mtspr(SPRN_GESR, vcpu->arch.shared->esr);
137 
138 	if (vcpu->arch.oldpir != mfspr(SPRN_PIR))
139 		kvmppc_e500_tlbil_all(vcpu_e500);
140 
141 	kvmppc_load_guest_fp(vcpu);
142 }
143 
144 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
145 {
146 	vcpu->arch.eplc = mfspr(SPRN_EPLC);
147 	vcpu->arch.epsc = mfspr(SPRN_EPSC);
148 
149 	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
150 	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
151 	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
152 	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
153 
154 	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
155 	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
156 
157 	vcpu->arch.epr = mfspr(SPRN_GEPR);
158 	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
159 	vcpu->arch.shared->esr = mfspr(SPRN_GESR);
160 
161 	vcpu->arch.oldpir = mfspr(SPRN_PIR);
162 
163 	kvmppc_booke_vcpu_put(vcpu);
164 }
165 
166 int kvmppc_core_check_processor_compat(void)
167 {
168 	int r;
169 
170 	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
171 		r = 0;
172 	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
173 		r = 0;
174 	else
175 		r = -ENOTSUPP;
176 
177 	return r;
178 }
179 
180 int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
181 {
182 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
183 
184 	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
185 				 SPRN_EPCR_DUVD;
186 	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_DEP | MSRP_PMMP;
187 	vcpu->arch.eplc = EPC_EGS | (vcpu->kvm->arch.lpid << EPC_ELPID_SHIFT);
188 	vcpu->arch.epsc = vcpu->arch.eplc;
189 
190 	vcpu->arch.pvr = mfspr(SPRN_PVR);
191 	vcpu_e500->svr = mfspr(SPRN_SVR);
192 
193 	vcpu->arch.cpu_type = KVM_CPU_E500MC;
194 
195 	return 0;
196 }
197 
198 void kvmppc_core_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
199 {
200 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
201 
202 	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
203 			       KVM_SREGS_E_PC;
204 	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
205 
206 	sregs->u.e.impl.fsl.features = 0;
207 	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
208 	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
209 	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
210 
211 	kvmppc_get_sregs_e500_tlb(vcpu, sregs);
212 
213 	sregs->u.e.ivor_high[3] =
214 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
215 	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
216 	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
217 
218 	kvmppc_get_sregs_ivor(vcpu, sregs);
219 }
220 
221 int kvmppc_core_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
222 {
223 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
224 	int ret;
225 
226 	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
227 		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
228 		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
229 		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
230 	}
231 
232 	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
233 	if (ret < 0)
234 		return ret;
235 
236 	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
237 		return 0;
238 
239 	if (sregs->u.e.features & KVM_SREGS_E_PM) {
240 		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
241 			sregs->u.e.ivor_high[3];
242 	}
243 
244 	if (sregs->u.e.features & KVM_SREGS_E_PC) {
245 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
246 			sregs->u.e.ivor_high[4];
247 		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
248 			sregs->u.e.ivor_high[5];
249 	}
250 
251 	return kvmppc_set_sregs_ivor(vcpu, sregs);
252 }
253 
254 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
255 {
256 	struct kvmppc_vcpu_e500 *vcpu_e500;
257 	struct kvm_vcpu *vcpu;
258 	int err;
259 
260 	vcpu_e500 = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
261 	if (!vcpu_e500) {
262 		err = -ENOMEM;
263 		goto out;
264 	}
265 	vcpu = &vcpu_e500->vcpu;
266 
267 	/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
268 	vcpu->arch.oldpir = 0xffffffff;
269 
270 	err = kvm_vcpu_init(vcpu, kvm, id);
271 	if (err)
272 		goto free_vcpu;
273 
274 	err = kvmppc_e500_tlb_init(vcpu_e500);
275 	if (err)
276 		goto uninit_vcpu;
277 
278 	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
279 	if (!vcpu->arch.shared)
280 		goto uninit_tlb;
281 
282 	return vcpu;
283 
284 uninit_tlb:
285 	kvmppc_e500_tlb_uninit(vcpu_e500);
286 uninit_vcpu:
287 	kvm_vcpu_uninit(vcpu);
288 
289 free_vcpu:
290 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
291 out:
292 	return ERR_PTR(err);
293 }
294 
295 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
296 {
297 	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
298 
299 	free_page((unsigned long)vcpu->arch.shared);
300 	kvmppc_e500_tlb_uninit(vcpu_e500);
301 	kvm_vcpu_uninit(vcpu);
302 	kmem_cache_free(kvm_vcpu_cache, vcpu_e500);
303 }
304 
305 int kvmppc_core_init_vm(struct kvm *kvm)
306 {
307 	int lpid;
308 
309 	lpid = kvmppc_alloc_lpid();
310 	if (lpid < 0)
311 		return lpid;
312 
313 	kvm->arch.lpid = lpid;
314 	return 0;
315 }
316 
317 void kvmppc_core_destroy_vm(struct kvm *kvm)
318 {
319 	kvmppc_free_lpid(kvm->arch.lpid);
320 }
321 
322 static int __init kvmppc_e500mc_init(void)
323 {
324 	int r;
325 
326 	r = kvmppc_booke_init();
327 	if (r)
328 		return r;
329 
330 	kvmppc_init_lpid(64);
331 	kvmppc_claim_lpid(0); /* host */
332 
333 	return kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
334 }
335 
336 static void __exit kvmppc_e500mc_exit(void)
337 {
338 	kvmppc_booke_exit();
339 }
340 
341 module_init(kvmppc_e500mc_init);
342 module_exit(kvmppc_e500mc_exit);
343