xref: /kernel/linux/linux-6.6/arch/powerpc/kvm/e500mc.c (revision 62306a36) 
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#include <asm/ppc-opcode.h>
24
25#include "booke.h"
26#include "e500.h"
27
28void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
29{
30	enum ppc_dbell dbell_type;
31	unsigned long tag;
32
33	switch (type) {
34	case INT_CLASS_NONCRIT:
35		dbell_type = PPC_G_DBELL;
36		break;
37	case INT_CLASS_CRIT:
38		dbell_type = PPC_G_DBELL_CRIT;
39		break;
40	case INT_CLASS_MC:
41		dbell_type = PPC_G_DBELL_MC;
42		break;
43	default:
44		WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
45		return;
46	}
47
48	preempt_disable();
49	tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
50	mb();
51	ppc_msgsnd(dbell_type, 0, tag);
52	preempt_enable();
53}
54
55/* gtlbe must not be mapped by more than one host tlb entry */
56void 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;
62	unsigned long flags;
63
64	ts = get_tlb_ts(gtlbe);
65	tid = get_tlb_tid(gtlbe);
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 | get_lpid(&vcpu_e500->vcpu));
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
90void 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 | get_lpid(&vcpu_e500->vcpu));
96	/*
97	 * clang-17 and older could not assemble tlbilxlpid.
98	 * https://github.com/ClangBuiltLinux/linux/issues/1891
99	 */
100	asm volatile (PPC_TLBILX_LPID);
101	mtspr(SPRN_MAS5, 0);
102	local_irq_restore(flags);
103}
104
105void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
106{
107	vcpu->arch.pid = pid;
108}
109
110void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
111{
112}
113
114/* We use two lpids per VM */
115static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
116
117static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
118{
119	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
120
121	kvmppc_booke_vcpu_load(vcpu, cpu);
122
123	mtspr(SPRN_LPID, get_lpid(vcpu));
124	mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
125	mtspr(SPRN_GPIR, vcpu->vcpu_id);
126	mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
127	vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
128	vcpu->arch.epsc = vcpu->arch.eplc;
129	mtspr(SPRN_EPLC, vcpu->arch.eplc);
130	mtspr(SPRN_EPSC, vcpu->arch.epsc);
131
132	mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
133	mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
134	mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
135	mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
136	mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
137	mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
138	mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
139
140	mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
141	mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
142
143	mtspr(SPRN_GEPR, vcpu->arch.epr);
144	mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
145	mtspr(SPRN_GESR, vcpu->arch.shared->esr);
146
147	if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
148	    __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
149		kvmppc_e500_tlbil_all(vcpu_e500);
150		__this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
151	}
152}
153
154static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
155{
156	vcpu->arch.eplc = mfspr(SPRN_EPLC);
157	vcpu->arch.epsc = mfspr(SPRN_EPSC);
158
159	vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
160	vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
161	vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
162	vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
163
164	vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
165	vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
166
167	vcpu->arch.epr = mfspr(SPRN_GEPR);
168	vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
169	vcpu->arch.shared->esr = mfspr(SPRN_GESR);
170
171	vcpu->arch.oldpir = mfspr(SPRN_PIR);
172
173	kvmppc_booke_vcpu_put(vcpu);
174}
175
176static int kvmppc_e500mc_check_processor_compat(void)
177{
178	int r;
179
180	if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
181		r = 0;
182	else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
183		r = 0;
184#ifdef CONFIG_ALTIVEC
185	/*
186	 * Since guests have the privilege to enable AltiVec, we need AltiVec
187	 * support in the host to save/restore their context.
188	 * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
189	 * because it's cleared in the absence of CONFIG_ALTIVEC!
190	 */
191	else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
192		r = 0;
193#endif
194	else
195		r = -ENOTSUPP;
196
197	return r;
198}
199
200int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
201{
202	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
203
204	vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
205				 SPRN_EPCR_DUVD;
206#ifdef CONFIG_64BIT
207	vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
208#endif
209	vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;
210
211	vcpu->arch.pvr = mfspr(SPRN_PVR);
212	vcpu_e500->svr = mfspr(SPRN_SVR);
213
214	vcpu->arch.cpu_type = KVM_CPU_E500MC;
215
216	return 0;
217}
218
219static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
220					struct kvm_sregs *sregs)
221{
222	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
223
224	sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
225			       KVM_SREGS_E_PC;
226	sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
227
228	sregs->u.e.impl.fsl.features = 0;
229	sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
230	sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
231	sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
232
233	kvmppc_get_sregs_e500_tlb(vcpu, sregs);
234
235	sregs->u.e.ivor_high[3] =
236		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
237	sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
238	sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
239
240	return kvmppc_get_sregs_ivor(vcpu, sregs);
241}
242
243static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
244					struct kvm_sregs *sregs)
245{
246	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
247	int ret;
248
249	if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
250		vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
251		vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
252		vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
253	}
254
255	ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
256	if (ret < 0)
257		return ret;
258
259	if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
260		return 0;
261
262	if (sregs->u.e.features & KVM_SREGS_E_PM) {
263		vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
264			sregs->u.e.ivor_high[3];
265	}
266
267	if (sregs->u.e.features & KVM_SREGS_E_PC) {
268		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
269			sregs->u.e.ivor_high[4];
270		vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
271			sregs->u.e.ivor_high[5];
272	}
273
274	return kvmppc_set_sregs_ivor(vcpu, sregs);
275}
276
277static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
278			      union kvmppc_one_reg *val)
279{
280	int r = 0;
281
282	switch (id) {
283	case KVM_REG_PPC_SPRG9:
284		*val = get_reg_val(id, vcpu->arch.sprg9);
285		break;
286	default:
287		r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
288	}
289
290	return r;
291}
292
293static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
294			      union kvmppc_one_reg *val)
295{
296	int r = 0;
297
298	switch (id) {
299	case KVM_REG_PPC_SPRG9:
300		vcpu->arch.sprg9 = set_reg_val(id, *val);
301		break;
302	default:
303		r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
304	}
305
306	return r;
307}
308
309static int kvmppc_core_vcpu_create_e500mc(struct kvm_vcpu *vcpu)
310{
311	struct kvmppc_vcpu_e500 *vcpu_e500;
312	int err;
313
314	BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
315	vcpu_e500 = to_e500(vcpu);
316
317	/* Invalid PIR value -- this LPID doesn't have valid state on any cpu */
318	vcpu->arch.oldpir = 0xffffffff;
319
320	err = kvmppc_e500_tlb_init(vcpu_e500);
321	if (err)
322		return err;
323
324	vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
325	if (!vcpu->arch.shared) {
326		err = -ENOMEM;
327		goto uninit_tlb;
328	}
329
330	return 0;
331
332uninit_tlb:
333	kvmppc_e500_tlb_uninit(vcpu_e500);
334	return err;
335}
336
337static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
338{
339	struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
340
341	free_page((unsigned long)vcpu->arch.shared);
342	kvmppc_e500_tlb_uninit(vcpu_e500);
343}
344
345static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
346{
347	int lpid;
348
349	lpid = kvmppc_alloc_lpid();
350	if (lpid < 0)
351		return lpid;
352
353	/*
354	 * Use two lpids per VM on cores with two threads like e6500. Use
355	 * even numbers to speedup vcpu lpid computation with consecutive lpids
356	 * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
357	 */
358	if (threads_per_core == 2)
359		lpid <<= 1;
360
361	kvm->arch.lpid = lpid;
362	return 0;
363}
364
365static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
366{
367	int lpid = kvm->arch.lpid;
368
369	if (threads_per_core == 2)
370		lpid >>= 1;
371
372	kvmppc_free_lpid(lpid);
373}
374
375static struct kvmppc_ops kvm_ops_e500mc = {
376	.get_sregs = kvmppc_core_get_sregs_e500mc,
377	.set_sregs = kvmppc_core_set_sregs_e500mc,
378	.get_one_reg = kvmppc_get_one_reg_e500mc,
379	.set_one_reg = kvmppc_set_one_reg_e500mc,
380	.vcpu_load   = kvmppc_core_vcpu_load_e500mc,
381	.vcpu_put    = kvmppc_core_vcpu_put_e500mc,
382	.vcpu_create = kvmppc_core_vcpu_create_e500mc,
383	.vcpu_free   = kvmppc_core_vcpu_free_e500mc,
384	.init_vm = kvmppc_core_init_vm_e500mc,
385	.destroy_vm = kvmppc_core_destroy_vm_e500mc,
386	.emulate_op = kvmppc_core_emulate_op_e500,
387	.emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
388	.emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
389	.create_vcpu_debugfs = kvmppc_create_vcpu_debugfs_e500,
390};
391
392static int __init kvmppc_e500mc_init(void)
393{
394	int r;
395
396	r = kvmppc_e500mc_check_processor_compat();
397	if (r)
398		goto err_out;
399
400	r = kvmppc_booke_init();
401	if (r)
402		goto err_out;
403
404	/*
405	 * Use two lpids per VM on dual threaded processors like e6500
406	 * to workarround the lack of tlb write conditional instruction.
407	 * Expose half the number of available hardware lpids to the lpid
408	 * allocator.
409	 */
410	kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
411
412	r = kvm_init(sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
413	if (r)
414		goto err_out;
415	kvm_ops_e500mc.owner = THIS_MODULE;
416	kvmppc_pr_ops = &kvm_ops_e500mc;
417
418err_out:
419	return r;
420}
421
422static void __exit kvmppc_e500mc_exit(void)
423{
424	kvmppc_pr_ops = NULL;
425	kvmppc_booke_exit();
426}
427
428module_init(kvmppc_e500mc_init);
429module_exit(kvmppc_e500mc_exit);
430MODULE_ALIAS_MISCDEV(KVM_MINOR);
431MODULE_ALIAS("devname:kvm");
432