1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2020 - Google Inc
4 * Author: Andrew Scull <ascull@google.com>
5 */
6
7 #include <hyp/adjust_pc.h>
8
9 #include <asm/pgtable-types.h>
10 #include <asm/kvm_asm.h>
11 #include <asm/kvm_emulate.h>
12 #include <asm/kvm_host.h>
13 #include <asm/kvm_hyp.h>
14 #include <asm/kvm_mmu.h>
15
16 #include <nvhe/ffa.h>
17 #include <nvhe/mem_protect.h>
18 #include <nvhe/mm.h>
19 #include <nvhe/pkvm.h>
20 #include <nvhe/trap_handler.h>
21
22 DEFINE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
23
24 void __kvm_hyp_host_forward_smc(struct kvm_cpu_context *host_ctxt);
25
flush_hyp_vcpu(struct pkvm_hyp_vcpu * hyp_vcpu)26 static void flush_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
27 {
28 struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
29
30 hyp_vcpu->vcpu.arch.ctxt = host_vcpu->arch.ctxt;
31
32 hyp_vcpu->vcpu.arch.sve_state = kern_hyp_va(host_vcpu->arch.sve_state);
33 hyp_vcpu->vcpu.arch.sve_max_vl = host_vcpu->arch.sve_max_vl;
34
35 hyp_vcpu->vcpu.arch.hw_mmu = host_vcpu->arch.hw_mmu;
36
37 hyp_vcpu->vcpu.arch.hcr_el2 = host_vcpu->arch.hcr_el2;
38 hyp_vcpu->vcpu.arch.mdcr_el2 = host_vcpu->arch.mdcr_el2;
39 hyp_vcpu->vcpu.arch.cptr_el2 = host_vcpu->arch.cptr_el2;
40
41 hyp_vcpu->vcpu.arch.iflags = host_vcpu->arch.iflags;
42 hyp_vcpu->vcpu.arch.fp_state = host_vcpu->arch.fp_state;
43
44 hyp_vcpu->vcpu.arch.debug_ptr = kern_hyp_va(host_vcpu->arch.debug_ptr);
45 hyp_vcpu->vcpu.arch.host_fpsimd_state = host_vcpu->arch.host_fpsimd_state;
46
47 hyp_vcpu->vcpu.arch.vsesr_el2 = host_vcpu->arch.vsesr_el2;
48
49 hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3 = host_vcpu->arch.vgic_cpu.vgic_v3;
50 }
51
sync_hyp_vcpu(struct pkvm_hyp_vcpu * hyp_vcpu)52 static void sync_hyp_vcpu(struct pkvm_hyp_vcpu *hyp_vcpu)
53 {
54 struct kvm_vcpu *host_vcpu = hyp_vcpu->host_vcpu;
55 struct vgic_v3_cpu_if *hyp_cpu_if = &hyp_vcpu->vcpu.arch.vgic_cpu.vgic_v3;
56 struct vgic_v3_cpu_if *host_cpu_if = &host_vcpu->arch.vgic_cpu.vgic_v3;
57 unsigned int i;
58
59 host_vcpu->arch.ctxt = hyp_vcpu->vcpu.arch.ctxt;
60
61 host_vcpu->arch.hcr_el2 = hyp_vcpu->vcpu.arch.hcr_el2;
62 host_vcpu->arch.cptr_el2 = hyp_vcpu->vcpu.arch.cptr_el2;
63
64 host_vcpu->arch.fault = hyp_vcpu->vcpu.arch.fault;
65
66 host_vcpu->arch.iflags = hyp_vcpu->vcpu.arch.iflags;
67 host_vcpu->arch.fp_state = hyp_vcpu->vcpu.arch.fp_state;
68
69 host_cpu_if->vgic_hcr = hyp_cpu_if->vgic_hcr;
70 for (i = 0; i < hyp_cpu_if->used_lrs; ++i)
71 host_cpu_if->vgic_lr[i] = hyp_cpu_if->vgic_lr[i];
72 }
73
handle___kvm_vcpu_run(struct kvm_cpu_context * host_ctxt)74 static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt)
75 {
76 DECLARE_REG(struct kvm_vcpu *, host_vcpu, host_ctxt, 1);
77 int ret;
78
79 host_vcpu = kern_hyp_va(host_vcpu);
80
81 if (unlikely(is_protected_kvm_enabled())) {
82 struct pkvm_hyp_vcpu *hyp_vcpu;
83 struct kvm *host_kvm;
84
85 host_kvm = kern_hyp_va(host_vcpu->kvm);
86 hyp_vcpu = pkvm_load_hyp_vcpu(host_kvm->arch.pkvm.handle,
87 host_vcpu->vcpu_idx);
88 if (!hyp_vcpu) {
89 ret = -EINVAL;
90 goto out;
91 }
92
93 flush_hyp_vcpu(hyp_vcpu);
94
95 ret = __kvm_vcpu_run(&hyp_vcpu->vcpu);
96
97 sync_hyp_vcpu(hyp_vcpu);
98 pkvm_put_hyp_vcpu(hyp_vcpu);
99 } else {
100 /* The host is fully trusted, run its vCPU directly. */
101 ret = __kvm_vcpu_run(host_vcpu);
102 }
103
104 out:
105 cpu_reg(host_ctxt, 1) = ret;
106 }
107
handle___kvm_adjust_pc(struct kvm_cpu_context * host_ctxt)108 static void handle___kvm_adjust_pc(struct kvm_cpu_context *host_ctxt)
109 {
110 DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
111
112 __kvm_adjust_pc(kern_hyp_va(vcpu));
113 }
114
handle___kvm_flush_vm_context(struct kvm_cpu_context * host_ctxt)115 static void handle___kvm_flush_vm_context(struct kvm_cpu_context *host_ctxt)
116 {
117 __kvm_flush_vm_context();
118 }
119
handle___kvm_tlb_flush_vmid_ipa(struct kvm_cpu_context * host_ctxt)120 static void handle___kvm_tlb_flush_vmid_ipa(struct kvm_cpu_context *host_ctxt)
121 {
122 DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
123 DECLARE_REG(phys_addr_t, ipa, host_ctxt, 2);
124 DECLARE_REG(int, level, host_ctxt, 3);
125
126 __kvm_tlb_flush_vmid_ipa(kern_hyp_va(mmu), ipa, level);
127 }
128
handle___kvm_tlb_flush_vmid_ipa_nsh(struct kvm_cpu_context * host_ctxt)129 static void handle___kvm_tlb_flush_vmid_ipa_nsh(struct kvm_cpu_context *host_ctxt)
130 {
131 DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
132 DECLARE_REG(phys_addr_t, ipa, host_ctxt, 2);
133 DECLARE_REG(int, level, host_ctxt, 3);
134
135 __kvm_tlb_flush_vmid_ipa_nsh(kern_hyp_va(mmu), ipa, level);
136 }
137
138 static void
handle___kvm_tlb_flush_vmid_range(struct kvm_cpu_context * host_ctxt)139 handle___kvm_tlb_flush_vmid_range(struct kvm_cpu_context *host_ctxt)
140 {
141 DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
142 DECLARE_REG(phys_addr_t, start, host_ctxt, 2);
143 DECLARE_REG(unsigned long, pages, host_ctxt, 3);
144
145 __kvm_tlb_flush_vmid_range(kern_hyp_va(mmu), start, pages);
146 }
147
handle___kvm_tlb_flush_vmid(struct kvm_cpu_context * host_ctxt)148 static void handle___kvm_tlb_flush_vmid(struct kvm_cpu_context *host_ctxt)
149 {
150 DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
151
152 __kvm_tlb_flush_vmid(kern_hyp_va(mmu));
153 }
154
handle___kvm_flush_cpu_context(struct kvm_cpu_context * host_ctxt)155 static void handle___kvm_flush_cpu_context(struct kvm_cpu_context *host_ctxt)
156 {
157 DECLARE_REG(struct kvm_s2_mmu *, mmu, host_ctxt, 1);
158
159 __kvm_flush_cpu_context(kern_hyp_va(mmu));
160 }
161
handle___kvm_timer_set_cntvoff(struct kvm_cpu_context * host_ctxt)162 static void handle___kvm_timer_set_cntvoff(struct kvm_cpu_context *host_ctxt)
163 {
164 __kvm_timer_set_cntvoff(cpu_reg(host_ctxt, 1));
165 }
166
handle___kvm_enable_ssbs(struct kvm_cpu_context * host_ctxt)167 static void handle___kvm_enable_ssbs(struct kvm_cpu_context *host_ctxt)
168 {
169 u64 tmp;
170
171 tmp = read_sysreg_el2(SYS_SCTLR);
172 tmp |= SCTLR_ELx_DSSBS;
173 write_sysreg_el2(tmp, SYS_SCTLR);
174 }
175
handle___vgic_v3_get_gic_config(struct kvm_cpu_context * host_ctxt)176 static void handle___vgic_v3_get_gic_config(struct kvm_cpu_context *host_ctxt)
177 {
178 cpu_reg(host_ctxt, 1) = __vgic_v3_get_gic_config();
179 }
180
handle___vgic_v3_read_vmcr(struct kvm_cpu_context * host_ctxt)181 static void handle___vgic_v3_read_vmcr(struct kvm_cpu_context *host_ctxt)
182 {
183 cpu_reg(host_ctxt, 1) = __vgic_v3_read_vmcr();
184 }
185
handle___vgic_v3_write_vmcr(struct kvm_cpu_context * host_ctxt)186 static void handle___vgic_v3_write_vmcr(struct kvm_cpu_context *host_ctxt)
187 {
188 __vgic_v3_write_vmcr(cpu_reg(host_ctxt, 1));
189 }
190
handle___vgic_v3_init_lrs(struct kvm_cpu_context * host_ctxt)191 static void handle___vgic_v3_init_lrs(struct kvm_cpu_context *host_ctxt)
192 {
193 __vgic_v3_init_lrs();
194 }
195
handle___kvm_get_mdcr_el2(struct kvm_cpu_context * host_ctxt)196 static void handle___kvm_get_mdcr_el2(struct kvm_cpu_context *host_ctxt)
197 {
198 cpu_reg(host_ctxt, 1) = __kvm_get_mdcr_el2();
199 }
200
handle___vgic_v3_save_aprs(struct kvm_cpu_context * host_ctxt)201 static void handle___vgic_v3_save_aprs(struct kvm_cpu_context *host_ctxt)
202 {
203 DECLARE_REG(struct vgic_v3_cpu_if *, cpu_if, host_ctxt, 1);
204
205 __vgic_v3_save_aprs(kern_hyp_va(cpu_if));
206 }
207
handle___vgic_v3_restore_aprs(struct kvm_cpu_context * host_ctxt)208 static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
209 {
210 DECLARE_REG(struct vgic_v3_cpu_if *, cpu_if, host_ctxt, 1);
211
212 __vgic_v3_restore_aprs(kern_hyp_va(cpu_if));
213 }
214
handle___pkvm_init(struct kvm_cpu_context * host_ctxt)215 static void handle___pkvm_init(struct kvm_cpu_context *host_ctxt)
216 {
217 DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
218 DECLARE_REG(unsigned long, size, host_ctxt, 2);
219 DECLARE_REG(unsigned long, nr_cpus, host_ctxt, 3);
220 DECLARE_REG(unsigned long *, per_cpu_base, host_ctxt, 4);
221 DECLARE_REG(u32, hyp_va_bits, host_ctxt, 5);
222
223 /*
224 * __pkvm_init() will return only if an error occurred, otherwise it
225 * will tail-call in __pkvm_init_finalise() which will have to deal
226 * with the host context directly.
227 */
228 cpu_reg(host_ctxt, 1) = __pkvm_init(phys, size, nr_cpus, per_cpu_base,
229 hyp_va_bits);
230 }
231
handle___pkvm_cpu_set_vector(struct kvm_cpu_context * host_ctxt)232 static void handle___pkvm_cpu_set_vector(struct kvm_cpu_context *host_ctxt)
233 {
234 DECLARE_REG(enum arm64_hyp_spectre_vector, slot, host_ctxt, 1);
235
236 cpu_reg(host_ctxt, 1) = pkvm_cpu_set_vector(slot);
237 }
238
handle___pkvm_host_share_hyp(struct kvm_cpu_context * host_ctxt)239 static void handle___pkvm_host_share_hyp(struct kvm_cpu_context *host_ctxt)
240 {
241 DECLARE_REG(u64, pfn, host_ctxt, 1);
242
243 cpu_reg(host_ctxt, 1) = __pkvm_host_share_hyp(pfn);
244 }
245
handle___pkvm_host_unshare_hyp(struct kvm_cpu_context * host_ctxt)246 static void handle___pkvm_host_unshare_hyp(struct kvm_cpu_context *host_ctxt)
247 {
248 DECLARE_REG(u64, pfn, host_ctxt, 1);
249
250 cpu_reg(host_ctxt, 1) = __pkvm_host_unshare_hyp(pfn);
251 }
252
handle___pkvm_create_private_mapping(struct kvm_cpu_context * host_ctxt)253 static void handle___pkvm_create_private_mapping(struct kvm_cpu_context *host_ctxt)
254 {
255 DECLARE_REG(phys_addr_t, phys, host_ctxt, 1);
256 DECLARE_REG(size_t, size, host_ctxt, 2);
257 DECLARE_REG(enum kvm_pgtable_prot, prot, host_ctxt, 3);
258
259 /*
260 * __pkvm_create_private_mapping() populates a pointer with the
261 * hypervisor start address of the allocation.
262 *
263 * However, handle___pkvm_create_private_mapping() hypercall crosses the
264 * EL1/EL2 boundary so the pointer would not be valid in this context.
265 *
266 * Instead pass the allocation address as the return value (or return
267 * ERR_PTR() on failure).
268 */
269 unsigned long haddr;
270 int err = __pkvm_create_private_mapping(phys, size, prot, &haddr);
271
272 if (err)
273 haddr = (unsigned long)ERR_PTR(err);
274
275 cpu_reg(host_ctxt, 1) = haddr;
276 }
277
handle___pkvm_prot_finalize(struct kvm_cpu_context * host_ctxt)278 static void handle___pkvm_prot_finalize(struct kvm_cpu_context *host_ctxt)
279 {
280 cpu_reg(host_ctxt, 1) = __pkvm_prot_finalize();
281 }
282
handle___pkvm_vcpu_init_traps(struct kvm_cpu_context * host_ctxt)283 static void handle___pkvm_vcpu_init_traps(struct kvm_cpu_context *host_ctxt)
284 {
285 DECLARE_REG(struct kvm_vcpu *, vcpu, host_ctxt, 1);
286
287 __pkvm_vcpu_init_traps(kern_hyp_va(vcpu));
288 }
289
handle___pkvm_init_vm(struct kvm_cpu_context * host_ctxt)290 static void handle___pkvm_init_vm(struct kvm_cpu_context *host_ctxt)
291 {
292 DECLARE_REG(struct kvm *, host_kvm, host_ctxt, 1);
293 DECLARE_REG(unsigned long, vm_hva, host_ctxt, 2);
294 DECLARE_REG(unsigned long, pgd_hva, host_ctxt, 3);
295
296 host_kvm = kern_hyp_va(host_kvm);
297 cpu_reg(host_ctxt, 1) = __pkvm_init_vm(host_kvm, vm_hva, pgd_hva);
298 }
299
handle___pkvm_init_vcpu(struct kvm_cpu_context * host_ctxt)300 static void handle___pkvm_init_vcpu(struct kvm_cpu_context *host_ctxt)
301 {
302 DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
303 DECLARE_REG(struct kvm_vcpu *, host_vcpu, host_ctxt, 2);
304 DECLARE_REG(unsigned long, vcpu_hva, host_ctxt, 3);
305
306 host_vcpu = kern_hyp_va(host_vcpu);
307 cpu_reg(host_ctxt, 1) = __pkvm_init_vcpu(handle, host_vcpu, vcpu_hva);
308 }
309
handle___pkvm_teardown_vm(struct kvm_cpu_context * host_ctxt)310 static void handle___pkvm_teardown_vm(struct kvm_cpu_context *host_ctxt)
311 {
312 DECLARE_REG(pkvm_handle_t, handle, host_ctxt, 1);
313
314 cpu_reg(host_ctxt, 1) = __pkvm_teardown_vm(handle);
315 }
316
317 typedef void (*hcall_t)(struct kvm_cpu_context *);
318
319 #define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
320
321 static const hcall_t host_hcall[] = {
322 /* ___kvm_hyp_init */
323 HANDLE_FUNC(__kvm_get_mdcr_el2),
324 HANDLE_FUNC(__pkvm_init),
325 HANDLE_FUNC(__pkvm_create_private_mapping),
326 HANDLE_FUNC(__pkvm_cpu_set_vector),
327 HANDLE_FUNC(__kvm_enable_ssbs),
328 HANDLE_FUNC(__vgic_v3_init_lrs),
329 HANDLE_FUNC(__vgic_v3_get_gic_config),
330 HANDLE_FUNC(__pkvm_prot_finalize),
331
332 HANDLE_FUNC(__pkvm_host_share_hyp),
333 HANDLE_FUNC(__pkvm_host_unshare_hyp),
334 HANDLE_FUNC(__kvm_adjust_pc),
335 HANDLE_FUNC(__kvm_vcpu_run),
336 HANDLE_FUNC(__kvm_flush_vm_context),
337 HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
338 HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa_nsh),
339 HANDLE_FUNC(__kvm_tlb_flush_vmid),
340 HANDLE_FUNC(__kvm_tlb_flush_vmid_range),
341 HANDLE_FUNC(__kvm_flush_cpu_context),
342 HANDLE_FUNC(__kvm_timer_set_cntvoff),
343 HANDLE_FUNC(__vgic_v3_read_vmcr),
344 HANDLE_FUNC(__vgic_v3_write_vmcr),
345 HANDLE_FUNC(__vgic_v3_save_aprs),
346 HANDLE_FUNC(__vgic_v3_restore_aprs),
347 HANDLE_FUNC(__pkvm_vcpu_init_traps),
348 HANDLE_FUNC(__pkvm_init_vm),
349 HANDLE_FUNC(__pkvm_init_vcpu),
350 HANDLE_FUNC(__pkvm_teardown_vm),
351 };
352
handle_host_hcall(struct kvm_cpu_context * host_ctxt)353 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
354 {
355 DECLARE_REG(unsigned long, id, host_ctxt, 0);
356 unsigned long hcall_min = 0;
357 hcall_t hfn;
358
359 /*
360 * If pKVM has been initialised then reject any calls to the
361 * early "privileged" hypercalls. Note that we cannot reject
362 * calls to __pkvm_prot_finalize for two reasons: (1) The static
363 * key used to determine initialisation must be toggled prior to
364 * finalisation and (2) finalisation is performed on a per-CPU
365 * basis. This is all fine, however, since __pkvm_prot_finalize
366 * returns -EPERM after the first call for a given CPU.
367 */
368 if (static_branch_unlikely(&kvm_protected_mode_initialized))
369 hcall_min = __KVM_HOST_SMCCC_FUNC___pkvm_prot_finalize;
370
371 id &= ~ARM_SMCCC_CALL_HINTS;
372 id -= KVM_HOST_SMCCC_ID(0);
373
374 if (unlikely(id < hcall_min || id >= ARRAY_SIZE(host_hcall)))
375 goto inval;
376
377 hfn = host_hcall[id];
378 if (unlikely(!hfn))
379 goto inval;
380
381 cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
382 hfn(host_ctxt);
383
384 return;
385 inval:
386 cpu_reg(host_ctxt, 0) = SMCCC_RET_NOT_SUPPORTED;
387 }
388
default_host_smc_handler(struct kvm_cpu_context * host_ctxt)389 static void default_host_smc_handler(struct kvm_cpu_context *host_ctxt)
390 {
391 __kvm_hyp_host_forward_smc(host_ctxt);
392 }
393
handle_host_smc(struct kvm_cpu_context * host_ctxt)394 static void handle_host_smc(struct kvm_cpu_context *host_ctxt)
395 {
396 DECLARE_REG(u64, func_id, host_ctxt, 0);
397 bool handled;
398
399 func_id &= ~ARM_SMCCC_CALL_HINTS;
400
401 handled = kvm_host_psci_handler(host_ctxt, func_id);
402 if (!handled)
403 handled = kvm_host_ffa_handler(host_ctxt, func_id);
404 if (!handled)
405 default_host_smc_handler(host_ctxt);
406
407 /* SMC was trapped, move ELR past the current PC. */
408 kvm_skip_host_instr();
409 }
410
handle_trap(struct kvm_cpu_context * host_ctxt)411 void handle_trap(struct kvm_cpu_context *host_ctxt)
412 {
413 u64 esr = read_sysreg_el2(SYS_ESR);
414
415 switch (ESR_ELx_EC(esr)) {
416 case ESR_ELx_EC_HVC64:
417 handle_host_hcall(host_ctxt);
418 break;
419 case ESR_ELx_EC_SMC64:
420 handle_host_smc(host_ctxt);
421 break;
422 case ESR_ELx_EC_SVE:
423 if (has_hvhe())
424 sysreg_clear_set(cpacr_el1, 0, (CPACR_EL1_ZEN_EL1EN |
425 CPACR_EL1_ZEN_EL0EN));
426 else
427 sysreg_clear_set(cptr_el2, CPTR_EL2_TZ, 0);
428 isb();
429 sve_cond_update_zcr_vq(ZCR_ELx_LEN_MASK, SYS_ZCR_EL2);
430 break;
431 case ESR_ELx_EC_IABT_LOW:
432 case ESR_ELx_EC_DABT_LOW:
433 handle_host_mem_abort(host_ctxt);
434 break;
435 default:
436 BUG();
437 }
438 }
439