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1/*
2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
4 *
5 * Derived from arch/arm/kvm/handle_exit.c:
6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
7 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include <linux/kvm.h>
23#include <linux/kvm_host.h>
24
25#include <kvm/arm_psci.h>
26
27#include <asm/esr.h>
28#include <asm/exception.h>
29#include <asm/kvm_asm.h>
30#include <asm/kvm_coproc.h>
31#include <asm/kvm_emulate.h>
32#include <asm/kvm_mmu.h>
33#include <asm/debug-monitors.h>
34#include <asm/traps.h>
35
36#define CREATE_TRACE_POINTS
37#include "trace.h"
38
39typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
40
41static void kvm_handle_guest_serror(struct kvm_vcpu *vcpu, u32 esr)
42{
43 if (!arm64_is_ras_serror(esr) || arm64_is_fatal_ras_serror(NULL, esr))
44 kvm_inject_vabt(vcpu);
45}
46
47static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
48{
49 int ret;
50
51 trace_kvm_hvc_arm64(*vcpu_pc(vcpu), vcpu_get_reg(vcpu, 0),
52 kvm_vcpu_hvc_get_imm(vcpu));
53 vcpu->stat.hvc_exit_stat++;
54
55 ret = kvm_hvc_call_handler(vcpu);
56 if (ret < 0) {
57 vcpu_set_reg(vcpu, 0, ~0UL);
58 return 1;
59 }
60
61 return ret;
62}
63
64static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
65{
66 /*
67 * "If an SMC instruction executed at Non-secure EL1 is
68 * trapped to EL2 because HCR_EL2.TSC is 1, the exception is a
69 * Trap exception, not a Secure Monitor Call exception [...]"
70 *
71 * We need to advance the PC after the trap, as it would
72 * otherwise return to the same address...
73 */
74 vcpu_set_reg(vcpu, 0, ~0UL);
75 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
76 return 1;
77}
78
79/*
80 * Guest access to FP/ASIMD registers are routed to this handler only
81 * when the system doesn't support FP/ASIMD.
82 */
83static int handle_no_fpsimd(struct kvm_vcpu *vcpu, struct kvm_run *run)
84{
85 kvm_inject_undefined(vcpu);
86 return 1;
87}
88
89/**
90 * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
91 * instruction executed by a guest
92 *
93 * @vcpu: the vcpu pointer
94 *
95 * WFE: Yield the CPU and come back to this vcpu when the scheduler
96 * decides to.
97 * WFI: Simply call kvm_vcpu_block(), which will halt execution of
98 * world-switches and schedule other host processes until there is an
99 * incoming IRQ or FIQ to the VM.
100 */
101static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
102{
103 if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE) {
104 trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
105 vcpu->stat.wfe_exit_stat++;
106 kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
107 } else {
108 trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
109 vcpu->stat.wfi_exit_stat++;
110 kvm_vcpu_block(vcpu);
111 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
112 }
113
114 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
115
116 return 1;
117}
118
119/**
120 * kvm_handle_guest_debug - handle a debug exception instruction
121 *
122 * @vcpu: the vcpu pointer
123 * @run: access to the kvm_run structure for results
124 *
125 * We route all debug exceptions through the same handler. If both the
126 * guest and host are using the same debug facilities it will be up to
127 * userspace to re-inject the correct exception for guest delivery.
128 *
129 * @return: 0 (while setting run->exit_reason), -1 for error
130 */
131static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
132{
133 u32 hsr = kvm_vcpu_get_hsr(vcpu);
134 int ret = 0;
135
136 run->exit_reason = KVM_EXIT_DEBUG;
137 run->debug.arch.hsr = hsr;
138
139 switch (ESR_ELx_EC(hsr)) {
140 case ESR_ELx_EC_WATCHPT_LOW:
141 run->debug.arch.far = vcpu->arch.fault.far_el2;
142 /* fall through */
143 case ESR_ELx_EC_SOFTSTP_LOW:
144 case ESR_ELx_EC_BREAKPT_LOW:
145 case ESR_ELx_EC_BKPT32:
146 case ESR_ELx_EC_BRK64:
147 break;
148 default:
149 kvm_err("%s: un-handled case hsr: %#08x\n",
150 __func__, (unsigned int) hsr);
151 ret = -1;
152 break;
153 }
154
155 return ret;
156}
157
158static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run)
159{
160 u32 hsr = kvm_vcpu_get_hsr(vcpu);
161
162 kvm_pr_unimpl("Unknown exception class: hsr: %#08x -- %s\n",
163 hsr, esr_get_class_string(hsr));
164
165 kvm_inject_undefined(vcpu);
166 return 1;
167}
168
169static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run)
170{
171 /* Until SVE is supported for guests: */
172 kvm_inject_undefined(vcpu);
173 return 1;
174}
175
176static exit_handle_fn arm_exit_handlers[] = {
177 [0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec,
178 [ESR_ELx_EC_WFx] = kvm_handle_wfx,
179 [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32,
180 [ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64,
181 [ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32,
182 [ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store,
183 [ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64,
184 [ESR_ELx_EC_HVC32] = handle_hvc,
185 [ESR_ELx_EC_SMC32] = handle_smc,
186 [ESR_ELx_EC_HVC64] = handle_hvc,
187 [ESR_ELx_EC_SMC64] = handle_smc,
188 [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
189 [ESR_ELx_EC_SVE] = handle_sve,
190 [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
191 [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
192 [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,
193 [ESR_ELx_EC_WATCHPT_LOW]= kvm_handle_guest_debug,
194 [ESR_ELx_EC_BREAKPT_LOW]= kvm_handle_guest_debug,
195 [ESR_ELx_EC_BKPT32] = kvm_handle_guest_debug,
196 [ESR_ELx_EC_BRK64] = kvm_handle_guest_debug,
197 [ESR_ELx_EC_FP_ASIMD] = handle_no_fpsimd,
198};
199
200static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
201{
202 u32 hsr = kvm_vcpu_get_hsr(vcpu);
203 u8 hsr_ec = ESR_ELx_EC(hsr);
204
205 return arm_exit_handlers[hsr_ec];
206}
207
208/*
209 * We may be single-stepping an emulated instruction. If the emulation
210 * has been completed in the kernel, we can return to userspace with a
211 * KVM_EXIT_DEBUG, otherwise userspace needs to complete its
212 * emulation first.
213 */
214static int handle_trap_exceptions(struct kvm_vcpu *vcpu, struct kvm_run *run)
215{
216 int handled;
217
218 /*
219 * See ARM ARM B1.14.1: "Hyp traps on instructions
220 * that fail their condition code check"
221 */
222 if (!kvm_condition_valid(vcpu)) {
223 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
224 handled = 1;
225 } else {
226 exit_handle_fn exit_handler;
227
228 exit_handler = kvm_get_exit_handler(vcpu);
229 handled = exit_handler(vcpu, run);
230 }
231
232 /*
233 * kvm_arm_handle_step_debug() sets the exit_reason on the kvm_run
234 * structure if we need to return to userspace.
235 */
236 if (handled > 0 && kvm_arm_handle_step_debug(vcpu, run))
237 handled = 0;
238
239 return handled;
240}
241
242/*
243 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
244 * proper exit to userspace.
245 */
246int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
247 int exception_index)
248{
249 if (ARM_SERROR_PENDING(exception_index)) {
250 u8 hsr_ec = ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
251
252 /*
253 * HVC/SMC already have an adjusted PC, which we need
254 * to correct in order to return to after having
255 * injected the SError.
256 */
257 if (hsr_ec == ESR_ELx_EC_HVC32 || hsr_ec == ESR_ELx_EC_HVC64 ||
258 hsr_ec == ESR_ELx_EC_SMC32 || hsr_ec == ESR_ELx_EC_SMC64) {
259 u32 adj = kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2;
260 *vcpu_pc(vcpu) -= adj;
261 }
262
263 return 1;
264 }
265
266 exception_index = ARM_EXCEPTION_CODE(exception_index);
267
268 switch (exception_index) {
269 case ARM_EXCEPTION_IRQ:
270 return 1;
271 case ARM_EXCEPTION_EL1_SERROR:
272 /* We may still need to return for single-step */
273 if (!(*vcpu_cpsr(vcpu) & DBG_SPSR_SS)
274 && kvm_arm_handle_step_debug(vcpu, run))
275 return 0;
276 else
277 return 1;
278 case ARM_EXCEPTION_TRAP:
279 return handle_trap_exceptions(vcpu, run);
280 case ARM_EXCEPTION_HYP_GONE:
281 /*
282 * EL2 has been reset to the hyp-stub. This happens when a guest
283 * is pre-empted by kvm_reboot()'s shutdown call.
284 */
285 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
286 return 0;
287 default:
288 kvm_pr_unimpl("Unsupported exception type: %d",
289 exception_index);
290 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
291 return 0;
292 }
293}
294
295/* For exit types that need handling before we can be preempted */
296void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
297 int exception_index)
298{
299 if (ARM_SERROR_PENDING(exception_index)) {
300 if (this_cpu_has_cap(ARM64_HAS_RAS_EXTN)) {
301 u64 disr = kvm_vcpu_get_disr(vcpu);
302
303 kvm_handle_guest_serror(vcpu, disr_to_esr(disr));
304 } else {
305 kvm_inject_vabt(vcpu);
306 }
307
308 return;
309 }
310
311 exception_index = ARM_EXCEPTION_CODE(exception_index);
312
313 if (exception_index == ARM_EXCEPTION_EL1_SERROR)
314 kvm_handle_guest_serror(vcpu, kvm_vcpu_get_hsr(vcpu));
315}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012,2013 - ARM Ltd
4 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 *
6 * Derived from arch/arm/kvm/handle_exit.c:
7 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
8 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
9 */
10
11#include <linux/kvm.h>
12#include <linux/kvm_host.h>
13
14#include <kvm/arm_psci.h>
15
16#include <asm/esr.h>
17#include <asm/exception.h>
18#include <asm/kvm_asm.h>
19#include <asm/kvm_coproc.h>
20#include <asm/kvm_emulate.h>
21#include <asm/kvm_mmu.h>
22#include <asm/debug-monitors.h>
23#include <asm/traps.h>
24
25#define CREATE_TRACE_POINTS
26#include "trace.h"
27
28typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
29
30static void kvm_handle_guest_serror(struct kvm_vcpu *vcpu, u32 esr)
31{
32 if (!arm64_is_ras_serror(esr) || arm64_is_fatal_ras_serror(NULL, esr))
33 kvm_inject_vabt(vcpu);
34}
35
36static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
37{
38 int ret;
39
40 trace_kvm_hvc_arm64(*vcpu_pc(vcpu), vcpu_get_reg(vcpu, 0),
41 kvm_vcpu_hvc_get_imm(vcpu));
42 vcpu->stat.hvc_exit_stat++;
43
44 ret = kvm_hvc_call_handler(vcpu);
45 if (ret < 0) {
46 vcpu_set_reg(vcpu, 0, ~0UL);
47 return 1;
48 }
49
50 return ret;
51}
52
53static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
54{
55 /*
56 * "If an SMC instruction executed at Non-secure EL1 is
57 * trapped to EL2 because HCR_EL2.TSC is 1, the exception is a
58 * Trap exception, not a Secure Monitor Call exception [...]"
59 *
60 * We need to advance the PC after the trap, as it would
61 * otherwise return to the same address...
62 */
63 vcpu_set_reg(vcpu, 0, ~0UL);
64 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
65 return 1;
66}
67
68/*
69 * Guest access to FP/ASIMD registers are routed to this handler only
70 * when the system doesn't support FP/ASIMD.
71 */
72static int handle_no_fpsimd(struct kvm_vcpu *vcpu, struct kvm_run *run)
73{
74 kvm_inject_undefined(vcpu);
75 return 1;
76}
77
78/**
79 * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
80 * instruction executed by a guest
81 *
82 * @vcpu: the vcpu pointer
83 *
84 * WFE: Yield the CPU and come back to this vcpu when the scheduler
85 * decides to.
86 * WFI: Simply call kvm_vcpu_block(), which will halt execution of
87 * world-switches and schedule other host processes until there is an
88 * incoming IRQ or FIQ to the VM.
89 */
90static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
91{
92 if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE) {
93 trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true);
94 vcpu->stat.wfe_exit_stat++;
95 kvm_vcpu_on_spin(vcpu, vcpu_mode_priv(vcpu));
96 } else {
97 trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false);
98 vcpu->stat.wfi_exit_stat++;
99 kvm_vcpu_block(vcpu);
100 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
101 }
102
103 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
104
105 return 1;
106}
107
108/**
109 * kvm_handle_guest_debug - handle a debug exception instruction
110 *
111 * @vcpu: the vcpu pointer
112 * @run: access to the kvm_run structure for results
113 *
114 * We route all debug exceptions through the same handler. If both the
115 * guest and host are using the same debug facilities it will be up to
116 * userspace to re-inject the correct exception for guest delivery.
117 *
118 * @return: 0 (while setting run->exit_reason), -1 for error
119 */
120static int kvm_handle_guest_debug(struct kvm_vcpu *vcpu, struct kvm_run *run)
121{
122 u32 hsr = kvm_vcpu_get_hsr(vcpu);
123 int ret = 0;
124
125 run->exit_reason = KVM_EXIT_DEBUG;
126 run->debug.arch.hsr = hsr;
127
128 switch (ESR_ELx_EC(hsr)) {
129 case ESR_ELx_EC_WATCHPT_LOW:
130 run->debug.arch.far = vcpu->arch.fault.far_el2;
131 /* fall through */
132 case ESR_ELx_EC_SOFTSTP_LOW:
133 case ESR_ELx_EC_BREAKPT_LOW:
134 case ESR_ELx_EC_BKPT32:
135 case ESR_ELx_EC_BRK64:
136 break;
137 default:
138 kvm_err("%s: un-handled case hsr: %#08x\n",
139 __func__, (unsigned int) hsr);
140 ret = -1;
141 break;
142 }
143
144 return ret;
145}
146
147static int kvm_handle_unknown_ec(struct kvm_vcpu *vcpu, struct kvm_run *run)
148{
149 u32 hsr = kvm_vcpu_get_hsr(vcpu);
150
151 kvm_pr_unimpl("Unknown exception class: hsr: %#08x -- %s\n",
152 hsr, esr_get_class_string(hsr));
153
154 kvm_inject_undefined(vcpu);
155 return 1;
156}
157
158static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run)
159{
160 /* Until SVE is supported for guests: */
161 kvm_inject_undefined(vcpu);
162 return 1;
163}
164
165#define __ptrauth_save_key(regs, key) \
166({ \
167 regs[key ## KEYLO_EL1] = read_sysreg_s(SYS_ ## key ## KEYLO_EL1); \
168 regs[key ## KEYHI_EL1] = read_sysreg_s(SYS_ ## key ## KEYHI_EL1); \
169})
170
171/*
172 * Handle the guest trying to use a ptrauth instruction, or trying to access a
173 * ptrauth register.
174 */
175void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu)
176{
177 struct kvm_cpu_context *ctxt;
178
179 if (vcpu_has_ptrauth(vcpu)) {
180 vcpu_ptrauth_enable(vcpu);
181 ctxt = vcpu->arch.host_cpu_context;
182 __ptrauth_save_key(ctxt->sys_regs, APIA);
183 __ptrauth_save_key(ctxt->sys_regs, APIB);
184 __ptrauth_save_key(ctxt->sys_regs, APDA);
185 __ptrauth_save_key(ctxt->sys_regs, APDB);
186 __ptrauth_save_key(ctxt->sys_regs, APGA);
187 } else {
188 kvm_inject_undefined(vcpu);
189 }
190}
191
192/*
193 * Guest usage of a ptrauth instruction (which the guest EL1 did not turn into
194 * a NOP).
195 */
196static int kvm_handle_ptrauth(struct kvm_vcpu *vcpu, struct kvm_run *run)
197{
198 kvm_arm_vcpu_ptrauth_trap(vcpu);
199 return 1;
200}
201
202static exit_handle_fn arm_exit_handlers[] = {
203 [0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec,
204 [ESR_ELx_EC_WFx] = kvm_handle_wfx,
205 [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32,
206 [ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64,
207 [ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32,
208 [ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store,
209 [ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64,
210 [ESR_ELx_EC_HVC32] = handle_hvc,
211 [ESR_ELx_EC_SMC32] = handle_smc,
212 [ESR_ELx_EC_HVC64] = handle_hvc,
213 [ESR_ELx_EC_SMC64] = handle_smc,
214 [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
215 [ESR_ELx_EC_SVE] = handle_sve,
216 [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
217 [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
218 [ESR_ELx_EC_SOFTSTP_LOW]= kvm_handle_guest_debug,
219 [ESR_ELx_EC_WATCHPT_LOW]= kvm_handle_guest_debug,
220 [ESR_ELx_EC_BREAKPT_LOW]= kvm_handle_guest_debug,
221 [ESR_ELx_EC_BKPT32] = kvm_handle_guest_debug,
222 [ESR_ELx_EC_BRK64] = kvm_handle_guest_debug,
223 [ESR_ELx_EC_FP_ASIMD] = handle_no_fpsimd,
224 [ESR_ELx_EC_PAC] = kvm_handle_ptrauth,
225};
226
227static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
228{
229 u32 hsr = kvm_vcpu_get_hsr(vcpu);
230 u8 hsr_ec = ESR_ELx_EC(hsr);
231
232 return arm_exit_handlers[hsr_ec];
233}
234
235/*
236 * We may be single-stepping an emulated instruction. If the emulation
237 * has been completed in the kernel, we can return to userspace with a
238 * KVM_EXIT_DEBUG, otherwise userspace needs to complete its
239 * emulation first.
240 */
241static int handle_trap_exceptions(struct kvm_vcpu *vcpu, struct kvm_run *run)
242{
243 int handled;
244
245 /*
246 * See ARM ARM B1.14.1: "Hyp traps on instructions
247 * that fail their condition code check"
248 */
249 if (!kvm_condition_valid(vcpu)) {
250 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
251 handled = 1;
252 } else {
253 exit_handle_fn exit_handler;
254
255 exit_handler = kvm_get_exit_handler(vcpu);
256 handled = exit_handler(vcpu, run);
257 }
258
259 return handled;
260}
261
262/*
263 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
264 * proper exit to userspace.
265 */
266int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
267 int exception_index)
268{
269 if (ARM_SERROR_PENDING(exception_index)) {
270 u8 hsr_ec = ESR_ELx_EC(kvm_vcpu_get_hsr(vcpu));
271
272 /*
273 * HVC/SMC already have an adjusted PC, which we need
274 * to correct in order to return to after having
275 * injected the SError.
276 */
277 if (hsr_ec == ESR_ELx_EC_HVC32 || hsr_ec == ESR_ELx_EC_HVC64 ||
278 hsr_ec == ESR_ELx_EC_SMC32 || hsr_ec == ESR_ELx_EC_SMC64) {
279 u32 adj = kvm_vcpu_trap_il_is32bit(vcpu) ? 4 : 2;
280 *vcpu_pc(vcpu) -= adj;
281 }
282
283 return 1;
284 }
285
286 exception_index = ARM_EXCEPTION_CODE(exception_index);
287
288 switch (exception_index) {
289 case ARM_EXCEPTION_IRQ:
290 return 1;
291 case ARM_EXCEPTION_EL1_SERROR:
292 return 1;
293 case ARM_EXCEPTION_TRAP:
294 return handle_trap_exceptions(vcpu, run);
295 case ARM_EXCEPTION_HYP_GONE:
296 /*
297 * EL2 has been reset to the hyp-stub. This happens when a guest
298 * is pre-empted by kvm_reboot()'s shutdown call.
299 */
300 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
301 return 0;
302 case ARM_EXCEPTION_IL:
303 /*
304 * We attempted an illegal exception return. Guest state must
305 * have been corrupted somehow. Give up.
306 */
307 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
308 return -EINVAL;
309 default:
310 kvm_pr_unimpl("Unsupported exception type: %d",
311 exception_index);
312 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
313 return 0;
314 }
315}
316
317/* For exit types that need handling before we can be preempted */
318void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
319 int exception_index)
320{
321 if (ARM_SERROR_PENDING(exception_index)) {
322 if (this_cpu_has_cap(ARM64_HAS_RAS_EXTN)) {
323 u64 disr = kvm_vcpu_get_disr(vcpu);
324
325 kvm_handle_guest_serror(vcpu, disr_to_esr(disr));
326 } else {
327 kvm_inject_vabt(vcpu);
328 }
329
330 return;
331 }
332
333 exception_index = ARM_EXCEPTION_CODE(exception_index);
334
335 if (exception_index == ARM_EXCEPTION_EL1_SERROR)
336 kvm_handle_guest_serror(vcpu, kvm_vcpu_get_hsr(vcpu));
337}