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Marc Zyngieraa8eff92012-12-17 12:27:42 +00001/*
Marc Zyngiere82e0302013-02-06 11:29:35 +00002 * Fault injection for both 32 and 64bit guests.
Marc Zyngieraa8eff92012-12-17 12:27:42 +00003 *
4 * Copyright (C) 2012,2013 - ARM Ltd
5 * Author: Marc Zyngier <marc.zyngier@arm.com>
6 *
7 * Based on arch/arm/kvm/emulate.c
8 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
9 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
10 *
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24#include <linux/kvm_host.h>
25#include <asm/kvm_emulate.h>
26#include <asm/esr.h>
27
28#define PSTATE_FAULT_BITS_64 (PSR_MODE_EL1h | PSR_A_BIT | PSR_F_BIT | \
29 PSR_I_BIT | PSR_D_BIT)
30#define EL1_EXCEPT_SYNC_OFFSET 0x200
31
Marc Zyngiere82e0302013-02-06 11:29:35 +000032static void prepare_fault32(struct kvm_vcpu *vcpu, u32 mode, u32 vect_offset)
33{
34 unsigned long cpsr;
35 unsigned long new_spsr_value = *vcpu_cpsr(vcpu);
36 bool is_thumb = (new_spsr_value & COMPAT_PSR_T_BIT);
37 u32 return_offset = (is_thumb) ? 4 : 0;
38 u32 sctlr = vcpu_cp15(vcpu, c1_SCTLR);
39
40 cpsr = mode | COMPAT_PSR_I_BIT;
41
42 if (sctlr & (1 << 30))
43 cpsr |= COMPAT_PSR_T_BIT;
44 if (sctlr & (1 << 25))
45 cpsr |= COMPAT_PSR_E_BIT;
46
47 *vcpu_cpsr(vcpu) = cpsr;
48
49 /* Note: These now point to the banked copies */
50 *vcpu_spsr(vcpu) = new_spsr_value;
Marc Zyngierc0f09632015-11-16 10:28:17 +000051 *vcpu_reg32(vcpu, 14) = *vcpu_pc(vcpu) + return_offset;
Marc Zyngiere82e0302013-02-06 11:29:35 +000052
53 /* Branch to exception vector */
54 if (sctlr & (1 << 13))
55 vect_offset += 0xffff0000;
56 else /* always have security exceptions */
57 vect_offset += vcpu_cp15(vcpu, c12_VBAR);
58
59 *vcpu_pc(vcpu) = vect_offset;
60}
61
62static void inject_undef32(struct kvm_vcpu *vcpu)
63{
64 prepare_fault32(vcpu, COMPAT_PSR_MODE_UND, 4);
65}
66
67/*
68 * Modelled after TakeDataAbortException() and TakePrefetchAbortException
69 * pseudocode.
70 */
71static void inject_abt32(struct kvm_vcpu *vcpu, bool is_pabt,
72 unsigned long addr)
73{
74 u32 vect_offset;
75 u32 *far, *fsr;
76 bool is_lpae;
77
78 if (is_pabt) {
79 vect_offset = 12;
80 far = &vcpu_cp15(vcpu, c6_IFAR);
81 fsr = &vcpu_cp15(vcpu, c5_IFSR);
82 } else { /* !iabt */
83 vect_offset = 16;
84 far = &vcpu_cp15(vcpu, c6_DFAR);
85 fsr = &vcpu_cp15(vcpu, c5_DFSR);
86 }
87
88 prepare_fault32(vcpu, COMPAT_PSR_MODE_ABT | COMPAT_PSR_A_BIT, vect_offset);
89
90 *far = addr;
91
92 /* Give the guest an IMPLEMENTATION DEFINED exception */
93 is_lpae = (vcpu_cp15(vcpu, c2_TTBCR) >> 31);
94 if (is_lpae)
95 *fsr = 1 << 9 | 0x34;
96 else
97 *fsr = 0x14;
98}
99
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000100static void inject_abt64(struct kvm_vcpu *vcpu, bool is_iabt, unsigned long addr)
101{
102 unsigned long cpsr = *vcpu_cpsr(vcpu);
103 bool is_aarch32;
104 u32 esr = 0;
105
106 is_aarch32 = vcpu_mode_is_32bit(vcpu);
107
108 *vcpu_spsr(vcpu) = cpsr;
109 *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
110
111 *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
112 *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
113
114 vcpu_sys_reg(vcpu, FAR_EL1) = addr;
115
116 /*
117 * Build an {i,d}abort, depending on the level and the
118 * instruction set. Report an external synchronous abort.
119 */
120 if (kvm_vcpu_trap_il_is32bit(vcpu))
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000121 esr |= ESR_ELx_IL;
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000122
123 /*
124 * Here, the guest runs in AArch64 mode when in EL1. If we get
125 * an AArch32 fault, it means we managed to trap an EL0 fault.
126 */
127 if (is_aarch32 || (cpsr & PSR_MODE_MASK) == PSR_MODE_EL0t)
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000128 esr |= (ESR_ELx_EC_IABT_LOW << ESR_ELx_EC_SHIFT);
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000129 else
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000130 esr |= (ESR_ELx_EC_IABT_CUR << ESR_ELx_EC_SHIFT);
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000131
132 if (!is_iabt)
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000133 esr |= ESR_ELx_EC_DABT_LOW;
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000134
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000135 vcpu_sys_reg(vcpu, ESR_EL1) = esr | ESR_ELx_FSC_EXTABT;
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000136}
137
138static void inject_undef64(struct kvm_vcpu *vcpu)
139{
140 unsigned long cpsr = *vcpu_cpsr(vcpu);
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000141 u32 esr = (ESR_ELx_EC_UNKNOWN << ESR_ELx_EC_SHIFT);
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000142
143 *vcpu_spsr(vcpu) = cpsr;
144 *vcpu_elr_el1(vcpu) = *vcpu_pc(vcpu);
145
146 *vcpu_cpsr(vcpu) = PSTATE_FAULT_BITS_64;
147 *vcpu_pc(vcpu) = vcpu_sys_reg(vcpu, VBAR_EL1) + EL1_EXCEPT_SYNC_OFFSET;
148
149 /*
150 * Build an unknown exception, depending on the instruction
151 * set.
152 */
153 if (kvm_vcpu_trap_il_is32bit(vcpu))
Mark Rutlandc6d01a92014-11-24 13:59:30 +0000154 esr |= ESR_ELx_IL;
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000155
156 vcpu_sys_reg(vcpu, ESR_EL1) = esr;
157}
158
159/**
160 * kvm_inject_dabt - inject a data abort into the guest
161 * @vcpu: The VCPU to receive the undefined exception
162 * @addr: The address to report in the DFAR
163 *
164 * It is assumed that this code is called from the VCPU thread and that the
165 * VCPU therefore is not currently executing guest code.
166 */
167void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr)
168{
Marc Zyngiere82e0302013-02-06 11:29:35 +0000169 if (!(vcpu->arch.hcr_el2 & HCR_RW))
170 inject_abt32(vcpu, false, addr);
Marc Zyngier126c69a2015-08-27 16:10:01 +0100171 else
172 inject_abt64(vcpu, false, addr);
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000173}
174
175/**
176 * kvm_inject_pabt - inject a prefetch abort into the guest
177 * @vcpu: The VCPU to receive the undefined exception
178 * @addr: The address to report in the DFAR
179 *
180 * It is assumed that this code is called from the VCPU thread and that the
181 * VCPU therefore is not currently executing guest code.
182 */
183void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr)
184{
Marc Zyngiere82e0302013-02-06 11:29:35 +0000185 if (!(vcpu->arch.hcr_el2 & HCR_RW))
186 inject_abt32(vcpu, true, addr);
Marc Zyngier126c69a2015-08-27 16:10:01 +0100187 else
188 inject_abt64(vcpu, true, addr);
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000189}
190
191/**
192 * kvm_inject_undefined - inject an undefined instruction into the guest
193 *
194 * It is assumed that this code is called from the VCPU thread and that the
195 * VCPU therefore is not currently executing guest code.
196 */
197void kvm_inject_undefined(struct kvm_vcpu *vcpu)
198{
Marc Zyngiere82e0302013-02-06 11:29:35 +0000199 if (!(vcpu->arch.hcr_el2 & HCR_RW))
200 inject_undef32(vcpu);
Marc Zyngier126c69a2015-08-27 16:10:01 +0100201 else
202 inject_undef64(vcpu);
Marc Zyngieraa8eff92012-12-17 12:27:42 +0000203}