blob: 4c979d466cc1681c4b3efc70623345eee5974b78 [file] [log] [blame]
Marc Zyngier3414bbf2012-10-05 11:11:11 +01001/*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19#include <linux/kvm.h>
20#include <linux/kvm_host.h>
21#include <asm/kvm_emulate.h>
22#include <asm/kvm_coproc.h>
23#include <asm/kvm_mmu.h>
24#include <asm/kvm_psci.h>
Marc Zyngier61909202012-10-05 13:42:45 +010025#include <trace/events/kvm.h>
26
27#include "trace.h"
Marc Zyngier3414bbf2012-10-05 11:11:11 +010028
29typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
30
31static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
32{
33 /* SVC called from Hyp mode should never get here */
34 kvm_debug("SVC called from Hyp mode shouldn't go here\n");
35 BUG();
36 return -EINVAL; /* Squash warning */
37}
38
39static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
40{
Anup Patele8e7fcc2014-04-29 11:24:18 +053041 int ret;
42
Christoffer Dallc088f8f2013-02-21 11:26:10 -080043 trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
44 kvm_vcpu_hvc_get_imm(vcpu));
45
Anup Patele8e7fcc2014-04-29 11:24:18 +053046 ret = kvm_psci_call(vcpu);
47 if (ret < 0) {
48 kvm_inject_undefined(vcpu);
Marc Zyngier3414bbf2012-10-05 11:11:11 +010049 return 1;
Anup Patele8e7fcc2014-04-29 11:24:18 +053050 }
Marc Zyngier3414bbf2012-10-05 11:11:11 +010051
Anup Patele8e7fcc2014-04-29 11:24:18 +053052 return ret;
Marc Zyngier3414bbf2012-10-05 11:11:11 +010053}
54
55static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
56{
Marc Zyngier3414bbf2012-10-05 11:11:11 +010057 kvm_inject_undefined(vcpu);
58 return 1;
59}
60
61static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
62{
63 /* The hypervisor should never cause aborts */
64 kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
65 kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
66 return -EFAULT;
67}
68
69static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
70{
71 /* This is either an error in the ws. code or an external abort */
72 kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
73 kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
74 return -EFAULT;
75}
76
Marc Zyngier61909202012-10-05 13:42:45 +010077/**
Christoffer Dall86ed81a2013-10-15 18:10:42 -070078 * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
Marc Zyngier61909202012-10-05 13:42:45 +010079 * @vcpu: the vcpu pointer
80 * @run: the kvm_run structure pointer
81 *
Christoffer Dall86ed81a2013-10-15 18:10:42 -070082 * WFE: Yield the CPU and come back to this vcpu when the scheduler
83 * decides to.
84 * WFI: Simply call kvm_vcpu_block(), which will halt execution of
85 * world-switches and schedule other host processes until there is an
86 * incoming IRQ or FIQ to the VM.
Marc Zyngier61909202012-10-05 13:42:45 +010087 */
Christoffer Dall86ed81a2013-10-15 18:10:42 -070088static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
Marc Zyngier61909202012-10-05 13:42:45 +010089{
90 trace_kvm_wfi(*vcpu_pc(vcpu));
Marc Zyngier58d5ec82013-10-08 18:38:13 +010091 if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
92 kvm_vcpu_on_spin(vcpu);
93 else
94 kvm_vcpu_block(vcpu);
95
Marc Zyngier61909202012-10-05 13:42:45 +010096 return 1;
97}
98
Marc Zyngier3414bbf2012-10-05 11:11:11 +010099static exit_handle_fn arm_exit_handlers[] = {
Christoffer Dall86ed81a2013-10-15 18:10:42 -0700100 [HSR_EC_WFI] = kvm_handle_wfx,
Marc Zyngier3414bbf2012-10-05 11:11:11 +0100101 [HSR_EC_CP15_32] = kvm_handle_cp15_32,
102 [HSR_EC_CP15_64] = kvm_handle_cp15_64,
103 [HSR_EC_CP14_MR] = kvm_handle_cp14_access,
104 [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
105 [HSR_EC_CP14_64] = kvm_handle_cp14_access,
106 [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
107 [HSR_EC_CP10_ID] = kvm_handle_cp10_id,
108 [HSR_EC_SVC_HYP] = handle_svc_hyp,
109 [HSR_EC_HVC] = handle_hvc,
110 [HSR_EC_SMC] = handle_smc,
111 [HSR_EC_IABT] = kvm_handle_guest_abort,
112 [HSR_EC_IABT_HYP] = handle_pabt_hyp,
113 [HSR_EC_DABT] = kvm_handle_guest_abort,
114 [HSR_EC_DABT_HYP] = handle_dabt_hyp,
115};
116
117static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
118{
119 u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
120
121 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
122 !arm_exit_handlers[hsr_ec]) {
Linus Torvalds8546dc12013-05-03 09:13:19 -0700123 kvm_err("Unknown exception class: hsr: %#08x\n",
Marc Zyngier3414bbf2012-10-05 11:11:11 +0100124 (unsigned int)kvm_vcpu_get_hsr(vcpu));
125 BUG();
126 }
127
128 return arm_exit_handlers[hsr_ec];
129}
130
131/*
132 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
133 * proper exit to userspace.
134 */
135int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
136 int exception_index)
137{
138 exit_handle_fn exit_handler;
139
140 switch (exception_index) {
141 case ARM_EXCEPTION_IRQ:
142 return 1;
143 case ARM_EXCEPTION_UNDEFINED:
144 kvm_err("Undefined exception in Hyp mode at: %#08lx\n",
145 kvm_vcpu_get_hyp_pc(vcpu));
146 BUG();
147 panic("KVM: Hypervisor undefined exception!\n");
148 case ARM_EXCEPTION_DATA_ABORT:
149 case ARM_EXCEPTION_PREF_ABORT:
150 case ARM_EXCEPTION_HVC:
151 /*
152 * See ARM ARM B1.14.1: "Hyp traps on instructions
153 * that fail their condition code check"
154 */
155 if (!kvm_condition_valid(vcpu)) {
156 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
157 return 1;
158 }
159
160 exit_handler = kvm_get_exit_handler(vcpu);
161
162 return exit_handler(vcpu, run);
163 default:
164 kvm_pr_unimpl("Unsupported exception type: %d",
165 exception_index);
166 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
167 return 0;
168 }
169}