2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
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.
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.
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.
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>
25 #include <trace/events/kvm.h>
29 typedef int (*exit_handle_fn
)(struct kvm_vcpu
*, struct kvm_run
*);
31 static int handle_svc_hyp(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
33 /* SVC called from Hyp mode should never get here */
34 kvm_debug("SVC called from Hyp mode shouldn't go here\n");
36 return -EINVAL
; /* Squash warning */
39 static int handle_hvc(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
43 trace_kvm_hvc(*vcpu_pc(vcpu
), *vcpu_reg(vcpu
, 0),
44 kvm_vcpu_hvc_get_imm(vcpu
));
45 vcpu
->stat
.hvc_exit_stat
++;
47 ret
= kvm_psci_call(vcpu
);
49 kvm_inject_undefined(vcpu
);
56 static int handle_smc(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
58 kvm_inject_undefined(vcpu
);
62 static int handle_pabt_hyp(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
64 /* The hypervisor should never cause aborts */
65 kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
66 kvm_vcpu_get_hfar(vcpu
), kvm_vcpu_get_hsr(vcpu
));
70 static int handle_dabt_hyp(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
72 /* This is either an error in the ws. code or an external abort */
73 kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
74 kvm_vcpu_get_hfar(vcpu
), kvm_vcpu_get_hsr(vcpu
));
79 * kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
80 * @vcpu: the vcpu pointer
81 * @run: the kvm_run structure pointer
83 * WFE: Yield the CPU and come back to this vcpu when the scheduler
85 * WFI: Simply call kvm_vcpu_block(), which will halt execution of
86 * world-switches and schedule other host processes until there is an
87 * incoming IRQ or FIQ to the VM.
89 static int kvm_handle_wfx(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
)
91 if (kvm_vcpu_get_hsr(vcpu
) & HSR_WFI_IS_WFE
) {
92 trace_kvm_wfx(*vcpu_pc(vcpu
), true);
93 vcpu
->stat
.wfe_exit_stat
++;
94 kvm_vcpu_on_spin(vcpu
);
96 trace_kvm_wfx(*vcpu_pc(vcpu
), false);
97 vcpu
->stat
.wfi_exit_stat
++;
101 kvm_skip_instr(vcpu
, kvm_vcpu_trap_il_is32bit(vcpu
));
106 static exit_handle_fn arm_exit_handlers
[] = {
107 [HSR_EC_WFI
] = kvm_handle_wfx
,
108 [HSR_EC_CP15_32
] = kvm_handle_cp15_32
,
109 [HSR_EC_CP15_64
] = kvm_handle_cp15_64
,
110 [HSR_EC_CP14_MR
] = kvm_handle_cp14_access
,
111 [HSR_EC_CP14_LS
] = kvm_handle_cp14_load_store
,
112 [HSR_EC_CP14_64
] = kvm_handle_cp14_access
,
113 [HSR_EC_CP_0_13
] = kvm_handle_cp_0_13_access
,
114 [HSR_EC_CP10_ID
] = kvm_handle_cp10_id
,
115 [HSR_EC_SVC_HYP
] = handle_svc_hyp
,
116 [HSR_EC_HVC
] = handle_hvc
,
117 [HSR_EC_SMC
] = handle_smc
,
118 [HSR_EC_IABT
] = kvm_handle_guest_abort
,
119 [HSR_EC_IABT_HYP
] = handle_pabt_hyp
,
120 [HSR_EC_DABT
] = kvm_handle_guest_abort
,
121 [HSR_EC_DABT_HYP
] = handle_dabt_hyp
,
124 static exit_handle_fn
kvm_get_exit_handler(struct kvm_vcpu
*vcpu
)
126 u8 hsr_ec
= kvm_vcpu_trap_get_class(vcpu
);
128 if (hsr_ec
>= ARRAY_SIZE(arm_exit_handlers
) ||
129 !arm_exit_handlers
[hsr_ec
]) {
130 kvm_err("Unknown exception class: hsr: %#08x\n",
131 (unsigned int)kvm_vcpu_get_hsr(vcpu
));
135 return arm_exit_handlers
[hsr_ec
];
139 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
140 * proper exit to userspace.
142 int handle_exit(struct kvm_vcpu
*vcpu
, struct kvm_run
*run
,
145 exit_handle_fn exit_handler
;
147 switch (exception_index
) {
148 case ARM_EXCEPTION_IRQ
:
150 case ARM_EXCEPTION_HVC
:
152 * See ARM ARM B1.14.1: "Hyp traps on instructions
153 * that fail their condition code check"
155 if (!kvm_condition_valid(vcpu
)) {
156 kvm_skip_instr(vcpu
, kvm_vcpu_trap_il_is32bit(vcpu
));
160 exit_handler
= kvm_get_exit_handler(vcpu
);
162 return exit_handler(vcpu
, run
);
164 kvm_pr_unimpl("Unsupported exception type: %d",
166 run
->exit_reason
= KVM_EXIT_INTERNAL_ERROR
;