blob: 4766b7f3515e28f90195c657f1b1ec19825f6d2b [file] [log] [blame]
Marc Zyngierc4b1afd2012-12-10 16:40:41 +00001/*
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#include <asm/kvm_emulate.h>
25#include <asm/kvm_coproc.h>
26#include <asm/kvm_mmu.h>
Marc Zyngierdcd2e402012-12-12 18:52:05 +000027#include <asm/kvm_psci.h>
Marc Zyngierc4b1afd2012-12-10 16:40:41 +000028
29typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
30
31static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
32{
Marc Zyngierdcd2e402012-12-12 18:52:05 +000033 if (kvm_psci_call(vcpu))
34 return 1;
35
Marc Zyngierc4b1afd2012-12-10 16:40:41 +000036 kvm_inject_undefined(vcpu);
37 return 1;
38}
39
40static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
41{
Marc Zyngierdcd2e402012-12-12 18:52:05 +000042 if (kvm_psci_call(vcpu))
43 return 1;
44
Marc Zyngierc4b1afd2012-12-10 16:40:41 +000045 kvm_inject_undefined(vcpu);
46 return 1;
47}
48
49/**
50 * kvm_handle_wfi - handle a wait-for-interrupts instruction executed by a guest
51 * @vcpu: the vcpu pointer
52 *
53 * Simply call kvm_vcpu_block(), which will halt execution of
54 * world-switches and schedule other host processes until there is an
55 * incoming IRQ or FIQ to the VM.
56 */
57static int kvm_handle_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
58{
59 kvm_vcpu_block(vcpu);
60 return 1;
61}
62
63static exit_handle_fn arm_exit_handlers[] = {
64 [ESR_EL2_EC_WFI] = kvm_handle_wfi,
65 [ESR_EL2_EC_HVC64] = handle_hvc,
66 [ESR_EL2_EC_SMC64] = handle_smc,
67 [ESR_EL2_EC_SYS64] = kvm_handle_sys_reg,
68 [ESR_EL2_EC_IABT] = kvm_handle_guest_abort,
69 [ESR_EL2_EC_DABT] = kvm_handle_guest_abort,
70};
71
72static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
73{
74 u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
75
76 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
77 !arm_exit_handlers[hsr_ec]) {
78 kvm_err("Unkown exception class: hsr: %#08x\n",
79 (unsigned int)kvm_vcpu_get_hsr(vcpu));
80 BUG();
81 }
82
83 return arm_exit_handlers[hsr_ec];
84}
85
86/*
87 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
88 * proper exit to userspace.
89 */
90int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
91 int exception_index)
92{
93 exit_handle_fn exit_handler;
94
95 switch (exception_index) {
96 case ARM_EXCEPTION_IRQ:
97 return 1;
98 case ARM_EXCEPTION_TRAP:
99 /*
100 * See ARM ARM B1.14.1: "Hyp traps on instructions
101 * that fail their condition code check"
102 */
103 if (!kvm_condition_valid(vcpu)) {
104 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
105 return 1;
106 }
107
108 exit_handler = kvm_get_exit_handler(vcpu);
109
110 return exit_handler(vcpu, run);
111 default:
112 kvm_pr_unimpl("Unsupported exception type: %d",
113 exception_index);
114 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
115 return 0;
116 }
117}