Linux 3.17-rc2
[linux/fpc-iii.git] / arch / arm64 / kvm / handle_exit.c
blobe28be510380ca758f8cdb76a5da57892cb02e3bf
1 /*
2 * Copyright (C) 2012,2013 - ARM Ltd
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
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>
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.
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.
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/>.
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>
27 #include <asm/kvm_psci.h>
29 typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
31 static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
33 int ret;
35 ret = kvm_psci_call(vcpu);
36 if (ret < 0) {
37 kvm_inject_undefined(vcpu);
38 return 1;
41 return ret;
44 static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
46 kvm_inject_undefined(vcpu);
47 return 1;
50 /**
51 * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
52 * instruction executed by a guest
54 * @vcpu: the vcpu pointer
56 * WFE: Yield the CPU and come back to this vcpu when the scheduler
57 * decides to.
58 * WFI: Simply call kvm_vcpu_block(), which will halt execution of
59 * world-switches and schedule other host processes until there is an
60 * incoming IRQ or FIQ to the VM.
62 static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
64 if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE)
65 kvm_vcpu_on_spin(vcpu);
66 else
67 kvm_vcpu_block(vcpu);
69 return 1;
72 static exit_handle_fn arm_exit_handlers[] = {
73 [ESR_EL2_EC_WFI] = kvm_handle_wfx,
74 [ESR_EL2_EC_CP15_32] = kvm_handle_cp15_32,
75 [ESR_EL2_EC_CP15_64] = kvm_handle_cp15_64,
76 [ESR_EL2_EC_CP14_MR] = kvm_handle_cp14_32,
77 [ESR_EL2_EC_CP14_LS] = kvm_handle_cp14_load_store,
78 [ESR_EL2_EC_CP14_64] = kvm_handle_cp14_64,
79 [ESR_EL2_EC_HVC32] = handle_hvc,
80 [ESR_EL2_EC_SMC32] = handle_smc,
81 [ESR_EL2_EC_HVC64] = handle_hvc,
82 [ESR_EL2_EC_SMC64] = handle_smc,
83 [ESR_EL2_EC_SYS64] = kvm_handle_sys_reg,
84 [ESR_EL2_EC_IABT] = kvm_handle_guest_abort,
85 [ESR_EL2_EC_DABT] = kvm_handle_guest_abort,
88 static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
90 u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
92 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
93 !arm_exit_handlers[hsr_ec]) {
94 kvm_err("Unknown exception class: hsr: %#08x\n",
95 (unsigned int)kvm_vcpu_get_hsr(vcpu));
96 BUG();
99 return arm_exit_handlers[hsr_ec];
103 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
104 * proper exit to userspace.
106 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
107 int exception_index)
109 exit_handle_fn exit_handler;
111 switch (exception_index) {
112 case ARM_EXCEPTION_IRQ:
113 return 1;
114 case ARM_EXCEPTION_TRAP:
116 * See ARM ARM B1.14.1: "Hyp traps on instructions
117 * that fail their condition code check"
119 if (!kvm_condition_valid(vcpu)) {
120 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
121 return 1;
124 exit_handler = kvm_get_exit_handler(vcpu);
126 return exit_handler(vcpu, run);
127 default:
128 kvm_pr_unimpl("Unsupported exception type: %d",
129 exception_index);
130 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
131 return 0;