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>
26 #include <asm/kvm_coproc.h>
27 #include <asm/kvm_emulate.h>
28 #include <asm/kvm_mmu.h>
29 #include <asm/kvm_psci.h>
31 typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
33 static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
37 ret = kvm_psci_call(vcpu);
39 kvm_inject_undefined(vcpu);
46 static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
48 kvm_inject_undefined(vcpu);
53 * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event
54 * instruction executed by a guest
56 * @vcpu: the vcpu pointer
58 * WFE: Yield the CPU and come back to this vcpu when the scheduler
60 * WFI: Simply call kvm_vcpu_block(), which will halt execution of
61 * world-switches and schedule other host processes until there is an
62 * incoming IRQ or FIQ to the VM.
64 static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
66 if (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_WFx_ISS_WFE)
67 kvm_vcpu_on_spin(vcpu);
71 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
76 static exit_handle_fn arm_exit_handlers[] = {
77 [ESR_ELx_EC_WFx] = kvm_handle_wfx,
78 [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32,
79 [ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64,
80 [ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32,
81 [ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store,
82 [ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64,
83 [ESR_ELx_EC_HVC32] = handle_hvc,
84 [ESR_ELx_EC_SMC32] = handle_smc,
85 [ESR_ELx_EC_HVC64] = handle_hvc,
86 [ESR_ELx_EC_SMC64] = handle_smc,
87 [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
88 [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort,
89 [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort,
92 static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
94 u32 hsr = kvm_vcpu_get_hsr(vcpu);
95 u8 hsr_ec = hsr >> ESR_ELx_EC_SHIFT;
97 if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
98 !arm_exit_handlers[hsr_ec]) {
99 kvm_err("Unknown exception class: hsr: %#08x -- %s\n",
100 hsr, esr_get_class_string(hsr));
104 return arm_exit_handlers[hsr_ec];
108 * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
109 * proper exit to userspace.
111 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
114 exit_handle_fn exit_handler;
116 switch (exception_index) {
117 case ARM_EXCEPTION_IRQ:
119 case ARM_EXCEPTION_TRAP:
121 * See ARM ARM B1.14.1: "Hyp traps on instructions
122 * that fail their condition code check"
124 if (!kvm_condition_valid(vcpu)) {
125 kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
129 exit_handler = kvm_get_exit_handler(vcpu);
131 return exit_handler(vcpu, run);
133 kvm_pr_unimpl("Unsupported exception type: %d",
135 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;