Marc Zyngier | 3414bbf | 2012-10-05 11:11:11 +0100 | [diff] [blame^] | 1 | /* |
| 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> |
| 25 | |
| 26 | typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); |
| 27 | |
| 28 | static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) |
| 29 | { |
| 30 | /* SVC called from Hyp mode should never get here */ |
| 31 | kvm_debug("SVC called from Hyp mode shouldn't go here\n"); |
| 32 | BUG(); |
| 33 | return -EINVAL; /* Squash warning */ |
| 34 | } |
| 35 | |
| 36 | static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) |
| 37 | { |
| 38 | if (kvm_psci_call(vcpu)) |
| 39 | return 1; |
| 40 | |
| 41 | kvm_inject_undefined(vcpu); |
| 42 | return 1; |
| 43 | } |
| 44 | |
| 45 | static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) |
| 46 | { |
| 47 | if (kvm_psci_call(vcpu)) |
| 48 | return 1; |
| 49 | |
| 50 | kvm_inject_undefined(vcpu); |
| 51 | return 1; |
| 52 | } |
| 53 | |
| 54 | static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) |
| 55 | { |
| 56 | /* The hypervisor should never cause aborts */ |
| 57 | kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", |
| 58 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); |
| 59 | return -EFAULT; |
| 60 | } |
| 61 | |
| 62 | static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run) |
| 63 | { |
| 64 | /* This is either an error in the ws. code or an external abort */ |
| 65 | kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n", |
| 66 | kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu)); |
| 67 | return -EFAULT; |
| 68 | } |
| 69 | |
| 70 | static exit_handle_fn arm_exit_handlers[] = { |
| 71 | [HSR_EC_WFI] = kvm_handle_wfi, |
| 72 | [HSR_EC_CP15_32] = kvm_handle_cp15_32, |
| 73 | [HSR_EC_CP15_64] = kvm_handle_cp15_64, |
| 74 | [HSR_EC_CP14_MR] = kvm_handle_cp14_access, |
| 75 | [HSR_EC_CP14_LS] = kvm_handle_cp14_load_store, |
| 76 | [HSR_EC_CP14_64] = kvm_handle_cp14_access, |
| 77 | [HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access, |
| 78 | [HSR_EC_CP10_ID] = kvm_handle_cp10_id, |
| 79 | [HSR_EC_SVC_HYP] = handle_svc_hyp, |
| 80 | [HSR_EC_HVC] = handle_hvc, |
| 81 | [HSR_EC_SMC] = handle_smc, |
| 82 | [HSR_EC_IABT] = kvm_handle_guest_abort, |
| 83 | [HSR_EC_IABT_HYP] = handle_pabt_hyp, |
| 84 | [HSR_EC_DABT] = kvm_handle_guest_abort, |
| 85 | [HSR_EC_DABT_HYP] = handle_dabt_hyp, |
| 86 | }; |
| 87 | |
| 88 | static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) |
| 89 | { |
| 90 | u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); |
| 91 | |
| 92 | if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || |
| 93 | !arm_exit_handlers[hsr_ec]) { |
| 94 | kvm_err("Unkown exception class: hsr: %#08x\n", |
| 95 | (unsigned int)kvm_vcpu_get_hsr(vcpu)); |
| 96 | BUG(); |
| 97 | } |
| 98 | |
| 99 | return arm_exit_handlers[hsr_ec]; |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on |
| 104 | * proper exit to userspace. |
| 105 | */ |
| 106 | int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, |
| 107 | int exception_index) |
| 108 | { |
| 109 | exit_handle_fn exit_handler; |
| 110 | |
| 111 | switch (exception_index) { |
| 112 | case ARM_EXCEPTION_IRQ: |
| 113 | return 1; |
| 114 | case ARM_EXCEPTION_UNDEFINED: |
| 115 | kvm_err("Undefined exception in Hyp mode at: %#08lx\n", |
| 116 | kvm_vcpu_get_hyp_pc(vcpu)); |
| 117 | BUG(); |
| 118 | panic("KVM: Hypervisor undefined exception!\n"); |
| 119 | case ARM_EXCEPTION_DATA_ABORT: |
| 120 | case ARM_EXCEPTION_PREF_ABORT: |
| 121 | case ARM_EXCEPTION_HVC: |
| 122 | /* |
| 123 | * See ARM ARM B1.14.1: "Hyp traps on instructions |
| 124 | * that fail their condition code check" |
| 125 | */ |
| 126 | if (!kvm_condition_valid(vcpu)) { |
| 127 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); |
| 128 | return 1; |
| 129 | } |
| 130 | |
| 131 | exit_handler = kvm_get_exit_handler(vcpu); |
| 132 | |
| 133 | return exit_handler(vcpu, run); |
| 134 | default: |
| 135 | kvm_pr_unimpl("Unsupported exception type: %d", |
| 136 | exception_index); |
| 137 | run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
| 138 | return 0; |
| 139 | } |
| 140 | } |