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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | /* * Copyright (C) 2012,2013 - ARM Ltd * Author: Marc Zyngier <marc.zyngier@arm.com> * * Derived from arch/arm/kvm/handle_exit.c: * Copyright (C) 2012 - Virtual Open Systems and Columbia University * Author: Christoffer Dall <c.dall@virtualopensystems.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include <linux/kvm.h> #include <linux/kvm_host.h> #include <asm/kvm_emulate.h> #include <asm/kvm_coproc.h> #include <asm/kvm_mmu.h> #include <asm/kvm_psci.h> typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) { if (kvm_psci_call(vcpu)) return 1; kvm_inject_undefined(vcpu); return 1; } static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run) { kvm_inject_undefined(vcpu); return 1; } /** * kvm_handle_wfx - handle a wait-for-interrupts or wait-for-event * instruction executed by a guest * * @vcpu: the vcpu pointer * * WFE: Yield the CPU and come back to this vcpu when the scheduler * decides to. * WFI: Simply call kvm_vcpu_block(), which will halt execution of * world-switches and schedule other host processes until there is an * incoming IRQ or FIQ to the VM. */ static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run) { if (kvm_vcpu_get_hsr(vcpu) & ESR_EL2_EC_WFI_ISS_WFE) kvm_vcpu_on_spin(vcpu); else kvm_vcpu_block(vcpu); return 1; } static exit_handle_fn arm_exit_handlers[] = { [ESR_EL2_EC_WFI] = kvm_handle_wfx, [ESR_EL2_EC_CP15_32] = kvm_handle_cp15_32, [ESR_EL2_EC_CP15_64] = kvm_handle_cp15_64, [ESR_EL2_EC_CP14_MR] = kvm_handle_cp14_access, [ESR_EL2_EC_CP14_LS] = kvm_handle_cp14_load_store, [ESR_EL2_EC_CP14_64] = kvm_handle_cp14_access, [ESR_EL2_EC_HVC32] = handle_hvc, [ESR_EL2_EC_SMC32] = handle_smc, [ESR_EL2_EC_HVC64] = handle_hvc, [ESR_EL2_EC_SMC64] = handle_smc, [ESR_EL2_EC_SYS64] = kvm_handle_sys_reg, [ESR_EL2_EC_IABT] = kvm_handle_guest_abort, [ESR_EL2_EC_DABT] = kvm_handle_guest_abort, }; static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) { u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu); if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || !arm_exit_handlers[hsr_ec]) { kvm_err("Unknown exception class: hsr: %#08x\n", (unsigned int)kvm_vcpu_get_hsr(vcpu)); BUG(); } return arm_exit_handlers[hsr_ec]; } /* * Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on * proper exit to userspace. */ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run, int exception_index) { exit_handle_fn exit_handler; switch (exception_index) { case ARM_EXCEPTION_IRQ: return 1; case ARM_EXCEPTION_TRAP: /* * See ARM ARM B1.14.1: "Hyp traps on instructions * that fail their condition code check" */ if (!kvm_condition_valid(vcpu)) { kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); return 1; } exit_handler = kvm_get_exit_handler(vcpu); return exit_handler(vcpu, run); default: kvm_pr_unimpl("Unsupported exception type: %d", exception_index); run->exit_reason = KVM_EXIT_INTERNAL_ERROR; return 0; } } |