From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/arm64/kvm/handle_exit.c | 147 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 arch/arm64/kvm/handle_exit.c (limited to 'arch/arm64/kvm/handle_exit.c') diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c new file mode 100644 index 000000000..524fa2567 --- /dev/null +++ b/arch/arm64/kvm/handle_exit.c @@ -0,0 +1,147 @@ +/* + * Copyright (C) 2012,2013 - ARM Ltd + * Author: Marc Zyngier + * + * Derived from arch/arm/kvm/handle_exit.c: + * Copyright (C) 2012 - Virtual Open Systems and Columbia University + * Author: Christoffer Dall + * + * 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 . + */ + +#include +#include + +#include +#include +#include +#include +#include + +#define CREATE_TRACE_POINTS +#include "trace.h" + +typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *); + +static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run) +{ + int ret; + + trace_kvm_hvc_arm64(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0), + kvm_vcpu_hvc_get_imm(vcpu)); + + ret = kvm_psci_call(vcpu); + if (ret < 0) { + kvm_inject_undefined(vcpu); + return 1; + } + + return ret; +} + +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_ELx_WFx_ISS_WFE) { + trace_kvm_wfx_arm64(*vcpu_pc(vcpu), true); + kvm_vcpu_on_spin(vcpu); + } else { + trace_kvm_wfx_arm64(*vcpu_pc(vcpu), false); + kvm_vcpu_block(vcpu); + } + + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + + return 1; +} + +static exit_handle_fn arm_exit_handlers[] = { + [ESR_ELx_EC_WFx] = kvm_handle_wfx, + [ESR_ELx_EC_CP15_32] = kvm_handle_cp15_32, + [ESR_ELx_EC_CP15_64] = kvm_handle_cp15_64, + [ESR_ELx_EC_CP14_MR] = kvm_handle_cp14_32, + [ESR_ELx_EC_CP14_LS] = kvm_handle_cp14_load_store, + [ESR_ELx_EC_CP14_64] = kvm_handle_cp14_64, + [ESR_ELx_EC_HVC32] = handle_hvc, + [ESR_ELx_EC_SMC32] = handle_smc, + [ESR_ELx_EC_HVC64] = handle_hvc, + [ESR_ELx_EC_SMC64] = handle_smc, + [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, + [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, + [ESR_ELx_EC_DABT_LOW] = kvm_handle_guest_abort, +}; + +static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu) +{ + u32 hsr = kvm_vcpu_get_hsr(vcpu); + u8 hsr_ec = hsr >> ESR_ELx_EC_SHIFT; + + if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) || + !arm_exit_handlers[hsr_ec]) { + kvm_err("Unknown exception class: hsr: %#08x -- %s\n", + hsr, esr_get_class_string(hsr)); + 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; + } +} -- cgit v1.2.3-54-g00ecf