172 lines
4.8 KiB
C
172 lines
4.8 KiB
C
/*
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* Copyright (C) 2012 - Virtual Open Systems and Columbia University
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* Author: Christoffer Dall <c.dall@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_emulate.h>
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#include <asm/kvm_coproc.h>
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#include <asm/kvm_mmu.h>
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#include <asm/kvm_psci.h>
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#include <trace/events/kvm.h>
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#include "trace.h"
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typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
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static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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/* SVC called from Hyp mode should never get here */
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kvm_debug("SVC called from Hyp mode shouldn't go here\n");
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BUG();
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return -EINVAL; /* Squash warning */
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}
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static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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int ret;
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trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
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kvm_vcpu_hvc_get_imm(vcpu));
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ret = kvm_psci_call(vcpu);
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if (ret < 0) {
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kvm_inject_undefined(vcpu);
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return 1;
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}
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return ret;
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}
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static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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kvm_inject_undefined(vcpu);
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return 1;
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}
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static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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/* The hypervisor should never cause aborts */
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kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
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kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
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return -EFAULT;
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}
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static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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/* This is either an error in the ws. code or an external abort */
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kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
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kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
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return -EFAULT;
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}
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/**
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* kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
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* @vcpu: the vcpu pointer
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* @run: the kvm_run structure pointer
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*
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* WFE: Yield the CPU and come back to this vcpu when the scheduler
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* decides to.
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* WFI: Simply call kvm_vcpu_block(), which will halt execution of
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* world-switches and schedule other host processes until there is an
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* incoming IRQ or FIQ to the VM.
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*/
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static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
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{
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trace_kvm_wfi(*vcpu_pc(vcpu));
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if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
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kvm_vcpu_on_spin(vcpu);
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else
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kvm_vcpu_block(vcpu);
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kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
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return 1;
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}
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static exit_handle_fn arm_exit_handlers[] = {
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[HSR_EC_WFI] = kvm_handle_wfx,
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[HSR_EC_CP15_32] = kvm_handle_cp15_32,
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[HSR_EC_CP15_64] = kvm_handle_cp15_64,
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[HSR_EC_CP14_MR] = kvm_handle_cp14_access,
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[HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
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[HSR_EC_CP14_64] = kvm_handle_cp14_access,
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[HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
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[HSR_EC_CP10_ID] = kvm_handle_cp10_id,
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[HSR_EC_SVC_HYP] = handle_svc_hyp,
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[HSR_EC_HVC] = handle_hvc,
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[HSR_EC_SMC] = handle_smc,
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[HSR_EC_IABT] = kvm_handle_guest_abort,
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[HSR_EC_IABT_HYP] = handle_pabt_hyp,
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[HSR_EC_DABT] = kvm_handle_guest_abort,
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[HSR_EC_DABT_HYP] = handle_dabt_hyp,
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};
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static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
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{
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u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
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if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
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!arm_exit_handlers[hsr_ec]) {
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kvm_err("Unknown exception class: hsr: %#08x\n",
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(unsigned int)kvm_vcpu_get_hsr(vcpu));
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BUG();
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}
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return arm_exit_handlers[hsr_ec];
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}
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/*
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* Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
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* proper exit to userspace.
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*/
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int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
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int exception_index)
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{
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exit_handle_fn exit_handler;
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switch (exception_index) {
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case ARM_EXCEPTION_IRQ:
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return 1;
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case ARM_EXCEPTION_UNDEFINED:
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kvm_err("Undefined exception in Hyp mode at: %#08lx\n",
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kvm_vcpu_get_hyp_pc(vcpu));
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BUG();
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panic("KVM: Hypervisor undefined exception!\n");
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case ARM_EXCEPTION_DATA_ABORT:
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case ARM_EXCEPTION_PREF_ABORT:
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case ARM_EXCEPTION_HVC:
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/*
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* See ARM ARM B1.14.1: "Hyp traps on instructions
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* that fail their condition code check"
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*/
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if (!kvm_condition_valid(vcpu)) {
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kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
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return 1;
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}
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exit_handler = kvm_get_exit_handler(vcpu);
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return exit_handler(vcpu, run);
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default:
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kvm_pr_unimpl("Unsupported exception type: %d",
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exception_index);
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run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
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return 0;
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}
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}
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