167 lines
4.7 KiB
C
167 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#include <linux/mm.h>
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#include <linux/kvm_host.h>
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#include <asm/kvm_arm.h>
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#include <asm/kvm_emulate.h>
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#include <asm/opcodes.h>
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#include <trace/events/kvm.h>
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#include "trace.h"
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#define VCPU_NR_MODES 6
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#define VCPU_REG_OFFSET_USR 0
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#define VCPU_REG_OFFSET_FIQ 1
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#define VCPU_REG_OFFSET_IRQ 2
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#define VCPU_REG_OFFSET_SVC 3
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#define VCPU_REG_OFFSET_ABT 4
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#define VCPU_REG_OFFSET_UND 5
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#define REG_OFFSET(_reg) \
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(offsetof(struct kvm_regs, _reg) / sizeof(u32))
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#define USR_REG_OFFSET(_num) REG_OFFSET(usr_regs.uregs[_num])
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static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][15] = {
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/* USR/SYS Registers */
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[VCPU_REG_OFFSET_USR] = {
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USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
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USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
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USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
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USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
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USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
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},
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/* FIQ Registers */
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[VCPU_REG_OFFSET_FIQ] = {
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USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
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USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
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USR_REG_OFFSET(6), USR_REG_OFFSET(7),
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REG_OFFSET(fiq_regs[0]), /* r8 */
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REG_OFFSET(fiq_regs[1]), /* r9 */
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REG_OFFSET(fiq_regs[2]), /* r10 */
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REG_OFFSET(fiq_regs[3]), /* r11 */
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REG_OFFSET(fiq_regs[4]), /* r12 */
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REG_OFFSET(fiq_regs[5]), /* r13 */
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REG_OFFSET(fiq_regs[6]), /* r14 */
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},
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/* IRQ Registers */
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[VCPU_REG_OFFSET_IRQ] = {
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USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
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USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
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USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
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USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
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USR_REG_OFFSET(12),
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REG_OFFSET(irq_regs[0]), /* r13 */
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REG_OFFSET(irq_regs[1]), /* r14 */
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},
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/* SVC Registers */
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[VCPU_REG_OFFSET_SVC] = {
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USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
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USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
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USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
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USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
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USR_REG_OFFSET(12),
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REG_OFFSET(svc_regs[0]), /* r13 */
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REG_OFFSET(svc_regs[1]), /* r14 */
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},
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/* ABT Registers */
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[VCPU_REG_OFFSET_ABT] = {
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USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
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USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
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USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
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USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
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USR_REG_OFFSET(12),
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REG_OFFSET(abt_regs[0]), /* r13 */
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REG_OFFSET(abt_regs[1]), /* r14 */
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},
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/* UND Registers */
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[VCPU_REG_OFFSET_UND] = {
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USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
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USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
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USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
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USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
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USR_REG_OFFSET(12),
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REG_OFFSET(und_regs[0]), /* r13 */
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REG_OFFSET(und_regs[1]), /* r14 */
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},
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};
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/*
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* Return a pointer to the register number valid in the current mode of
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* the virtual CPU.
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*/
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unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num)
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{
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unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs;
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unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
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switch (mode) {
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case USR_MODE...SVC_MODE:
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mode &= ~MODE32_BIT; /* 0 ... 3 */
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break;
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case ABT_MODE:
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mode = VCPU_REG_OFFSET_ABT;
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break;
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case UND_MODE:
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mode = VCPU_REG_OFFSET_UND;
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break;
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case SYSTEM_MODE:
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mode = VCPU_REG_OFFSET_USR;
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break;
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default:
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BUG();
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}
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return reg_array + vcpu_reg_offsets[mode][reg_num];
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}
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/*
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* Return the SPSR for the current mode of the virtual CPU.
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*/
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unsigned long *__vcpu_spsr(struct kvm_vcpu *vcpu)
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{
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unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
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switch (mode) {
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case SVC_MODE:
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return &vcpu->arch.ctxt.gp_regs.KVM_ARM_SVC_spsr;
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case ABT_MODE:
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return &vcpu->arch.ctxt.gp_regs.KVM_ARM_ABT_spsr;
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case UND_MODE:
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return &vcpu->arch.ctxt.gp_regs.KVM_ARM_UND_spsr;
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case IRQ_MODE:
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return &vcpu->arch.ctxt.gp_regs.KVM_ARM_IRQ_spsr;
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case FIQ_MODE:
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return &vcpu->arch.ctxt.gp_regs.KVM_ARM_FIQ_spsr;
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default:
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BUG();
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}
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}
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/******************************************************************************
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* Inject exceptions into the guest
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*/
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/**
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* kvm_inject_vabt - inject an async abort / SError into the guest
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* @vcpu: The VCPU to receive the exception
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*
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* It is assumed that this code is called from the VCPU thread and that the
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* VCPU therefore is not currently executing guest code.
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*/
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void kvm_inject_vabt(struct kvm_vcpu *vcpu)
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{
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*vcpu_hcr(vcpu) |= HCR_VA;
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}
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