linux/arch/arm64/kvm/sys_regs_generic_v8.c
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   1/*
   2 * Copyright (C) 2012,2013 - ARM Ltd
   3 * Author: Marc Zyngier <marc.zyngier@arm.com>
   4 *
   5 * Based on arch/arm/kvm/coproc_a15.c:
   6 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   7 * Authors: Rusty Russell <rusty@rustcorp.au>
   8 *          Christoffer Dall <c.dall@virtualopensystems.com>
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License, version 2, as
  12 * published by the Free Software Foundation.
  13 *
  14 * This program is distributed in the hope that it will be useful,
  15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 * GNU General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22#include <linux/kvm_host.h>
  23#include <asm/cputype.h>
  24#include <asm/kvm_arm.h>
  25#include <asm/kvm_asm.h>
  26#include <asm/kvm_host.h>
  27#include <asm/kvm_emulate.h>
  28#include <asm/kvm_coproc.h>
  29#include <linux/init.h>
  30
  31#include "sys_regs.h"
  32
  33static bool access_actlr(struct kvm_vcpu *vcpu,
  34                         const struct sys_reg_params *p,
  35                         const struct sys_reg_desc *r)
  36{
  37        if (p->is_write)
  38                return ignore_write(vcpu, p);
  39
  40        *vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, ACTLR_EL1);
  41        return true;
  42}
  43
  44static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
  45{
  46        u64 actlr;
  47
  48        asm volatile("mrs %0, actlr_el1\n" : "=r" (actlr));
  49        vcpu_sys_reg(vcpu, ACTLR_EL1) = actlr;
  50}
  51
  52/*
  53 * Implementation specific sys-reg registers.
  54 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
  55 */
  56static const struct sys_reg_desc genericv8_sys_regs[] = {
  57        /* ACTLR_EL1 */
  58        { Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),
  59          access_actlr, reset_actlr, ACTLR_EL1 },
  60};
  61
  62static const struct sys_reg_desc genericv8_cp15_regs[] = {
  63        /* ACTLR */
  64        { Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),
  65          access_actlr },
  66};
  67
  68static struct kvm_sys_reg_target_table genericv8_target_table = {
  69        .table64 = {
  70                .table = genericv8_sys_regs,
  71                .num = ARRAY_SIZE(genericv8_sys_regs),
  72        },
  73        .table32 = {
  74                .table = genericv8_cp15_regs,
  75                .num = ARRAY_SIZE(genericv8_cp15_regs),
  76        },
  77};
  78
  79static int __init sys_reg_genericv8_init(void)
  80{
  81        unsigned int i;
  82
  83        for (i = 1; i < ARRAY_SIZE(genericv8_sys_regs); i++)
  84                BUG_ON(cmp_sys_reg(&genericv8_sys_regs[i-1],
  85                               &genericv8_sys_regs[i]) >= 0);
  86
  87        kvm_register_target_sys_reg_table(KVM_ARM_TARGET_AEM_V8,
  88                                          &genericv8_target_table);
  89        kvm_register_target_sys_reg_table(KVM_ARM_TARGET_FOUNDATION_V8,
  90                                          &genericv8_target_table);
  91        kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57,
  92                                          &genericv8_target_table);
  93        return 0;
  94}
  95late_initcall(sys_reg_genericv8_init);
  96