arch/arm64/kvm/sys_regs_generic_v8.c

   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
  33 static 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
  44 static 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  */
  56 static 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
  62 static const struct sys_reg_desc genericv8_cp15_regs[] = {
  63         /* ACTLR */
  64         { Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),
  65           access_actlr },
  66 };
  67
  68 static 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
  79 static 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 }
  95 late_initcall(sys_reg_genericv8_init);