arch/arm64/kvm/sys_regs_generic_v8.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012,2013 - ARM Ltd
   4  * Author: Marc Zyngier <marc.zyngier@arm.com>
   5  *
   6  * Based on arch/arm/kvm/coproc_a15.c:
   7  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   8  * Authors: Rusty Russell <rusty@rustcorp.au>
   9  *          Christoffer Dall <c.dall@virtualopensystems.com>
  10  */
  11 #include <linux/kvm_host.h>
  12 #include <asm/cputype.h>
  13 #include <asm/kvm_arm.h>
  14 #include <asm/kvm_asm.h>
  15 #include <asm/kvm_host.h>
  16 #include <asm/kvm_emulate.h>
  17 #include <asm/kvm_coproc.h>
  18 #include <asm/sysreg.h>
  19 #include <linux/init.h>
  20
  21 #include "sys_regs.h"
  22
  23 static bool access_actlr(struct kvm_vcpu *vcpu,
  24                          struct sys_reg_params *p,
  25                          const struct sys_reg_desc *r)
  26 {
  27         if (p->is_write)
  28                 return ignore_write(vcpu, p);
  29
  30         p->regval = vcpu_read_sys_reg(vcpu, ACTLR_EL1);
  31         return true;
  32 }
  33
  34 static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
  35 {
  36         __vcpu_sys_reg(vcpu, ACTLR_EL1) = read_sysreg(actlr_el1);
  37 }
  38
  39 /*
  40  * Implementation specific sys-reg registers.
  41  * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2
  42  */
  43 static const struct sys_reg_desc genericv8_sys_regs[] = {
  44         { SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 },
  45 };
  46
  47 static const struct sys_reg_desc genericv8_cp15_regs[] = {
  48         /* ACTLR */
  49         { Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),
  50           access_actlr },
  51 };
  52
  53 static struct kvm_sys_reg_target_table genericv8_target_table = {
  54         .table64 = {
  55                 .table = genericv8_sys_regs,
  56                 .num = ARRAY_SIZE(genericv8_sys_regs),
  57         },
  58         .table32 = {
  59                 .table = genericv8_cp15_regs,
  60                 .num = ARRAY_SIZE(genericv8_cp15_regs),
  61         },
  62 };
  63
  64 static int __init sys_reg_genericv8_init(void)
  65 {
  66         unsigned int i;
  67
  68         for (i = 1; i < ARRAY_SIZE(genericv8_sys_regs); i++)
  69                 BUG_ON(cmp_sys_reg(&genericv8_sys_regs[i-1],
  70                                &genericv8_sys_regs[i]) >= 0);
  71
  72         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_AEM_V8,
  73                                           &genericv8_target_table);
  74         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_FOUNDATION_V8,
  75                                           &genericv8_target_table);
  76         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A53,
  77                                           &genericv8_target_table);
  78         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57,
  79                                           &genericv8_target_table);
  80         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_XGENE_POTENZA,
  81                                           &genericv8_target_table);
  82         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_GENERIC_V8,
  83                                           &genericv8_target_table);
  84
  85         return 0;
  86 }
  87 late_initcall(sys_reg_genericv8_init);