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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 
 33 static bool access_actlr(struct kvm_vcpu *vcpu,
 34                          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         p->regval = 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_A53,
 92                                           &genericv8_target_table);
 93         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57,
 94                                           &genericv8_target_table);
 95         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_XGENE_POTENZA,
 96                                           &genericv8_target_table);
 97         kvm_register_target_sys_reg_table(KVM_ARM_TARGET_GENERIC_V8,
 98                                           &genericv8_target_table);
 99 
100         return 0;
101 }
102 late_initcall(sys_reg_genericv8_init);
103 

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