arm64: KVM: CPU specific system registers handling

/*

 * Copyright (C) 2012,2013 - ARM Ltd

 * Author: Marc Zyngier <marc.zyngier@arm.com>

 *

 * Based on arch/arm/kvm/coproc_a15.c:

 * Copyright (C) 2012 - Virtual Open Systems and Columbia University

 * Authors: Rusty Russell <rusty@rustcorp.au>

 *          Christoffer Dall <c.dall@virtualopensystems.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License, version 2, as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#include <linux/kvm_host.h>

#include <asm/cputype.h>

#include <asm/kvm_arm.h>

#include <asm/kvm_asm.h>

#include <asm/kvm_host.h>

#include <asm/kvm_emulate.h>

#include <asm/kvm_coproc.h>

#include <linux/init.h>

#include "sys_regs.h"

static bool access_actlr(struct kvm_vcpu *vcpu,

			 const struct sys_reg_params *p,

			 const struct sys_reg_desc *r)

{

	if (p->is_write)

		return ignore_write(vcpu, p);

	*vcpu_reg(vcpu, p->Rt) = vcpu_sys_reg(vcpu, ACTLR_EL1);

	return true;

}

static void reset_actlr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)

{

	u64 actlr;

	asm volatile("mrs %0, actlr_el1\n" : "=r" (actlr));

	vcpu_sys_reg(vcpu, ACTLR_EL1) = actlr;

}

/*

 * Implementation specific sys-reg registers.

 * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2

 */

static const struct sys_reg_desc genericv8_sys_regs[] = {

	/* ACTLR_EL1 */

	{ Op0(0b11), Op1(0b000), CRn(0b0001), CRm(0b0000), Op2(0b001),

	  access_actlr, reset_actlr, ACTLR_EL1 },

};

static struct kvm_sys_reg_target_table genericv8_target_table = {

	.table64 = {

		.table = genericv8_sys_regs,

		.num = ARRAY_SIZE(genericv8_sys_regs),

	},

};

static int __init sys_reg_genericv8_init(void)

{

	unsigned int i;

	for (i = 1; i < ARRAY_SIZE(genericv8_sys_regs); i++)

		BUG_ON(cmp_sys_reg(&genericv8_sys_regs[i-1],

			       &genericv8_sys_regs[i]) >= 0);

	kvm_register_target_sys_reg_table(KVM_ARM_TARGET_AEM_V8,

					  &genericv8_target_table);

	kvm_register_target_sys_reg_table(KVM_ARM_TARGET_FOUNDATION_V8,

					  &genericv8_target_table);

	kvm_register_target_sys_reg_table(KVM_ARM_TARGET_CORTEX_A57,

					  &genericv8_target_table);

	return 0;

}

late_initcall(sys_reg_genericv8_init);