arm64: KVM: virtual CPU reset

/*

 * Copyright (C) 2012,2013 - ARM Ltd

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

 *

 * Derived from arch/arm/kvm/reset.c

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

 * Author: 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/errno.h>

#include <linux/kvm_host.h>

#include <linux/kvm.h>

#include <asm/cputype.h>

#include <asm/ptrace.h>

#include <asm/kvm_arm.h>

#include <asm/kvm_coproc.h>

/*

 * ARMv8 Reset Values

 */

static const struct kvm_regs default_regs_reset = {

	.regs.pstate = (PSR_MODE_EL1h | PSR_A_BIT | PSR_I_BIT |

			PSR_F_BIT | PSR_D_BIT),

};

int kvm_arch_dev_ioctl_check_extension(long ext)

{

	int r;

	switch (ext) {

	default:

		r = 0;

	}

	return r;

}

/**

 * kvm_reset_vcpu - sets core registers and sys_regs to reset value

 * @vcpu: The VCPU pointer

 *

 * This function finds the right table above and sets the registers on

 * the virtual CPU struct to their architectually defined reset

 * values.

 */

int kvm_reset_vcpu(struct kvm_vcpu *vcpu)

{

	const struct kvm_regs *cpu_reset;

	switch (vcpu->arch.target) {

	default:

		cpu_reset = &default_regs_reset;

		break;

	}

	/* Reset core registers */

	memcpy(vcpu_gp_regs(vcpu), cpu_reset, sizeof(*cpu_reset));

	/* Reset system registers */

	kvm_reset_sys_regs(vcpu);

	return 0;

}