[thirdparty/kernel/linux.git] / virt / kvm / arm / vgic / vgic-kvm-device.c

/*
 * VGIC: KVM DEVICE API
 *
 * Copyright (C) 2015 ARM Ltd.
 * Author: Marc Zyngier <marc.zyngier@arm.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.
 */
#include <linux/kvm_host.h>
#include <kvm/arm_vgic.h>
#include <linux/uaccess.h>
#include "vgic.h"

/* common helpers */

static int vgic_set_common_attr(struct kvm_device *dev,
				struct kvm_device_attr *attr)
{
	switch (attr->group) {
	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
		u32 __user *uaddr = (u32 __user *)(long)attr->addr;
		u32 val;
		int ret = 0;

		if (get_user(val, uaddr))
			return -EFAULT;

		/*
		 * We require:
		 * - at least 32 SPIs on top of the 16 SGIs and 16 PPIs
		 * - at most 1024 interrupts
		 * - a multiple of 32 interrupts
		 */
		if (val < (VGIC_NR_PRIVATE_IRQS + 32) ||
		    val > VGIC_MAX_RESERVED ||
		    (val & 31))
			return -EINVAL;

		mutex_lock(&dev->kvm->lock);

		if (vgic_ready(dev->kvm) || dev->kvm->arch.vgic.nr_spis)
			ret = -EBUSY;
		else
			dev->kvm->arch.vgic.nr_spis =
				val - VGIC_NR_PRIVATE_IRQS;

		mutex_unlock(&dev->kvm->lock);

		return ret;
	}
	}

	return -ENXIO;
}

static int vgic_get_common_attr(struct kvm_device *dev,
				struct kvm_device_attr *attr)
{
	int r = -ENXIO;

	switch (attr->group) {
	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
		u32 __user *uaddr = (u32 __user *)(long)attr->addr;

		r = put_user(dev->kvm->arch.vgic.nr_spis +
			     VGIC_NR_PRIVATE_IRQS, uaddr);
		break;
	}
	}

	return r;
}

static int vgic_create(struct kvm_device *dev, u32 type)
{
	return kvm_vgic_create(dev->kvm, type);
}

static void vgic_destroy(struct kvm_device *dev)
{
	kfree(dev);
}

void kvm_register_vgic_device(unsigned long type)
{
	switch (type) {
	case KVM_DEV_TYPE_ARM_VGIC_V2:
		kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
					KVM_DEV_TYPE_ARM_VGIC_V2);
		break;
#ifdef CONFIG_KVM_ARM_VGIC_V3
	case KVM_DEV_TYPE_ARM_VGIC_V3:
		kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
					KVM_DEV_TYPE_ARM_VGIC_V3);
		break;
#endif
	}
}

/* V2 ops */

static int vgic_v2_set_attr(struct kvm_device *dev,
			    struct kvm_device_attr *attr)
{
	int ret;

	ret = vgic_set_common_attr(dev, attr);
	return ret;

}

static int vgic_v2_get_attr(struct kvm_device *dev,
			    struct kvm_device_attr *attr)
{
	int ret;

	ret = vgic_get_common_attr(dev, attr);
	return ret;
}

static int vgic_v2_has_attr(struct kvm_device *dev,
			    struct kvm_device_attr *attr)
{
	switch (attr->group) {
	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
		return 0;
	}
	return -ENXIO;
}

struct kvm_device_ops kvm_arm_vgic_v2_ops = {
	.name = "kvm-arm-vgic-v2",
	.create = vgic_create,
	.destroy = vgic_destroy,
	.set_attr = vgic_v2_set_attr,
	.get_attr = vgic_v2_get_attr,
	.has_attr = vgic_v2_has_attr,
};

/* V3 ops */

#ifdef CONFIG_KVM_ARM_VGIC_V3

static int vgic_v3_set_attr(struct kvm_device *dev,
			    struct kvm_device_attr *attr)
{
	return vgic_set_common_attr(dev, attr);
}

static int vgic_v3_get_attr(struct kvm_device *dev,
			    struct kvm_device_attr *attr)
{
	return vgic_get_common_attr(dev, attr);
}

static int vgic_v3_has_attr(struct kvm_device *dev,
			    struct kvm_device_attr *attr)
{
	switch (attr->group) {
	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
		return 0;
	}
	return -ENXIO;
}

struct kvm_device_ops kvm_arm_vgic_v3_ops = {
	.name = "kvm-arm-vgic-v3",
	.create = vgic_create,
	.destroy = vgic_destroy,
	.set_attr = vgic_v3_set_attr,
	.get_attr = vgic_v3_get_attr,
	.has_attr = vgic_v3_has_attr,
};

#endif /* CONFIG_KVM_ARM_VGIC_V3 */
Commit	Line	Data
c86c7721 EA	1	/*
	2	* VGIC: KVM DEVICE API
	3	*
	4	* Copyright (C) 2015 ARM Ltd.
	5	* Author: Marc Zyngier <marc.zyngier@arm.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*/
	16	#include <linux/kvm_host.h>
	17	#include <kvm/arm_vgic.h>
fca25602 EA	18	#include <linux/uaccess.h>
fca25602 EA	19	#include "vgic.h"
c86c7721 EA	20
	21	/* common helpers */
	22
fca25602 EA	23	static int vgic_set_common_attr(struct kvm_device *dev,
	24	struct kvm_device_attr *attr)
	25	{
	26	switch (attr->group) {
	27	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
	28	u32 __user uaddr = (u32 __user )(long)attr->addr;
	29	u32 val;
	30	int ret = 0;
	31
	32	if (get_user(val, uaddr))
	33	return -EFAULT;
	34
	35	/*
	36	* We require:
	37	* - at least 32 SPIs on top of the 16 SGIs and 16 PPIs
	38	* - at most 1024 interrupts
	39	* - a multiple of 32 interrupts
	40	*/
	41	if (val < (VGIC_NR_PRIVATE_IRQS + 32) \|\|
	42	val > VGIC_MAX_RESERVED \|\|
	43	(val & 31))
	44	return -EINVAL;
	45
	46	mutex_lock(&dev->kvm->lock);
	47
	48	if (vgic_ready(dev->kvm) \|\| dev->kvm->arch.vgic.nr_spis)
	49	ret = -EBUSY;
	50	else
	51	dev->kvm->arch.vgic.nr_spis =
	52	val - VGIC_NR_PRIVATE_IRQS;
	53
	54	mutex_unlock(&dev->kvm->lock);
	55
	56	return ret;
	57	}
	58	}
	59
	60	return -ENXIO;
	61	}
	62
	63	static int vgic_get_common_attr(struct kvm_device *dev,
	64	struct kvm_device_attr *attr)
	65	{
	66	int r = -ENXIO;
	67
	68	switch (attr->group) {
	69	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS: {
	70	u32 __user uaddr = (u32 __user )(long)attr->addr;
	71
	72	r = put_user(dev->kvm->arch.vgic.nr_spis +
	73	VGIC_NR_PRIVATE_IRQS, uaddr);
	74	break;
	75	}
	76	}
	77
	78	return r;
	79	}
	80
c86c7721 EA	81	static int vgic_create(struct kvm_device *dev, u32 type)
	82	{
	83	return kvm_vgic_create(dev->kvm, type);
	84	}
	85
	86	static void vgic_destroy(struct kvm_device *dev)
	87	{
	88	kfree(dev);
	89	}
	90
	91	void kvm_register_vgic_device(unsigned long type)
	92	{
	93	switch (type) {
	94	case KVM_DEV_TYPE_ARM_VGIC_V2:
	95	kvm_register_device_ops(&kvm_arm_vgic_v2_ops,
	96	KVM_DEV_TYPE_ARM_VGIC_V2);
	97	break;
	98	#ifdef CONFIG_KVM_ARM_VGIC_V3
	99	case KVM_DEV_TYPE_ARM_VGIC_V3:
	100	kvm_register_device_ops(&kvm_arm_vgic_v3_ops,
	101	KVM_DEV_TYPE_ARM_VGIC_V3);
	102	break;
	103	#endif
	104	}
	105	}
	106
	107	/* V2 ops */
	108
	109	static int vgic_v2_set_attr(struct kvm_device *dev,
	110	struct kvm_device_attr *attr)
	111	{
fca25602 EA	112	int ret;
	113
	114	ret = vgic_set_common_attr(dev, attr);
	115	return ret;
	116
c86c7721 EA	117	}
	118
	119	static int vgic_v2_get_attr(struct kvm_device *dev,
	120	struct kvm_device_attr *attr)
	121	{
fca25602 EA	122	int ret;
	123
	124	ret = vgic_get_common_attr(dev, attr);
	125	return ret;
c86c7721 EA	126	}
	127
	128	static int vgic_v2_has_attr(struct kvm_device *dev,
	129	struct kvm_device_attr *attr)
	130	{
fca25602 EA	131	switch (attr->group) {
	132	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
	133	return 0;
	134	}
c86c7721 EA	135	return -ENXIO;
	136	}
	137
	138	struct kvm_device_ops kvm_arm_vgic_v2_ops = {
	139	.name = "kvm-arm-vgic-v2",
	140	.create = vgic_create,
	141	.destroy = vgic_destroy,
	142	.set_attr = vgic_v2_set_attr,
	143	.get_attr = vgic_v2_get_attr,
	144	.has_attr = vgic_v2_has_attr,
	145	};
	146
	147	/* V3 ops */
	148
	149	#ifdef CONFIG_KVM_ARM_VGIC_V3
	150
	151	static int vgic_v3_set_attr(struct kvm_device *dev,
	152	struct kvm_device_attr *attr)
	153	{
fca25602	154	return vgic_set_common_attr(dev, attr);
c86c7721 EA	155	}
	156
	157	static int vgic_v3_get_attr(struct kvm_device *dev,
	158	struct kvm_device_attr *attr)
	159	{
fca25602	160	return vgic_get_common_attr(dev, attr);
c86c7721 EA	161	}
	162
	163	static int vgic_v3_has_attr(struct kvm_device *dev,
	164	struct kvm_device_attr *attr)
	165	{
fca25602 EA	166	switch (attr->group) {
	167	case KVM_DEV_ARM_VGIC_GRP_NR_IRQS:
	168	return 0;
	169	}
c86c7721 EA	170	return -ENXIO;
	171	}
	172
	173	struct kvm_device_ops kvm_arm_vgic_v3_ops = {
	174	.name = "kvm-arm-vgic-v3",
	175	.create = vgic_create,
	176	.destroy = vgic_destroy,
	177	.set_attr = vgic_v3_set_attr,
	178	.get_attr = vgic_v3_get_attr,
	179	.has_attr = vgic_v3_has_attr,
	180	};
	181
	182	#endif /* CONFIG_KVM_ARM_VGIC_V3 */
	183