Commit fca25602 authored by Eric Auger's avatar Eric Auger Committed by Christoffer Dall
Browse files

KVM: arm/arm64: vgic-new: vgic_kvm_device: KVM_DEV_ARM_VGIC_GRP_NR_IRQS 



This patch implements the KVM_DEV_ARM_VGIC_GRP_NR_IRQS group. This
modality is supported by both VGIC V2 and V3 KVM device as will be
other groups, hence the introduction of common helpers.

Signed-off-by: default avatarEric Auger <eric.auger@linaro.org>
Signed-off-by: default avatarAndre Przywara <andre.przywara@arm.com>
Reviewed-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
parent c86c7721

virt/kvm/arm/vgic/vgic-kvm-device.c

+79 −4
Original line number Diff line number Diff line
@@ -15,9 +15,69 @@ 
 */

#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);
@@ -49,18 +109,29 @@ void kvm_register_vgic_device(unsigned long type) 
static int vgic_v2_set_attr(struct kvm_device *dev,

			    struct kvm_device_attr *attr)

{

	return -ENXIO;

	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)

{

	return -ENXIO;

	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;

}
@@ -80,18 +151,22 @@ struct kvm_device_ops kvm_arm_vgic_v2_ops = { 
static int vgic_v3_set_attr(struct kvm_device *dev,

			    struct kvm_device_attr *attr)

{

	return -ENXIO;

	return vgic_set_common_attr(dev, attr);

}



static int vgic_v3_get_attr(struct kvm_device *dev,

			    struct kvm_device_attr *attr)

{

	return -ENXIO;

	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;

}

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