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

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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: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2015-12-21 16:33:22 +01:00 committed by Christoffer Dall
parent c86c772191
commit fca256026b
1 changed files with 79 additions and 4 deletions
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83
virt/kvm/arm/vgic/vgic-kvm-device.c
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@ -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;
}