diff options
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-kvm-device.c | 83 |
1 files changed, 79 insertions, 4 deletions
diff --git a/virt/kvm/arm/vgic/vgic-kvm-device.c b/virt/kvm/arm/vgic/vgic-kvm-device.c index ff332f34a221..05ff925f5377 100644 --- a/virt/kvm/arm/vgic/vgic-kvm-device.c +++ b/virt/kvm/arm/vgic/vgic-kvm-device.c @@ -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; } |