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KVM: arm64: vgic-its: KVM_DEV_ARM_VGIC_GRP_ITS_REGS group

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The ITS KVM device exposes a new KVM_DEV_ARM_VGIC_GRP_ITS_REGS
group which allows the userspace to save/restore ITS registers.

At this stage the get/set/has operations are not yet implemented.

Signed-off-by: Eric Auger <[email protected]>
Reviewed-by: Andre Przywara <[email protected]>
Reviewed-by: Christoffer Dall <[email protected]>
Acked-by: Marc Zyngier <[email protected]>
This commit is contained in:
Eric Auger 2016-12-20 01:36:35 -05:00 • committed by Christoffer Dall
commit 876ae234cb
3 changed files with 37 additions and 1 deletions
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36
virt/kvm/arm/vgic/vgic-its.c
View file

@ -1466,6 +1466,19 @@ static void vgic_its_destroy(struct kvm_device *kvm_dev)
kfree(its);
}
int vgic_its_has_attr_regs(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
return -ENXIO;
}
int vgic_its_attr_regs_access(struct kvm_device *dev,
struct kvm_device_attr *attr,
u64 *reg, bool is_write)
{
return -ENXIO;
}
static int vgic_its_has_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
@ -1482,6 +1495,8 @@ static int vgic_its_has_attr(struct kvm_device *dev,
return 0;
}
break;
case KVM_DEV_ARM_VGIC_GRP_ITS_REGS:
return vgic_its_has_attr_regs(dev, attr);
}
return -ENXIO;
}
@ -1521,6 +1536,15 @@ static int vgic_its_set_attr(struct kvm_device *dev,
return 0;
}
break;
case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: {
u64 __user *uaddr = (u64 __user *)(long)attr->addr;
u64 reg;
if (get_user(reg, uaddr))
return -EFAULT;
return vgic_its_attr_regs_access(dev, attr, &reg, true);
}
}
return -ENXIO;
}
@ -1541,10 +1565,20 @@ static int vgic_its_get_attr(struct kvm_device *dev,
if (copy_to_user(uaddr, &addr, sizeof(addr)))
return -EFAULT;
break;
}
case KVM_DEV_ARM_VGIC_GRP_ITS_REGS: {
u64 __user *uaddr = (u64 __user *)(long)attr->addr;
u64 reg;
int ret;
ret = vgic_its_attr_regs_access(dev, attr, &reg, false);
if (ret)
return ret;
return put_user(reg, uaddr);
}
default:
return -ENXIO;
}
}
return 0;
}