Re: [PATCH v5 15/21] KVM: s390: pci: add routines to start/stop interpretive execution

[Matthew Rosato <mjrosato@linux.ibm.com>]

On 4/8/22 8:47 AM, Jason Gunthorpe wrote:
> On Mon, Apr 04, 2022 at 01:43:43PM -0400, Matthew Rosato wrote:
>> +int kvm_s390_pci_register_kvm(struct device *dev, void *data)
>> +{
>> +	struct zpci_dev *zdev = NULL;
>> +	struct kvm *kvm = data;
>> +
>> +	/* Only proceed for zPCI devices, quietly ignore others */
>> +	if (dev_is_pci(dev))
>> +		zdev = to_zpci_dev(dev);
>> +	if (!zdev)
>> +		return 0;
> 
> Especially since this only works if we have zpci device
> 
> So having the zpci code hook the kvm notifier and then call the arch
> code from the zpci area seems pretty OK
> 
> Also why is a struct kvm * being passed as a void *?

Only because the function is intended to be called via 
iommu_group_for_each_dev (next patch) which requires int (*fn)(struct 
device *, void *)