Re: [Qemu-devel] [PATCH RFC 1/1] KVM: s390: Add MEMOP ioctl for reading/writing guest memory

[Paolo Bonzini]

On 04/02/2015 12:25, Christian Borntraeger wrote:
> Whenever vhost or qemu or a finished aio request wrote content into a
> virtio buffer, the HW has set the storage key for that physical page,
> which  makes it automatically dirty/referenced in the guest visible
> storage key. 

Ah, I knew the storage keys were per-physical page, but I wasn't sure if
they were separate for the host and the guest.  That's obvious now.

Can we detect non-zero storage key in emulated zPCI requests, and fail
the request somehow?

Paolo