Re: [PATCH v5 16/21] KVM: vfio: add s390x hook to register KVM guest designation

[Jason Gunthorpe <jgg@ziepe.ca>]

On Mon, Apr 04, 2022 at 01:43:44PM -0400, Matthew Rosato wrote:
> At the time a KVM is associated with a vfio group, s390x zPCI devices
> must register a special guest indication (GISA designation) to allow
> for the use of interpretive execution facilities.  This indication is
> used to ensure that only the specified KVM can interact with the device.
> Similarly, the indication must be removed once the KVM is no longer
> associated with the device.
> 
> This patch adds an s390-specific hook to invoke a KVM registration routine
> for each device associated with the iommu group; in reality, it will be a
> NOP for all but zPCI devices on s390x.
> 
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
>  virt/kvm/vfio.c | 35 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 34 insertions(+), 1 deletion(-)

I wonder if this should be done in the vfio_pci side from the existing
kvm notifier

Jason