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Date: Fri, 8 Apr 2022 09:45:36 -0300 From: Jason Gunthorpe <jgg@...pe.ca> To: Matthew Rosato <mjrosato@...ux.ibm.com> Cc: linux-s390@...r.kernel.org, alex.williamson@...hat.com, cohuck@...hat.com, schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com, borntraeger@...ux.ibm.com, hca@...ux.ibm.com, gor@...ux.ibm.com, gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com, svens@...ux.ibm.com, frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com, vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com, thuth@...hat.com, pasic@...ux.ibm.com, pbonzini@...hat.com, corbet@....net, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org Subject: Re: [PATCH v5 16/21] KVM: vfio: add s390x hook to register KVM guest designation 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@...ux.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
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