linux-kernel - Re: [PATCH v3 0/3] vfio/pci: s390: Fix issues preventing VFIO_PCI

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Date: Fri, 7 Jun 2024 11:23:22 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: Alex Williamson <alex.williamson@...hat.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Gerd Bayer <gbayer@...ux.ibm.com>,
	Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 0/3] vfio/pci: s390: Fix issues preventing
 VFIO_PCI_MMAP=y for s390 and enable it

On Fri, Jun 07, 2024 at 09:47:08AM +0200, Niklas Schnelle wrote:
> I trust your judgement and was unsure too. I think for the
> s390_mmio_read/write syscalls the only existing users out there are via
> rdma-core, so unless Jason tells us that he thinks they could also be
> affected by the lack of page fault handling I see no problem in going
> upstream only.

rdma doesn't use the fault path for the doorbell mmio.

Jason