From: Jason Gunthorpe <jgg@nvidia.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: Max Gurtovoy <mgurtovoy@nvidia.com>,
Cornelia Huck <cohuck@redhat.com>,
Matthew Rosato <mjrosato@linux.ibm.com>, <kvm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <liranl@nvidia.com>,
<oren@nvidia.com>, <tzahio@nvidia.com>, <leonro@nvidia.com>,
<yarong@nvidia.com>, <aviadye@nvidia.com>, <shahafs@nvidia.com>,
<artemp@nvidia.com>, <kwankhede@nvidia.com>, <ACurrid@nvidia.com>,
<gmataev@nvidia.com>, <cjia@nvidia.com>, <yishaih@nvidia.com>,
<aik@ozlabs.ru>
Subject: Re: [PATCH 8/9] vfio/pci: use x86 naming instead of igd
Date: Tue, 2 Feb 2021 16:44:32 -0400 [thread overview]
Message-ID: <20210202204432.GC4247@nvidia.com> (raw)
In-Reply-To: <20210202123723.6cc018b8@omen.home.shazbot.org>
On Tue, Feb 02, 2021 at 12:37:23PM -0700, Alex Williamson wrote:
> For the most part, this explicit bind interface is redundant to
> driver_override, which already avoids the duplicate ID issue.
No, the point here is to have the ID tables in the PCI drivers because
they fundamentally only work with their supported IDs. The normal
driver core ID tables are a replacement for all the hardwired if's in
vfio_pci.
driver_override completely disables all the ID checking, it seems only
useful for vfio_pci which works with everything. It should not be used
with something like nvlink_vfio_pci.ko that needs ID checking.
Yes, this DRIVER_EXPLICIT_BIND_ONLY idea somewhat replaces
driver_override because we could set the PCI any match on vfio_pci and
manage the driver binding explicitly instead.
> A driver id table doesn't really help for binding the device,
> ultimately even if a device is in the id table it might fail to
> probe due to the missing platform support that each of these igd and
> nvlink drivers expose,
What happens depends on what makes sense for the driver, some missing
optional support could continue without it, or it could fail.
IGD and nvlink can trivially go onwards and work if they don't find
the platform support.
Or they might want to fail, I think the mlx5 and probably nvlink
drivers should fail as they are intended to be coupled with userspace
that expects to use their extended features.
In those cases failing is a feature because it prevents the whole
system from going into an unexpected state.
Jason
next prev parent reply other threads:[~2021-02-02 20:45 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 16:28 [PATCH v2 0/9] Introduce vfio-pci-core subsystem Max Gurtovoy
2021-02-01 16:28 ` [PATCH 1/9] vfio-pci: rename vfio_pci.c to vfio_pci_core.c Max Gurtovoy
2021-02-01 16:28 ` [PATCH 2/9] vfio-pci: introduce vfio_pci_core subsystem driver Max Gurtovoy
2021-02-01 16:28 ` [PATCH 3/9] vfio-pci-core: export vfio_pci_register_dev_region function Max Gurtovoy
2021-02-01 16:28 ` [PATCH 4/9] mlx5-vfio-pci: add new vfio_pci driver for mlx5 devices Max Gurtovoy
2021-02-01 16:28 ` [PATCH 5/9] vfio-pci/zdev: remove unused vdev argument Max Gurtovoy
2021-02-01 17:27 ` Matthew Rosato
2021-02-02 7:57 ` Cornelia Huck
2021-02-02 17:21 ` Alex Williamson
2021-02-01 16:28 ` [PATCH 6/9] vfio-pci/zdev: fix possible segmentation fault issue Max Gurtovoy
2021-02-01 16:52 ` Cornelia Huck
2021-02-01 17:08 ` Matthew Rosato
2021-02-01 20:47 ` Alex Williamson
2021-02-02 7:58 ` Cornelia Huck
2021-02-01 16:28 ` [PATCH 7/9] vfio/pci: use s390 naming instead of zdev Max Gurtovoy
2021-02-01 16:28 ` [PATCH 8/9] vfio/pci: use x86 naming instead of igd Max Gurtovoy
2021-02-01 17:14 ` Cornelia Huck
2021-02-01 17:49 ` Matthew Rosato
2021-02-01 18:42 ` Alex Williamson
2021-02-02 16:06 ` Cornelia Huck
2021-02-02 17:10 ` Jason Gunthorpe
2021-02-11 15:47 ` Max Gurtovoy
2021-02-11 16:29 ` Matthew Rosato
2021-02-11 17:39 ` Cornelia Huck
2021-02-02 17:41 ` Max Gurtovoy
2021-02-02 17:54 ` Alex Williamson
2021-02-02 18:50 ` Jason Gunthorpe
2021-02-02 18:55 ` Christoph Hellwig
2021-02-02 19:05 ` Jason Gunthorpe
2021-02-02 19:37 ` Alex Williamson
2021-02-02 20:44 ` Jason Gunthorpe [this message]
2021-02-02 20:59 ` Max Gurtovoy
2021-02-02 21:30 ` Alex Williamson
2021-02-02 23:06 ` Jason Gunthorpe
2021-02-02 23:59 ` Alex Williamson
2021-02-03 13:54 ` Jason Gunthorpe
2021-02-11 8:47 ` Christoph Hellwig
2021-02-11 14:30 ` Jason Gunthorpe
2021-02-11 8:44 ` Christoph Hellwig
2021-02-11 19:43 ` Alex Williamson
[not found] ` <806c138e-685c-0955-7c15-93cb1d4fe0d9@ozlabs.ru>
2021-02-03 16:07 ` Max Gurtovoy
[not found] ` <83ef0164-6291-c3d1-0ce5-2c9d6c97469e@ozlabs.ru>
2021-02-04 12:51 ` Jason Gunthorpe
2021-02-05 0:42 ` Alexey Kardashevskiy
2021-02-08 12:44 ` Max Gurtovoy
2021-02-09 1:55 ` Alexey Kardashevskiy
2021-02-08 18:13 ` Jason Gunthorpe
2021-02-09 1:51 ` Alexey Kardashevskiy
2021-02-04 9:12 ` Max Gurtovoy
2021-02-11 8:50 ` Christoph Hellwig
2021-02-11 14:49 ` Jason Gunthorpe
2021-02-01 16:28 ` [PATCH 9/9] vfio/pci: use powernv naming instead of nvlink2 Max Gurtovoy
2021-02-01 18:35 ` Jason Gunthorpe
2021-02-10 7:52 ` [PATCH v2 0/9] Introduce vfio-pci-core subsystem Tian, Kevin
2021-02-10 13:34 ` Jason Gunthorpe
2021-02-10 16:37 ` Alex Williamson
2021-02-10 17:08 ` Jason Gunthorpe
2021-02-11 8:36 ` Christoph Hellwig
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