From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Logan Gunthorpe <logang@deltatee.com>,
LKML <linux-kernel@vger.kernel.org>,
Bjorn Helgaas <helgaas@kernel.org>, Marc Zygnier <maz@kernel.org>,
Alex Williamson <alex.williamson@redhat.com>,
Kevin Tian <kevin.tian@intel.com>,
Megha Dey <megha.dey@intel.com>, Ashok Raj <ashok.raj@intel.com>,
linux-pci@vger.kernel.org, Jon Mason <jdmason@kudzu.us>,
Dave Jiang <dave.jiang@intel.com>,
Allen Hubbe <allenbh@gmail.com>,
linux-ntb@googlegroups.com, linux-s390@vger.kernel.org,
Heiko Carstens <hca@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
x86@kernel.org, Joerg Roedel <jroedel@suse.de>,
iommu@lists.linux-foundation.org
Subject: Re: [patch 21/32] NTB/msi: Convert to msi_on_each_desc()
Date: Thu, 2 Dec 2021 15:23:38 +0100 [thread overview]
Message-ID: <YajW6veanK4GZUkv@kroah.com> (raw)
In-Reply-To: <20211202135502.GP4670@nvidia.com>
On Thu, Dec 02, 2021 at 09:55:02AM -0400, Jason Gunthorpe wrote:
> Further, there is no reason why IMS should be reserved exclusively for
> VFIO! Why shouldn't the cdev be able to use IMS vectors too? It is
> just a feature of the PCI device like MSI. If the queue has a PASID it
> can use IDXD's IMS.
No, sorry, but a cdev is not for anything resembling any real resource
at all.
It is ONLY for the /dev/NODE interface that controls the character
device api to userspace. The struct device involved in it is ONLY for
that, nothing else. Any attempt to add things to it will be gleefully
rejected.
The cdev api today (in the kernel) exposes too much mess and there's at
least 4 or 5 different ways to use it. It's on my long-term TODO list
to fix this up to not even allow abuses like you are considering here,
so please don't do that.
> If we really need a 2nd struct device to turn on IMS then, I'd suggest
> picking the cdev, as it keeps IMS and its allocator inside the IDXD
> PCIe driver and not in the VFIO world.
No! Again, a cdev is to control the lifespan/lifecycle of the /dev/NODE
only. Anything other than that is not ok to do at all.
thanks,
greg k-h
next prev parent reply other threads:[~2021-12-02 14:23 UTC|newest]
Thread overview: 184+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-27 1:22 [patch 00/32] genirq/msi, PCI/MSI: Spring cleaning - Part 2 Thomas Gleixner
2021-11-27 1:22 ` [patch 01/32] genirq/msi: Move descriptor list to struct msi_device_data Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 12:19 ` Greg Kroah-Hartman
2021-11-27 1:22 ` [patch 02/32] genirq/msi: Add mutex for MSI list protection Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 03/32] genirq/msi: Provide msi_domain_alloc/free_irqs_descs_locked() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 04/32] genirq/msi: Provide a set of advanced MSI accessors and iterators Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-28 1:00 ` Jason Gunthorpe
2021-11-28 19:22 ` Thomas Gleixner
2021-11-29 9:26 ` Thomas Gleixner
2021-11-29 14:01 ` Jason Gunthorpe
2021-11-29 14:46 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 05/32] genirq/msi: Provide msi_alloc_msi_desc() and a simple allocator Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 06/32] genirq/msi: Provide domain flags to allocate/free MSI descriptors automatically Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 07/32] genirq/msi: Count the allocated MSI descriptors Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 12:19 ` Greg Kroah-Hartman
2021-11-27 19:22 ` Thomas Gleixner
2021-11-27 19:45 ` Thomas Gleixner
2021-11-28 11:07 ` Greg Kroah-Hartman
2021-11-28 19:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 08/32] PCI/MSI: Protect MSI operations Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 09/32] PCI/MSI: Use msi_add_msi_desc() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 10/32] PCI/MSI: Let core code free MSI descriptors Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 11/32] PCI/MSI: Use msi_on_each_desc() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 12/32] x86/pci/xen: Use msi_for_each_desc() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 13/32] xen/pcifront: Rework MSI handling Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 14/32] s390/pci: Rework MSI descriptor walk Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-29 10:31 ` Niklas Schnelle
2021-11-29 13:04 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 15/32] powerpc/4xx/hsta: Rework MSI handling Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 16/32] powerpc/cell/axon_msi: Convert to msi_on_each_desc() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 17/32] powerpc/pasemi/msi: Convert to msi_on_each_dec() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 18/32] powerpc/fsl_msi: Use msi_for_each_desc() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 19/32] powerpc/mpic_u3msi: Use msi_for_each-desc() Thomas Gleixner
2021-11-27 1:23 ` Thomas Gleixner
2021-11-27 1:22 ` [patch 20/32] PCI: hv: Rework MSI handling Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 21/32] NTB/msi: Convert to msi_on_each_desc() Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-29 18:21 ` Logan Gunthorpe
2021-11-29 20:51 ` Thomas Gleixner
2021-11-29 22:27 ` Logan Gunthorpe
2021-11-29 22:50 ` Dave Jiang
2021-11-29 23:31 ` Jason Gunthorpe
2021-11-29 23:52 ` Logan Gunthorpe
2021-11-30 0:01 ` Jason Gunthorpe
2021-11-30 0:29 ` Thomas Gleixner
2021-11-30 19:21 ` Logan Gunthorpe
2021-11-30 19:48 ` Thomas Gleixner
2021-11-30 20:14 ` Logan Gunthorpe
2021-11-30 20:28 ` Jason Gunthorpe
2021-11-30 21:23 ` Thomas Gleixner
2021-12-01 0:17 ` Jason Gunthorpe
2021-12-01 10:16 ` Thomas Gleixner
2021-12-01 13:00 ` Jason Gunthorpe
2021-12-01 17:35 ` Thomas Gleixner
2021-12-01 18:14 ` Jason Gunthorpe
2021-12-01 18:46 ` Logan Gunthorpe
2021-12-01 20:21 ` Thomas Gleixner
2021-12-02 0:01 ` Thomas Gleixner
2021-12-02 13:55 ` Jason Gunthorpe
2021-12-02 14:23 ` Greg Kroah-Hartman [this message]
2021-12-02 14:45 ` Jason Gunthorpe
2021-12-02 19:25 ` Thomas Gleixner
2021-12-02 20:00 ` Jason Gunthorpe
2021-12-02 22:31 ` Thomas Gleixner
2021-12-03 0:37 ` Jason Gunthorpe
2021-12-03 15:07 ` Thomas Gleixner
2021-12-03 16:41 ` Jason Gunthorpe
2021-12-04 14:20 ` Thomas Gleixner
2021-12-05 14:16 ` Thomas Gleixner
2021-12-06 14:43 ` Jason Gunthorpe
2021-12-06 15:47 ` Thomas Gleixner
2021-12-06 17:00 ` Jason Gunthorpe
2021-12-06 20:28 ` Thomas Gleixner
2021-12-06 21:06 ` Jason Gunthorpe
2021-12-06 22:21 ` Thomas Gleixner
2021-12-06 14:19 ` Jason Gunthorpe
2021-12-06 15:06 ` Thomas Gleixner
2021-12-09 6:26 ` Tian, Kevin
2021-12-09 9:03 ` Thomas Gleixner
2021-12-09 12:17 ` Tian, Kevin
2021-12-09 15:57 ` Thomas Gleixner
2021-12-10 7:37 ` Tian, Kevin
2021-12-09 5:41 ` Tian, Kevin
2021-12-09 5:47 ` Jason Wang
2021-12-01 16:28 ` Dave Jiang
2021-12-01 18:41 ` Thomas Gleixner
2021-12-01 18:47 ` Dave Jiang
2021-12-01 20:25 ` Thomas Gleixner
2021-12-01 21:21 ` Dave Jiang
2021-12-01 21:44 ` Thomas Gleixner
2021-12-01 21:49 ` Dave Jiang
2021-12-01 22:03 ` Thomas Gleixner
2021-12-01 22:53 ` Dave Jiang
2021-12-01 23:57 ` Thomas Gleixner
2021-12-09 5:23 ` Tian, Kevin
2021-12-09 8:37 ` Thomas Gleixner
2021-12-09 12:31 ` Tian, Kevin
2021-12-09 16:21 ` Jason Gunthorpe
2021-12-09 20:32 ` Thomas Gleixner
2021-12-09 20:58 ` Jason Gunthorpe
2021-12-09 22:09 ` Thomas Gleixner
2021-12-10 0:26 ` Thomas Gleixner
2021-12-10 7:29 ` Tian, Kevin
2021-12-10 12:13 ` Thomas Gleixner
2021-12-11 8:06 ` Tian, Kevin
2021-12-10 12:39 ` Jason Gunthorpe
2021-12-10 19:00 ` Thomas Gleixner
2021-12-11 7:44 ` Tian, Kevin
2021-12-11 13:04 ` Thomas Gleixner
2021-12-12 1:56 ` Tian, Kevin
2021-12-12 20:55 ` Thomas Gleixner
2021-12-12 23:37 ` Jason Gunthorpe
2021-12-13 7:50 ` Tian, Kevin
2022-09-15 9:24 ` Tian, Kevin
2022-09-20 14:09 ` Jason Gunthorpe
2022-09-21 7:57 ` Tian, Kevin
2022-09-21 12:48 ` Jason Gunthorpe
2022-09-22 5:11 ` Tian, Kevin
2022-09-22 12:13 ` Jason Gunthorpe
2022-09-22 22:42 ` Tian, Kevin
2022-09-23 13:26 ` Jason Gunthorpe
2021-12-11 7:52 ` Tian, Kevin
2021-12-12 0:12 ` Thomas Gleixner
2021-12-12 2:14 ` Tian, Kevin
2021-12-12 20:50 ` Thomas Gleixner
2021-12-12 23:42 ` Jason Gunthorpe
2021-12-10 7:36 ` Tian, Kevin
2021-12-10 12:30 ` Jason Gunthorpe
2021-12-12 6:44 ` Mika Penttilä
2021-12-12 23:27 ` Jason Gunthorpe
2021-12-01 14:52 ` Thomas Gleixner
2021-12-01 15:11 ` Jason Gunthorpe
2021-12-01 18:37 ` Thomas Gleixner
2021-12-01 18:47 ` Jason Gunthorpe
2021-12-01 20:26 ` Thomas Gleixner
2022-12-05 18:25 ` [tip: irq/core] PCI/MSI: Provide post-enable dynamic allocation interfaces for MSI-X tip-bot2 for Thomas Gleixner
2022-12-05 21:41 ` tip-bot2 for Thomas Gleixner
2021-11-27 1:23 ` [patch 22/32] soc: ti: ti_sci_inta_msi: Rework MSI descriptor allocation Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 23/32] soc: ti: ti_sci_inta_msi: Remove ti_sci_inta_msi_domain_free_irqs() Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 24/32] bus: fsl-mc-msi: Simplify MSI descriptor handling Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 25/32] platform-msi: Let core code handle MSI descriptors Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 26/32] platform-msi: Simplify platform device MSI code Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 27/32] genirq/msi: Make interrupt allocation less convoluted Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 28/32] genirq/msi: Convert to new functions Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 29/32] genirq/msi: Mop up old interfaces Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 30/32] genirq/msi: Add abuse prevention comment to msi header Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 31/32] genirq/msi: Simplify sysfs handling Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 12:32 ` Greg Kroah-Hartman
2021-11-27 19:31 ` Thomas Gleixner
2021-11-28 11:07 ` Greg Kroah-Hartman
2021-11-28 19:33 ` Thomas Gleixner
2021-11-27 1:23 ` [patch 32/32] genirq/msi: Convert storage to xarray Thomas Gleixner
2021-11-27 1:24 ` Thomas Gleixner
2021-11-27 12:33 ` Greg Kroah-Hartman
2021-11-27 1:23 ` [patch 00/32] genirq/msi, PCI/MSI: Spring cleaning - Part 2 Thomas Gleixner
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