From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Alex Williamson <alex.williamson@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
Eric Auger <eric.auger@redhat.com>,
Christoph Hellwig <hch@lst.de>, Yi Liu <yi.l.liu@intel.com>
Subject: Re: [PATCH 04/10] vfio: Use a struct of function pointers instead of a many symbol_get()'s
Date: Fri, 15 Apr 2022 06:45:34 +0200 [thread overview]
Message-ID: <20220415044533.GA22209@lst.de> (raw)
In-Reply-To: <4-v1-33906a626da1+16b0-vfio_kvm_no_group_jgg@nvidia.com>
On Thu, Apr 14, 2022 at 03:46:03PM -0300, Jason Gunthorpe wrote:
> kvm and VFIO need to be coupled together however neither is willing to
> tolerate a direct module dependency. Instead when kvm is given a VFIO FD
> it uses many symbol_get()'s to access VFIO.
>
> Provide a single VFIO function vfio_file_get_ops() which validates the
> given struct file * is a VFIO file and then returns a struct of ops.
>
> Following patches will redo each of the symbol_get() calls into an
> indirection through this ops struct.
So I got anoyed at this as well a while ago and I still think this
is the wrong way around.
I'd much rather EXPORT_SYMBOL_GPL kvm_register_device_ops and
just let kvm_vfio_ops live in a module than all the symbol_get
crazyness. We'll need to be careful to deal with unload races
or just not allow unloading, though.
next prev parent reply other threads:[~2022-04-15 4:45 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-14 18:45 [PATCH 00/10] Remove vfio_group from the struct file facing VFIO API Jason Gunthorpe
2022-04-14 18:46 ` [PATCH 01/10] kvm/vfio: Move KVM_DEV_VFIO_GROUP_* ioctls into functions Jason Gunthorpe
2022-04-15 3:36 ` Tian, Kevin
2022-04-15 7:18 ` Christoph Hellwig
2022-04-14 18:46 ` [PATCH 02/10] kvm/vfio: Reduce the scope of PPC #ifdefs Jason Gunthorpe
2022-04-15 4:47 ` Christoph Hellwig
2022-04-15 12:13 ` Jason Gunthorpe
2022-04-15 12:35 ` Jason Gunthorpe
2022-04-15 14:36 ` Christoph Hellwig
2022-04-14 18:46 ` [PATCH 03/10] kvm/vfio: Store the struct file in the kvm_vfio_group Jason Gunthorpe
2022-04-15 3:44 ` Tian, Kevin
2022-04-15 22:24 ` Jason Gunthorpe
2022-04-15 7:20 ` Christoph Hellwig
2022-04-19 19:24 ` Jason Gunthorpe
2022-04-14 18:46 ` [PATCH 04/10] vfio: Use a struct of function pointers instead of a many symbol_get()'s Jason Gunthorpe
2022-04-15 3:57 ` Tian, Kevin
2022-04-15 21:54 ` Jason Gunthorpe
2022-04-16 0:00 ` Tian, Kevin
2022-04-16 1:33 ` Jason Gunthorpe
2022-04-18 3:56 ` Tian, Kevin
2022-04-19 12:16 ` Jason Gunthorpe
2022-04-15 4:45 ` Christoph Hellwig [this message]
2022-04-15 12:13 ` Jason Gunthorpe
2022-04-15 14:36 ` Christoph Hellwig
2022-04-15 15:31 ` Jason Gunthorpe
2022-04-14 18:46 ` [PATCH 05/10] vfio: Move vfio_external_user_iommu_id() to vfio_file_ops Jason Gunthorpe
2022-04-15 3:59 ` Tian, Kevin
2022-04-15 7:31 ` Christoph Hellwig
2022-04-15 12:25 ` Jason Gunthorpe
2022-04-15 14:37 ` Christoph Hellwig
2022-04-14 18:46 ` [PATCH 06/10] vfio: Remove vfio_external_group_match_file() Jason Gunthorpe
2022-04-15 4:02 ` Tian, Kevin
2022-04-15 7:32 ` Christoph Hellwig
2022-04-14 18:46 ` [PATCH 07/10] vfio: Move vfio_external_check_extension() to vfio_file_ops Jason Gunthorpe
2022-04-15 4:07 ` Tian, Kevin
2022-04-19 19:23 ` Jason Gunthorpe
2022-04-20 3:05 ` Tian, Kevin
2022-04-15 4:48 ` Christoph Hellwig
2022-04-14 18:46 ` [PATCH 08/10] vfio: Move vfio_group_set_kvm() into vfio_file_ops Jason Gunthorpe
2022-04-15 4:09 ` Tian, Kevin
2022-04-14 18:46 ` [PATCH 09/10] kvm/vfio: Remove vfio_group from kvm Jason Gunthorpe
2022-04-15 4:21 ` Tian, Kevin
2022-04-15 21:56 ` Jason Gunthorpe
2022-04-16 0:42 ` Tian, Kevin
2022-04-16 1:34 ` Jason Gunthorpe
2022-04-18 6:09 ` Tian, Kevin
2022-04-14 18:46 ` [PATCH 10/10] vfio/pci: Use the struct file as the handle not the vfio_group Jason Gunthorpe
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