From: Matthew Rosato <mjrosato@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>, Max Gurtovoy <mgurtovoy@nvidia.com>
Cc: jgg@nvidia.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, alex.williamson@redhat.com,
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: Mon, 1 Feb 2021 12:49:12 -0500 [thread overview]
Message-ID: <599c6452-8ba6-a00a-65e7-0167f21eac35@linux.ibm.com> (raw)
In-Reply-To: <20210201181454.22112b57.cohuck@redhat.com>
On 2/1/21 12:14 PM, Cornelia Huck wrote:
> On Mon, 1 Feb 2021 16:28:27 +0000
> Max Gurtovoy <mgurtovoy@nvidia.com> wrote:
>
>> This patch doesn't change any logic but only align to the concept of
>> vfio_pci_core extensions. Extensions that are related to a platform
>> and not to a specific vendor of PCI devices should be part of the core
>> driver. Extensions that are specific for PCI device vendor should go
>> to a dedicated vendor vfio-pci driver.
>
> My understanding is that igd means support for Intel graphics, i.e. a
> strict subset of x86. If there are other future extensions that e.g.
> only make sense for some devices found only on AMD systems, I don't
> think they should all be included under the same x86 umbrella.
>
> Similar reasoning for nvlink, that only seems to cover support for some
> GPUs under Power, and is not a general platform-specific extension IIUC.
>
> We can arguably do the zdev -> s390 rename (as zpci appears only on
> s390, and all PCI devices will be zpci on that platform), although I'm
> not sure about the benefit.
As far as I can tell, there isn't any benefit for s390 it's just
"re-branding" to match the platform name rather than the zdev moniker,
which admittedly perhaps makes it more clear to someone outside of s390
that any PCI device on s390 is a zdev/zpci type, and thus will use this
extension to vfio_pci(_core). This would still be true even if we added
something later that builds atop it (e.g. a platform-specific device
like ism-vfio-pci). Or for that matter, mlx5 via vfio-pci on s390x uses
these zdev extensions today and would need to continue using them in a
world where mlx5-vfio-pci.ko exists.
I guess all that to say: if such a rename matches the 'grand scheme' of
this design where we treat arch-level extensions to vfio_pci(_core) as
"vfio_pci_(arch)" then I'm not particularly opposed to the rename. But
by itself it's not very exciting :)
>
>>
>> For now, x86 extensions will include only igd.
>>
>> Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
>> ---
>> drivers/vfio/pci/Kconfig | 13 ++++++-------
>> drivers/vfio/pci/Makefile | 2 +-
>> drivers/vfio/pci/vfio_pci_core.c | 2 +-
>> drivers/vfio/pci/vfio_pci_private.h | 2 +-
>> drivers/vfio/pci/{vfio_pci_igd.c => vfio_pci_x86.c} | 0
>> 5 files changed, 9 insertions(+), 10 deletions(-)
>> rename drivers/vfio/pci/{vfio_pci_igd.c => vfio_pci_x86.c} (100%)
>
> (...)
>
>> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
>> index c559027def2d..e0e258c37fb5 100644
>> --- a/drivers/vfio/pci/vfio_pci_core.c
>> +++ b/drivers/vfio/pci/vfio_pci_core.c
>> @@ -328,7 +328,7 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
>>
>> if (vfio_pci_is_vga(pdev) &&
>> pdev->vendor == PCI_VENDOR_ID_INTEL &&
>> - IS_ENABLED(CONFIG_VFIO_PCI_IGD)) {
>> + IS_ENABLED(CONFIG_VFIO_PCI_X86)) {
>> ret = vfio_pci_igd_init(vdev);
>
> This one explicitly checks for Intel devices, so I'm not sure why you
> want to generalize this to x86?
>
>> if (ret && ret != -ENODEV) {
>> pci_warn(pdev, "Failed to setup Intel IGD regions\n");
>
next prev parent reply other threads:[~2021-02-01 17:51 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 [this message]
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
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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