linux-kernel - Re: [PATCH] vfio: mlx5, pds: add IOMMU

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Date:   Mon, 23 Oct 2023 09:04:18 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        Joao Martins <joao.m.martins@...cle.com>
Cc:     Kevin Tian <kevin.tian@...el.com>, Arnd Bergmann <arnd@...db.de>,
        Yishai Hadas <yishaih@...dia.com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Brett Creeley <brett.creeley@....com>,
        Shixiong Ou <oushixiong@...inos.cn>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfio: mlx5, pds: add IOMMU_SUPPORT dependency

On Mon, Oct 23, 2023 at 01:55:03PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> Selecting IOMMUFD_DRIVER is not allowed if IOMMUs themselves are not supported:
> 
> WARNING: unmet direct dependencies detected for IOMMUFD_DRIVER
>   Depends on [n]: IOMMU_SUPPORT [=n]
>   Selected by [m]:
>   - MLX5_VFIO_PCI [=m] && VFIO [=y] && PCI [=y] && MMU [=y] && MLX5_CORE [=y]
> 
> There is no actual build failure, only the warning.
> 
> Make the 'select' conditional using the same logic that we have for
> INTEL_IOMMU and AMD_IOMMU.
> 
> Fixes: 33f6339534287 ("vfio: Move iova_bitmap into iommufd")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/vfio/pci/mlx5/Kconfig | 2 +-
>  drivers/vfio/pci/pds/Kconfig  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

But this isn't the logic this wants, it wants to turn on
IOMMUFD_DRIVER if MLX5_VFIO_PCI is turned on.

I think it means IOMMUFD_DRIVER should be lifted out of the
IOMMU_SUPPORT block somehow. I guess just move it into the top of
drivers/iommu/Kconfig?

Jason