linux-kernel - Re: [PATCH 0/5] mlx5 ConnectX diagnostic misc driver

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Message-ID: <2023101858-underwire-donated-3ae9@gregkh>
Date:   Wed, 18 Oct 2023 10:31:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
        Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>, Jiri Pirko <jiri@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH 0/5] mlx5 ConnectX diagnostic misc driver

On Wed, Oct 18, 2023 at 01:19:36AM -0700, Saeed Mahameed wrote:
> Historically a userspace program was used that accessed the PCI register
> and config space directly through /sys/bus/pci/.../XXX and could operate
> these debugging interfaces in parallel with the running driver.
> This approach is incompatible with secure boot and kernel lockdown so this
> driver provides a secure and restricted interface to that.

Why not just write a UIO driver for this hardware then?

thanks,

greg k-h