linux-kernel - Re: [PATCH 4/4] pci: export untrusted attribute in sysfs

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Message-ID: <CACK8Z6GqEaETgVkwd_tsbRmVGLb5kuMPP7eGi54uTCXFEOXiSw@mail.gmail.com>
Date:   Thu, 18 Jun 2020 16:58:23 -0700
From:   Rajat Jain <rajatja@...gle.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, iommu@...ts.linux-foundation.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        "Krishnakumar, Lalithambika" <lalithambika.krishnakumar@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Prashant Malani <pmalani@...gle.com>,
        Benson Leung <bleung@...gle.com>,
        Todd Broch <tbroch@...gle.com>,
        Alex Levin <levinale@...gle.com>,
        Mattias Nissler <mnissler@...gle.com>,
        Rajat Jain <rajatxjain@...il.com>,
        Bernie Keany <bernie.keany@...el.com>,
        Aaron Durbin <adurbin@...gle.com>,
        Diego Rivas <diegorivas@...gle.com>,
        Duncan Laurie <dlaurie@...gle.com>,
        Furquan Shaikh <furquan@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Christian Kellner <christian@...lner.me>,
        Alex Williamson <alex.williamson@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Oliver O'Halloran" <oohall@...il.com>
Subject: Re: [PATCH 4/4] pci: export untrusted attribute in sysfs

Hi Bjorn, All,

Thank you so much for your helpful review and inputs.

On Mon, Jun 15, 2020 at 6:17 PM Rajat Jain <rajatja@...gle.com> wrote:
>
> This is needed to allow the userspace to determine when an untrusted
> device has been added, and thus allowing it to bind the driver manually
> to it, if it so wishes. This is being done as part of the approach
> discussed at https://lkml.org/lkml/2020/6/9/1331
>
> Signed-off-by: Rajat Jain <rajatja@...gle.com>

Considering the suggestions obtained on this patch to move this
attribute to device core, please consider this particular patch
rescinded. I'll submit this as a separate patch since I think that
will take more bake time and more discussion, than the other patches
in this patchset.

Please consider applying the other 3 patches in this patchset though,
and I'd appreciate your review and comments.

Thanks & Best Regards,

Rajat


> ---
>  drivers/pci/pci-sysfs.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 6d78df981d41a..574e9c613ba26 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -50,6 +50,7 @@ pci_config_attr(subsystem_device, "0x%04x\n");
>  pci_config_attr(revision, "0x%02x\n");
>  pci_config_attr(class, "0x%06x\n");
>  pci_config_attr(irq, "%u\n");
> +pci_config_attr(untrusted, "%u\n");
>
>  static ssize_t broken_parity_status_show(struct device *dev,
>                                          struct device_attribute *attr,
> @@ -608,6 +609,7 @@ static struct attribute *pci_dev_attrs[] = {
>  #endif
>         &dev_attr_driver_override.attr,
>         &dev_attr_ari_enabled.attr,
> +       &dev_attr_untrusted.attr,
>         NULL,
>  };
>
> --
> 2.27.0.290.gba653c62da-goog
>