linux-kernel - Re: [PATCH v15 2/2] Documentation: add debugfs description for vfio

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Message-ID: <20230915150035.0311e9be.alex.williamson@redhat.com>
Date:   Fri, 15 Sep 2023 15:00:35 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     liulongfang <liulongfang@...wei.com>
Cc:     <jgg@...dia.com>, <shameerali.kolothum.thodi@...wei.com>,
        <jonathan.cameron@...wei.com>, <bcreeley@....com>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...neuler.org>
Subject: Re: [PATCH v15 2/2] Documentation: add debugfs description for vfio

On Fri, 1 Sep 2023 10:36:06 +0800
liulongfang <liulongfang@...wei.com> wrote:

> From: Longfang Liu <liulongfang@...wei.com>
> 
> 1.Add an debugfs document description file to help users understand
> how to use the accelerator live migration driver's debugfs.
> 2.Update the file paths that need to be maintained in MAINTAINERS
> 
> Signed-off-by: Longfang Liu <liulongfang@...wei.com>
> ---
>  Documentation/ABI/testing/debugfs-vfio | 25 +++++++++++++++++++++++++
>  MAINTAINERS                            |  1 +
>  2 files changed, 26 insertions(+)
>  create mode 100644 Documentation/ABI/testing/debugfs-vfio
> 
> diff --git a/Documentation/ABI/testing/debugfs-vfio b/Documentation/ABI/testing/debugfs-vfio
> new file mode 100644
> index 000000000000..086a8c52df35
> --- /dev/null
> +++ b/Documentation/ABI/testing/debugfs-vfio
> @@ -0,0 +1,25 @@
> +What:		/sys/kernel/debug/vfio
> +Date:		Aug 2023
> +KernelVersion:  6.6

This is all 6.7 material now and we might be conservative and mark it
for Oct 2023.

> +Contact:	Longfang Liu <liulongfang@...wei.com>
> +Description:	This debugfs file directory is used for debugging
> +		of vfio devices, it's a common directory for all vfio devices.
> +		Each device should create a device subdirectory under this
> +		directory by referencing the public registration interface.

The device sub-directory is already provided by the core.  Thanks,

Alex

> +
> +What:		/sys/kernel/debug/vfio/<device>/migration
> +Date:		Aug 2023
> +KernelVersion:  6.6
> +Contact:	Longfang Liu <liulongfang@...wei.com>
> +Description:	This debugfs file directory is used for debugging
> +		of vfio devices that support live migration.
> +		The debugfs of each vfio device that supports live migration
> +		could be created under this directory.
> +
> +What:		/sys/kernel/debug/vfio/<device>/migration/state
> +Date:		Aug 2023
> +KernelVersion:  6.6
> +Contact:	Longfang Liu <liulongfang@...wei.com>
> +Description:	Read the live migration status of the vfio device.
> +		The status of these live migrations includes:
> +		ERROR, RUNNING, STOP, STOP_COPY, RESUMING.
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7b1306615fc0..bd01ca674c60 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -22304,6 +22304,7 @@ L:	kvm@...r.kernel.org
>  S:	Maintained
>  T:	git https://github.com/awilliam/linux-vfio.git
>  F:	Documentation/ABI/testing/sysfs-devices-vfio-dev
> +F:	Documentation/ABI/testing/debugfs-vfio
>  F:	Documentation/driver-api/vfio.rst
>  F:	drivers/vfio/
>  F:	include/linux/vfio.h