linux-kernel - Re: [PATCH v2] efi: add ovmf debug log driver

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Message-ID: <6edfa099-ab0c-41f6-89ea-0fd67666dd05@kernel.org>
Date: Wed, 9 Jul 2025 15:58:58 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Gerd Hoffmann <kraxel@...hat.com>, linux-efi@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] efi: add ovmf debug log driver

On 08/07/2025 14:56, Gerd Hoffmann wrote:
> +MODULE_DESCRIPTION("OVMF debug log");
> +MODULE_AUTHOR("Gerd Hoffmann <kraxel@...hat.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_ALIAS("platform:ovmf_debug_log");
> diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> index db8c5c03d3a2..ac0a03ec3452 100644
> --- a/drivers/firmware/efi/Kconfig
> +++ b/drivers/firmware/efi/Kconfig
> @@ -263,6 +263,14 @@ config EFI_COCO_SECRET
>  	  virt/coco/efi_secret module to access the secrets, which in turn
>  	  allows userspace programs to access the injected secrets.
>  
> +config OVMF_DEBUG_LOG
> +	tristate "Expose OVMF firmware debug log via sysfs"
> +	depends on EFI
> +	help
> +	  Recent OVMF versions (edk2-stable202508 + newer) can write
> +	  their debug log to a memory buffer.  This driver exposes the
> +	  log content via sysfs (/sys/firmware/efi/ovmf_debug_log).

Where did you document new ABI?

Best regards,
Krzysztof