linux-kernel - Re: [PATCH v7 1/4] efi: Introduce EFI_FIRMWARE_MANAGEMENT_CAPSULE

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Message-ID: <20211101110144.GA28054@chenyu5-mobl1>
Date:   Mon, 1 Nov 2021 19:01:44 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     linux-acpi@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>, Len Brown <lenb@...nel.org>,
        Ashok Raj <ashok.raj@...el.com>,
        Mike Rapoport <rppt@...nel.org>,
        Aubrey Li <aubrey.li@...el.com>, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org
Subject: Re: [PATCH v7 1/4] efi: Introduce
 EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER and corresponding structures

On Wed, Oct 27, 2021 at 01:00:43PM +0300, Andy Shevchenko wrote:
> On Wed, Oct 27, 2021 at 03:07:24PM +0800, Chen Yu wrote:
> > Platform Firmware Runtime Update image starts with UEFI headers, and the
> > headers are defined in UEFI specification, but some of them have not been
> > defined in the kernel yet.
> > 
> > For example, the header layout of a capsule file looks like this:
> > 
> > EFI_CAPSULE_HEADER
> > EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER
> > EFI_FIRMWARE_MANAGEMENT_CAPSULE_IMAGE_HEADER
> > EFI_FIRMWARE_IMAGE_AUTHENTICATION
> > 
> > These structures would be used by the Platform Firmware Runtime Update
> > driver to parse the format of capsule file to verify if the corresponding
> > version number is valid. The EFI_CAPSULE_HEADER has been defined in the
> > kernel, however the rest are not, thus introduce corresponding UEFI
> > structures accordingly. Besides, EFI_FIRMWARE_MANAGEMENT_CAPSULE_HEADER
> > and EFI_FIRMWARE_MANAGEMENT_CAPSULE_IMAGE_HEADER are required to be packed
> > in the uefi specification. And Ard has pointed out that, the __packed
> > attribute does indicate to the compiler that the entire thing can appear
> > misaligned in memory. So if one follows the other in the capsule header,
> > the __packed attribute may be appropriate to ensure that the second one
> > is not accessed using misaligned loads and stores.
> 
> ...
> 
> > +/* EFI_FIRMWARE_MANAGEMENT_CAPSULE_IMAGE_HEADER */
> > +struct efi_manage_capsule_image_header {
> > +	u32	ver;
> 
> > +	guid_t	image_type_id;
> 
> Shouldn't it be efi_guid_t ?
>
I see, will change it, also in other patches.

thanks,
Chenyu