linux-kernel - Re: [PATCH v15 16/28] x86/txt: Intel Trusted eXecution Technology (TXT) definitions

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Message-ID: <9febdd36-9c23-458a-8d7e-2bc39849e188@intel.com>
Date: Tue, 16 Dec 2025 14:14:54 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Ross Philipson <ross.philipson@...cle.com>, linux-kernel@...r.kernel.org,
 x86@...nel.org, linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-crypto@...r.kernel.org, kexec@...ts.infradead.org,
 linux-efi@...r.kernel.org, iommu@...ts.linux.dev
Cc: dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
 bp@...en8.de, hpa@...or.com, dave.hansen@...ux.intel.com, ardb@...nel.org,
 mjg59@...f.ucam.org, James.Bottomley@...senpartnership.com,
 peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca, luto@...capital.net,
 nivedita@...m.mit.edu, herbert@...dor.apana.org.au, davem@...emloft.net,
 corbet@....net, ebiederm@...ssion.com, dwmw2@...radead.org,
 baolu.lu@...ux.intel.com, kanth.ghatraju@...cle.com,
 andrew.cooper3@...rix.com, trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v15 16/28] x86/txt: Intel Trusted eXecution Technology
 (TXT) definitions

On 12/15/25 15:33, Ross Philipson wrote:
> +static inline struct txt_heap_event_log_pointer2_1_element*
> +txt_find_log2_1_element(struct txt_os_sinit_data *os_sinit_data)
> +{
> +	struct txt_heap_ext_data_element *ext_elem;
> +
> +	/* The extended element array is at the end of this table */
> +	ext_elem = (struct txt_heap_ext_data_element *)
> +		((u8 *)os_sinit_data + sizeof(struct txt_os_sinit_data));

I'd really honestly see a helper for this kind of thing:

#define ptr_after(foo)	((void *)foo + sizeof(foo))

resulting in:

	ext_elem = ptr_after(os_sinit_data);

would be a billion times easier to read than what's there. I honestly
don't even see why this bothers with the u8 and cast to 'struct
txt_heap_ext_data_element *' versus just using void* and being done with it.

There's no type safety here in the first place so why bother?

> +	while (ext_elem->type != TXT_HEAP_EXTDATA_TYPE_END) {
> +		if (ext_elem->type == TXT_HEAP_EXTDATA_TYPE_EVENT_LOG_POINTER2_1) {
> +			return (struct txt_heap_event_log_pointer2_1_element *)
> +				((u8 *)ext_elem + sizeof(struct txt_heap_ext_data_element));
> +		}
> +		ext_elem = (struct txt_heap_ext_data_element *)
> +			    ((u8 *)ext_elem + ext_elem->size);
> +	}