linux-kernel - Re: [PATCH v15 22/28] x86: Secure Launch kernel early boot stub

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Message-ID: <5c4734af-d72c-4b1d-9d2f-8c07d4c0dd6d@intel.com>
Date: Tue, 16 Dec 2025 14:32:30 -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 22/28] x86: Secure Launch kernel early boot stub

On 12/15/25 15:33, Ross Philipson wrote:
> +static u64 sl_txt_read(u32 reg)
> +{
> +	return readq((void *)(u64)(TXT_PRIV_CONFIG_REGS_BASE + reg));
> +}
> +
> +static void sl_txt_write(u32 reg, u64 val)
> +{
> +	writeq(val, (void *)(u64)(TXT_PRIV_CONFIG_REGS_BASE + reg));
> +}

Man, that's a lot of casting. If TXT_PRIV_CONFIG_REGS_BASE were just a
pointer to being with, it could be:

	writeq(val, TXT_PRIV_CONFIG_REGS_BASE + reg);

Right?

This _looks_ like it was just written and then had casts added to it
until it compiled.