linux-kernel - Re: [PATCH v14 09/19] x86: Secure Launch kernel early boot stub

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Message-ID: <07132e5a-d334-43b6-8905-4e1ca991b3fa@intel.com>
Date: Mon, 21 Apr 2025 18:18:47 -0700
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,
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 baolu.lu@...ux.intel.com, kanth.ghatraju@...cle.com,
 andrew.cooper3@...rix.com, trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v14 09/19] x86: Secure Launch kernel early boot stub

On 4/21/25 09:27, Ross Philipson wrote:
> +static u64 sl_rdmsr(u32 reg)
> +{
> +	u64 lo, hi;
> +
> +	asm volatile ("rdmsr" : "=a" (lo), "=d" (hi) : "c" (reg));
> +
> +	return (hi << 32) | lo;
> +}

Is there a reason this code doesn't just use boot_rdmsr()?