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

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Message-ID: <bbc8126a-ec48-4b8e-a8dd-3cab7a60a6a7@oracle.com>
Date: Tue, 22 Apr 2025 12:38:51 -0700
From: ross.philipson@...cle.com
To: Dave Hansen <dave.hansen@...el.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,
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        trenchboot-devel@...glegroups.com
Subject: Re: [PATCH v14 09/19] x86: Secure Launch kernel early boot stub

On 4/21/25 6:18 PM, Dave Hansen wrote:
> 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()?

No I just didn't know those functions were there. I will fix it.

Thanks
Ross

> 
>