linux-kernel - Re: [patch V2 03/37] x86/microcode/intel: Move microcode functions out of cpu/intel.c

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Date:   Wed, 23 Aug 2023 20:51:44 +0800
From:   Qiuxu Zhuo <qiuxu.zhuo@...el.com>
To:     tglx@...utronix.de
Cc:     arjan@...ux.intel.com, ashok.raj@...el.com, bp@...en8.de,
        linux-kernel@...r.kernel.org, nik.borisov@...e.com, x86@...nel.org,
        qiuxu.zhuo@...el.com
Subject: Re: [patch V2 03/37] x86/microcode/intel: Move microcode functions out of cpu/intel.c

Hi Thomas,

> ...
> -#define get_totalsize(mc) \
> -	(((struct microcode_intel *)mc)->hdr.datasize ? \
> -	 ((struct microcode_intel *)mc)->hdr.totalsize : \
> -	 DEFAULT_UCODE_TOTALSIZE)
> +#define DEFAULT_UCODE_DATASIZE		(2000)
>  
> ...
> +
> +static inline unsigned int get_totalsize(struct microcode_header_intel *hdr)
> +{
> +	return hdr->datasize ? : DEFAULT_UCODE_TOTALSIZE;

I tested this patch series and observed that the inline code above failed
the late microcode loading with the error message:

    [  117.100299] microcode: Error: bad microcode data file size.

According to the original get_totalsize() macro, seems like it should be:

    return hdr->datasize ? hdr->totalsize : DEFAULT_UCODE_TOTALSIZE;

With this minor change, the late microcode loading was successful, and the
expected message was displayed:

    ...
    [  150.198654] microcode: Microcode revision: 0x80000400 -> 0x80000401

-Qiuxu

> +}
> ...