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Message-ID: <YwQae9yhJyjAQ5Xy@araj-dh-work>
Date: Tue, 23 Aug 2022 00:08:27 +0000
From: Ashok Raj <ashok.raj@...el.com>
To: Borislav Petkov <bp@...en8.de>
CC: Thomas Gleixner <tglx@...utronix.de>,
Tony Luck <tony.luck@...el.com>,
Dave Hansen <dave.hansen@...el.com>,
LKML Mailing List <linux-kernel@...r.kernel.org>,
X86-kernel <x86@...nel.org>,
Andy Lutomirski <luto@...capital.net>,
Tom Lendacky <thomas.lendacky@....com>,
Jacon Jun Pan <jacob.jun.pan@...el.com>,
Ashok Raj <ashok.raj@...el.com>
Subject: Re: [PATCH v3 2/5] x86/microcode/intel: Allow a late-load only if a
min rev is specified
Hi Boris
> > struct microcode_intel {
> > diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
> > index c4b11e2fbe33..1eb202ec2302 100644
> > --- a/arch/x86/kernel/cpu/microcode/intel.c
> > +++ b/arch/x86/kernel/cpu/microcode/intel.c
> > @@ -178,6 +178,7 @@ static int microcode_sanity_check(void *mc, int print_err)
>
> You can't do this in this function:
>
> load_ucode_intel_bsp -> __load_ucode_intel -> scan_microcode -> microcode_sanity_check
>
> which is the early path.
Correct, but print_err parameter is 0 when called from scan_microcode() and 1
when called from generic_load_microcode().
We do min_rev enforcement only when print_err is set.
Should I change the parameter to "late_loading" instead so the
meaning is clear. Let me know if I that's preferred.
Cheers,
Ashok
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