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From: Ashok Raj <ashok.raj@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Borislav Petkov <bp@alien8.de>, Tony Luck <tony.luck@intel.com>,
	LKML <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Dave Hansen <dave.hansen@intel.com>,
	Alison Schofield <alison.schofield@intel.com>,
	Reinette Chatre <reinette.chatre@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Stefan Talpalaru <stefantalpalaru@yahoo.com>,
	David Woodhouse <dwmw2@infradead.org>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	Jonathan Corbet <corbet@lwn.net>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Peter Zilstra <peterz@infradead.org>,
	Andy Lutomirski <luto@kernel.org>,
	Andrew Cooper <Andrew.Cooper3@citrix.com>,
	Ashok Raj <ashok.raj@intel.com>
Subject: Re: [PATCH v1 Part2 1/5] x86/microcode: Move late load warning to the same function that taints kernel
Date: Thu, 19 Jan 2023 14:05:26 -0800	[thread overview]
Message-ID: <Y8m+pr3t84VQTQTM@a4bf019067fa.jf.intel.com> (raw)
In-Reply-To: <875yd2i4b5.ffs@tglx>

On Thu, Jan 19, 2023 at 10:48:30PM +0100, Thomas Gleixner wrote:
> On Fri, Jan 13 2023 at 09:29, Ashok Raj wrote:
> > Currently the warning about late loading and tainting are issued from two
> > different functions.
> >
> > Later patches will re-enable microcode late-loading.
> >
> > Having both messages in the same function helps issuing warnings only
> > when required.
> >
> > Move the warning from microcode_reload_late() -> reload_store() where the
> > kernel tainting also happens.
> >
> > No functional change.
> 
> I had to read this more than once to make sense of it. Let me try a
> translation:
> 
>   Late microcode loading issues a warning and taints the
>   kernel. Tainting the kernel and emitting the warning happens in two
>   different functions.
> 
>   The upcoming support for safe late loading under certain conditions
>   needs to prevent both the warning and the tainting when the safe
>   conditions are met. That would require to hand the result of the safe
>   condition check into the function which emits the warning.
> 
>   To avoid this awkward construct, move the warning into reload_store()
>   next to the taint() invocation as that is also the function which will
>   later contain the safe condition check.
> 
>   No functional change.
> 
> Did my decoder get that right?
> 

Yes, that is accurate.. inspite of my awkward phrasing :-(

I should copy this commit verbatim before i resend :-)

Cheers,
Ashok

  reply	other threads:[~2023-01-19 22:22 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-13 17:29 [PATCH v1 Part2 0/5] Declare safe late loadable microcode Ashok Raj
2023-01-13 17:29 ` [PATCH v1 Part2 1/5] x86/microcode: Move late load warning to the same function that taints kernel Ashok Raj
2023-01-19 21:48   ` Thomas Gleixner
2023-01-19 22:05     ` Ashok Raj [this message]
2023-01-13 17:29 ` [PATCH v1 Part2 2/5] x86/microcode/intel: Add minimum required revision to microcode header Ashok Raj
2023-01-19 22:03   ` Thomas Gleixner
2023-01-19 22:34     ` Ashok Raj
2023-01-13 17:29 ` [PATCH v1 Part2 3/5] x86/microcode: Add a generic mechanism to declare support for minrev Ashok Raj
2023-01-20  0:15   ` Thomas Gleixner
2023-01-20  2:19     ` Ashok Raj
2023-01-21 21:35     ` [Part 2 v2[cleanup] 0/4] Some additional cleanups in microcode Ashok Raj
2023-01-21 21:35       ` [Part 2 v2[cleanup] 1/4] x86/microcode: Taint kernel only if microcode loading was successful Ashok Raj
2023-01-21 21:35       ` [Part 2 v2[cleanup] 2/4] x86/microcode: Report invalid writes to reload sysfs file Ashok Raj
2023-01-21 21:35       ` [Part 2 v2[cleanup] 3/4] x86/microcode/intel: Fix collect_cpu_info() to reflect current microcode Ashok Raj
2023-01-21 21:35       ` [Part 2 v2[cleanup] 4/4] x86/microcode: Do not call apply_microde() on sibling threads Ashok Raj
2023-01-22  3:36         ` Ashok Raj
2023-01-26 16:52       ` [Part 2 v2[cleanup] 0/4] Some additional cleanups in microcode Ashok Raj
2023-01-27 13:49         ` Borislav Petkov
2023-01-13 17:29 ` [PATCH v1 Part2 4/5] x86/microcode/intel: Drop wbinvd() from microcode loading Ashok Raj
2023-01-13 17:29 ` [PATCH v1 Part2 5/5] x86/microcode: Provide an option to override minrev enforcement Ashok Raj

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