linux-kernel - Re: [PATCH] x86/hpet: Read HPET directly if panic in progress

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Message-ID: <20240605113323.GFZmBNA7ec2s191_2w@fat_crate.local>
Date: Wed, 5 Jun 2024 13:33:23 +0200
From: Borislav Petkov <bp@...en8.de>
To: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>, mingo@...hat.com,
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
	keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com,
	mat.jonczyk@...pl, rdunlap@...radead.org,
	alexandre.belloni@...tlin.com, mario.limonciello@....com,
	yaolu@...inos.cn, bhelgaas@...gle.com, justinstitt@...gle.com,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	CobeChen@...oxin.com, TimGuo@...oxin.com, LeoLiu-oc@...oxin.com
Subject: Re: [PATCH] x86/hpet: Read HPET directly if panic in progress

On Wed, Jun 05, 2024 at 06:10:07PM +0800, Tony W Wang-oc wrote:
> It may also happen without setting fake_panic, such as an MCE error of the
> UCNA/SRAO type occurred?

Which types exactly do you mean when you're looking at the severities[]
array in severity.c?

And what scenario are you talking about?

To get an #MC exception and detect only UCNA/SRAO errors? Can that even
happen on any hardware?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette