linux-kernel - Re: [PATCH v2] x86/mce: fix wrong no-return-ip logic in do_machine

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Message-ID: <20210222192146.76ffec84@alex-virtual-machine>
Date:   Mon, 22 Feb 2021 19:21:46 +0800
From:   Aili Yao <yaoaili@...gsoft.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     <tony.luck@...el.com>, <mingo@...hat.com>, <tglx@...utronix.de>,
        <hpa@...or.com>, <x86@...nel.org>, <linux-edac@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yangfeng1@...gsoft.com>
Subject: Re: [PATCH v2] x86/mce: fix wrong no-return-ip logic in
 do_machine_check()

On Mon, 22 Feb 2021 11:22:06 +0100
Borislav Petkov <bp@...en8.de> wrote:

> On Mon, Feb 22, 2021 at 06:08:19PM +0800, Aili Yao wrote:
> > So why would intel provide this MCG_STATUS_RIPV flag, it's better to
> > remove it as it will never be set, and all the related logic for this
> > flag is really needed ?  
> 
> Why would it never be set - of course it will be. You don't set it. If
> you wanna inject errors, then make sure you inject *valid* errors which
> the hardware *actually* generates, not some random ones.
> 

As far as I know, Most of RAS related tests are faked, not real errors, and it's really meaningful.

You should better reproduce the issue I tried to fix, or at least read the code more detailly and you will
know if it's random and invalid

Best Regards!
Aili Yao