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From: Yazen Ghannam <yazen.ghannam@amd.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "Luck, Tony" <tony.luck@intel.com>,
	Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-edac@vger.kernel.org" <linux-edac@vger.kernel.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	James Morse <james.morse@arm.com>,
	Robert Richter <rric@kernel.org>
Subject: Re: [PATCH] EDAC/mce_amd: Reduce unnecessary spew in dmesg if SMCA feature bit is not exposed
Date: Tue, 15 Jun 2021 12:32:21 -0400	[thread overview]
Message-ID: <20210615163221.GA2991@aus-x-yghannam.amd.com> (raw)
In-Reply-To: <YMjRGFiqp2HNWUrZ@zn.tnic>

On Tue, Jun 15, 2021 at 06:11:04PM +0200, Borislav Petkov wrote:
> On Tue, Jun 15, 2021 at 12:00:09PM -0400, Yazen Ghannam wrote:
> > So I think we can downgrade this warning to a debug message, if the
> > module stays builtin. And/or we change the default config option to
> > module, and we make sure the module only autoloads in the proper cases.
> > 
> > What do you think?
> 
> I think, as I said before, that we should simply not load this in
> guests. Then this will be taken care of once and for all and we can do
> whatever we want on baremetal, as to what error message to issue and how
> many times to issue it, whether the decoder is builtin or default y or
> yadda yadda.
> 
> Because even if you say in a guest:
> 
> 	pr_warn_once("Decoding supported only on Scalable MCA processors.\n");
> 
> you're kinda misleading because the guest might be an SMCA processor but
> not all features are emulated, including SMCA. So it is not really an
> SMCA processor but some not really existant hybrid or so.
> 
> So since this whole SMCA thing does not apply to virtualization, we
> should simply not load on virt and be done with it.
>

Yes, I agree. I was a bit confused about the X86_FEATURE_HYPERVISOR
thing, but I think I get it. This definitely looks simple to do.

Thanks,
Yazen

  reply	other threads:[~2021-06-15 16:32 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-14 21:21 Smita Koralahalli
2021-06-14 22:01 ` Borislav Petkov
2021-06-14 22:25   ` Luck, Tony
2021-06-15  9:16     ` Borislav Petkov
2021-06-15 15:08       ` Yazen Ghannam
2021-06-15 15:18         ` Borislav Petkov
2021-06-15 16:00           ` Yazen Ghannam
2021-06-15 16:11             ` Borislav Petkov
2021-06-15 16:32               ` Yazen Ghannam [this message]
2021-06-15 16:45                 ` [PATCH] EDAC/Intel: Do not load EDAC driver when running as a guest Luck, Tony
2021-06-15 17:00                   ` Borislav Petkov
2021-06-15 17:44                     ` [PATCH v2] " Luck, Tony
2021-06-15 17:25                 ` [PATCH] EDAC/mce_amd: Reduce unnecessary spew in dmesg if SMCA feature bit is not exposed Borislav Petkov

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