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From: Borislav Petkov <bp@alien8.de>
To: Chris Down <chris@chrisdown.name>
Cc: linux-kernel@vger.kernel.org, sean.j.christopherson@intel.com,
	tony.luck@intel.com, torvalds@linux-foundation.org,
	x86@kernel.org, kernel-team@fb.com
Subject: Re: [PATCH -v2.1] x86/msr: Filter MSR writes
Date: Tue, 14 Jul 2020 17:47:28 +0200	[thread overview]
Message-ID: <20200714154728.GA3101@nazgul.tnic> (raw)
In-Reply-To: <20200714121955.GA2080@chrisdown.name>

On Tue, Jul 14, 2020 at 01:19:55PM +0100, Chris Down wrote:
> That is, even with pr_err_ratelimited, we still end up logging on basically
> every single write, even though it's from the same TGID writing to the same
> MSRs, and end up becoming >80% of kmsg.
> 
> Of course, one can boot with `allow_writes=1` to avoid these messages at

Yes, use that.

From a quick scan over that "tool" you pointed me at, it pokes at some
MSRs from userspace which the kernel *also* writes to and this is
exactly what should not be allowed.

As to the "MSR hack", please describe what the issue is exactly so that
we can get the proper people involved. If anything, this needs to be
fixed in the kernel properly. If people are waiting for a year for a
BIOS fix, I'd say there's a very slim chance for that to ever happen...

Thx.

-- 
Regards/Gruss,
    Boris.

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

  reply	other threads:[~2020-07-14 15:47 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-12 10:50 [RFC PATCH] x86/msr: Filter MSR writes Borislav Petkov
2020-06-12 16:34 ` Sean Christopherson
2020-06-12 16:46   ` Borislav Petkov
2020-06-12 16:57     ` Sean Christopherson
2020-06-12 17:03       ` Borislav Petkov
2020-06-12 17:43         ` Sean Christopherson
2020-06-12 17:52           ` Borislav Petkov
2020-06-12 17:20 ` Linus Torvalds
2020-06-12 17:48   ` Borislav Petkov
2020-06-12 19:47     ` Borislav Petkov
2020-06-12 20:39     ` Peter Zijlstra
2020-06-13  5:40       ` Tony Luck
2020-06-13  9:39       ` Borislav Petkov
2020-06-13 15:48 ` [PATCH -v2] " Borislav Petkov
2020-06-15  6:38   ` [PATCH -v2.1] " Borislav Petkov
2020-06-25  5:51     ` Sean Christopherson
2020-06-25  8:37       ` Borislav Petkov
2020-07-14 12:19     ` Chris Down
2020-07-14 15:47       ` Borislav Petkov [this message]
2020-07-14 16:04         ` Chris Down
2020-07-14 16:46           ` Luck, Tony
2020-07-14 16:58             ` Borislav Petkov
2020-07-14 17:02             ` Chris Down
2020-07-14 16:56           ` Borislav Petkov
2020-07-14 17:04             ` Chris Down
2020-07-14 18:52             ` Srinivas Pandruvada
2020-07-15  4:26               ` Borislav Petkov
2020-07-14 19:17           ` Matthew Garrett
2020-11-17 21:00             ` Mathieu Chouquet-Stringer
2020-11-17 21:20               ` Borislav Petkov
2020-11-18  8:58                 ` Mathieu Chouquet-Stringer
2020-11-18  9:09                 ` Mathieu Chouquet-Stringer
2020-11-18 11:50                   ` Borislav Petkov
2020-11-18 14:04                     ` [PATCH] " Mathieu Chouquet-Stringer
2020-11-18 17:50                       ` Borislav Petkov
2020-11-19 10:53                         ` Mathieu Chouquet-Stringer
2020-11-25 21:41                           ` Mathieu Chouquet-Stringer
2020-11-26 10:03                           ` Borislav Petkov
2020-11-17 21:21               ` [PATCH -v2.1] " Matthew Garrett
2020-11-17 21:22                 ` Matthew Garrett
2020-11-18  9:02                   ` Mathieu Chouquet-Stringer
2020-06-17 15:06 ` [tip: x86/misc] " tip-bot2 for Borislav Petkov
2020-06-25  8:45 ` tip-bot2 for Borislav Petkov

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