From: Marcos Del Sol Vives <marcos@orca.pet>
To: Borislav Petkov <bp@alien8.de>
Cc: "Ahmed S. Darwish" <darwi@linutronix.de>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Brian Gerst <brgerst@gmail.com>, Uros Bizjak <ubizjak@gmail.com>,
Ard Biesheuvel <ardb@kernel.org>,
David Kaplan <david.kaplan@amd.com>, Kees Cook <kees@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Oleg Nesterov <oleg@redhat.com>, "Xin Li (Intel)" <xin@zytor.com>,
Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Subject: Re: [PATCH] x86: add hintable NOPs emulation
Date: Wed, 20 Aug 2025 12:01:30 +0200 [thread overview]
Message-ID: <3db7d599-c2a7-4bec-94b1-4872649dde8d@orca.pet> (raw)
In-Reply-To: <20250820095556.GEaKWbrMh24T7jTfBg@fat_crate.local>
El 20/08/2025 a las 11:55, Borislav Petkov escribió:
> On Wed, Aug 20, 2025 at 11:51:27AM +0200, Marcos Del Sol Vives wrote:
>> I mean, they should know what they need to recompile if they want to, not
>> just that their machine is having a bug triggered by some binary.
>
> And what's stopping you from writing a proper error message explaining that?
>
> And issuing that error message *exactly once* instead of flooding dmesg for no
> good reason?
Please define "once". Once per what? Per boot? Per executable? Per process?
Once per boot would mean they'd need to reboot to see if any other executables
are affected. Per executable AFAIK there are no facilities to do that, and the
closest is per process which is what it's currently being done (again, like
IOPL emulation which was already deemed okay a couple years ago and merged
into the kernel)
next prev parent reply other threads:[~2025-08-20 10:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-20 1:34 [PATCH] x86: add hintable NOPs emulation Marcos Del Sol Vives
2025-08-20 9:07 ` Peter Zijlstra
2025-08-21 12:28 ` David Laight
2025-08-21 12:46 ` Peter Zijlstra
2025-08-21 18:40 ` David Laight
2025-08-21 19:46 ` Marcos Del Sol Vives
2025-08-21 15:11 ` Marcos Del Sol Vives
2025-08-20 9:14 ` Ahmed S. Darwish
2025-08-20 9:33 ` Marcos Del Sol Vives
2025-08-20 9:43 ` Borislav Petkov
2025-08-20 9:51 ` Marcos Del Sol Vives
2025-08-20 9:55 ` Borislav Petkov
2025-08-20 10:01 ` Marcos Del Sol Vives [this message]
2025-08-20 10:08 ` Borislav Petkov
2025-08-20 10:21 ` Marcos Del Sol Vives
2025-08-20 10:30 ` Borislav Petkov
2025-08-21 2:00 ` Kees Cook
2025-08-20 10:11 ` Ahmed S. Darwish
2025-08-20 10:30 ` Ahmed S. Darwish
2025-08-21 1:43 ` H. Peter Anvin
2025-08-21 9:35 ` Marcos Del Sol Vives
2025-08-21 5:02 ` H. Peter Anvin
2025-08-21 12:26 ` David Laight
2025-08-21 12:48 ` Marcos Del Sol Vives
2025-08-21 12:48 ` Peter Zijlstra
2025-08-21 13:45 ` Marcos Del Sol Vives
2025-08-21 13:59 ` Peter Zijlstra
2025-08-22 22:12 ` H. Peter Anvin
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