From: Josh Poimboeuf <jpoimboe@kernel.org>
To: Borislav Petkov <bp@alien8.de>
Cc: "KP Singh" <kpsingh@kernel.org>,
linux-kernel@vger.kernel.org, pjt@google.com, evn@google.com,
tglx@linutronix.de, mingo@redhat.com,
dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
peterz@infradead.org, pawan.kumar.gupta@linux.intel.com,
kim.phillips@amd.com, alexandre.chartre@oracle.com,
daniel.sneddon@linux.intel.com,
"José Oliveira" <joseloliveira11@gmail.com>,
"Rodrigo Branco" <rodrigo@kernelhacking.com>,
"Alexandra Sandulescu" <aesa@google.com>,
"Jim Mattson" <jmattson@google.com>,
stable@vger.kernel.org
Subject: Re: [PATCH RESEND] x86/speculation: Fix user-mode spectre-v2 protection with KERNEL_IBRS
Date: Mon, 20 Feb 2023 09:59:29 -0800 [thread overview]
Message-ID: <20230220175929.2laflfb2met6y3kc@treble> (raw)
In-Reply-To: <Y/Ox3MJZF1Yb7b6y@zn.tnic>
On Mon, Feb 20, 2023 at 06:46:04PM +0100, Borislav Petkov wrote:
> On Mon, Feb 20, 2023 at 08:34:42AM -0800, Josh Poimboeuf wrote:
> > We will never enable IBRS in user space. We tried that years ago and it
> > was very slow.
>
> Then I don't know what this is trying to fix.
>
> We'd need a proper bug statement in the commit message what the problem
> is. As folks have established, the hw vuln mess is a whole universe of
> crazy. So without proper documenting, this spaghetti madness will be
> completely unreadable.
Agreed, and there seems to be a lot of confusion around this patch. I
think I understand the issue, let me write up a new patch which is
hopefully clearer.
--
Josh
next prev parent reply other threads:[~2023-02-20 17:59 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-20 12:01 [PATCH RESEND] x86/speculation: Fix user-mode spectre-v2 protection with KERNEL_IBRS KP Singh
2023-02-20 12:13 ` Josh Poimboeuf
2023-02-20 12:20 ` KP Singh
2023-02-20 12:34 ` KP Singh
2023-02-20 14:31 ` Borislav Petkov
2023-02-20 15:38 ` Dave Hansen
2023-02-20 19:57 ` Andrew Cooper
2023-02-20 21:10 ` Borislav Petkov
2023-02-20 23:01 ` KP Singh
2023-02-20 23:30 ` Andrew Cooper
2023-02-20 23:45 ` KP Singh
2023-02-21 18:52 ` KP Singh
2023-02-21 10:59 ` Borislav Petkov
2023-02-20 16:34 ` Josh Poimboeuf
2023-02-20 17:46 ` Borislav Petkov
2023-02-20 17:59 ` Josh Poimboeuf [this message]
2023-02-20 18:01 ` KP Singh
2023-02-20 18:22 ` Borislav Petkov
2023-02-20 18:44 ` KP Singh
2023-02-20 18:51 ` Borislav Petkov
2023-02-20 18:56 ` KP Singh
2023-02-20 19:02 ` Borislav Petkov
2023-02-20 19:10 ` KP Singh
2023-02-20 18:27 ` [PATCH] x86/bugs: Allow STIBP with IBRS Josh Poimboeuf
2023-02-20 18:28 ` kernel test robot
2023-02-20 18:33 ` KP Singh
2023-02-20 18:59 ` Josh Poimboeuf
2023-02-20 19:04 ` KP Singh
2023-02-20 19:19 ` Josh Poimboeuf
2023-02-20 18:34 ` Borislav Petkov
2023-02-20 19:09 ` Josh Poimboeuf
2023-02-20 19:16 ` KP Singh
2023-02-20 19:35 ` Josh Poimboeuf
2023-02-20 19:38 ` KP Singh
2023-02-20 19:20 ` Borislav Petkov
2023-02-22 1:20 ` Pawan Gupta
2023-02-22 1:26 ` KP Singh
2023-02-22 1:38 ` Pawan Gupta
2023-02-27 19:59 ` [tip: x86/urgent] x86/speculation: Allow enabling STIBP with legacy IBRS tip-bot2 for KP Singh
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230220175929.2laflfb2met6y3kc@treble \
--to=jpoimboe@kernel.org \
--cc=aesa@google.com \
--cc=alexandre.chartre@oracle.com \
--cc=bp@alien8.de \
--cc=daniel.sneddon@linux.intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=evn@google.com \
--cc=hpa@zytor.com \
--cc=jmattson@google.com \
--cc=joseloliveira11@gmail.com \
--cc=kim.phillips@amd.com \
--cc=kpsingh@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=pawan.kumar.gupta@linux.intel.com \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=rodrigo@kernelhacking.com \
--cc=stable@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.