From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Peter Zijlstra <peterz@infradead.org>,
Nicolai Stange <nstange@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"the arch/x86 maintainers" <x86@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
Shuah Khan <shuah@kernel.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Tim Chen <tim.c.chen@linux.intel.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Mimi Zohar <zohar@linux.ibm.com>, Juergen Gross <jgross@suse.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Nayna Jain <nayna@linux.ibm.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Joerg Roedel <jroedel@suse.de>,
Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
live-patching@vger.kernel.org,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>
Subject: Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation
Date: Mon, 29 Apr 2019 13:07:33 -0700 [thread overview]
Message-ID: <CAHk-=wg1QPz0m+7jnVcjQgkySUQLzAXE8_PZARV-vWYK27LB=w@mail.gmail.com> (raw)
In-Reply-To: <CALCETrXzVU0Q7u1q=QFPaDr=aojjF5cjbOi9CxxXnp5GqTqsWA@mail.gmail.com>
On Mon, Apr 29, 2019 at 12:24 PM Andy Lutomirski <luto@kernel.org> wrote:
> > Side note: we *already* depend on sti shadow working in other parts of the kernel, namely sti->iret.
>
> Where? STI; IRET would be nuts.
Sorry, not 'sti;iret' but 'sti;sysexit'
> before commit 4214a16b02971c60960afd675d03544e109e0d75
> x86/asm/entry/64/compat: Use SYSRETL to return from compat mode SYSENTER
>
> we did sti; sysxit, but, when we discussed this, I don't recall anyone
> speaking up in favor of the safely of the old code.
We still have that sti sysexit in the 32-bit code.
Linus
next prev parent reply other threads:[~2019-04-29 20:14 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-27 10:06 [PATCH 0/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation Nicolai Stange
2019-04-27 10:06 ` [PATCH 1/4] x86/thread_info: introduce ->ftrace_int3_stack member Nicolai Stange
2019-04-28 17:41 ` Andy Lutomirski
2019-04-28 17:51 ` Steven Rostedt
2019-04-28 18:08 ` Andy Lutomirski
2019-04-28 19:43 ` Steven Rostedt
2019-04-28 20:56 ` Andy Lutomirski
2019-04-28 21:22 ` Nicolai Stange
2019-04-28 23:27 ` Andy Lutomirski
2019-04-27 10:06 ` [PATCH 2/4] ftrace: drop 'static' qualifier from ftrace_ops_list_func() Nicolai Stange
2019-04-27 10:06 ` [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation Nicolai Stange
2019-04-27 10:26 ` Peter Zijlstra
2019-04-28 17:38 ` Steven Rostedt
2019-04-29 18:06 ` Linus Torvalds
2019-04-29 18:22 ` Linus Torvalds
2019-04-29 18:42 ` Andy Lutomirski
[not found] ` <CAHk-=whtt4K2f0KPtG-4Pykh3FK8UBOjD8jhXCUKB5nWDj_YRA@mail.gmail.com>
2019-04-29 18:56 ` Andy Lutomirski
[not found] ` <CAHk-=wgewK4eFhF3=0RNtk1KQjMANFH6oDE=8m=84RExn2gxhw@mail.gmail.com>
[not found] ` <CAHk-=whay7eN6+2gZjY-ybRbkbcqAmgrLwwszzHx8ws3c=S-MA@mail.gmail.com>
2019-04-29 19:24 ` Andy Lutomirski
2019-04-29 20:07 ` Linus Torvalds [this message]
2019-04-30 13:56 ` Peter Zijlstra
2019-04-30 16:06 ` Linus Torvalds
2019-04-30 16:33 ` Andy Lutomirski
2019-04-30 17:03 ` Steven Rostedt
2019-04-30 17:20 ` Steven Rostedt
2019-04-30 17:49 ` [RFC][PATCH] ftrace/x86: Emulate call function while updating in breakpoint handler Steven Rostedt
2019-04-30 18:33 ` Linus Torvalds
2019-04-30 19:00 ` Steven Rostedt
2019-04-30 21:08 ` Steven Rostedt
2019-05-01 13:11 ` Peter Zijlstra
2019-05-01 18:58 ` Steven Rostedt
2019-05-01 19:03 ` Peter Zijlstra
2019-05-01 19:03 ` Linus Torvalds
2019-05-01 19:13 ` Peter Zijlstra
2019-05-01 19:13 ` Steven Rostedt
2019-05-01 19:33 ` Jiri Kosina
2019-05-01 19:41 ` Peter Zijlstra
2019-04-30 21:53 ` [RFC][PATCH v2] " Steven Rostedt
2019-05-01 1:35 ` Steven Rostedt
2019-05-01 1:58 ` Linus Torvalds
2019-05-01 8:26 ` Nicolai Stange
2019-05-01 13:22 ` Steven Rostedt
2019-04-29 20:16 ` [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation Linus Torvalds
2019-04-29 22:08 ` Sean Christopherson
2019-04-29 22:22 ` Linus Torvalds
2019-04-30 0:08 ` Sean Christopherson
2019-04-30 0:45 ` Sean Christopherson
2019-04-30 2:26 ` Linus Torvalds
2019-04-30 10:40 ` Peter Zijlstra
2019-04-30 11:17 ` Jiri Kosina
2019-04-29 22:06 ` Linus Torvalds
2019-04-30 11:18 ` Peter Zijlstra
2019-04-29 18:52 ` Steven Rostedt
[not found] ` <CAHk-=wjm93jLtVxTX4HZs6K4k1Wqh3ujjmapqaYtcibVk_YnzQ@mail.gmail.com>
2019-04-29 19:07 ` Steven Rostedt
2019-04-29 20:06 ` Linus Torvalds
2019-04-29 20:20 ` Linus Torvalds
2019-04-29 20:30 ` Steven Rostedt
2019-04-29 21:38 ` Linus Torvalds
2019-04-29 22:07 ` Steven Rostedt
2019-04-30 9:24 ` Nicolai Stange
2019-04-30 10:46 ` Peter Zijlstra
2019-04-30 13:44 ` Steven Rostedt
2019-04-30 14:20 ` Peter Zijlstra
2019-04-30 14:36 ` Steven Rostedt
2019-04-27 10:06 ` [PATCH 4/4] selftests/livepatch: add "ftrace a live patched function" test Nicolai Stange
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