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From: Linus Torvalds <torvalds@linux-foundation.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>,
	Andrew Lutomirski <luto@kernel.org>, Peter Anvin <hpa@zytor.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Juergen Gross <jgross@suse.com>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
	He Zhe <zhe.he@windriver.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	devel@etsukata.com
Subject: Re: [PATCH v2 5/7] x86/mm, tracing: Fix CR2 corruption
Date: Sat, 6 Jul 2019 15:41:10 -0700	[thread overview]
Message-ID: <CAHk-=wj=vCn1c7O4rpjwnS1fZbEppkeUhAq=ob3+wox0FKNZwQ@mail.gmail.com> (raw)
In-Reply-To: <20190706182728.435a89ed@gandalf.local.home>

On Sat, Jul 6, 2019 at 3:27 PM Steven Rostedt <rostedt@goodmis.org> wrote:
>
> We also have to deal with reading vmalloc'd data as that can fault too.

Ahh, that may be a better reason for PeterZ's patches and reading cr2
very early from asm code than the stack trace case. It's why the page
fault handler delayed enabling interrupts, after all (which is one big
reason NMI was special).

               Linus

  reply	other threads:[~2019-07-06 22:41 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-04 19:55 [PATCH v2 0/7] Tracing vs CR2 (and cleanups) Peter Zijlstra
2019-07-04 19:55 ` [PATCH v2 1/7] x86/paravirt: Make read_cr2() CALLEE_SAVE Peter Zijlstra
2019-07-04 21:49   ` Andy Lutomirski
2019-07-10 19:53   ` Steven Rostedt
2019-07-04 19:55 ` [PATCH v2 2/7] x86/entry/32: Simplify common_exception Peter Zijlstra
2019-07-04 21:51   ` Andy Lutomirski
2019-07-10 20:11   ` Steven Rostedt
2019-07-10 20:14     ` Peter Zijlstra
2019-07-04 19:55 ` [PATCH v2 3/7] x86/entry/64: Simplify idtentry a little Peter Zijlstra
2019-07-04 21:54   ` Andy Lutomirski
2019-07-10 20:23   ` Steven Rostedt
2019-07-04 19:55 ` [PATCH v2 4/7] x86/entry/64: Update comments and sanity tests for create_gap Peter Zijlstra
2019-07-04 21:55   ` Andy Lutomirski
2019-07-10 20:24   ` Steven Rostedt
2019-07-04 19:56 ` [PATCH v2 5/7] x86/mm, tracing: Fix CR2 corruption Peter Zijlstra
2019-07-05  2:18   ` Linus Torvalds
2019-07-05  3:16     ` Andy Lutomirski
2019-07-05  3:27       ` Linus Torvalds
2019-07-05 13:49     ` Peter Zijlstra
2019-07-06 21:41       ` Linus Torvalds
2019-07-06 22:27         ` Steven Rostedt
2019-07-06 22:41           ` Linus Torvalds [this message]
2019-07-07  0:08             ` Linus Torvalds
2019-07-07  0:36               ` Andy Lutomirski
2019-07-06 23:50           ` Andy Lutomirski
2019-07-07  3:44           ` Eiichi Tsukata
2019-07-06 11:07     ` Eiichi Tsukata
2019-07-08  7:48       ` Peter Zijlstra
2019-07-08  8:58         ` Eiichi Tsukata
2019-07-08  9:42           ` Eiichi Tsukata
2019-07-09  5:17             ` Eiichi Tsukata
2019-07-07 15:10   ` Andy Lutomirski
2019-07-07 15:11     ` Andy Lutomirski
2019-07-07 18:17       ` Linus Torvalds
2019-07-10 20:27         ` Steven Rostedt
2019-07-11  6:45           ` Greg Kroah-Hartman
2019-07-11 12:12           ` Sasha Levin
2019-07-11 12:21           ` Peter Zijlstra
2019-07-04 19:56 ` [PATCH v2 6/7] x86/entry/64: Remove TRACE_IRQS_*_DEBUG Peter Zijlstra
2019-07-11  3:24   ` Steven Rostedt
2019-07-11  8:05     ` Peter Zijlstra
2019-07-04 19:56 ` [RFC][PATCH v2 7/7] x86/entry/64: Pull bits into C Peter Zijlstra

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