linux-kernel - Re: [PATCH v2 5/7] x86/mm, tracing: Fix CR2 corruption

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Message-ID: <CAHk-=wj=vCn1c7O4rpjwnS1fZbEppkeUhAq=ob3+wox0FKNZwQ@mail.gmail.com>
Date:   Sat, 6 Jul 2019 15:41:10 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>,
        Andrew Lutomirski <luto@...nel.org>,
        Peter Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Juergen Gross <jgross@...e.com>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        He Zhe <zhe.he@...driver.com>,
        Joel Fernandes <joel@...lfernandes.org>, devel@...ukata.com
Subject: Re: [PATCH v2 5/7] x86/mm, tracing: Fix CR2 corruption

On Sat, Jul 6, 2019 at 3:27 PM Steven Rostedt <rostedt@...dmis.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