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Date:   Fri, 22 Mar 2019 06:54:27 +0100
From:   Juergen Gross <>
To:     Linus Torvalds <>,
        Andy Lutomirski <>
Cc:     Peter Zijlstra <>,
        Steven Rostedt <>,
        LKML <>,
        "H. Peter Anvin" <>,
        Thomas Gleixner <>,
        Ingo Molnar <>, Borislav Petkov <>,
        Joel Fernandes <>,
        He Zhe <>
Subject: Re: [RFC][PATCH] tracing/x86: Save CR2 before tracing irqsoff on

On 21/03/2019 19:18, Linus Torvalds wrote:
> On Thu, Mar 21, 2019 at 11:05 AM Andy Lutomirski <> wrote:
>> In the long run, I think the right solution is to rewrite even more of
>> this mess in C.  We really ought to be able to put the IRQ flag
>> tracing and the context tracking into C code.
> Tangentially about this long run thing - can we start discussing just
> dropping PV mode entirely in the long run? Or even not-so-long run?

As Andrew already said: the work is ongoing, but hard.

What I'm planning to do, however, is dropping 32-bit PV code from the
kernel not too far in the future. This is only a small step, but it is
a move in the right direction.


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