linux-kernel - Re: [patch 16/16] x86/entry: Disable interrupts in IDTENTRY

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Message-ID: <20200227084159.GF18400@hirez.programming.kicks-ass.net>
Date:   Thu, 27 Feb 2020 09:41:59 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 16/16] x86/entry: Disable interrupts in IDTENTRY

On Wed, Feb 26, 2020 at 09:21:11PM +0100, Thomas Gleixner wrote:
> Peter Zijlstra <peterz@...radead.org> writes:
> 
> > On Tue, Feb 25, 2020 at 11:33:37PM +0100, Thomas Gleixner wrote:
> >> Not all exceptions guarantee to return with interrupts disabled. Disable
> >> them in idtentry_exit() which is invoked on all regular (non IST) exception
> >> entry points. Preparatory patch for further consolidation of the return
> >> code.
> >
> > ISTR a patch that undoes cond_local_irq_enable() in the various trap
> > handlers. Did that get lost or is that still on the TODO list
> > somewhere?
> 
> Hmm. I ditched it after we decided that fixing the #PF cases is ugly as
> hell. Lemme find that stuff again.

Hmm, vague memories. Anyway, we can leave that for later, but maybe put
in a comment so we don't forget.