All of lore.kernel.org
 help / color / mirror / Atom feed
From: Peter Zijlstra <peterz@infradead.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Brian Gerst <brgerst@gmail.com>, Juergen Gross <jgross@suse.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Arnd Bergmann <arnd@arndb.de>
Subject: Re: [patch 13/16] x86/entry: Move irqflags and context tracking to C for simple idtentries
Date: Wed, 26 Feb 2020 17:28:11 +0100	[thread overview]
Message-ID: <20200226162811.GA18400@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CALCETrXYbmrVvYQzBDp8YP+-UyF3KPDgcK__HuNmpdsMBJYDVA@mail.gmail.com>

On Wed, Feb 26, 2020 at 07:11:39AM -0800, Andy Lutomirski wrote:

> In some sense, this is a weakness of the magic macro approach.  Some
> of the entries just want to have code that runs before all the entry
> fixups.  This is an example of it.  So are the cr2 reads.  It can all
> be made to work, but it's a bit gross.

Right. In my current pile (new patche since last posting) I also have
one that makes #DB save-clear/restore DR7.

I got it early enough that only a watchpoint on the task stack can still
screw us over, since I also included your patch that excludes
cpu_entry_area.

Pushing it earlier still would require calling into C from the entry
stack, which I know is on your todo list, but we're not quite there yet.

  reply	other threads:[~2020-02-26 16:28 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-25 22:33 [patch 00/16] x86/entry: Consolidation - Part IV Thomas Gleixner
2020-02-25 22:33 ` [patch 01/16] x86/entry: Provide IDTENTRY_IST Thomas Gleixner
2020-02-25 22:33 ` [patch 02/16] x86/entry: Convert Machine Check to IDTENTRY_IST Thomas Gleixner
2020-02-25 22:33 ` [patch 03/16] x86/idtentry: Provide IDTENTRY_XEN for XEN/PV Thomas Gleixner
2020-02-25 22:33 ` [patch 04/16] x86/entry: Convert NMI to IDTENTRY_NMI Thomas Gleixner
2020-02-25 22:33 ` [patch 05/16] x86/entry: Convert Debug exception to IDTENTRY_DB Thomas Gleixner
2020-02-25 22:33 ` [patch 06/16] x86/entry/64: Remove error code clearing from #DB and #MCE ASM stub Thomas Gleixner
2020-02-25 22:33 ` [patch 07/16] x86/entry: Provide IDTRENTRY_NOIST variants for #DB and #MC Thomas Gleixner
2020-02-25 22:33 ` [patch 08/16] x86/entry: Implement user mode C entry points for #DB and #MCE Thomas Gleixner
2020-02-25 22:33 ` [patch 09/16] x86/entry: Provide IDTENTRY_DF Thomas Gleixner
2020-02-25 22:33 ` [patch 10/16] x86/entry: Convert double fault exception to IDTENTRY_DF Thomas Gleixner
2020-02-25 22:33 ` [patch 11/16] x86/entry: Switch XEN/PV hypercall entry to IDTENTRY Thomas Gleixner
2020-02-25 22:33 ` [patch 12/16] x86/entry/64: Simplify idtentry_body Thomas Gleixner
2020-02-25 22:33 ` [patch 13/16] x86/entry: Move irqflags and context tracking to C for simple idtentries Thomas Gleixner
2020-02-26  8:05   ` Peter Zijlstra
2020-02-26  9:20     ` Peter Zijlstra
2020-02-26 15:11       ` Andy Lutomirski
2020-02-26 16:28         ` Peter Zijlstra [this message]
2020-02-26 19:15           ` Andy Lutomirski
2020-02-26 20:25             ` Thomas Gleixner
2020-02-26 17:05     ` Frederic Weisbecker
2020-02-26 17:09       ` Andy Lutomirski
2020-02-26 17:17         ` Frederic Weisbecker
2020-02-25 22:33 ` [patch 14/16] x86/entry: Provide IDTENTRY_CR2 Thomas Gleixner
2020-02-25 22:33 ` [patch 15/16] x86/entry: Switch page fault exceptions to idtentry_simple Thomas Gleixner
2020-03-05 21:51   ` Andy Lutomirski
2020-03-05 23:02     ` Thomas Gleixner
2020-02-25 22:33 ` [patch 16/16] x86/entry: Disable interrupts in IDTENTRY Thomas Gleixner
2020-02-26  9:23   ` Peter Zijlstra
2020-02-26 20:21     ` Thomas Gleixner
2020-02-27  8:41       ` Peter Zijlstra

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200226162811.GA18400@hirez.programming.kicks-ass.net \
    --to=peterz@infradead.org \
    --cc=arnd@arndb.de \
    --cc=brgerst@gmail.com \
    --cc=jgross@suse.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@amacapital.net \
    --cc=pbonzini@redhat.com \
    --cc=rostedt@goodmis.org \
    --cc=tglx@linutronix.de \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.