From: Andy Lutomirski <luto@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
Stephen Hemminger <stephen@networkplumber.org>,
Willy Tarreau <w@1wt.eu>, Juergen Gross <jgross@suse.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [patch 2/9] x86/process: Unify copy_thread_tls()
Date: Sun, 10 Nov 2019 08:56:50 -0800 [thread overview]
Message-ID: <CALCETrXqP2SfhM83diqS9xr+Zso8rhsfmF8G-DQBBHAY3UU0dw@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.21.1911101332490.12583@nanos.tec.linutronix.de>
On Sun, Nov 10, 2019 at 4:36 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> On Sat, 9 Nov 2019, Thomas Gleixner wrote:
> > On Fri, 8 Nov 2019, Andy Lutomirski wrote:
> > > On 11/6/19 11:35 AM, Thomas Gleixner wrote:
> > > > +static inline int copy_io_bitmap(struct task_struct *tsk)
> > > > +{
> > > > + if (likely(!test_tsk_thread_flag(current, TIF_IO_BITMAP)))
> > > > + return 0;
> > > > +
> > > > + tsk->thread.io_bitmap_ptr = kmemdup(current->thread.io_bitmap_ptr,
> > > > + IO_BITMAP_BYTES, GFP_KERNEL);
> > >
> > > tsk->thread.io_bitmap_max = current->thread.io_bitmap_max?
> > >
> > > I realize you inherited this from the code you're refactoring, but it
> > > does seem to be missing.
> >
> > It already got copied with the task struct :)
> >
> > > > +#ifdef CONFIG_X86_64
> > > > + savesegment(gs, p->thread.gsindex);
> > > > + p->thread.gsbase = p->thread.gsindex ? 0 : current->thread.gsbase;
> > > > + savesegment(fs, p->thread.fsindex);
> > > > + p->thread.fsbase = p->thread.fsindex ? 0 : current->thread.fsbase;
> > > > + savesegment(es, p->thread.es);
> > > > + savesegment(ds, p->thread.ds);
> > > > +#else
> > > > + /* Clear all status flags including IF and set fixed bit. */
> > > > + frame->flags = X86_EFLAGS_FIXED;
> > > > +#endif
> > >
> > > Want to do another commit to make the eflags fixup unconditional? I'm
> > > wondering if we have a bug.
> >
> > Let me look at that.
>
> 64bit does not have flags in the inactive_task_frame ...
>
Hmm. One more thing to unify, I guess.
--Andy
next prev parent reply other threads:[~2019-11-10 16:57 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-06 19:34 [patch 0/9] x86/iopl: Prevent user space from using CLI/STI with iopl(3) Thomas Gleixner
2019-11-06 19:35 ` [patch 1/9] x86/ptrace: Prevent truncation of bitmap size Thomas Gleixner
2019-11-07 7:31 ` Ingo Molnar
2019-11-06 19:35 ` [patch 2/9] x86/process: Unify copy_thread_tls() Thomas Gleixner
2019-11-08 22:31 ` Andy Lutomirski
2019-11-08 23:43 ` Thomas Gleixner
2019-11-10 12:36 ` Thomas Gleixner
2019-11-10 16:56 ` Andy Lutomirski [this message]
2019-11-11 8:52 ` Peter Zijlstra
2019-11-06 19:35 ` [patch 3/9] x86/cpu: Unify cpu_init() Thomas Gleixner
2019-11-08 22:34 ` Andy Lutomirski
2019-11-06 19:35 ` [patch 4/9] x86/io: Speedup schedule out of I/O bitmap user Thomas Gleixner
2019-11-07 9:12 ` Peter Zijlstra
2019-11-07 14:04 ` Thomas Gleixner
2019-11-07 14:08 ` Thomas Gleixner
2019-11-08 22:41 ` Andy Lutomirski
2019-11-08 23:45 ` Thomas Gleixner
2019-11-09 3:32 ` Andy Lutomirski
2019-11-10 12:43 ` Thomas Gleixner
2019-11-09 0:24 ` Andy Lutomirski
2019-11-06 19:35 ` [patch 5/9] x86/ioport: Reduce ioperm impact for sane usage further Thomas Gleixner
2019-11-07 1:11 ` Linus Torvalds
2019-11-07 7:44 ` Thomas Gleixner
2019-11-07 8:25 ` Ingo Molnar
2019-11-07 9:17 ` Willy Tarreau
2019-11-07 10:00 ` Thomas Gleixner
2019-11-07 10:13 ` Willy Tarreau
2019-11-07 10:19 ` hpa
2019-11-07 10:27 ` Willy Tarreau
2019-11-07 10:50 ` hpa
2019-11-07 12:56 ` Willy Tarreau
2019-11-07 16:45 ` Eric W. Biederman
2019-11-07 16:53 ` Linus Torvalds
2019-11-07 16:57 ` Willy Tarreau
2019-11-10 17:17 ` Andy Lutomirski
2019-11-07 7:37 ` Ingo Molnar
2019-11-07 7:45 ` Thomas Gleixner
2019-11-07 8:16 ` Ingo Molnar
2019-11-07 18:02 ` Thomas Gleixner
2019-11-07 19:24 ` Brian Gerst
2019-11-07 19:54 ` Linus Torvalds
2019-11-07 21:00 ` Brian Gerst
2019-11-07 21:32 ` Thomas Gleixner
2019-11-07 23:20 ` hpa
2019-11-07 21:44 ` Linus Torvalds
2019-11-08 1:12 ` H. Peter Anvin
2019-11-08 2:12 ` Brian Gerst
2019-11-10 17:21 ` Andy Lutomirski
2019-11-06 19:35 ` [patch 6/9] x86/iopl: Fixup misleading comment Thomas Gleixner
2019-11-06 19:35 ` [patch 7/9] x86/iopl: Restrict iopl() permission scope Thomas Gleixner
2019-11-07 9:09 ` Peter Zijlstra
2019-11-10 17:26 ` Andy Lutomirski
2019-11-10 20:31 ` Thomas Gleixner
2019-11-10 21:05 ` Andy Lutomirski
2019-11-10 21:21 ` Thomas Gleixner
2019-11-06 19:35 ` [patch 8/9] x86/iopl: Remove legacy IOPL option Thomas Gleixner
2019-11-07 6:11 ` Jürgen Groß
2019-11-07 6:26 ` hpa
2019-11-07 16:44 ` Stephen Hemminger
2019-11-07 9:13 ` Peter Zijlstra
2019-11-06 19:35 ` [patch 9/9] selftests/x86/iopl: Verify that CLI/STI result in #GP Thomas Gleixner
2019-11-07 7:28 ` [patch] x86/iopl: Remove unused local variable, update comments in ksys_ioperm() Ingo Molnar
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