linux-kernel - Re: [RFC patch 03/15] x86/entry: Use generic syscall entry function

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Message-ID: <alpine.DEB.2.21.1909231040270.2003@nanos.tec.linutronix.de>
Date:   Mon, 23 Sep 2019 10:40:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [RFC patch 03/15] x86/entry: Use generic syscall entry
 function

On Mon, 23 Sep 2019, Peter Zijlstra wrote:

> On Fri, Sep 20, 2019 at 04:41:03PM -0700, Andy Lutomirski wrote:
> > On Thu, Sep 19, 2019 at 8:09 AM Thomas Gleixner <tglx@...utronix.de> wrote:
> > >
> > > Replace the syscall entry work handling with the generic version, Provide
> > > the necessary helper inlines to handle the real architecture specific
> > > parts, e.g. audit and seccomp invocations.
> > 
> > > -       if (work & (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU)) {
> > > -               ret = tracehook_report_syscall_entry(regs);
> > > -               if (ret || (work & _TIF_SYSCALL_EMU))
> > > -                       return -1L;
> > > -       }
> > 
> > Unless I missed something, you lost the _TIF_SYSCALL_EMU abomination.
> 
> IIUC that's actually in patch #1.

Correct:

+       if (ti_work & (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU)) {
+               ret = arch_syscall_enter_tracehook(regs);
+               if (ret || (ti_work & _TIF_SYSCALL_EMU))
+                       return -1L;
+       }