From: Andy Lutomirski <luto@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Frederic Weisbecker <frederic@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joel Fernandes <joel@joelfernandes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Brian Gerst <brgerst@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will@kernel.org>
Subject: Re: [patch V4 part 2 13/18] x86/kvm: Move context tracking where it belongs
Date: Fri, 8 May 2020 17:14:49 -0700 [thread overview]
Message-ID: <CALCETrWk03x6yuQR5CO+VUbwEFJKZdftmHMEG5BDiRWjowX2_Q@mail.gmail.com> (raw)
In-Reply-To: <20200505134341.379326289@linutronix.de>
On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Context tracking for KVM happens way too early in the vcpu_run()
> code. Anything after guest_enter_irqoff() and before guest_exit_irqoff()
> cannot use RCU and should also be not instrumented.
>
> The current way of doing this covers way too much code. Move it closer to
> the actual vmenter/exit code.
Now you've made me wonder what happens if someone traces
vmx_vcpu_run(). I'm not sure I really want to think about this.
next prev parent reply other threads:[~2020-05-09 0:15 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 13:41 [patch V4 part 2 00/18] x86/entry: Entry/exception code rework, syscall and KVM changes Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 01/18] x86/entry/64: Move non entry code into .text section Thomas Gleixner
2020-05-06 15:51 ` Peter Zijlstra
2020-05-08 1:31 ` Steven Rostedt
2020-05-08 23:53 ` Andy Lutomirski
2020-05-10 13:39 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 02/18] x86/entry/32: " Thomas Gleixner
2020-05-07 13:15 ` Alexandre Chartre
2020-05-07 14:14 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 03/18] x86/entry: Mark enter_from_user_mode() noinstr Thomas Gleixner
2020-05-08 8:21 ` Masami Hiramatsu
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 04/18] x86/entry/common: Protect against instrumentation Thomas Gleixner
2020-05-07 13:39 ` Alexandre Chartre
2020-05-07 14:13 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 05/18] x86/entry: Move irq tracing on syscall entry to C-code Thomas Gleixner
2020-05-07 13:55 ` Alexandre Chartre
2020-05-07 14:10 ` Thomas Gleixner
2020-05-07 15:03 ` Thomas Gleixner
2020-05-07 17:06 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 06/18] x86/entry: Move irq flags tracing to prepare_exit_to_usermode() Thomas Gleixner
2020-05-08 23:57 ` Andy Lutomirski
2020-05-09 10:16 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 07/18] context_tracking: Ensure that the critical path cannot be instrumented Thomas Gleixner
2020-05-08 8:23 ` Masami Hiramatsu
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 08/18] lib/smp_processor_id: Move it into noinstr section Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] x86/speculation/mds: Mark mds_user_clear_cpu_buffers() __always_inline tip-bot2 for Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] lib/smp_processor_id: Move it into noinstr section tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 09/18] x86/speculation/mds: Mark mds_user_clear_cpu_buffers() __always_inline Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 10/18] x86/entry/64: Check IF in __preempt_enable_notrace() thunk Thomas Gleixner
2020-05-07 14:15 ` Alexandre Chartre
2020-05-09 0:10 ` Andy Lutomirski
2020-05-09 10:25 ` Thomas Gleixner
2020-05-10 18:47 ` Thomas Gleixner
2020-05-11 18:27 ` Thomas Gleixner
2020-05-12 1:48 ` Steven Rostedt
2020-05-12 1:51 ` Steven Rostedt
2020-05-12 8:14 ` Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 11/18] x86/entry/64: Mark ___preempt_schedule_notrace() thunk noinstr Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 12/18] x86,objtool: Make entry_64_compat.S objtool clean Thomas Gleixner
2020-05-09 0:11 ` Andy Lutomirski
2020-05-09 10:06 ` Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] x86/entry: " tip-bot2 for Peter Zijlstra
2020-05-05 13:41 ` [patch V4 part 2 13/18] x86/kvm: Move context tracking where it belongs Thomas Gleixner
2020-05-06 7:42 ` Paolo Bonzini
2020-05-09 0:14 ` Andy Lutomirski [this message]
2020-05-09 10:12 ` Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 14/18] x86/kvm/vmx: Add hardirq tracing to guest enter/exit Thomas Gleixner
2020-05-06 7:55 ` Paolo Bonzini
2020-05-05 13:41 ` [patch V4 part 2 15/18] x86/kvm/svm: Handle hardirqs proper on " Thomas Gleixner
2020-05-06 8:15 ` Paolo Bonzini
2020-05-06 8:48 ` Thomas Gleixner
2020-05-06 9:21 ` Paolo Bonzini
2020-05-07 14:44 ` [patch V5 " Thomas Gleixner
2020-05-08 13:45 ` Paolo Bonzini
2020-05-08 14:01 ` Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 16/18] context_tracking: Make guest_enter/exit() .noinstr ready Thomas Gleixner
2020-05-19 19:58 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-05 13:41 ` [patch V4 part 2 17/18] x86/kvm/vmx: Move guest enter/exit into .noinstr.text Thomas Gleixner
2020-05-06 8:17 ` Paolo Bonzini
2020-05-05 13:41 ` [patch V4 part 2 18/18] x86/kvm/svm: " Thomas Gleixner
2020-05-06 8:17 ` Paolo Bonzini
2020-05-07 14:47 ` Alexandre Chartre
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