linux-kernel - Re: [RFC v4 1/2] x86/xen: add xen_is_preemptible

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Message-ID: <CALCETrWXrVAFQix=R33+ixGA34AKO=kR+zUzyWyJY6DWf9gBEA@mail.gmail.com>
Date:	Thu, 22 Jan 2015 17:40:45 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, kvm list <kvm@...r.kernel.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Jan Beulich <JBeulich@...e.com>
Subject: Re: [RFC v4 1/2] x86/xen: add xen_is_preemptible_hypercall()

On Thu, Jan 22, 2015 at 4:29 PM, Luis R. Rodriguez
<mcgrof@...not-panic.com> wrote:
> From: "Luis R. Rodriguez" <mcgrof@...e.com>
>
> On kernels with voluntary or no preemption we can run
> into situations where a hypercall issued through userspace
> will linger around as it addresses sub-operatiosn in kernel
> context (multicalls). Such operations can trigger soft lockup
> detection.

Looks reasonable.

--Andy
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