linux-kernel - Re: [Qemu-devel] [PATCH 00/17] RFC: userfault v2

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Message-ID: <CAFEAcA9JNVsT57Zgy96+cfdWBABE4_g4yJG7Te8Oa8ReXZqeRQ@mail.gmail.com>
Date:	Wed, 29 Oct 2014 17:56:59 +0000
From:	Peter Maydell <peter.maydell@...aro.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	zhanghailiang <zhang.zhanghailiang@...wei.com>,
	Robert Love <rlove@...gle.com>, Dave Hansen <dave@...1.net>,
	Jan Kara <jack@...e.cz>, kvm-devel <kvm@...r.kernel.org>,
	Neil Brown <neilb@...e.de>,
	Stefan Hajnoczi <stefanha@...il.com>,
	QEMU Developers <qemu-devel@...gnu.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	Taras Glek <tglek@...illa.com>,
	Andrew Jones <drjones@...hat.com>,
	Juan Quintela <quintela@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Isaku Yamahata <yamahata@...inux.co.jp>,
	Mel Gorman <mgorman@...e.de>,
	Sasha Levin <sasha.levin@...cle.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	"Dr. David Alan Gilbert" <dgilbert@...hat.com>,
	"Huangpeng (Peter)" <peter.huangpeng@...wei.com>,
	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Christopher Covington <cov@...eaurora.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Keith Packard <keithp@...thp.com>,
	Wenchao Xia <wenchaoqemu@...il.com>,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Minchan Kim <minchan@...nel.org>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mike Hommey <mh@...ndium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Feiner <pfeiner@...gle.com>
Subject: Re: [Qemu-devel] [PATCH 00/17] RFC: userfault v2

On 29 October 2014 17:46, Andrea Arcangeli <aarcange@...hat.com> wrote:
> After some chat during the KVMForum I've been already thinking it
> could be beneficial for some usage to give userland the information
> about the fault being read or write

...I wonder if that would let us replace the current nasty
mess we use in linux-user to detect read vs write faults
(which uses a bunch of architecture-specific hacks including
in some cases "look at the insn that triggered this SEGV and
decode it to see if it was a load or a store"; see the
various cpu_signal_handler() implementations in user-exec.c).

-- PMM
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