From: "Michael S. Tsirkin" <mst@redhat.com>
To: li guang <lig.fnst@cn.fujitsu.com>
Cc: "Stefan Berger" <stefanb@linux.vnet.ibm.com>,
qemu-devel@nongnu.org, "Bruce Rogers" <brogers@suse.com>,
"Joel Schopp" <jschopp@linux.vnet.ibm.com>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Anthony Liguori" <anthony@codemonkey.ws>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Andreas Färber" <afaerber@suse.de>,
"Isaku Yamahata" <yamahata@valinux.co.jp>
Subject: Re: [Qemu-devel] [PATCH 0/4] add ACPI Embedded Controller
Date: Mon, 27 May 2013 23:23:24 +0300 [thread overview]
Message-ID: <20130527202324.GB20680@redhat.com> (raw)
In-Reply-To: <1369617779.19028.16.camel@liguang.fnst.cn.fujitsu.com>
On Mon, May 27, 2013 at 09:22:59AM +0800, li guang wrote:
> 在 2013-05-26日的 19:51 -0500,Anthony Liguori写道:
> > li guang <lig.fnst@cn.fujitsu.com> writes:
> >
> > > 在 2013-05-24五的 14:45 +0300,Michael S. Tsirkin写道:
> > >> On Wed, May 22, 2013 at 11:46:33AM +0800, liguang wrote:
> > >> > These patches try to add ACPI Embedded Controller (EC),
> > >> > refer-to:
> > >> > ACPI SPEC v5 chapter 5
> > >> > "ACPI Embedded Controller Interface Specification"
> > >> >
> > >> > EC is a standard ACPI device, it plays flexible roles,
> > >> > e.g.
> > >> > power controller, it can control power sequence for
> > >> > platform to enter or leave system state(0,1,3,4,5),
> > >> > it can controller CPU fan by the temperature of sensor.
> > >> > event carrier, it can pass events between platform
> > >> > and OS, so OS can execute _Qxx method which defined
> > >> > by yourself.
> > >> >
> > >> > So, I want to deliver CPU online/offline event between
> > >> > OS and QEMU for CPU hotplug feature, then we will don't
> > >> > need to "echo 1 > /sys/devices/system/cpu/cpu1/online"
> > >> > again after 'cpu-add'.
> > >> >
> > >> > patches for online/offline event handler of QEUM and
> > >> > linux kernel are writing, and will send once finished.
> > >> >
> > >> > since EC is a common device, so I send pathes separately.
> > >>
> > >> Do any non-linux guests support this device?
> > >>
> > >
> > > In fact, any OSes support ACPI will support this device.
> > > so, windows will.
> >
> > When you say "any OSes supporting ACPI" I think what you really mean is
> > that we can provide bytecode that interacts with the embedded
> > controller.
> >
> > There is not explicit driver in Linux or Windows AFAIK.
>
> Hmm, yep, mostly there's no special driver for EC,
> because it is directly embedded in code for ACPI
> for linux kernel, it's drivers/acpi/ec.c
>
> >
> > I still don't get the point of this. We can make ACPI hotplug work
> > without introducing a new device like this.
> >
>
> when you 'cpu-add' a cpu, acpi driver for cpu will not
> trigger 'cpu_up' for linux kernel AFAIK, unless you add
> a user space program to listen it's uevent and tigger 'cpu_up'.
>
> and EC is not only for ACPI hotplug
> for example, the 'pvpanic', if there's a EC,
> we can pass pvpanic event by EC's ACPI space or Q-event,
> then we will not need this kind of special devices anymore.
>
>
So just to clarify: this patchset doesn't do anything useful
itself, it's some infrastructure that you want to build on
top of?
--
MST
next prev parent reply other threads:[~2013-05-27 20:23 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-22 3:46 [Qemu-devel] [PATCH 0/4] add ACPI Embedded Controller liguang
2013-05-22 3:46 ` [Qemu-devel] [PATCH 1/4] acpi: add ACPI Embedded Controller support liguang
2013-05-22 3:46 ` [Qemu-devel] [PATCH 2/4] acpi/gpe: expand bits of gpe register liguang
2013-05-22 5:28 ` Isaku Yamahata
2013-05-22 5:37 ` li guang
2013-05-24 1:24 ` Isaku Yamahata
2013-05-24 2:02 ` li guang
2013-05-27 9:00 ` Gerd Hoffmann
2013-05-28 0:32 ` li guang
2013-05-27 9:06 ` Gerd Hoffmann
2013-05-22 3:46 ` [Qemu-devel] [PATCH 3/4] ich9: add notifer for ec to generate sci liguang
2013-05-27 20:21 ` Michael S. Tsirkin
2013-05-28 0:23 ` li guang
2013-05-28 6:40 ` Michael S. Tsirkin
2013-05-28 6:44 ` li guang
2013-05-22 3:46 ` [Qemu-devel] [PATCH 4/4][seabios] ec: add ASL for ACPI Embedded Controller liguang
2013-05-23 3:03 ` li guang
2013-05-24 0:34 ` [Qemu-devel] [PATCH 0/4] add " li guang
2013-05-24 11:45 ` Michael S. Tsirkin
2013-05-27 0:20 ` li guang
2013-05-27 0:51 ` Anthony Liguori
2013-05-27 1:22 ` li guang
2013-05-27 11:45 ` Igor Mammedov
2013-05-28 0:28 ` li guang
2013-05-28 8:16 ` Igor Mammedov
2013-05-28 8:34 ` li guang
2013-05-28 9:38 ` Igor Mammedov
2013-05-29 0:23 ` li guang
2013-05-27 20:23 ` Michael S. Tsirkin [this message]
2013-05-28 0:21 ` li guang
2013-05-28 6:31 ` Michael S. Tsirkin
2013-05-28 6:40 ` li guang
2013-05-28 6:48 ` Michael S. Tsirkin
2013-05-28 8:26 ` Igor Mammedov
2013-05-28 8:40 ` li guang
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