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Date: Mon, 30 Mar 2015 17:47:45 +0200
From: Igor Mammedov <imammedo@redhat.com>
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	<a6ea83cc6ff226e759b46bf6a4f9aa014d91546c.1427425363.git.zhugh.fnst@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [PATCH v5 1/7] docs: update documentation for
	memory hot unplug
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To: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Cc: guz.fnst@cn.fujitsu.com, pbonzini@redhat.com, tangchen@cn.fujitsu.com, qemu-devel@nongnu.org, izumi.taku@jp.fujitsu.com

On Fri, 27 Mar 2015 17:20:34 +0800
Zhu Guihua <zhugh.fnst@cn.fujitsu.com> wrote:

> Add specification about how to use memory hot unplug, and add
> a flow diagram to explain memory hot unplug process.
>=20
> Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
> ---
>  docs/memory-hotplug.txt         | 24 ++++++++++++++++++++----
>  docs/specs/acpi_mem_hotplug.txt | 16 +++++++++++++++-
>  2 files changed, 35 insertions(+), 5 deletions(-)
>=20
> diff --git a/docs/memory-hotplug.txt b/docs/memory-hotplug.txt
> index f70571d..0de7f1b 100644
> --- a/docs/memory-hotplug.txt
> +++ b/docs/memory-hotplug.txt
> @@ -1,12 +1,10 @@
>  QEMU memory hotplug
>  =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =20
> -This document explains how to use the memory hotplug feature in QEMU,
> +This part explains how to use the memory hotplug feature in QEMU,
>  which is present since v2.1.0.
not related change? It's better to leave as it was.

> =20
> -Please, note that memory hotunplug is not supported yet. This means
> -that you're able to add memory, but you're not able to remove it.
> -Also, proper guest support is required for memory hotplug to work.
> +And, proper guest support is required for memory hotplug to work.
reword it like:
Guest support is required for memory hotplug to work.

> =20
>  Basic RAM hotplug
>  -----------------
> @@ -74,3 +72,21 @@ comes from regular RAM, 1GB is a 1GB hugepage page and=
 256MB is from
>     -device pc-dimm,id=3Ddimm1,memdev=3Dmem1 \
>     -object memory-backend-file,id=3Dmem2,size=3D256M,mem-path=3D/mnt/hug=
epages-2MB \
>     -device pc-dimm,id=3Ddimm2,memdev=3Dmem2
> +
> +
> +QEMU memory hot unplug
> +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
s/^^^/
RAM hot-unplug
--------------
/

> +This part explains how to use the memory hot unplug feature in QEMU.
unnecessary, drop it.

> +
> +In order to be able to hot unplug pc-dimm device, QEMU has to be told th=
e id
> +of pc-dimm device. The id was assigned when you hot plugged memory.
> +
> +One monitor command is used to hot unplug memory:
s/One/Two/

Haven't you forgotten about object_del ???
In typical use-case backend will be deleted as well

> +
> + - "device_del": deletes a front-end pc-dimm device
> +
> +For example, assuming that the pc-dimm device with id "dimm1"  =20
> +into the guest, the following command deletes the pc-dimm device from the
> +guest.
s/was hotplugged into the guest/exists/
s/deletes the pc-dimm device from the guest/tries to remove it/

> +
> +  (qemu) device_del dimm1
remove associated backend as well

> diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplu=
g.txt
> index 1290994..a88b286 100644
> --- a/docs/specs/acpi_mem_hotplug.txt
> +++ b/docs/specs/acpi_mem_hotplug.txt
> @@ -2,7 +2,7 @@ QEMU<->ACPI BIOS memory hotplug interface
>  --------------------------------------
> =20
>  ACPI BIOS GPE.3 handler is dedicated for notifying OS about memory hot-a=
dd
> -events.
> +and hot-remove events.
> =20
>  Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access):
>  ---------------------------------------------------------------
> @@ -42,3 +42,17 @@ Selecting memory device slot beyond present range has =
no effect on platform:
>       ignored
>     - read accesses to memory hot-plug registers not documented above ret=
urn
>       all bits set to 1.
> +
> +Memory hot remove process diagram:
> +----------------------------------


> +Memory hot unplug is rather complicated multi-stage process, it is async=
hronous
> +procedures. The follwoing diagram describes memory hot unplug process.
drop ^^^ hunk


> +
> +             QEMU             |             Guest OS
> +------------------------------------------------------------------------=
-------
> +     unplug request cb ->     |
> +                              |  OSPM processes ejection request
> +                              |  <- OSPM clears device remove event
> +    clear remove event ->     |
> +                              |  <- OSPM issues _EJ0 and initiates devic=
e eject
> +  unplug cb (eject device)    |
perhaps something like below would be better

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------------------+=E2=80=89=E2=80=89=E2=80=89=E2=80=89=E2=80=89=E2=80=89+-=
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=E2=80=89+-----------------------------------------------------------------=
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