[Qemu-devel] [PATCH v3 0/3] Deprecate QMP & HMP `cpu-add`; document vCPU hotplug

[Qemu-devel] [PATCH v3 0/3] Deprecate QMP & HMP `cpu-add`; document vCPU hotplug

[Kashyap Chamarthy]

The first patch deprecates the QMP `cpu-add`, the second its HMP 
equivalent, and the third documents vCPU hotplug procedure using QMP
`device_add` et al.

v2: https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03191.html

Kashyap Chamarthy (3):
  Deprecate QMP `cpu-add`
  Deprecate HMP `cpu-add`
  docs: Document vCPU hotplug procedure

 docs/cpu-hotplug.rst | 142 +++++++++++++++++++++++++++++++++++++++++++
 hmp-commands.hx      |   6 +-
 hmp.c                |   2 +
 qapi/misc.json       |   8 ++-
 qemu-deprecated.texi |   5 ++
 5 files changed, 160 insertions(+), 3 deletions(-)
 create mode 100644 docs/cpu-hotplug.rst

-- 
2.17.1

[Qemu-devel] [PATCH v3 1/3] Deprecate QMP `cpu-add`

[Kashyap Chamarthy]

The intended functionality of QMP `cpu-add` is replaced with
`device_add` (and `query-hotpluggable-cpus`).  So let's deprecate
`cpu-add`.

A complete example of vCPU hotplug with the recommended way (using
`device_add`) is provided as part of a seperate docs patch.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com
Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
---
---
 qapi/misc.json       | 8 +++++++-
 qemu-deprecated.texi | 5 +++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/qapi/misc.json b/qapi/misc.json
index d450cfef21..fbee1e6d34 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -1104,7 +1104,7 @@
 ##
 # @cpu-add:
 #
-# Adds CPU with specified ID
+# Adds CPU with specified ID.
 #
 # @id: ID of CPU to be created, valid values [0..max_cpus)
 #
@@ -1112,6 +1112,10 @@
 #
 # Since: 1.5
 #
+# Note: This command is deprecated.  The `device_add` command should be
+#       used instead.  See the `query-hotpluggable-cpus` command for
+#       details.
+#
 # Example:
 #
 # -> { "execute": "cpu-add", "arguments": { "id": 2 } }
@@ -3213,6 +3217,8 @@
 ##
 # @query-hotpluggable-cpus:
 #
+# TODO: Better documentation; currently there is none.
+#
 # Returns: a list of HotpluggableCPU objects.
 #
 # Since: 2.7
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 1b9c007f12..c86924ad9a 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -155,6 +155,11 @@ The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 The ``arch'' output member of the ``query-cpus-fast'' command is
 replaced by the ``target'' output member.
 
+@subsection cpu-add (since 3.1)
+
+Use ``device_add'' for hotplugging vCPUs instead of ``cpu-add''.  See
+documentation of ``query-hotpluggable-cpus'' for additional details.
+
 @section System emulator devices
 
 @subsection ivshmem (since 2.6.0)
-- 
2.17.1

Re: [Qemu-devel] [PATCH v3 1/3] Deprecate QMP `cpu-add`

[Thomas Huth]

On 2018-10-30 13:35, Kashyap Chamarthy wrote:
> The intended functionality of QMP `cpu-add` is replaced with
> `device_add` (and `query-hotpluggable-cpus`).  So let's deprecate
> `cpu-add`.
> 
> A complete example of vCPU hotplug with the recommended way (using
> `device_add`) is provided as part of a seperate docs patch.
> 
> Suggested-by: Eduardo Habkost <ehabkost@redhat.com
> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> ---
> ---

Duplicated "---" line ... but I think this should not be a problem for
the usual tools.

Reviewed-by: Thomas Huth <thuth@redhat.com>

Re: [Qemu-devel] [PATCH v3 1/3] Deprecate QMP `cpu-add`

[Thomas Huth]

On 2018-10-30 13:35, Kashyap Chamarthy wrote:
> The intended functionality of QMP `cpu-add` is replaced with
> `device_add` (and `query-hotpluggable-cpus`).  So let's deprecate
> `cpu-add`.
> 
> A complete example of vCPU hotplug with the recommended way (using
> `device_add`) is provided as part of a seperate docs patch.
> 
> Suggested-by: Eduardo Habkost <ehabkost@redhat.com
> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> ---
[...]
> diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
> index 1b9c007f12..c86924ad9a 100644
> --- a/qemu-deprecated.texi
> +++ b/qemu-deprecated.texi
> @@ -155,6 +155,11 @@ The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
>  The ``arch'' output member of the ``query-cpus-fast'' command is
>  replaced by the ``target'' output member.
>  
> +@subsection cpu-add (since 3.1)

 Hi Kashyap,

could you please send a follow-up patch to change this into 4.0 now?

Please also provide a patch to add the HMP command to
qemu-deprecated.texi, too.

 Thanks,
  Thomas

Re: [Qemu-devel] [PATCH v3 1/3] Deprecate QMP `cpu-add`

[Kashyap Chamarthy]

On Thu, Dec 13, 2018 at 07:38:03AM +0100, Thomas Huth wrote:
> On 2018-10-30 13:35, Kashyap Chamarthy wrote:
> > The intended functionality of QMP `cpu-add` is replaced with
> > `device_add` (and `query-hotpluggable-cpus`).  So let's deprecate
> > `cpu-add`.
> > 
> > A complete example of vCPU hotplug with the recommended way (using
> > `device_add`) is provided as part of a seperate docs patch.
> > 
> > Suggested-by: Eduardo Habkost <ehabkost@redhat.com
> > Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> > ---
> [...]
> > diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
> > index 1b9c007f12..c86924ad9a 100644
> > --- a/qemu-deprecated.texi
> > +++ b/qemu-deprecated.texi
> > @@ -155,6 +155,11 @@ The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
> >  The ``arch'' output member of the ``query-cpus-fast'' command is
> >  replaced by the ``target'' output member.
> >  
> > +@subsection cpu-add (since 3.1)
> 
>  Hi Kashyap,
> 
> could you please send a follow-up patch to change this into 4.0 now?

Ah, sure.

> Please also provide a patch to add the HMP command to
> qemu-deprecated.texi, too.

Is it okay if both the above are done in the same patch?  Since they're
related.  Or am I missing a reason to do them separately?

-- 
/kashyap

Re: [Qemu-devel] [PATCH v3 1/3] Deprecate QMP `cpu-add`

[Kashyap Chamarthy]

On Thu, Dec 13, 2018 at 12:05:05PM +0100, Kashyap Chamarthy wrote:
> On Thu, Dec 13, 2018 at 07:38:03AM +0100, Thomas Huth wrote:
> > On 2018-10-30 13:35, Kashyap Chamarthy wrote:

[...]

> > > index 1b9c007f12..c86924ad9a 100644
> > > --- a/qemu-deprecated.texi
> > > +++ b/qemu-deprecated.texi
> > > @@ -155,6 +155,11 @@ The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
> > >  The ``arch'' output member of the ``query-cpus-fast'' command is
> > >  replaced by the ``target'' output member.
> > >  
> > > +@subsection cpu-add (since 3.1)
> > 
> >  Hi Kashyap,
> > 
> > could you please send a follow-up patch to change this into 4.0 now?
> 
> Ah, sure.
> 
> > Please also provide a patch to add the HMP command to
> > qemu-deprecated.texi, too.
> 
> Is it okay if both the above are done in the same patch?  Since they're
> related.  Or am I missing a reason to do them separately?

Okay, please disregard the above; Dave Gilbert reminded that it's
preferable that I send two separate patches (part of a "series"), as
they're different things.

-- 
/kashyap

[Qemu-devel] [PATCH v3 2/3] Deprecate HMP `cpu-add`

[Kashyap Chamarthy]

Since we're deprecating the QMP `cpu-add`, let's deprecate its HMP
equivalent, too.

Suggested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
---
 hmp-commands.hx | 6 ++++--
 hmp.c           | 2 ++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index db0c681f74..ba71558c25 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1849,14 +1849,16 @@ ETEXI
         .name       = "cpu-add",
         .args_type  = "id:i",
         .params     = "id",
-        .help       = "add cpu",
+        .help       = "add cpu (deprecated, use device_add instead)",
         .cmd        = hmp_cpu_add,
     },
 
 STEXI
 @item cpu-add @var{id}
 @findex cpu-add
-Add CPU with id @var{id}
+Add CPU with id @var{id}.  This command is deprecated, please
++use @code{device_add} instead. For details, refer to
+'docs/cpu-hotplug.rst'.
 ETEXI
 
     {
diff --git a/hmp.c b/hmp.c
index 4975fa56b0..c3f3db7795 100644
--- a/hmp.c
+++ b/hmp.c
@@ -2353,6 +2353,8 @@ void hmp_cpu_add(Monitor *mon, const QDict *qdict)
     int cpuid;
     Error *err = NULL;
 
+    error_report("cpu_add is deprecated, please use device_add instead");
+
     cpuid = qdict_get_int(qdict, "id");
     qmp_cpu_add(cpuid, &err);
     hmp_handle_error(mon, &err);
-- 
2.17.1

Re: [Qemu-devel] [PATCH v3 2/3] Deprecate HMP `cpu-add`

[Markus Armbruster]

Kashyap Chamarthy <kchamart@redhat.com> writes:

> Since we're deprecating the QMP `cpu-add`, let's deprecate its HMP
> equivalent, too.
>
> Suggested-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> ---
>  hmp-commands.hx | 6 ++++--
>  hmp.c           | 2 ++
>  2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index db0c681f74..ba71558c25 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1849,14 +1849,16 @@ ETEXI
>          .name       = "cpu-add",
>          .args_type  = "id:i",
>          .params     = "id",
> -        .help       = "add cpu",
> +        .help       = "add cpu (deprecated, use device_add instead)",
>          .cmd        = hmp_cpu_add,
>      },
>  
>  STEXI
>  @item cpu-add @var{id}
>  @findex cpu-add
> -Add CPU with id @var{id}
> +Add CPU with id @var{id}.  This command is deprecated, please
> ++use @code{device_add} instead. For details, refer to
> +'docs/cpu-hotplug.rst'.

File gets created only in PATCH 3.  Let's apply PATCH 3 before 1 & 2.
Perhaps the maintainer is willing to do that for you, so you don't have
to respin.

>  ETEXI
>  
>      {
> diff --git a/hmp.c b/hmp.c
> index 4975fa56b0..c3f3db7795 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -2353,6 +2353,8 @@ void hmp_cpu_add(Monitor *mon, const QDict *qdict)
>      int cpuid;
>      Error *err = NULL;
>  
> +    error_report("cpu_add is deprecated, please use device_add instead");
> +
>      cpuid = qdict_get_int(qdict, "id");
>      qmp_cpu_add(cpuid, &err);
>      hmp_handle_error(mon, &err);

Re: [Qemu-devel] [PATCH v3 2/3] Deprecate HMP `cpu-add`

[Thomas Huth]

On 2018-10-30 13:35, Kashyap Chamarthy wrote:
> Since we're deprecating the QMP `cpu-add`, let's deprecate its HMP
> equivalent, too.
> 
> Suggested-by: Thomas Huth <thuth@redhat.com>
> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> ---
>  hmp-commands.hx | 6 ++++--
>  hmp.c           | 2 ++
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index db0c681f74..ba71558c25 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1849,14 +1849,16 @@ ETEXI
>          .name       = "cpu-add",
>          .args_type  = "id:i",
>          .params     = "id",
> -        .help       = "add cpu",
> +        .help       = "add cpu (deprecated, use device_add instead)",
>          .cmd        = hmp_cpu_add,
>      },
>  
>  STEXI
>  @item cpu-add @var{id}
>  @findex cpu-add
> -Add CPU with id @var{id}
> +Add CPU with id @var{id}.  This command is deprecated, please
> ++use @code{device_add} instead. For details, refer to
> +'docs/cpu-hotplug.rst'.
>  ETEXI
>  
>      {
> diff --git a/hmp.c b/hmp.c
> index 4975fa56b0..c3f3db7795 100644
> --- a/hmp.c
> +++ b/hmp.c
> @@ -2353,6 +2353,8 @@ void hmp_cpu_add(Monitor *mon, const QDict *qdict)
>      int cpuid;
>      Error *err = NULL;
>  
> +    error_report("cpu_add is deprecated, please use device_add instead");
> +
>      cpuid = qdict_get_int(qdict, "id");
>      qmp_cpu_add(cpuid, &err);
>      hmp_handle_error(mon, &err);
> 

I think you should also mention this explicitly in qemu-deprecated.texi,
too.

 Thomas

Re: [Qemu-devel] [PATCH v3 2/3] Deprecate HMP `cpu-add`

[Kashyap Chamarthy]

On Mon, Nov 05, 2018 at 12:20:05PM +0100, Thomas Huth wrote:
> On 2018-10-30 13:35, Kashyap Chamarthy wrote:
> > Since we're deprecating the QMP `cpu-add`, let's deprecate its HMP
> > equivalent, too.
> > 
> > Suggested-by: Thomas Huth <thuth@redhat.com>
> > Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>

[...]

> > diff --git a/hmp.c b/hmp.c
> > index 4975fa56b0..c3f3db7795 100644
> > --- a/hmp.c
> > +++ b/hmp.c
> > @@ -2353,6 +2353,8 @@ void hmp_cpu_add(Monitor *mon, const QDict *qdict)
> >      int cpuid;
> >      Error *err = NULL;
> >  
> > +    error_report("cpu_add is deprecated, please use device_add instead");
> > +
> >      cpuid = qdict_get_int(qdict, "id");
> >      qmp_cpu_add(cpuid, &err);
> >      hmp_handle_error(mon, &err);
> > 
> 
> I think you should also mention this explicitly in qemu-deprecated.texi,
> too.

I think you mean I should explicitly mention that the HMP equivalent is
also deprecated -- currently I only call out the QMP command:
'qemu-deprecated.texi'.

I saw that Eduardo already queued this series; maybe I can add a
follow-up if it can't be tweaked before submitting a pull request.

Thanks for the review!

-- 
/kashyap

Re: [Qemu-devel] [PATCH v3 2/3] Deprecate HMP `cpu-add`

[Thomas Huth]

On 2018-11-07 09:49, Kashyap Chamarthy wrote:
> On Mon, Nov 05, 2018 at 12:20:05PM +0100, Thomas Huth wrote:
>> On 2018-10-30 13:35, Kashyap Chamarthy wrote:
>>> Since we're deprecating the QMP `cpu-add`, let's deprecate its HMP
>>> equivalent, too.
>>>
>>> Suggested-by: Thomas Huth <thuth@redhat.com>
>>> Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
> 
> [...]
> 
>>> diff --git a/hmp.c b/hmp.c
>>> index 4975fa56b0..c3f3db7795 100644
>>> --- a/hmp.c
>>> +++ b/hmp.c
>>> @@ -2353,6 +2353,8 @@ void hmp_cpu_add(Monitor *mon, const QDict *qdict)
>>>      int cpuid;
>>>      Error *err = NULL;
>>>  
>>> +    error_report("cpu_add is deprecated, please use device_add instead");
>>> +
>>>      cpuid = qdict_get_int(qdict, "id");
>>>      qmp_cpu_add(cpuid, &err);
>>>      hmp_handle_error(mon, &err);
>>>
>>
>> I think you should also mention this explicitly in qemu-deprecated.texi,
>> too.
> 
> I think you mean I should explicitly mention that the HMP equivalent is
> also deprecated -- currently I only call out the QMP command:
> 'qemu-deprecated.texi'.
> 
> I saw that Eduardo already queued this series; maybe I can add a
> follow-up if it can't be tweaked before submitting a pull request.

Yes, a follow-up patch is perfectly fine for this.

 Thanks,
  Thomas

[Qemu-devel] [PATCH v3 3/3] docs: Document vCPU hotplug procedure

[Kashyap Chamarthy]

Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
---
 docs/cpu-hotplug.rst | 142 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 docs/cpu-hotplug.rst

diff --git a/docs/cpu-hotplug.rst b/docs/cpu-hotplug.rst
new file mode 100644
index 0000000000..1c268e00b4
--- /dev/null
+++ b/docs/cpu-hotplug.rst
@@ -0,0 +1,142 @@
+===================
+Virtual CPU hotplug
+===================
+
+A complete example of vCPU hotplug (and hot-unplug) using QMP
+``device_add`` and ``device_del``.
+
+vCPU hotplug
+------------
+
+(1) Launch QEMU as follows (note that the "maxcpus" is mandatory to
+    allow vCPU hotplug)::
+
+      $ qemu-system-x86_64 -display none -no-user-config -m 2048 \
+          -nodefaults -monitor stdio -machine pc,accel=kvm,usb=off \
+          -smp 1,maxcpus=2 -cpu IvyBridge-IBRS \
+          -qmp unix:/tmp/qmp-sock,server,nowait
+
+(2) Run 'qmp-shell' (located in the source tree, under: "scripts/qmp/)
+    to connect to the just-launched QEMU::
+
+      $> ./qmp-shell -p -v /tmp/qmp-sock
+      [...]
+      (QEMU)
+
+(3) Find out which CPU types could be plugged, and into which sockets::
+
+      (QEMU) query-hotpluggable-cpus
+      {
+          "execute": "query-hotpluggable-cpus",
+          "arguments": {}
+      }
+      {
+          "return": [
+              {
+                  "type": "IvyBridge-IBRS-x86_64-cpu",
+                  "vcpus-count": 1,
+                  "props": {
+                      "socket-id": 1,
+                      "core-id": 0,
+                      "thread-id": 0
+                  }
+              },
+              {
+                  "qom-path": "/machine/unattached/device[0]",
+                  "type": "IvyBridge-IBRS-x86_64-cpu",
+                  "vcpus-count": 1,
+                  "props": {
+                      "socket-id": 0,
+                      "core-id": 0,
+                      "thread-id": 0
+                  }
+              }
+          ]
+      }
+      (QEMU)
+
+(4) The ``query-hotpluggable-cpus`` command returns an object for CPUs
+    that are present (containing a "qom-path" member) or which may be
+    hot-plugged (no "qom-path" member).  From its output in step (3), we
+    can see that ``IvyBridge-IBRS-x86_64-cpu`` is present in socket 0,
+    while hot-plugging a CPU into socket 1 requires passing the listed
+    properties to QMP ``device_add``:
+
+      (QEMU) device_add id=cpu-2 driver=IvyBridge-IBRS-x86_64-cpu socket-id=1 core-id=0 thread-id=0
+      {
+          "execute": "device_add",
+          "arguments": {
+              "socket-id": 1,
+              "driver": "IvyBridge-IBRS-x86_64-cpu",
+              "id": "cpu-2",
+              "core-id": 0,
+              "thread-id": 0
+          }
+      }
+      {
+          "return": {}
+      }
+      (QEMU)
+
+(5) Optionally, run QMP `query-cpus-fast` for some details about the
+    vCPUs::
+
+      (QEMU) query-cpus-fast
+      {
+          "execute": "query-cpus-fast",
+          "arguments": {}
+      }
+      {
+          "return": [
+              {
+                  "qom-path": "/machine/unattached/device[0]",
+                  "target": "x86_64",
+                  "thread-id": 11534,
+                  "cpu-index": 0,
+                  "props": {
+                      "socket-id": 0,
+                      "core-id": 0,
+                      "thread-id": 0
+                  },
+                  "arch": "x86"
+              },
+              {
+                  "qom-path": "/machine/peripheral/cpu-2",
+                  "target": "x86_64",
+                  "thread-id": 12106,
+                  "cpu-index": 1,
+                  "props": {
+                      "socket-id": 1,
+                      "core-id": 0,
+                      "thread-id": 0
+                  },
+                  "arch": "x86"
+              }
+          ]
+      }
+      (QEMU)
+
+vCPU hot-unplug
+---------------
+
+From the 'qmp-shell', invoke the QMP ``device_del`` command::
+
+      (QEMU) device_del id=cpu-2
+      {
+          "execute": "device_del",
+          "arguments": {
+              "id": "cpu-2"
+          }
+      }
+      {
+          "return": {}
+      }
+      (QEMU)
+
+.. note::
+    vCPU hot-unplug requires guest cooperation; so the ``device_del``
+    command above does not guarantee vCPU removal -- it's a "request to
+    unplug".  At this point, the guest will get a System Control
+    Interupt (SCI) and calls the ACPI handler for the affected vCPU
+    device.  Then the guest kernel will bring the vCPU offline and tell
+    QEMU to unplug it.
-- 
2.17.1

Re: [Qemu-devel] [PATCH v3 0/3] Deprecate QMP & HMP `cpu-add`; document vCPU hotplug

[Kashyap Chamarthy]

[Cc: libvir-list]

On Tue, Oct 30, 2018 at 01:35:23PM +0100, Kashyap Chamarthy wrote:
> The first patch deprecates the QMP `cpu-add`, the second its HMP 
> equivalent, and the third documents vCPU hotplug procedure using QMP
> `device_add` et al.
> 
> v2: https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03191.html
> 
> Kashyap Chamarthy (3):
>   Deprecate QMP `cpu-add`
>   Deprecate HMP `cpu-add`
>   docs: Document vCPU hotplug procedure
> 
>  docs/cpu-hotplug.rst | 142 +++++++++++++++++++++++++++++++++++++++++++
>  hmp-commands.hx      |   6 +-
>  hmp.c                |   2 +
>  qapi/misc.json       |   8 ++-
>  qemu-deprecated.texi |   5 ++
>  5 files changed, 160 insertions(+), 3 deletions(-)
>  create mode 100644 docs/cpu-hotplug.rst
> 
> -- 
> 2.17.1
> 

-- 
/kashyap

Re: [Qemu-devel] [PATCH v3 0/3] Deprecate QMP & HMP `cpu-add`; document vCPU hotplug

[Michal Privoznik]

On 10/30/2018 02:00 PM, Kashyap Chamarthy wrote:
> [Cc: libvir-list]
> 
> On Tue, Oct 30, 2018 at 01:35:23PM +0100, Kashyap Chamarthy wrote:
>> The first patch deprecates the QMP `cpu-add`, the second its HMP 
>> equivalent, and the third documents vCPU hotplug procedure using QMP
>> `device_add` et al.

Thanks for heads up. Libvirt already uses device_add if
'query-hotpluggable-cpus' command is available and 'query-machines'
returns 'hotpluggable-cpus: yes' for given machine type. It only falls
back to cpu-add.

Michal

Re: [Qemu-devel] [PATCH v3 0/3] Deprecate QMP & HMP `cpu-add`; document vCPU hotplug

[Markus Armbruster]

Kashyap Chamarthy <kchamart@redhat.com> writes:

> The first patch deprecates the QMP `cpu-add`, the second its HMP 
> equivalent, and the third documents vCPU hotplug procedure using QMP
> `device_add` et al.
>
> v2: https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03191.html

Preferably reordered so that PATCH 3 comes before 1 & 2, series
Reviewed-by: Markus Armbruster <armbru@redhat.com>

Re: [Qemu-devel] [PATCH v3 0/3] Deprecate QMP & HMP `cpu-add`; document vCPU hotplug

[Eduardo Habkost]

On Wed, Oct 31, 2018 at 04:17:26PM +0100, Markus Armbruster wrote:
> Kashyap Chamarthy <kchamart@redhat.com> writes:
> 
> > The first patch deprecates the QMP `cpu-add`, the second its HMP 
> > equivalent, and the third documents vCPU hotplug procedure using QMP
> > `device_add` et al.
> >
> > v2: https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg03191.html
> 
> Preferably reordered so that PATCH 3 comes before 1 & 2, series
> Reviewed-by: Markus Armbruster <armbru@redhat.com>

Thanks, queued on machine-next.

Being only documentation updates, I consider it to be reasonable
to be included after soft freeze.

-- 
Eduardo