diff mbox

[v17,2/9] docs: vm generation id device's description

Message ID 1453208789-42479-3-git-send-email-imammedo@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Igor Mammedov Jan. 19, 2016, 1:06 p.m. UTC
From: Gal Hammer <ghammer@redhat.com>

Signed-off-by: Gal Hammer <ghammer@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 docs/specs/vmgenid.txt | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 docs/specs/vmgenid.txt

Comments

Eric Blake Jan. 20, 2016, 4:40 p.m. UTC | #1
On 01/19/2016 06:06 AM, Igor Mammedov wrote:
> From: Gal Hammer <ghammer@redhat.com>
> 
> Signed-off-by: Gal Hammer <ghammer@redhat.com>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>  docs/specs/vmgenid.txt | 36 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 36 insertions(+)
>  create mode 100644 docs/specs/vmgenid.txt
> 
> diff --git a/docs/specs/vmgenid.txt b/docs/specs/vmgenid.txt
> new file mode 100644
> index 0000000..718850a
> --- /dev/null
> +++ b/docs/specs/vmgenid.txt
> @@ -0,0 +1,36 @@
> +VIRTUAL MACHINE GENERATION ID
> +=============================
> +
> +Copyright (C) 2014 Red Hat, Inc.

Do you want to add 2016?

Otherwise,
Reviewed-by: Eric Blake <eblake@redhat.com>
Igor Mammedov Jan. 21, 2016, 12:43 p.m. UTC | #2
On Wed, 20 Jan 2016 09:40:04 -0700
Eric Blake <eblake@redhat.com> wrote:

> On 01/19/2016 06:06 AM, Igor Mammedov wrote:
> > From: Gal Hammer <ghammer@redhat.com>
> > 
> > Signed-off-by: Gal Hammer <ghammer@redhat.com>
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ---
> >  docs/specs/vmgenid.txt | 36 ++++++++++++++++++++++++++++++++++++
> >  1 file changed, 36 insertions(+)
> >  create mode 100644 docs/specs/vmgenid.txt
> > 
> > diff --git a/docs/specs/vmgenid.txt b/docs/specs/vmgenid.txt
> > new file mode 100644
> > index 0000000..718850a
> > --- /dev/null
> > +++ b/docs/specs/vmgenid.txt
> > @@ -0,0 +1,36 @@
> > +VIRTUAL MACHINE GENERATION ID
> > +=============================
> > +
> > +Copyright (C) 2014 Red Hat, Inc.
> 
> Do you want to add 2016?
Sure, I'll fix it up.

> 
> Otherwise,
> Reviewed-by: Eric Blake <eblake@redhat.com>
>
diff mbox

Patch

diff --git a/docs/specs/vmgenid.txt b/docs/specs/vmgenid.txt
new file mode 100644
index 0000000..718850a
--- /dev/null
+++ b/docs/specs/vmgenid.txt
@@ -0,0 +1,36 @@ 
+VIRTUAL MACHINE GENERATION ID
+=============================
+
+Copyright (C) 2014 Red Hat, Inc.
+
+This work is licensed under the terms of the GNU GPL, version 2 or later.
+See the COPYING file in the top-level directory.
+
+===
+
+The VM generation ID (vmgenid) device is an emulated device which
+exposes a 128-bit, cryptographically random, integer value identifier.
+This allows management applications (e.g. libvirt) to notify the guest
+operating system when the virtual machine is executed with a different
+configuration (e.g. snapshot execution or creation from a template).
+
+This is specified on the web at: http://go.microsoft.com/fwlink/?LinkId=260709
+
+---
+
+The vmgenid device is a PCI device with the following ACPI ID: "QEMU0003".
+
+The device has a "vmgenid.uuid" property, which can be set using
+the command line argument or the QMP interface.
+For example:
+QEMU  -device vmgenid,id=FOO,uuid="324e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"
+
+Or to change uuid in runtime use:
+ qom-set "/machine/peripheral/FOO.uuid" "124e6eaf-d1d1-4bf6-bf41-b9bb6c91fb87"
+
+According to the specification, any change to the GUID executes an
+ACPI notification. The vmgenid device triggers the \_GPE._E00 handler
+which executes the ACPI Notify operation.
+
+Although not specified in Microsoft's document, it is assumed that the
+device is expected to use the little-endian system.