[PATCH v2] docs: add misc/qemu-backends.txt

[PATCH v2] docs: add misc/qemu-backends.txt

[Juergen Gross]

Document the interface between qemu and libxl regarding backends
supported by qemu.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
v2: - replace variable Xenstore path parts (<xyz>) with bash-like syntax
      ($XYZ) as requested by Konrad Wilk
    - add remark about de-privileged qemu as requested by Stefano
      Stabellini
    - add comma as suggested by Andrew Cooper
---
 docs/misc/qemu-backends.txt | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 docs/misc/qemu-backends.txt

diff --git a/docs/misc/qemu-backends.txt b/docs/misc/qemu-backends.txt
new file mode 100644
index 0000000..b8e1799
--- /dev/null
+++ b/docs/misc/qemu-backends.txt
@@ -0,0 +1,21 @@
+In order to know whether qemu supports a specific backend type libxl
+needs a way to obtain this information.
+
+As each qemu instance owns a path (named $QEMU from now on) in
+Xenstore, the backend information is presented there. $QEMU is built
+from the domain id where the qemu instance is running $BACKEND_DOM,
+and the domain id of the target domain of the qemu process $DOMID:
+
+$QEMU = /local/domain/$BACKEND_DOM/device-model/$DOMID
+
+Before signalling qemu is running by writing "running" to $QEMU/state
+qemu will create a Xenstore node for each supported backend under
+$QEMU/backends with the backend type as name (e.g.  $QEMU/backends/qdisk
+for the qdisk backend). In case qemu is running de-privileged (not as
+user root) the backend nodes must be written before qemu is dropping
+privileges.
+
+libxl can assume a backend of a specific type $TYPE is supported if:
+- $QEMU/backends/$TYPE is existing in Xenstore
+- or $QEMU/backends is not existing and $TYPE is one of:
+  "console", "vkbd", "vfb", "qdisk", "qnic"
-- 
2.6.6


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Re: [PATCH v2] docs: add misc/qemu-backends.txt

[Konrad Rzeszutek Wilk]

On Mon, Apr 11, 2016 at 03:04:09PM +0200, Juergen Gross wrote:
> Document the interface between qemu and libxl regarding backends
> supported by qemu.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

> ---
> v2: - replace variable Xenstore path parts (<xyz>) with bash-like syntax
>       ($XYZ) as requested by Konrad Wilk
>     - add remark about de-privileged qemu as requested by Stefano
>       Stabellini
>     - add comma as suggested by Andrew Cooper
> ---
>  docs/misc/qemu-backends.txt | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 docs/misc/qemu-backends.txt
> 
> diff --git a/docs/misc/qemu-backends.txt b/docs/misc/qemu-backends.txt
> new file mode 100644
> index 0000000..b8e1799
> --- /dev/null
> +++ b/docs/misc/qemu-backends.txt
> @@ -0,0 +1,21 @@
> +In order to know whether qemu supports a specific backend type libxl
> +needs a way to obtain this information.
> +
> +As each qemu instance owns a path (named $QEMU from now on) in
> +Xenstore, the backend information is presented there. $QEMU is built
> +from the domain id where the qemu instance is running $BACKEND_DOM,
> +and the domain id of the target domain of the qemu process $DOMID:
> +
> +$QEMU = /local/domain/$BACKEND_DOM/device-model/$DOMID
> +
> +Before signalling qemu is running by writing "running" to $QEMU/state
> +qemu will create a Xenstore node for each supported backend under
> +$QEMU/backends with the backend type as name (e.g.  $QEMU/backends/qdisk
> +for the qdisk backend). In case qemu is running de-privileged (not as
> +user root) the backend nodes must be written before qemu is dropping
> +privileges.
> +
> +libxl can assume a backend of a specific type $TYPE is supported if:
> +- $QEMU/backends/$TYPE is existing in Xenstore
> +- or $QEMU/backends is not existing and $TYPE is one of:
> +  "console", "vkbd", "vfb", "qdisk", "qnic"
> -- 
> 2.6.6
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

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Re: [PATCH v2] docs: add misc/qemu-backends.txt

[Stefano Stabellini]

On Mon, 11 Apr 2016, Juergen Gross wrote:
> Document the interface between qemu and libxl regarding backends
> supported by qemu.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>


> v2: - replace variable Xenstore path parts (<xyz>) with bash-like syntax
>       ($XYZ) as requested by Konrad Wilk
>     - add remark about de-privileged qemu as requested by Stefano
>       Stabellini
>     - add comma as suggested by Andrew Cooper
> ---
>  docs/misc/qemu-backends.txt | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 docs/misc/qemu-backends.txt
> 
> diff --git a/docs/misc/qemu-backends.txt b/docs/misc/qemu-backends.txt
> new file mode 100644
> index 0000000..b8e1799
> --- /dev/null
> +++ b/docs/misc/qemu-backends.txt
> @@ -0,0 +1,21 @@
> +In order to know whether qemu supports a specific backend type libxl
> +needs a way to obtain this information.
> +
> +As each qemu instance owns a path (named $QEMU from now on) in
> +Xenstore, the backend information is presented there. $QEMU is built
> +from the domain id where the qemu instance is running $BACKEND_DOM,
> +and the domain id of the target domain of the qemu process $DOMID:
> +
> +$QEMU = /local/domain/$BACKEND_DOM/device-model/$DOMID
> +
> +Before signalling qemu is running by writing "running" to $QEMU/state
> +qemu will create a Xenstore node for each supported backend under
> +$QEMU/backends with the backend type as name (e.g.  $QEMU/backends/qdisk
> +for the qdisk backend). In case qemu is running de-privileged (not as
> +user root) the backend nodes must be written before qemu is dropping
> +privileges.
> +
> +libxl can assume a backend of a specific type $TYPE is supported if:
> +- $QEMU/backends/$TYPE is existing in Xenstore
> +- or $QEMU/backends is not existing and $TYPE is one of:
> +  "console", "vkbd", "vfb", "qdisk", "qnic"

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Re: [PATCH v2] docs: add misc/qemu-backends.txt

[Wei Liu]

On Mon, Apr 11, 2016 at 03:04:09PM +0200, Juergen Gross wrote:
> Document the interface between qemu and libxl regarding backends
> supported by qemu.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Wei Liu <wei.liu2@citrix.com>

> ---
> v2: - replace variable Xenstore path parts (<xyz>) with bash-like syntax
>       ($XYZ) as requested by Konrad Wilk
>     - add remark about de-privileged qemu as requested by Stefano
>       Stabellini
>     - add comma as suggested by Andrew Cooper
> ---
>  docs/misc/qemu-backends.txt | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 docs/misc/qemu-backends.txt
> 
> diff --git a/docs/misc/qemu-backends.txt b/docs/misc/qemu-backends.txt
> new file mode 100644
> index 0000000..b8e1799
> --- /dev/null
> +++ b/docs/misc/qemu-backends.txt
> @@ -0,0 +1,21 @@
> +In order to know whether qemu supports a specific backend type libxl
> +needs a way to obtain this information.
> +
> +As each qemu instance owns a path (named $QEMU from now on) in
> +Xenstore, the backend information is presented there. $QEMU is built
> +from the domain id where the qemu instance is running $BACKEND_DOM,
> +and the domain id of the target domain of the qemu process $DOMID:
> +
> +$QEMU = /local/domain/$BACKEND_DOM/device-model/$DOMID
> +
> +Before signalling qemu is running by writing "running" to $QEMU/state
> +qemu will create a Xenstore node for each supported backend under
> +$QEMU/backends with the backend type as name (e.g.  $QEMU/backends/qdisk
> +for the qdisk backend). In case qemu is running de-privileged (not as
> +user root) the backend nodes must be written before qemu is dropping
> +privileges.
> +
> +libxl can assume a backend of a specific type $TYPE is supported if:
> +- $QEMU/backends/$TYPE is existing in Xenstore
> +- or $QEMU/backends is not existing and $TYPE is one of:
> +  "console", "vkbd", "vfb", "qdisk", "qnic"
> -- 
> 2.6.6
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel

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Re: [PATCH v2] docs: add misc/qemu-backends.txt

[Juergen Gross]

On 11/04/16 15:04, Juergen Gross wrote:
> Document the interface between qemu and libxl regarding backends
> supported by qemu.
> 
> Signed-off-by: Juergen Gross <jgross@suse.com>

Anyone to commit this, please?


Juergen

> ---
> v2: - replace variable Xenstore path parts (<xyz>) with bash-like syntax
>       ($XYZ) as requested by Konrad Wilk
>     - add remark about de-privileged qemu as requested by Stefano
>       Stabellini
>     - add comma as suggested by Andrew Cooper
> ---
>  docs/misc/qemu-backends.txt | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>  create mode 100644 docs/misc/qemu-backends.txt
> 
> diff --git a/docs/misc/qemu-backends.txt b/docs/misc/qemu-backends.txt
> new file mode 100644
> index 0000000..b8e1799
> --- /dev/null
> +++ b/docs/misc/qemu-backends.txt
> @@ -0,0 +1,21 @@
> +In order to know whether qemu supports a specific backend type libxl
> +needs a way to obtain this information.
> +
> +As each qemu instance owns a path (named $QEMU from now on) in
> +Xenstore, the backend information is presented there. $QEMU is built
> +from the domain id where the qemu instance is running $BACKEND_DOM,
> +and the domain id of the target domain of the qemu process $DOMID:
> +
> +$QEMU = /local/domain/$BACKEND_DOM/device-model/$DOMID
> +
> +Before signalling qemu is running by writing "running" to $QEMU/state
> +qemu will create a Xenstore node for each supported backend under
> +$QEMU/backends with the backend type as name (e.g.  $QEMU/backends/qdisk
> +for the qdisk backend). In case qemu is running de-privileged (not as
> +user root) the backend nodes must be written before qemu is dropping
> +privileges.
> +
> +libxl can assume a backend of a specific type $TYPE is supported if:
> +- $QEMU/backends/$TYPE is existing in Xenstore
> +- or $QEMU/backends is not existing and $TYPE is one of:
> +  "console", "vkbd", "vfb", "qdisk", "qnic"
> 


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Re: [PATCH v2] docs: add misc/qemu-backends.txt

[Wei Liu]

On Tue, Apr 12, 2016 at 03:03:15PM +0100, Wei Liu wrote:
> On Mon, Apr 11, 2016 at 03:04:09PM +0200, Juergen Gross wrote:
> > Document the interface between qemu and libxl regarding backends
> > supported by qemu.
> > 
> > Signed-off-by: Juergen Gross <jgross@suse.com>
> 
> Reviewed-by: Wei Liu <wei.liu2@citrix.com>
> 

Release-acked-by: Wei Liu <wei.liu2@citrix.com>

FAOD

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Re: [PATCH v2] docs: add misc/qemu-backends.txt

[Wei Liu]

On Wed, Apr 20, 2016 at 03:02:25PM +0100, Wei Liu wrote:
> On Tue, Apr 12, 2016 at 03:03:15PM +0100, Wei Liu wrote:
> > On Mon, Apr 11, 2016 at 03:04:09PM +0200, Juergen Gross wrote:
> > > Document the interface between qemu and libxl regarding backends
> > > supported by qemu.
> > > 
> > > Signed-off-by: Juergen Gross <jgross@suse.com>
> > 
> > Reviewed-by: Wei Liu <wei.liu2@citrix.com>
> > 
> 
> Release-acked-by: Wei Liu <wei.liu2@citrix.com>
> 
> FAOD

Applied.

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