The controls for cpu-bugs were ultimately not taken. As the paths are
documented fully below, pick only a small subset for the example. Include
cpupool/ as it exists now.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Make /cpupool/<id>/sched-gran in hypfs writable. This will enable per
cpupool selectable scheduling granularity.
Writing this node is allowed only with no cpu assigned to the cpupool.
Allowed are values "cpu", "core" and "socket".
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Dario Faggioli <dfaggioli@suse.com>
Add a "sched-gran" entry to the per-cpupool hypfs directories.
For now make this entry read-only and let it contain one of the
strings "cpu", "core" or "socket".
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Dario Faggioli <dfaggioli@suse.com>
Add /cpupool/<cpupool-id> directories to hypfs. Those are completely
dynamic, so the related hypfs access functions need to be implemented.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Dario Faggioli <dfaggioli@suse.com>
In docs/misc/hypfs-paths.pandoc the supported paths in the hypervisor
file system are specified. Make it more clear that path availability
might change, e.g. due to scope widening or narrowing (e.g. being
limited to a specific architecture).
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Release-acked-by: Paul Durrant <paul@xen.org>
Add support to read and modify values of hypervisor runtime parameters
via the hypervisor file system.
As runtime parameters can be modified via a sysctl, too, this path has
to take the hypfs rw_lock as writer.
For custom runtime parameters the connection between the parameter
value and the file system is done via an init function which will set
the initial value (if needed) and the leaf properties.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>
Add the /buildinfo/config entry to the hypervisor filesystem. This
entry contains the .config file used to build the hypervisor.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Provide version and compile information in /buildinfo/ node of the
Xen hypervisor file system. As this information is accessible by dom0
only no additional security problem arises.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
On the 2019 Xen developer summit there was agreement that the Xen
hypervisor should gain support for a hierarchical name-value store
similar to the Linux kernel's sysfs.
In the beginning there should only be basic support: entries can be
added from the hypervisor itself only, there is a simple hypercall
interface to read the data.
Add a feature document for setting the base of a discussion regarding
the desired functionality and the entries to add.
Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>
Andrew Cooper