[Xen-devel] [PATCH v3 0/4] Support for reading runtime hypervisor parameters

Vasilis Liaskovitis posted 4 patches 40 weeks ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/xen tags/patchew/20190509154128.9196-1-vliaskovitis@suse.com
docs/man/xl.1.pod.in                |   5 ++
tools/flask/policy/modules/dom0.te  |   2 +-
tools/libxc/include/xenctrl.h       |   1 +
tools/libxc/xc_misc.c               |  26 +++++++
tools/libxl/libxl.c                 |  15 ++++
tools/libxl/libxl.h                 |   1 +
tools/xl/xl.h                       |   1 +
tools/xl/xl_cmdtable.c              |   5 ++
tools/xl/xl_misc.c                  |  25 ++++++
xen/common/kernel.c                 | 113 ++++++++++++++++++++++++++++
xen/common/sysctl.c                 |  52 ++++++++++++-
xen/include/public/sysctl.h         |  18 +++++
xen/include/xen/lib.h               |   1 +
xen/xsm/flask/hooks.c               |   3 +
xen/xsm/flask/policy/access_vectors |   2 +
15 files changed, 267 insertions(+), 3 deletions(-)

[Xen-devel] [PATCH v3 0/4] Support for reading runtime hypervisor parameters

Posted by Vasilis Liaskovitis 40 weeks ago
Currently runtime parameters of the hypervisor cannot be inspected through an
xl command, however they can be changed with the "xl set-parameter" command.
Being able to check these parameters at runtime would be a useful diagnostic
tool.

This patch series implements a new xl command "xl get-parameters"
which takes a string of input parameters and returns their current
values in the hypervisor settings.

Changes v2->v3:

- Several style / formatting fixes
- Limitations for signed integer parameters added in code and commit log.

Changes v1->v2:

- fixed snprintf issues, fixed memory leaks and error handling
- removed unnecessary wrapper function
- OPT_SIZE is handled

Limitations:

- Custom runtime parameters (OPT_CUSTOM) are not supported yet. I'd like
  to do this in a follow-up series. See also discussion at
  https://lists.xenproject.org/archives/html/xen-devel/2019-03/msg01383.html
- For integer parameters (OPT_UINT), only unsigned parameters are printed
  correctly at the moment.

Examples:

xl get-parameters "gnttab_max_frames gnttab_max_maptrack_frames"
gnttab_max_frames gnttab_max_maptrack_frames : 64 1024

xl set-parameters gnttab_max_frames=128

xl get-parameters gnttab_max_frames
gnttab_max_frames : 128

xl get-parameters "gnttab_max_frames gnttab_max_maptrack_frames"
gnttab_max_frames gnttab_max_maptrack_frames : 128 1024

Vasilis Liaskovitis (4):
  xen: add hypercall for getting parameters at runtime
  libxc: add function to get hypervisor parameters
  libxl: add libxl_get_parameters() function
  xl: add new xl command get-parameters

 docs/man/xl.1.pod.in                |   5 ++
 tools/flask/policy/modules/dom0.te  |   2 +-
 tools/libxc/include/xenctrl.h       |   1 +
 tools/libxc/xc_misc.c               |  26 +++++++
 tools/libxl/libxl.c                 |  15 ++++
 tools/libxl/libxl.h                 |   1 +
 tools/xl/xl.h                       |   1 +
 tools/xl/xl_cmdtable.c              |   5 ++
 tools/xl/xl_misc.c                  |  25 ++++++
 xen/common/kernel.c                 | 113 ++++++++++++++++++++++++++++
 xen/common/sysctl.c                 |  52 ++++++++++++-
 xen/include/public/sysctl.h         |  18 +++++
 xen/include/xen/lib.h               |   1 +
 xen/xsm/flask/hooks.c               |   3 +
 xen/xsm/flask/policy/access_vectors |   2 +
 15 files changed, 267 insertions(+), 3 deletions(-)

-- 
2.20.1


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