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| author | Dietmar Hahn <dietmar.hahn@ts.fujitsu.com> | 2012-04-27 11:09:26 +0200 |
|---|---|---|
| committer | Dietmar Hahn <dietmar.hahn@ts.fujitsu.com> | 2012-04-27 11:09:26 +0200 |
| commit | f9adab4cc952b64433afdec151f84cc05f5168ee (patch) | |
| tree | 3e6cab23956138d93fa78efc71b3603e15400123 /docs/misc/xen-command-line.markdown | |
| parent | 4a831010c83e2229b2dadf4f5027d12e2cc4d5f6 (diff) | |
| download | xen-f9adab4cc952b64433afdec151f84cc05f5168ee.tar.gz xen-f9adab4cc952b64433afdec151f84cc05f5168ee.tar.bz2 xen-f9adab4cc952b64433afdec151f84cc05f5168ee.zip | |
docs: add vpmu description to xen-command-line.markdown
Add a short description to the vpmu boot option in the
xen-command-line.markdown
Signed-off-by: Dietmar Hahn <dietmar.hahn@ts.fujitsu.com>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Diffstat (limited to 'docs/misc/xen-command-line.markdown')
| -rw-r--r-- | docs/misc/xen-command-line.markdown | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown index a6195f207e..1f3faaa6de 100644 --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -543,7 +543,28 @@ console even after dom0 has been started. The default behaviour is to relinquish control to dom0. ### vpid + ### vpmu +> `= ( bts )` + +> Default: `off` + +Switch on the virtualized performance monitoring unit for HVM guests. + +If the current cpu isn't supported a message like +'VPMU: Initialization failed. ...' +is printed on the hypervisor serial log. + +For some Intel Nehalem processors a quirk handling exist for an unknown +wrong behaviour (see handle_pmc_quirk()). + +If 'vpmu=bts' is specified the virtualisation of the Branch Trace Store (BTS) +feature is switched on on Intel processors supporting this feature. + +*Warning:* +As the BTS virtualisation is not 100% safe and because of the nehalem quirk +don't use the vpmu flag on production systems with Intel cpus! + ### vti\_vhpt\_size ### vti\_vtlb\_size ### watchdog |