x86/vPMU: document as unsupported

This is XSA-163.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown
index afb9548cf13c1e139538ac43a25cdedf6a9f86bf..c103894e486082678123067edad1044edd3b617f 100644 (file)
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -1474,8 +1474,8 @@ feature is switched on on Intel processors supporting this feature.
 Note that if **watchdog** option is also specified vpmu will be turned off.
 
 *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!
+As the virtualisation is not 100% safe, don't use the vpmu flag on
+production systems (see http://xenbits.xen.org/xsa/advisory-163.html)!
 
 ### watchdog
 > `= force | <boolean>`