Clarify 'xm mem-set' and 'xm vcpu-set' requirements in documentation.

From: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/docs/man/xm.pod.1 b/docs/man/xm.pod.1
index 0195736e26..74b58dbf14 100644
--- a/docs/man/xm.pod.1
+++ b/docs/man/xm.pod.1
@@ -254,9 +254,12 @@ domain, as it may balloon down its memory to give more back to the OS.
 
 =item B<mem-set> I<domain-id> I<mem>
 
-Set the domain's used memory using the balloon driver.  Because this
-operation requires cooperation from the domain operating system, there
-is no guarantee that it will succeed.
+Set the domain's used memory using the balloon driver.
+
+Because this operation requires cooperation from the domain operating
+system, there is no guarantee that it will succeed.  This command will
+definitely not work unless the domain has the required paravirt
+driver.
 
 B<Warning:> There is no good way to know in advance how small of a
 mem-set will make a domain unstable and cause it to crash.  Be very
@@ -392,6 +395,10 @@ Attempting to set the VCPUs to a number larger than the initially
 configured VCPU count is an error.  Trying to set VCPUs to < 1 will be
 quietly ignored.
 
+Because this operation requires cooperation from the domain operating
+system, there is no guarantee that it will succeed.  This command will
+not work with a full virt domain.
+
 =item B<vcpu-list> [I<domain-id>]
 
 Lists VCPU information for a specific domain.  If no domain is