[PATCH for-4.7] docs: update xl manpage about {block, network}-attach command

[Wei Liu <wei.liu2@citrix.com>]

State that only attaching PV interface is supported.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
It's probably safe to claim the same for other device types, but I will just
stick with the ones I tested at this stage of the release.

Cc: Ian Jackson <ian.jackson@eu.citrix.com>
---
 docs/man/xl.pod.1 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/docs/man/xl.pod.1 b/docs/man/xl.pod.1
index 9887f1b..290d8ed 100644
--- a/docs/man/xl.pod.1
+++ b/docs/man/xl.pod.1
@@ -1284,7 +1284,8 @@ effect to the guest OS is much the same as any hotplug event.
 =item B<block-attach> I<domain-id> I<disc-spec-component(s)> ...
 
 Create a new virtual block device.  This will trigger a hotplug event
-for the guest.
+for the guest. Note that only attaching PV block device is supported,
+the B<vdev> field is ignored.
 
 B<OPTIONS>
 
@@ -1367,7 +1368,8 @@ Creates a new network device in the domain specified by I<domain-id>.
 I<network-device> describes the device to attach, using the same format as the
 B<vif> string in the domain config file. See L<xl.cfg> and
 L<http://xenbits.xen.org/docs/unstable/misc/xl-network-configuration.html>
-for more informations.
+for more informations. Note that only attaching PV network interface is
+supported.
 
 =item B<network-detach> I<domain-id> I<devid|mac>
 
-- 
2.1.4


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