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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-10232) SystemVMs and VR to run as HVM on XenServer
Date Wed, 02 May 2018 09:34:00 GMT


ASF GitHub Bot commented on CLOUDSTACK-10232:

rhtyd commented on a change in pull request #2465: CLOUDSTACK-10232: SystemVMs and VR to run
as HVM on XenServer

 File path: systemvm/debian/opt/cloud/bin/setup/cloud-early-config
 @@ -64,10 +71,17 @@ config_guest() {
 get_boot_params() {
   case $HYPERVISOR in
-     xen-domU|xen-hvm)
+     xen-pv)
           cat /proc/cmdline > $CMDLINE
           sed -i "s/%/ /g" $CMDLINE
+     xen-hvm)
+          if [ ! -f /usr/sbin/xenstore-read ]; then
+            log_it "ERROR: xentools not installed, cannot found xenstore-read" &&
exit 5
+          fi
+          /usr/sbin/xenstore-read vm-data/cloudstack/init > /var/cache/cloud/cmdline
 Review comment:
   @khos2ow in 4.11 systemvmtemplate, the xenstore-read is at /usr/bin, can you check/comment
why /usr/sbin was used? I've however, fixed this blocker in the stabilization PR:

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> SystemVMs and VR to run as HVM on XenServer
> -------------------------------------------
>                 Key: CLOUDSTACK-10232
>                 URL:
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: SystemVM, Virtual Router, XenServer
>    Affects Versions:,
>            Reporter: Pierre-Luc Dion
>            Priority: Major
> Following the recent Meltdown-Spectre security risk,one of the mitigation,as of Jan 2018,
for XenServer Hypervisor is to run Virtual-Machine in HVM mode.
> Currently SystemVMs and Virtual-Routers run as PV on XenServer and the eth0 is configured
using {{/etc/init.d/cloud-early-config}} using grub params from {{/proc/cmdline}}. When VM
run as HVM, it is not possible to push initial boot instruction via pygrub.
> Quick tests has been done using xenstore and it look like it would be possible to send
same initial boot instruction has pygrub but using xenstore for HVM instances.

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