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https://issues.apache.org/jira/browse/CLOUDSTACK-10232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373526#comment-16373526
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ASF GitHub Bot commented on CLOUDSTACK-10232:
---------------------------------------------

pdion891 commented on issue #2465: CLOUDSTACK-10232: SystemVMs and VR to run as 
HVM on XenServer
URL: https://github.com/apache/cloudstack/pull/2465#issuecomment-367834144
 
 
   BTW we are doing some test of this on our side, to make sure we keep support 
of VR running as PV on legacy deployments and support now default HVM VR on 
xenserver 7.1+...
   
   So far the xenstore method work well but still need few tests under high 
workload, VR reboot, reset,...  we should have more news in a week, our QA will 
only focus on xenserver 7.1 including 7.1.1(cumulative updates)
   
   

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> SystemVMs and VR to run as HVM on XenServer
> -------------------------------------------
>
>                 Key: CLOUDSTACK-10232
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-10232
>             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: 4.10.0.0, 4.9.3.0
>            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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