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-370807868
   @rafaelweingartner  for the load test, I want to make sure that on a heavily 
loaded xenserver, will not affect data availability from xenstore at the 
creation of a VR. We are also running some benchmark on the VR between HVM and 
PV to see if moving to HVM will improve VR performance.
   @khos2ow,  in 4.11 systemvm is using Debian 9 correct ? if so, it's not what 
we are currently testing, we are currently focusing on the 4.10 template Debian 

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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:,
>            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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