Re: [Xen-users] dom0=pvh and 4.18

[Juergen Gross <jgross@xxxxxxxx>]

On 14/08/18 01:31, Glenn Enright wrote:
> HI there
> 
> A I understand it, pvh is faster, and it also has the benefit of not
> using qemu, so code is much simpler.

The main advantage of PVH is a much simpler interface between guest
(in this case dom0) and the hypervisor. This is reducing the attack
surface of the whole system. Another advantage is that the guest doesn't
need to support the PV interface, which is rather intrusive in the guest
OS.

PVH is faster for some workloads, for others PV is faster. Especially
for dom0 there are still some known performance issues when running
in PVH mode, e.g. for domain creation and backend functionality.

Not using qemu is true for PV, too. And dom0 can't make use of qemu, of
course, as there is no instance qemu could run in when dom0 is booting.


Juergen

> 
> https://www.serverwatch.com/server-news/xen-4.11-improves-server-virtualization-with-pvh.html
> 
> Regards, Glenn
> http://ri.mu - Startups start here.
> Hosting, Email, DNS, Offsite Backups, Monitoring.
> 
> On 13/08/18 19:22, Christoph wrote:
>> Hi,
>>
>> what are the advantages of a pvh dom0?
>>
>> Am 2018-08-13 02:31, schrieb Glenn Enright:
>>> Hi all,
>>>
>>> Doing some testing with 4.18 kernel, trying to get dom0=pvh working
>>> with xen4.11.
>>>
>>> Builds are from my own test machine, with a gcc8.0 toolchain for
>>> centos6. Test machine is a Supermicro X9 board with Dual E52630v2
>>> cpus.
>>>
>>> What I'm seeing is that xen boots up fine, but on the transition to
>>> the linux kernel, the screen goes blank and the server never pings.
>>> I've tried a bunch of different command line options including various
>>> console/serial with no change.
>>>
>>> Does anyone have a magical set of xen boot options that could help get
>>> me started or at least show something to point the way?
>>>
>>> Thanks
>>> --Glenn
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@xxxxxxxxxxxxxxxxxxxx
>>> https://lists.xenproject.org/mailman/listinfo/xen-users
>>
> 
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