Re: [Minios-devel] Some queries regarding Unikraft on x86/arm

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Hey Ajay,

On 04.04.2018 05:05, Ajay Garg wrote:
> Thanks Wei for the crisp reply !!
> Waiting for Simon's insights on Unikraft-x86 on Xen :)
>
> Thanks and Regards,
> Ajay
>
> On Wed, Apr 4, 2018 at 8:04 AM, Wei Chen <Wei.Chen@xxxxxxx 
> <mailto:Wei.Chen@xxxxxxx>> wrote:
>     Hi Ajay,____
>
>     __ __
>
>     > a) Unikraft (for arm32) is built using HVM mode, and will _only_
>     work with processors that have hardware-virtualization enabled,
>     right?____
>
>     __ __
>
>     Yes, that’s right. Currently, for arm32-unikraft, we plan to support
>     Xen and Linux/KVM.____
>
>     Both of them need hardware virtualization enabled processors.____
Correct. ;-)

>     __ __
>
>     > b) Unikraft (for x86) also uses HVM mode, and works _only_ with 
> processors that have hardware-virtualization enabled, right?____
>
>     > Or Unikraft works/can-work using PV mode?____
>
>     __ __
>
>     Unikraft-x86 of KVM platform uses HVM mode, it should require
>     hardware virtualization____
>
>     enabled processors. But it seems the Unikraft-x86 of Xen platform is
>     using PV-mode.____
>
>     I am not sure about it, but I think Simon could give you a clear
>     answer.____
Also correct. Unikraft on Xen is PV only, for now. We actually plan to 
support PVH/HVM on Xen in the future. These two modes also require 
hardware virtualization capabilities. Please note that there are patches 
for Xen's PV mode because of Meltdown which might also require 
virtualization capabilities on your CPU.
>     __ __
>
>     Regards,____
>
>     Wei Chen____
Thanks,

Simon

>     __ __
>
>     *From:*Minios-devel <minios-devel-bounces@xxxxxxxxxxxxxxxxxxxx
>     <mailto:minios-devel-bounces@xxxxxxxxxxxxxxxxxxxx>> *On Behalf Of
>     *Ajay Garg
>     *Sent:* 2018年4月3日19:17
>     *To:* minios-devel@xxxxxxxxxxxxxxxxxxxx
>     <mailto:minios-devel@xxxxxxxxxxxxxxxxxxxx>
>     *Subject:* [Minios-devel] Some queries regarding Unikraft on x86/arm____
>
>     __ __
>
>     Hi All.____
>
>     It's pretty clear that PV-guests on ARM are not the way to go
>     (neither there are any plans for support of PV-guests on ARM),
>     primarily because of the following reasons :____
>
>             * Too much complexity in OS code while booting up, and in
>     general.____
>
>             * Security issues (Meltdown).____
>
>     So, rumprun, as of now is unusable for ARM, because rumprun is built
>     with PV-guests in mind.____
>
>     So, that leaves us with Unikraft.
>     So, kindly confirm :____
>
>     __ __
>
>     a)____
>
>     Unikraft (for arm32) is built using HVM mode, and will _only_ work
>     with processors that have hardware-virtualization enabled, right?____
>
>     b)____
>
>     Unikraft (for x86) also uses HVM mode, and works _only_ with
>     processors that have hardware-virtualization enabled, right?____
>
>     Or Unikraft works/can-work using PV mode?____
>
>
>
>     I think with the above two resolutions, we can be sure to zero-in on
>     Unikraft for running unikernels.
>     __
>     ______
>
>     Many thanks to everyone who have helped, big thanks to Julien
>     (<julien.grall@xxxxxxx <mailto:julien.grall@xxxxxxx>>) !!____
>
>
>     ____
>
>     __ __
>
>     Thanks and Regards,
>     Ajay____
>
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>
>
> --
> Regards,
> Ajay
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