Re: [Xen-users] Guest OS changes for Paravirtualization

[Juergen Gross <jgross@xxxxxxxx>]

On 02/03/17 11:29, Charles Gonçalves wrote:
> One more question:
> 
> So, despite my guest VM is running it's not using the paravirtualization
> functions that would optimize the I/O operations, right?

If it is running in PV mode it is using paravirtualized I/O.

In HVM mode it will use paravirtualized I/O if the drivers in the guest
are active (I assume this is the case as the guest is capable to run in
PV mode, too).


Juergen

> 
> Thanks Juergen,
> 
> 
> Em qui, 2 de mar de 2017 07:20, Juergen Gross <jgross@xxxxxxxx
> <mailto:jgross@xxxxxxxx>> escreveu:
> 
>     On 02/03/17 11:07, Charles Gonçalves wrote:
>     > Paravirtualization needs changes on the OS guest accordingly xen wiki.
>     >
>     >  - Does someone know which changes is needed?
> 
>     The most important changes are:
> 
>     - different boot interface
>     - paravirtualized memory management
>     - paravirtualized interrupt handling
>     - no usage of "legacy" hardware and features (e.g. BIOS functions, x86
>       IN/OUT instructions, ...)
> 
>     >  - if I install a guest OS using hvm and switch for Paravirtualization
>     > the guest still run OK, why?
> 
>     The guest is probably a modern Linux. The Linux kernel supports running
>     either native (includes hvm) or paravirtualized.
> 
> 
>     Juergen
> 
> -- 
> Charles F.'. Gonçalves


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