Re: [Xen-devel] Xen / EC2 network HVM device visibility

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxx] On Behalf Of Andrew Cooper
> Sent: 30 September 2015 10:11
> To: Andrew Stuart; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Xen / EC2 network HVM device visibility
> 
> On 30/09/15 06:25, Andrew Stuart wrote:
> > As far as I can tell, Xen HVM domu guests detect and use the RTL8139
> network card thus its not a hard requirement to use the PVHVM drivers.
> 
> The rtl8139 (or e1000e, depending on configuration) are provided to HVM
> guests to cater to a Xen unaware configuration.
> 
> It is expected that any Xen aware operating system use xen-netfront
> instead.
> 
> >
> > On EC2 however, am I right in understanding that although EC2 is using Xen
> HVM, the RTL8139 network device is not available and therefore to get
> networking it is a requirement for PVHVM drivers?
> 
> As part of booting and being Xen aware, there is a handover to disable
> the emulated card, to avoid the VM having two network interfaces on the
> same bridge with the same mac address.  If you instruct your VM to boot
> without enabling any Xen PV drivers, you will likely still find an
> emulated card visible.
>

I believe AWS VMs are not configured with an emulated network so a PV frontend 
is required.

  Paul

 
> ~Andrew
> 
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