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

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

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.

~Andrew

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