From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Andrew Stuart <andrew.stuart@supercoders.com.au>,
xen-devel@lists.xen.org
Subject: Re: Xen / EC2 network HVM device visibility
Date: Wed, 30 Sep 2015 10:11:13 +0100 [thread overview]
Message-ID: <560BA731.1090300@citrix.com> (raw)
In-Reply-To: <2CDE7D7D-3862-4BE5-A4AF-95C192701975@supercoders.com.au>
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
next prev parent reply other threads:[~2015-09-30 9:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-30 5:25 Xen / EC2 network HVM device visibility Andrew Stuart
2015-09-30 9:09 ` Ian Campbell
2015-09-30 9:10 ` Wei Liu
2015-09-30 9:11 ` Andrew Cooper [this message]
2015-09-30 9:14 ` Paul Durrant
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