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Re: [Xen-users] Switch Hardware Virtualization On/Off

Yeah, never quite figured out why VT is off by default, but maybe those security concerns explain it.  It's one of the first things I enable since I need to run Xen + HVM.

As far as the pv_ops kernels go, it seems like you still have to run those instead an HVM, and it just uses more PV code in the HVM.  I haven't been able to get a pv_ops kernel to boot as a PV domU.


>>> On 2009/06/09 at 07:35, "Fajar A. Nugraha" <fajar@xxxxxxxxx> wrote:

On Tue, Jun 9, 2009 at 7:30 PM, Nick Couchman<Nick.Couchman@xxxxxxxxx> wrote:
> I think you're talking about two different technologies, here.  The CPU
> support for Virtualization Technology (VT) should be turned on and left on.
> There's absolutely no reason to turn it off

Some vendors seem to think otherwise, and ship servers with VT
disabled by default. Probably due to something like
http://www.securityfocus.com/columnists/451 , even if no real threat
currently exist.

> A guest can either
> run a PV kernel or a standard kernel.  If it runs a PV kernel, it is a PV
> domU, if it runs a standard kernel, it must be run inside an HVM domU.

Yeah, but the limit gets blurred with pv_ops kernel, where the same
kernel can be used for both :)


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