Re: Xen as L1 support

[Gleb Natapov <gleb@redhat.com>]

On Wed, May 15, 2013 at 07:43:25PM +0200, Jan Kiszka wrote:
> On 2013-05-15 16:59, Paolo Bonzini wrote:
> > Il 15/05/2013 03:24, Ren, Yongjie ha scritto:
> >>> -----Original Message-----
> >>> From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org]
> >>> On Behalf Of Alex Palesandro
> >>> Sent: Tuesday, May 14, 2013 10:51 PM
> >>> To: kvm@vger.kernel.org
> >>> Subject: Fwd: Xen as L1 support
> >>>
> >>> Hi,
> >>> I'm new to KVM. I'm doing some test on nested Virtualization with Xen
> >>> and KVM. I tried to test the Xen hypervisor as L1 over KVM ( Linux
> >>> 3.9.0) and I found this in
> >>> "xm dmesg" log ( for the complete log, see the attached file).
> >>> --------------------------------------------
> >>> (XEN) VMX: CPU0 has insufficent VMExit Control (00036fff but requires
> >>> min 00008200)
> >>> (XEN) VMX: failed to initialise.
> >>> --------------------------------------------
> > 
> > This is the "Acknowledge interrupt on exit" control.  It shouldn't be
> > hard to implement it.
> 
> Isn't this a pretty recent feature Xen should be able to live without -
> if it finds itself on a (virtually) older CPU?
> 
IIRC the feature was always there. KVM started to use it only from 3.10 since
posted interrupt requires it.

--
			Gleb.