[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Configuration of nestedhvm


  • To: "Dong, Eddie" <eddie.dong@xxxxxxxxx>
  • From: Keir Fraser <keir@xxxxxxx>
  • Date: Fri, 08 Oct 2010 09:22:44 +0100
  • Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 08 Oct 2010 01:23:51 -0700
  • Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:user-agent:date:subject:from:to:cc:message-id:thread-topic :thread-index:in-reply-to:mime-version:content-type :content-transfer-encoding; b=XK5mAkyW07daQObSFWE/leXzKis7YXfnFnGisXu74MflL4s0LXMOcZktH2tiaPfvXD dhJxfxobKHvcZVh8Mmc5BZ3RK7sxF5q9dhY4N6UFqDZ1RHrg8jbsarVjU/mWithKWof6 bLg6xBj5sEq11hel73R402xmFixtOFY3S1gqA=
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Actmf7Fhjj9F1X8UQAiSevQQTVQBcAAIcuFwAAWnxlYAAUz7IAABKtVv
  • Thread-topic: [Xen-devel] Configuration of nestedhvm

On 08/10/2010 08:56, "Dong, Eddie" <eddie.dong@xxxxxxxxx> wrote:

>> What's the point when a per-domain config option is going to be
>> implemented? You can then simply not configure nestedhvm for a domain
>> you want to test without that capability? I suppose it makes your
>> second patch make a bit more sense than it would in total isolation.
> 
> I want double-lock (AND) like other components such as IOMMU.
> If the global switch is off, even per domain configuration is turned on, the
> final effect is "OFF".
> 
> The point here is to avoid manual mistake when the nested code is built in as
> formal release but targeting for pilot. Relying on HVM guest configuration
> only may cause the host crash or performance impact if the code has a bug and
> a guest enables nested virtualization feature.
> 
> This switch is mainly for developer only at least for now.

Well, at least it should only be disallowing toolstack to set the per-domain
config option. Then it won't need to be accessed on every use of
is_nestedhvm(). So again it depends on that, mainly tool-side, patch.

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel


 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.