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Re: [Xen-devel] Questions about PVH in Xen 4.3 unstable

I thought that stubdoms for HVMs are great for security. Can it still be used for PV-on-HVM for security? Can only Linux run as PVH and Windows and so on still run as HVM?

2013/1/30 Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
tech mailinglists, le Wed 30 Jan 2013 11:33:23 +0100, a écrit :
> Actually I am running 4.2.1 with Linux 3.7.4 with Debian Squeeze as Dom0. For
> the HVM guests I am using ioemu stubdoms. When I understood PVH correctly it
> implements that what actually is done with PV drivers on HVM guests as a
> aggregated and seperate guest type.

It's more than that. The guest does not need ioemu at all.

> And does PVHs can get use of stubdoms?

And thus PVH have no use for stubdoms, since there is no ioemu to
execute in there.

> I am a little bit confused about a text I read that stubdoms are not needed for
> HVM guests which have PV drivers installed,

Ioemu is still needed for those domains, but running it in a stubdom
won't bring more performance, since what matters for performance will
not go through ioemu, when PV drivers are installed.

> is this correct or can a HVM guest always make use of stubdoms?

HVM can always make use of stubdoms to execute ioemu, but that won't
improve performance. It could improve early boot time, at best.


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