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Re: GNU Mach: in user-mode?

From: Samuel Thibault
Subject: Re: GNU Mach: in user-mode?
Date: Fri, 5 Jun 2009 17:13:59 +0200
User-agent: Mutt/1.5.12-2006-07-14

Ivan Shmakov, le Fri 05 Jun 2009 22:01:26 +0700, a écrit :
>  >> * The time and qualification necessary to deploy one or more
>  >> GNU/Linux systems on a single host using User-Mode Linux is (to my
>  >> experience) significantly lower than for the other solutions (KVM,
>  >> Xen)
>  > For Xen I agree.  For KVM, I don't.  Building a UML image is not
>  > particularly easier than building a KVM image.
>       I've implied using rootstrap to build an image.

And you can use debootstrap to build a debian image.  There is no
fundamental difference here.

>  >> * Running User-Mode Linux doesn't imply any privileged user
>  >> intervention (contrary to both KVM and Xen)
>  > KVM doesn't either.
>       Nevertheless, it depends on access to /dev/kvm, which is a
>       privilege.

Oh, I thought it was given to any user.  So they still fear security

>       There're more differences between UML and KVM.  Consider, e. g.,
>       the inability to run KVM under KVM

Not that I particularly care :)

>       However, what bothers me the most, is the use of hardware
>       emulation, leading to:

That, however, is a valid point yes.  That's also one of the reason why
I prefer running Mach in Xen than in KVM.


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