[uml-devel] UML Hardware Virt Support

[uml-devel] UML Hardware Virt Support

[Earlence Fernandes]

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The book (2004) states that work was going on for hardware assisted virt.
Has there been progress on it? Where do I find information on it?
The UML source tree still comes with the original modes of operation.

-Earlence

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Re: [uml-devel] UML Hardware Virt Support

[richard -rw- weinberger]

On Tue, Apr 30, 2013 at 6:12 PM, Earlence Fernandes
<earlenceferns@gmail.com> wrote:
> The book (2004) states that work was going on for hardware assisted virt.

I don't think so.

> Has there been progress on it? Where do I find information on it?
> The UML source tree still comes with the original modes of operation.

UML development mostly stopped in favor to KVM.

--
Thanks,
//richard

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Re: [uml-devel] UML Hardware Virt Support

[Earlence Fernandes]

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>UML development mostly stopped in favor to KVM.

so you mean to say that KVM is preferable to UML?
(I Guess it may depend on the situation?)

-Earlence


On Tue, Apr 30, 2013 at 12:17 PM, richard -rw- weinberger <
richard.weinberger@gmail.com> wrote:

> On Tue, Apr 30, 2013 at 6:12 PM, Earlence Fernandes
> <earlenceferns@gmail.com> wrote:
> > The book (2004) states that work was going on for hardware assisted virt.
>
> I don't think so.
>
> > Has there been progress on it? Where do I find information on it?
> > The UML source tree still comes with the original modes of operation.
>
> UML development mostly stopped in favor to KVM.
>
> --
> Thanks,
> //richard
>

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Re: [uml-devel] UML Hardware Virt Support

[Richard RW. Weinberger]

----- Ursprüngliche Mail -----
> 
> 
> > UML development mostly stopped in favor to KVM.
> 
> 
> so you mean to say that KVM is preferable to UML?
> (I Guess it may depend on the situation?)

KVM is *much* faster than UML and *much* less hacky. :-)

Thanks,
//richard

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Re: [uml-devel] UML Hardware Virt Support

[Earlence Fernandes]

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But then there's a fundamental question of whether KVM has similar
semantics.
UML was incredibly useful to my project since it ran a whole "kernel +
processes" in user space.
Now i'm confused as to whether I need to change my work so that it works
with KVM (I'm trying to read thru KVM docs to understand the semantics).

Basically, my project involved redirecting the system calls of one process
to the UML kernel.


On Tue, Apr 30, 2013 at 12:27 PM, Richard RW. Weinberger <
richard@sigma-star.at> wrote:

> ----- Ursprüngliche Mail -----
> >
> >
> > > UML development mostly stopped in favor to KVM.
> >
> >
> > so you mean to say that KVM is preferable to UML?
> > (I Guess it may depend on the situation?)
>
> KVM is *much* faster than UML and *much* less hacky. :-)
>
> Thanks,
> //richard
>

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Re: [uml-devel] UML Hardware Virt Support

[richard -rw- weinberger]

On Tue, Apr 30, 2013 at 6:49 PM, Earlence Fernandes
<earlenceferns@gmail.com> wrote:
> But then there's a fundamental question of whether KVM has similar
> semantics.

KVM works completely different than UML does.

> UML was incredibly useful to my project since it ran a whole "kernel +
> processes" in user space.
> Now i'm confused as to whether I need to change my work so that it works
> with KVM (I'm trying to read thru KVM docs to understand the semantics).

You can still use UML, it is functional.

--
Thanks,
//richard

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Re: [uml-devel] UML Hardware Virt Support

[Terry Hsu]

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On Tue, Apr 30, 2013 at 12:27 PM, Richard RW. Weinberger <
richard@sigma-star.at> wrote:

> ----- Ursprüngliche Mail -----
> >
> >
> > > UML development mostly stopped in favor to KVM.
> >
> >
> > so you mean to say that KVM is preferable to UML?
> > (I Guess it may depend on the situation?)
>
> KVM is *much* faster than UML and *much* less hacky. :-)
>
>
Indeed, I am developing some functions for the virtual memory subsystem in
the kernel.
Qemu replaces UML in my case. I run qemu without kvm support because I
don't seem to be able to run nested virtualization in virtualbox.
Anyway now Qemu serves me well. :)

Is Jeff Dike still developing UML?


>  Thanks,
> //richard
>
>
> ------------------------------------------------------------------------------
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Re: [uml-devel] UML Hardware Virt Support

[richard -rw- weinberger]

On Wed, May 1, 2013 at 7:54 PM, Terry Hsu <terry.shoes@gmail.com> wrote:
> Indeed, I am developing some functions for the virtual memory subsystem in
> the kernel.
> Qemu replaces UML in my case. I run qemu without kvm support because I don't
> seem to be able to run nested virtualization in virtualbox.
> Anyway now Qemu serves me well. :)
>
> Is Jeff Dike still developing UML?

Not really. Just use git to find out. :)

Currently I maintain UML in my very limited spare time.
Al Viro also often helps hunting bugs down.

So, don't expect much new features coming to UML.
But I try hard to keep it running.

--
Thanks,
//richard

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Re: [uml-devel] UML Hardware Virt Support

[Terry Hsu]

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Great to know this, thanks for keeping it up!



On Wed, May 1, 2013 at 2:15 PM, richard -rw- weinberger <
richard.weinberger@gmail.com> wrote:

> On Wed, May 1, 2013 at 7:54 PM, Terry Hsu <terry.shoes@gmail.com> wrote:
> > Indeed, I am developing some functions for the virtual memory subsystem
> in
> > the kernel.
> > Qemu replaces UML in my case. I run qemu without kvm support because I
> don't
> > seem to be able to run nested virtualization in virtualbox.
> > Anyway now Qemu serves me well. :)
> >
> > Is Jeff Dike still developing UML?
>
> Not really. Just use git to find out. :)
>
> Currently I maintain UML in my very limited spare time.
> Al Viro also often helps hunting bugs down.
>
> So, don't expect much new features coming to UML.
> But I try hard to keep it running.
>
> --
> Thanks,
> //richard
>

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