Re: [QUERY] lguest64

From: Ramkumar Ramachandra
Date: Thu Aug 01 2013 - 13:22:47 EST

H. Peter Anvin wrote:
> UML, lguest and Xen were done before the x86 architecture supported
> hardware virtualization.


> but on KVM-enabled hardware KVM seems
> like the better option (and is indeed what libguestfs uses.)

While we're still on the topic, I'd like a few clarifications. From
your reply, I got the impression that KVM the only mechanism for
non-pvops virtualization. This seems quite contrary to what I read on
lwn about ARM virtualization [1]. In short, ARM provides a "hypervisor
mode", and the article says

"the virtualization model provided by ARM fits the Xen
hypervisor-based virtualization better than KVM's kernel-based model"

The Xen people call this "ARM PVH" (as opposed to ARM PV, which does
not utilize hardware extensions) [2]. Although I wasn't able to find
much information about the hardware aspect, what ARM provides seems to
be quite different from VT-x and AMD-V. I'm also confused about what
virt/kvm/arm is.


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