Hi,
Thanks! Sorry. Yes. I meant kqemu.
Okay.. so would it be correct to say that kqemu formed the initial base of
what is now kvm/kvm_intel/kvm_amd and that the mods to qemu are necessary
for interfacing to the kernel drivers and possibly some paravirtualized
drivers for enhanced I/O performance?
Also.. when you say that kvm is part of the linux kernel do you mean
2.6.20 and above? Are the modules no longer necessary for the .20+
kernels?
I know your very busy. I really appreciate your taking the time to answer
my questions.
Thanks Again,
-G
Avi Kivity <[EMAIL PROTECTED]>
09/12/2007 04:04 AM
To
[EMAIL PROTECTED]
cc
kvm-devel <kvm-devel@lists.sourceforge.net>
Subject
Re: [kvm-devel] QEMU vs KVM
[EMAIL PROTECTED] wrote:
>
> Hello All,
>
> I am a bit unclear about the differences between QEMU and KVM. If I
> understand correctly, QEMU can run in a mode on an x86 where it
> executes user space code directly on the cpu without emulation. This
> seems to be very similar to what KVM is doing with the exception of
> using the virtualization capability of the cpu. I would think there
> would be very little difference in performance between the two in this
> case. Please forgive my ignorance, because I don't know that much
> about the new VT cpus yet. What is the actual difference / objective
> of the KVM project?
You're describing kqemu, not qemu.
Qemu is an emulator; it can emualte a large number of guests on a large
number of hosts, albeit at fairly slow speeds.
kqemu is a "qemu accelerator" which can be used to speed up qemu
emulation if the guest and host are the same.
kvm is a hardware virtualization system that is part of the Linux
kernel. While at present the only serious user is a modified qemu, it
is not tied to qemu. It is faster than either qemu of kqemu. The
downside is that it requires hardware virtualization extensions for
fully virtualized guests.
--
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