Le 24/03/2021 à 03:12, Victor Sudakov a écrit :
The relation between qemu and kvm confuses me. "apt install qemu-kvm" is
trying to install a ton of X11 packages including Mesa drivers etc, I
would not really want that. And "apt install kvm" does not find such a
package.
QEMU/KVM relationship:
as I see it (but someone with a real understanding of the subject -that
I do not have- could be horrified by what I say):
- KVM is roughly a Linux(-only) kernel module that permits the use the
Linux Kernel as the basis of an hypervisor and the access to hardware
acceleration. But it is not by itself a whole virtualization solution
- QEMU is a multi-platform virtualization solution that does not require
hardware acceleration and does not by itseelf provide a way to use this
acceleration. In the past many accelerators had been available
- today a common way to virtualize a guest in a linux host is to use
Qemu with the KVM kernel module (and invoking KVM is really invoking Qemu)
more (and more pertinent) info here:
https://en.wikipedia.org/wiki/QEMU
https://en.wikipedia.org/wiki/Kernel-based_Virtual_Machine
QEMU/X11 relationship:
- I do not really know how to install Qemu without X11 nor if it
possible without the loss of CLI features. Possible solutions could be
to install packages with the "without recommended" option, to forbid
installation of packages by establishing preferences (cf apt_preferences
manpage). A possible culprit is qemu-system-gui and you could forbid its
installation. I do not know if running Qemu immplies that a X11 server
is running or simply installed
- the Qemu package in Debian is an all-architectures one: if you want to
emulate/virtualize only X86/X86_64 hardware, qemu-systemx-86 is sufficient
- if you do not want to install X11 and can not avoid it with Qemu,
perhaps you could look at Xen. I do not know if it could be of interest
in your case. My opinion (but I am not knowledgeable on this) is that
Xen is perhaps more modular than Qemu but with an added (to me at least)
complexity. Another element: I seem to recall that Xen is welle
used/known is the NetBSD world and that could translate in your FreeBSD
approach?
https://www.linux-kvm.org/page/Virtio
This is also confusing, as the document is written about kvm but cites
qemu as an example.
see above :-)
