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doc: Make /dev/kvm note more visible.

Suggested by Giovanni Biscuolo <g@xelera.eu>.

* doc/guix.texi (Invoking guix system): Move note about /dev/kvm access
to the beginning of the 'vm' action description.
snapper
Ludovic Courtès 3 years ago
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  1. 19
      doc/guix.texi

19
doc/guix.texi

@ -23008,6 +23008,16 @@ passed.
@anchor{guix system vm}
Build a virtual machine that contains the operating system declared in
@var{file}, and return a script to run that virtual machine (VM).
@quotation Note
The @code{vm} action and others below
can use KVM support in the Linux-libre kernel. Specifically, if the
machine has hardware virtualization support, the corresponding
KVM kernel module should be loaded, and the @file{/dev/kvm} device node
must exist and be readable and writable by the user and by the
build users of the daemon (@pxref{Build Environment Setup}).
@end quotation
Arguments given to the script are passed to QEMU as in the example
below, which enables networking and requests 1@tie{}GiB of RAM for the
emulated machine:
@ -23204,15 +23214,6 @@ a list of available debugging commands.
@end table
@end table
@quotation Note
All the actions above, except @code{build} and @code{init},
can use KVM support in the Linux-libre kernel. Specifically, if the
machine has hardware virtualization support, the corresponding
KVM kernel module should be loaded, and the @file{/dev/kvm} device node
must exist and be readable and writable by the user and by the
build users of the daemon (@pxref{Build Environment Setup}).
@end quotation
Once you have built, configured, re-configured, and re-re-configured
your GuixSD installation, you may find it useful to list the operating
system generations available on disk---and that you can choose from the

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