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doc: Clarify /dev/kvm setup.

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Reported by myglc2 <myglc2@gmail.com>.

* doc/guix.texi (Build Environment Setup): Mention the "kvm" group.
(Invoking guix system): Use "@quotation Note" for the note about KVM;
make it clear that KVM is optional.
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Ludovic Courtès 2016-06-26 12:16:07 +02:00
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1 changed files with 13 additions and 6 deletions
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doc/guix.texi
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@ -708,8 +708,13 @@ Bash syntax and the @code{shadow} commands):
@noindent @noindent
The number of build users determines how many build jobs may run in The number of build users determines how many build jobs may run in
parallel, as specified by the @option{--max-jobs} option parallel, as specified by the @option{--max-jobs} option
(@pxref{Invoking guix-daemon, @option{--max-jobs}}). The (@pxref{Invoking guix-daemon, @option{--max-jobs}}). To use
@code{guix-daemon} program may then be run as @code{root} with the @command{guix system vm} and related commands, you may need to add the
build users to the @code{kvm} group so they can access @file{/dev/kvm},
using @code{-G guixbuild,kvm} instead of @code{-G guixbuild}
(@pxref{Invoking guix system}).
The @code{guix-daemon} program may then be run as @code{root} with the
following command@footnote{If your machine uses the systemd init system, following command@footnote{If your machine uses the systemd init system,
dropping the @file{@var{prefix}/lib/systemd/system/guix-daemon.service} dropping the @file{@var{prefix}/lib/systemd/system/guix-daemon.service}
file in @file{/etc/systemd/system} will ensure that file in @file{/etc/systemd/system} will ensure that
@ -10224,12 +10229,14 @@ a list of available debugging commands.
@end table @end table
@end table @end table
Note that all the actions above, except @code{build} and @code{init}, @quotation Note
rely on KVM support in the Linux-Libre kernel. Specifically, the All the actions above, except @code{build} and @code{init},
machine should have hardware virtualization support, the corresponding 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 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 must exist and be readable and writable by the user and by the
build users of the daemon. build users of the daemon (@pxref{Build Environment Setup}).
@end quotation
Once you have built, configured, re-configured, and re-re-configured Once you have built, configured, re-configured, and re-re-configured
your GuixSD installation, you may find it useful to list the operating your GuixSD installation, you may find it useful to list the operating