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doc: Recommend virtio-blk to access the VM image.

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* doc/guix.texi (Running Guix in a VM): Recommend virtio-blk to access
the image.
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Ludovic Courtès 2019-04-27 10:09:27 +02:00
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doc/guix.texi
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@ -24647,7 +24647,9 @@ vm-image} on x86_64 hardware:
@example @example
$ qemu-system-x86_64 \ $ qemu-system-x86_64 \
-net user -net nic,model=virtio \ -net user -net nic,model=virtio \
-enable-kvm -m 512 /tmp/qemu-image -enable-kvm -m 512 \
-device virtio-blk,drive=myhd \
-drive if=none,file=/tmp/qemu-image,id=myhd
@end example @end example
Here is what each of these options means: Here is what each of these options means:
@ -24677,8 +24679,15 @@ faster.
RAM available to the guest OS, in mebibytes. Defaults to 128@tie{}MiB, RAM available to the guest OS, in mebibytes. Defaults to 128@tie{}MiB,
which may be insufficient for some operations. which may be insufficient for some operations.
@item /tmp/qemu-image @item -device virtio-blk,drive=myhd
The file name of the qcow2 image. Create a @code{virtio-blk} drive called ``myhd''. @code{virtio-blk} is a
``paravirtualization'' mechanism for block devices that allows QEMU to achieve
better performance than if it were emulating a complete disk drive. See the
QEMU and KVM documentation for more info.
@item -drive if=none,file=/tmp/qemu-image,id=myhd
Use our QCOW image, the @file{/tmp/qemu-image} file, as the backing store the
the ``myhd'' drive.
@end table @end table
The default @command{run-vm.sh} script that is returned by an invocation of The default @command{run-vm.sh} script that is returned by an invocation of