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Merge pull request #10 from chavafg/topic/qemu-config
qemu: Add script to generate hypervisor configure options.
This commit is contained in:
Sebastien Boeuf
GitHub
commit
2118e5f74b
393
scripts/configure-hypervisor.sh
Executable file
393
scripts/configure-hypervisor.sh
Executable file
@ -0,0 +1,393 @@
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#!/bin/bash
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#
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# Copyright (c) 2018 Intel Corporation
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#
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# SPDX-License-Identifier: Apache-2.0
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#---------------------------------------------------------------------
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# Description: This script is the *ONLY* place where "qemu*" build options
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# should be defined.
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#
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# Note to maintainers:
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#
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# XXX: Every option group *MUST* be documented explaining why it has
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# been specified.
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#---------------------------------------------------------------------
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script_name=${0##*/}
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typeset -A recognised_tags
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recognised_tags=(
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[arch]="architecture-specific"
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[functionality]="required functionality"
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[minimal]="specified to avoid building unnecessary elements"
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[misc]="miscellaneous"
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[security]="specified for security reasons"
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[size]="minimise binary size"
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[speed]="maximise startup speed"
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)
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# Display message to stderr and exit indicating script failed.
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die()
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{
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local msg="$*"
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echo >&2 "$script_name: ERROR: $msg"
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exit 1
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}
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# Display usage to stdout.
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usage()
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{
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cat <<EOT
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Overview:
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Display configure options required to build the specified
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hypervisor.
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Usage:
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$script_name [options] <hypervisor-name>
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Options:
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-d : Dump all options along with the tags explaining why each option
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is specified.
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-h : Display this help.
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-m : Display options one per line (includes continuation characters).
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Example:
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$ $script_name qemu-lite
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EOT
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}
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show_tags_header()
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{
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local keys
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local key
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local value
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cat <<EOT
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# Recognised option tags:
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#
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EOT
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# sort the tags
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keys=${!recognised_tags[@]}
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keys=$(echo "$keys"|tr ' ' '\n'|sort -u)
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for key in $keys
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do
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value="${recognised_tags[$key]}"
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printf "# %s\t%s.\n" "$key" "$value"
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done
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printf "#\n\n"
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}
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check_tag()
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{
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local tag="$1"
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local entry="$2"
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value="${recognised_tags[$tag]}"
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[ -n "$value" ] && return
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die "invalid tag '$tag' found for entry '$entry'"
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}
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check_tags()
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{
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local tags="$1"
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local entry="$2"
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[ -z "$tags" ] && die "entry '$entry' doesn't have any tags"
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tags=$(echo "$tags"|tr ',' '\n')
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for tag in $tags
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do
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check_tag "$tag" "$entry"
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done
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}
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# Display an array to stdout.
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#
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# If 2 arguments are specified, split array across multiple lines,
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# one per element with a backslash at the end of all lines except
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# the last.
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#
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# Arguments:
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#
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# $1: *Name* of array variable (no leading '$'!!)
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# $2: (optional) "multi" - show values across multiple lines,
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# "dump" - show full hash values. Any other value results in the
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# options being displayed on a single line.
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show_array()
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{
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local -n _array="$1"
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local action="$2"
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local -i size="${#_array[*]}"
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local -i i=1
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local entry
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local tags
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local elem
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local suffix
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local one_line="no"
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[ "$action" = "dump" ] && show_tags_header
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for entry in "${_array[@]}"
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do
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tags=$(echo "$entry"|cut -s -d: -f1)
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elem=$(echo "$entry"|cut -s -d: -f2-)
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check_tags "$tags" "$entry"
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if [ "$action" = "dump" ]
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then
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printf "%s\t\t%s\n" "$tags" "$elem"
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elif [ "$action" = "multi" ]
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then
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if [ $i -eq $size ]
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then
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suffix=""
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else
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suffix=" \\"
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fi
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printf '%s%s\n' "$elem" "$suffix"
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else
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one_line="yes"
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echo -n "$elem "
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fi
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i+=1
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done
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[ "$one_line" = yes ] && echo
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}
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# Entry point
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main()
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{
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arch=$(arch)
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# Array of configure options.
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#
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# Each element is comprised of two parts in the form:
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#
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# tags:option
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#
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# Where,
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#
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# - 'tags' is a comma-separated list of values which denote why
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# the option is being specified.
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#
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# - 'option' is the hypervisor configuration option.
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typeset -a qemu_options
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action=""
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while getopts "dhm" opt
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do
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case "$opt" in
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d)
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action="dump"
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;;
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h)
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usage
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exit 0
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;;
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m)
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action="multi"
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;;
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esac
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done
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shift $[$OPTIND-1]
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[ -z "$1" ] && die "need hypervisor name"
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hypervisor="$1"
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#---------------------------------------------------------------------
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# Disabled options
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# bluetooth support not required
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qemu_options+=(size:--disable-bluez)
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# braille support not required
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qemu_options+=(size:--disable-brlapi)
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# Don't build documentation
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qemu_options+=(minimal:--disable-docs)
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# Disable GUI (graphics)
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qemu_options+=(size:--disable-curses)
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qemu_options+=(size:--disable-gtk)
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qemu_options+=(size:--disable-opengl)
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qemu_options+=(size:--disable-sdl)
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qemu_options+=(size:--disable-spice)
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qemu_options+=(size:--disable-vte)
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# Disable graphical network access
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qemu_options+=(size:--disable-vnc)
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qemu_options+=(size:--disable-vnc-jpeg)
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qemu_options+=(size:--disable-vnc-png)
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qemu_options+=(size:--disable-vnc-sasl)
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# Disable unused filesystem support
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qemu_options+=(size:--disable-fdt)
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qemu_options+=(size:--disable-glusterfs)
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qemu_options+=(size:--disable-libiscsi)
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qemu_options+=(size:--disable-libnfs)
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qemu_options+=(size:--disable-libssh2)
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# Disable unused compression support
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qemu_options+=(size:--disable-bzip2)
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qemu_options+=(size:--disable-lzo)
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qemu_options+=(size:--disable-snappy)
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# Disable unused security options
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qemu_options+=(security:--disable-seccomp)
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qemu_options+=(security:--disable-tpm)
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# Disable userspace network access ("-net user")
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qemu_options+=(size:--disable-slirp)
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# Disable USB
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qemu_options+=(size:--disable-libusb)
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qemu_options+=(size:--disable-usb-redir)
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# Disable TCG support
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qemu_options+=(size:--disable-tcg)
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# Don't build a static binary (lowers security)
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qemu_options+=(security:--disable-static)
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# Not required as "-uuid ..." is always passed to the qemu binary
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qemu_options+=(size:--disable-uuid)
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# Disable debug
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qemu_options+=(size:--disable-debug-tcg)
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qemu_options+=(size:--disable-qom-cast-debug)
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qemu_options+=(size:--disable-tcg-interpreter)
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qemu_options+=(size:--disable-tcmalloc)
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# Disallow network downloads
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qemu_options+=(security:--disable-curl)
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# Disable Remote Direct Memory Access (Live Migration)
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# https://wiki.qemu.org/index.php/Features/RDMALiveMigration
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qemu_options+=(size:--disable-rdma)
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# Don't build the qemu-io, qemu-nbd and qemu-image tools
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qemu_options+=(size:--disable-tools)
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# Disable XEN driver
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qemu_options+=(size:--disable-xen)
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# FIXME: why is this disabled?
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# (for reference, it's explicitly enabled in Ubuntu 17.10 and
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# implicitly enabled in Fedora 27).
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qemu_options+=(size:--disable-linux-aio)
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#---------------------------------------------------------------------
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# Enabled options
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# Enable kernel Virtual Machine support.
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# This is the default, but be explicit to avoid any future surprises
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qemu_options+=(speed:--enable-kvm)
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# Required for fast network access
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qemu_options+=(speed:--enable-vhost-net)
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# Always strip binaries
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qemu_options+=(size:--enable-strip)
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# Support Ceph RADOS Block Device (RBD)
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qemu_options+=(functionality:--enable-rbd)
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# In "passthrough" security mode
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# (-fsdev "...,security_model=passthrough,..."), qemu uses a helper
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# application called virtfs-proxy-helper(1) to make certain 9p
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# operations safer.
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qemu_options+=(functionality:--enable-virtfs)
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qemu_options+=(functionality:--enable-attr)
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qemu_options+=(functionality:--enable-cap-ng)
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#---------------------------------------------------------------------
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# Other options
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# 64-bit only
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[ "$arch" = x86_64 ] && qemu_options+=(arch:"--target-list=${arch}-softmmu")
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_qemu_cflags=""
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# compile with high level of optimisation
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_qemu_cflags+=" -O3"
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# Improve code quality by assuming identical semantics for interposed
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# synmbols.
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_qemu_cflags+=" -fno-semantic-interposition"
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# Performance optimisation
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_qemu_cflags+=" -falign-functions=32"
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# SECURITY: make the compiler check for common security issues
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# (such as argument and buffer overflows checks).
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_qemu_cflags+=" -D_FORTIFY_SOURCE=2"
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# SECURITY: Create binary as a Position Independant Executable,
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# and take advantage of ASLR, making ROP attacks much harder to perform.
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# (https://wiki.debian.org/Hardening)
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_qemu_cflags+=" -fPIE"
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# Set compile options
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qemu_options+=(functionality,security,speed,size:"--extra-cflags=\"${_qemu_cflags}\"")
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unset _qemu_cflags
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_qemu_ldflags=""
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# SECURITY: Link binary as a Position Independant Executable,
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# and take advantage of ASLR, making ROP attacks much harder to perform.
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# (https://wiki.debian.org/Hardening)
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_qemu_ldflags+=" -pie"
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# SECURITY: Disallow executing code on the stack.
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_qemu_ldflags+=" -z noexecstack"
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# SECURITY: Make the linker set some program sections to read-only
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# before the program is run to stop certain attacks.
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_qemu_ldflags+=" -z relro"
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# SECURITY: Make the linker resolve all symbols immediately on program
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# load.
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_qemu_ldflags+=" -z now"
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qemu_options+=(security:"--extra-ldflags=\"${_qemu_ldflags}\"")
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unset _qemu_ldflags
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# Where to install qemu libraries
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[ "$arch" = x86_64 ] && qemu_options+=(arch:--libdir=/usr/lib64/${hypervisor})
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# Where to install qemu helper binaries
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qemu_options+=(misc:--libexecdir=/usr/libexec/${hypervisor})
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# Where to install data files
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qemu_options+=(misc:--datadir=/usr/share/${hypervisor})
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show_array qemu_options "$action"
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exit 0
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}
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main $@
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