/etc/libvirt/qemu.conf is in libvirt-bin 0.9.12.3-1+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# All settings described here are optional - if omitted, sensible
# defaults are used.
# VNC is configured to listen on 127.0.0.1 by default.
# To make it listen on all public interfaces, uncomment
# this next option.
#
# NB, strong recommendation to enable TLS + x509 certificate
# verification when allowing public access
#
# vnc_listen = "0.0.0.0"
# Enable this option to have VNC served over an automatically created
# unix socket. This prevents unprivileged access from users on the
# host machine, though most VNC clients do not support it.
#
# This will only be enabled for VNC configurations that do not have
# a hardcoded 'listen' or 'socket' value. This setting takes preference
# over vnc_listen.
#
# vnc_auto_unix_socket = 1
# Enable use of TLS encryption on the VNC server. This requires
# a VNC client which supports the VeNCrypt protocol extension.
# Examples include vinagre, virt-viewer, virt-manager and vencrypt
# itself. UltraVNC, RealVNC, TightVNC do not support this
#
# It is necessary to setup CA and issue a server certificate
# before enabling this.
#
# vnc_tls = 1
# Use of TLS requires that x509 certificates be issued. The
# default it to keep them in /etc/pki/libvirt-vnc. This directory
# must contain
#
# ca-cert.pem - the CA master certificate
# server-cert.pem - the server certificate signed with ca-cert.pem
# server-key.pem - the server private key
#
# This option allows the certificate directory to be changed
#
# vnc_tls_x509_cert_dir = "/etc/pki/libvirt-vnc"
# The default TLS configuration only uses certificates for the server
# allowing the client to verify the server's identity and establish
# an encrypted channel.
#
# It is possible to use x509 certificates for authentication too, by
# issuing a x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client who does not have a
# certificate signed by the CA in /etc/pki/libvirt-vnc/ca-cert.pem
#
# vnc_tls_x509_verify = 1
# The default VNC password. Only 8 letters are significant for
# VNC passwords. This parameter is only used if the per-domain
# XML config does not already provide a password. To allow
# access without passwords, leave this commented out. An empty
# string will still enable passwords, but be rejected by QEMU,
# effectively preventing any use of VNC. Obviously change this
# example here before you set this.
#
# vnc_password = "XYZ12345"
# Enable use of SASL encryption on the VNC server. This requires
# a VNC client which supports the SASL protocol extension.
# Examples include vinagre, virt-viewer and virt-manager
# itself. UltraVNC, RealVNC, TightVNC do not support this
#
# It is necessary to configure /etc/sasl2/qemu.conf to choose
# the desired SASL plugin (eg, GSSPI for Kerberos)
#
# vnc_sasl = 1
# The default SASL configuration file is located in /etc/sasl2/
# When running libvirtd unprivileged, it may be desirable to
# override the configs in this location. Set this parameter to
# point to the directory, and create a qemu.conf in that location
#
# vnc_sasl_dir = "/some/directory/sasl2"
# SPICE is configured to listen on 127.0.0.1 by default.
# To make it listen on all public interfaces, uncomment
# this next option.
#
# NB, strong recommendation to enable TLS + x509 certificate
# verification when allowing public access
#
# spice_listen = "0.0.0.0"
# Enable use of TLS encryption on the SPICE server.
#
# It is necessary to setup CA and issue a server certificate
# before enabling this.
#
# spice_tls = 1
# Use of TLS requires that x509 certificates be issued. The
# default it to keep them in /etc/pki/libvirt-spice. This directory
# must contain
#
# ca-cert.pem - the CA master certificate
# server-cert.pem - the server certificate signed with ca-cert.pem
# server-key.pem - the server private key
#
# This option allows the certificate directory to be changed.
#
# spice_tls_x509_cert_dir = "/etc/pki/libvirt-spice"
# The default SPICE password. This parameter is only used if the
# per-domain XML config does not already provide a password. To
# allow access without passwords, leave this commented out. An
# empty string will still enable passwords, but be rejected by
# QEMU, effectively preventing any use of SPICE. Obviously change
# this example here before you set this.
#
# spice_password = "XYZ12345"
# The default security driver is SELinux. If SELinux is disabled
# on the host, then the security driver will automatically disable
# itself. If you wish to disable QEMU SELinux security driver while
# leaving SELinux enabled for the host in general, then set this
# to 'none' instead.
#
# security_driver = "selinux"
# If set to non-zero, then the default security labeling
# will make guests confined. If set to zero, then guests
# will be unconfined by default. Defaults to 1.
# security_default_confined = 1
# If set to non-zero, then attempts to create unconfined
# guests will be blocked. Defaults to 0.
# security_require_confined = 1
# The user ID for QEMU processes run by the system instance.
#user = "root"
# The group ID for QEMU processes run by the system instance.
#group = "root"
# Whether libvirt should dynamically change file ownership
# to match the configured user/group above. Defaults to 1.
# Set to 0 to disable file ownership changes.
#dynamic_ownership = 1
# What cgroup controllers to make use of with QEMU guests
#
# - 'cpu' - use for schedular tunables
# - 'devices' - use for device whitelisting
# - 'memory' - use for memory tunables
# - 'blkio' - use for block devices I/O tunables
# - 'cpuset' - use for CPUs and memory nodes
# - 'cpuacct' - use for CPUs statistics.
#
# NB, even if configured here, they won't be used unless
# the administrator has mounted cgroups, e.g.:
#
# mkdir /dev/cgroup
# mount -t cgroup -o devices,cpu,memory,blkio,cpuset none /dev/cgroup
#
# They can be mounted anywhere, and different controllers
# can be mounted in different locations. libvirt will detect
# where they are located.
#
# cgroup_controllers = [ "cpu", "devices", "memory", "blkio", "cpuset", "cpuacct" ]
# This is the basic set of devices allowed / required by
# all virtual machines.
#
# As well as this, any configured block backed disks,
# all sound device, and all PTY devices are allowed.
#
# This will only need setting if newer QEMU suddenly
# wants some device we don't already know about.
#
#cgroup_device_acl = [
# "/dev/null", "/dev/full", "/dev/zero",
# "/dev/random", "/dev/urandom",
# "/dev/ptmx", "/dev/kvm", "/dev/kqemu",
# "/dev/rtc", "/dev/hpet",
#]
# The default format for Qemu/KVM guest save images is raw; that is, the
# memory from the domain is dumped out directly to a file. If you have
# guests with a large amount of memory, however, this can take up quite
# a bit of space. If you would like to compress the images while they
# are being saved to disk, you can also set "lzop", "gzip", "bzip2", or "xz"
# for save_image_format. Note that this means you slow down the process of
# saving a domain in order to save disk space; the list above is in descending
# order by performance and ascending order by compression ratio.
#
# save_image_format is used when you use 'virsh save' at scheduled
# saving, and it is an error if the specified save_image_format is
# not valid, or the requested compression program can't be found.
#
# dump_image_format is used when you use 'virsh dump' at emergency
# crashdump, and if the specified dump_image_format is not valid, or
# the requested compression program can't be found, this falls
# back to "raw" compression.
#
# save_image_format = "raw"
# dump_image_format = "raw"
# When a domain is configured to be auto-dumped when libvirtd receives a
# watchdog event from qemu guest, libvirtd will save dump files in directory
# specified by auto_dump_path. Default value is /var/lib/libvirt/qemu/dump
#
# auto_dump_path = "/var/lib/libvirt/qemu/dump"
# When a domain is configured to be auto-dumped, enabling this flag
# has the same effect as using the VIR_DUMP_BYPASS_CACHE flag with the
# virDomainCoreDump API. That is, the system will avoid using the
# file system cache while writing the dump file, but may cause
# slower operation.
#
# auto_dump_bypass_cache = 0
# When a domain is configured to be auto-started, enabling this flag
# has the same effect as using the VIR_DOMAIN_START_BYPASS_CACHE flag
# with the virDomainCreateWithFlags API. That is, the system will
# avoid using the file system cache when restoring any managed state
# file, but may cause slower operation.
#
# auto_start_bypass_cache = 0
# If provided by the host and a hugetlbfs mount point is configured,
# a guest may request huge page backing. When this mount point is
# unspecified here, determination of a host mount point in /proc/mounts
# will be attempted. Specifying an explicit mount overrides detection
# of the same in /proc/mounts. Setting the mount point to "" will
# disable guest hugepage backing.
#
# NB, within this mount point, guests will create memory backing files
# in a location of $MOUNTPOINT/libvirt/qemu
#
# hugetlbfs_mount = "/dev/hugepages"
# mac_filter enables MAC addressed based filtering on bridge ports.
# This currently requires ebtables to be installed.
#
# mac_filter = 1
# By default, PCI devices below non-ACS switch are not allowed to be assigned
# to guests. By setting relaxed_acs_check to 1 such devices will be allowed to
# be assigned to guests.
#
# relaxed_acs_check = 1
# QEMU implements an extension for providing audio over a VNC connection,
# though if your VNC client does not support it, your only chance for getting
# sound output is through regular audio backends. By default, libvirt will
# disable all QEMU sound backends if using VNC, since they can cause
# permissions issues. Enabling this option will make libvirtd honor the
# QEMU_AUDIO_DRV environment variable when using VNC.
#
# vnc_allow_host_audio = 0
# If clear_emulator_capabilities is enabled, libvirt will drop all
# privileged capabilities of the QEmu/KVM emulator. This is enabled by
# default.
#
# Warning: Disabling this option means that a compromised guest can
# exploit the privileges and possibly do damage to the host.
#
# clear_emulator_capabilities = 1
# If allow_disk_format_probing is enabled, libvirt will probe disk
# images to attempt to identify their format, when not otherwise
# specified in the XML. This is disabled by default.
#
# WARNING: Enabling probing is a security hole in almost all
# deployments. It is strongly recommended that users update their
# guest XML <disk> elements to include <driver type='XXXX'/>
# elements instead of enabling this option.
#
# allow_disk_format_probing = 1
# If enabled, libvirt will have QEMU set its process name to
# "qemu:VM_NAME", where VM_NAME is the name of the VM. The QEMU
# process will appear as "qemu:VM_NAME" in process listings and
# other system monitoring tools. By default, QEMU does not set
# its process title, so the complete QEMU command (emulator and
# its arguments) appear in process listings.
#
# set_process_name = 1
# If max_processes is set to a positive integer, libvirt will use
# it to set the maximum number of processes that can be run by qemu
# user. This can be used to override default value set by host OS.
# The same applies to max_files which sets the limit on the maximum
# number of opened files.
#
# max_processes = 0
# max_files = 0
# To enable 'Sanlock' project based locking of the file
# content (to prevent two VMs writing to the same
# disk), uncomment this
#
# lock_manager = "sanlock"
# Set limit of maximum APIs queued on one domain. All other APIs
# over this threshold will fail on acquiring job lock. Specially,
# setting to zero turns this feature off.
# Note, that job lock is per domain.
#
# max_queued = 0
###################################################################
# Keepalive protocol:
# This allows qemu driver to detect broken connections to remote
# libvirtd during peer-to-peer migration. A keepalive message is
# sent to the deamon after keepalive_interval seconds of inactivity
# to check if the deamon is still responding; keepalive_count is a
# maximum number of keepalive messages that are allowed to be sent
# to the deamon without getting any response before the connection
# is considered broken. In other words, the connection is
# automatically closed approximately after
# keepalive_interval * (keepalive_count + 1) seconds since the last
# message received from the deamon. If keepalive_interval is set to
# -1, qemu driver will not send keepalive requests during
# peer-to-peer migration; however, the remote libvirtd can still
# send them and source libvirtd will send responses. When
# keepalive_count is set to 0, connections will be automatically
# closed after keepalive_interval seconds of inactivity without
# sending any keepalive messages.
#
#keepalive_interval = 5
#keepalive_count = 5
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