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#1 2020-03-23 10:53:36

Schlunze
Member
Registered: 2013-10-03
Posts: 53

libvirt: cannot limit locked memory

Hello guys,

i currently try to pass trough my graphic card. I work with an old installation that has worked in the past.
After updating and writing the .pacnew configs it looks like ive made a mistake, so your advice is very much appreciated

When a new Win10 VM is started with the graphic card the following error occurs (virsh start Windows10):

Fehler: Domain Windows10 konnte nicht gestartet werden
Fehler: internal error: Process exited prior to exec: libvirt:  error : cannot limit locked memory to 18253611008: Operation not permitted

Kernel options:

options	root=UUID=560216e1-c83f-4245-a621-1bc8bb0c18b3 rw intel_iommu=on iommu=pt

IOMMU Group:

IOMMU Group 1:
	00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller [8086:0c01] (rev 06)
	01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM206 [GeForce GTX 960] [10de:1401] (rev a1)
	01:00.1 Audio device [0403]: NVIDIA Corporation GM206 High Definition Audio Controller [10de:0fba] (rev a1)

/etc/modprobe.d/vfio.conf

blacklist nouveau
options vfio-pci ids=10de:1401,10de:0fba

dmesg | grep -i vfio

[    1.117860] VFIO - User Level meta-driver version: 0.3
[    1.121133] vfio-pci 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=none
[    1.135375] vfio_pci: add [10de:1401[ffffffff:ffffffff]] class 0x000000/00000000
[    1.152086] vfio_pci: add [10de:0fba[ffffffff:ffffffff]] class 0x000000/00000000
[    5.569797] vfio-pci 0000:01:00.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=none

dmesg | grep -i -e DMAR -e IOMMU

[    0.142646] DMAR: IOMMU enabled
[    0.225306] DMAR: Host address width 39
[    0.225307] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[    0.225310] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap c0000020660462 ecap f0101a
[    0.225311] DMAR: DRHD base: 0x000000fed91000 flags: 0x1
[    0.225312] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap d2008c20660462 ecap f010da
[    0.225313] DMAR: RMRR base: 0x000000ade9e000 end: 0x000000adeacfff
[    0.225314] DMAR: RMRR base: 0x000000af000000 end: 0x000000bf1fffff
[    0.225315] DMAR-IR: IOAPIC id 8 under DRHD base  0xfed91000 IOMMU 1
[    0.225316] DMAR-IR: HPET id 0 under DRHD base 0xfed91000
[    0.225316] DMAR-IR: x2apic is disabled because BIOS sets x2apic opt out bit.
[    0.225316] DMAR-IR: Use 'intremap=no_x2apic_optout' to override the BIOS setting.
[    0.225650] DMAR-IR: Enabled IRQ remapping in xapic mode
[    0.635836] iommu: Default domain type: Passthrough (set via kernel command line)
[    0.863763] DMAR: No ATSR found
[    0.863799] DMAR: dmar0: Using Queued invalidation
[    0.863803] DMAR: dmar1: Using Queued invalidation
[    0.985844] pci 0000:00:00.0: Adding to iommu group 0
[    0.985858] pci 0000:00:01.0: Adding to iommu group 1
[    0.985868] pci 0000:00:02.0: Adding to iommu group 2
[    0.985875] pci 0000:00:03.0: Adding to iommu group 3
[    0.985883] pci 0000:00:14.0: Adding to iommu group 4
[    0.985893] pci 0000:00:16.0: Adding to iommu group 5
[    0.985900] pci 0000:00:19.0: Adding to iommu group 6
[    0.985907] pci 0000:00:1a.0: Adding to iommu group 7
[    0.985914] pci 0000:00:1b.0: Adding to iommu group 8
[    0.985923] pci 0000:00:1c.0: Adding to iommu group 9
[    0.985931] pci 0000:00:1c.2: Adding to iommu group 10
[    0.985938] pci 0000:00:1c.3: Adding to iommu group 11
[    0.985946] pci 0000:00:1c.6: Adding to iommu group 12
[    0.985953] pci 0000:00:1d.0: Adding to iommu group 13
[    0.985969] pci 0000:00:1f.0: Adding to iommu group 14
[    0.985976] pci 0000:00:1f.2: Adding to iommu group 14
[    0.985984] pci 0000:00:1f.3: Adding to iommu group 14
[    0.985991] pci 0000:01:00.0: Adding to iommu group 1
[    0.985994] pci 0000:01:00.1: Adding to iommu group 1
[    0.986005] pci 0000:03:00.0: Adding to iommu group 15
[    0.986015] pci 0000:04:00.0: Adding to iommu group 16
[    0.986025] pci 0000:05:01.0: Adding to iommu group 17
[    0.986032] pci 0000:05:03.0: Adding to iommu group 18
[    0.986040] pci 0000:05:05.0: Adding to iommu group 19
[    0.986047] pci 0000:05:07.0: Adding to iommu group 20
[    0.986055] pci 0000:07:00.0: Adding to iommu group 18
[    0.986063] pci 0000:09:00.0: Adding to iommu group 20
[    0.986073] pci 0000:0a:00.0: Adding to iommu group 21
[    0.986113] DMAR: Intel(R) Virtualization Technology for Directed I/O
[    1.017794] AMD-Vi: AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>
[    1.017794] AMD-Vi: AMD IOMMUv2 functionality not available on this system
[    1.211430] ehci-pci 0000:00:1a.0: Using iommu dma mapping
[    1.211430] ehci-pci 0000:00:1a.0: DMAR: 32bit DMA uses non-identity mapping
[    1.232418] ehci-pci 0000:00:1d.0: Using iommu dma mapping
[    1.232419] ehci-pci 0000:00:1d.0: DMAR: 32bit DMA uses non-identity mapping
[    5.568989] i915 0000:00:02.0: DMAR active, disabling use of stolen memory

Here my config In detail:
/etc/libvirt/libvirtd.conf

# Master libvirt daemon configuration file
#

#################################################################
#
# Network connectivity controls
#

# Flag listening for secure TLS connections on the public TCP/IP port.
# NB, must pass the --listen flag to the libvirtd process for this to
# have any effect.
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# It is necessary to setup a CA and issue server certificates before
# using this capability.
#
# This is enabled by default, uncomment this to disable it
#listen_tls = 0

# Listen for unencrypted TCP connections on the public TCP/IP port.
# NB, must pass the --listen flag to the libvirtd process for this to
# have any effect.
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# Using the TCP socket requires SASL authentication by default. Only
# SASL mechanisms which support data encryption are allowed. This is
# DIGEST_MD5 and GSSAPI (Kerberos5)
#
# This is disabled by default, uncomment this to enable it.
#listen_tcp = 1



# Override the port for accepting secure TLS connections
# This can be a port number, or service name
#
# This setting is not required or honoured if using systemd socket
# activation with systemd version >= 227
#
#tls_port = "16514"

# Override the port for accepting insecure TCP connections
# This can be a port number, or service name
#
# This setting is not required or honoured if using systemd socket
# activation with systemd version >= 227
#
#tcp_port = "16509"


# Override the default configuration which binds to all network
# interfaces. This can be a numeric IPv4/6 address, or hostname
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# If the libvirtd service is started in parallel with network
# startup (e.g. with systemd), binding to addresses other than
# the wildcards (0.0.0.0/::) might not be available yet.
#
#listen_addr = "192.168.0.1"


#################################################################
#
# UNIX socket access controls
#

# Set the UNIX domain socket group ownership. This can be used to
# allow a 'trusted' set of users access to management capabilities
# without becoming root.
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# This is restricted to 'root' by default.
unix_sock_group = "libvirt"

# Set the UNIX socket permissions for the R/O socket. This is used
# for monitoring VM status only
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# Default allows any user. If setting group ownership, you may want to
# restrict this too.
unix_sock_ro_perms = "0777"

# Set the UNIX socket permissions for the R/W socket. This is used
# for full management of VMs
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# Default allows only root. If PolicyKit is enabled on the socket,
# the default will change to allow everyone (eg, 0777)
#
# If not using PolicyKit and setting group ownership for access
# control, then you may want to relax this too.
unix_sock_rw_perms = "0770"

# Set the UNIX socket permissions for the admin interface socket.
#
# This setting is not required or honoured if using systemd socket
# activation.
#
# Default allows only owner (root), do not change it unless you are
# sure to whom you are exposing the access to.
unix_sock_admin_perms = "0700"

# Set the name of the directory in which sockets will be found/created.
#
# This setting is not required or honoured if using systemd socket
# activation with systemd version >= 227
#
#unix_sock_dir = "/var/run/libvirt"



#################################################################
#
# Authentication.
#
#  - none: do not perform auth checks. If you can connect to the
#          socket you are allowed. This is suitable if there are
#          restrictions on connecting to the socket (eg, UNIX
#          socket permissions), or if there is a lower layer in
#          the network providing auth (eg, TLS/x509 certificates)
#
#  - sasl: use SASL infrastructure. The actual auth scheme is then
#          controlled from /etc/sasl2/libvirt.conf. For the TCP
#          socket only GSSAPI & DIGEST-MD5 mechanisms will be used.
#          For non-TCP or TLS sockets, any scheme is allowed.
#
#  - polkit: use PolicyKit to authenticate. This is only suitable
#            for use on the UNIX sockets. The default policy will
#            require a user to supply their own password to gain
#            full read/write access (aka sudo like), while anyone
#            is allowed read/only access.
#
# Set an authentication scheme for UNIX read-only sockets
# By default socket permissions allow anyone to connect
#
# To restrict monitoring of domains you may wish to enable
# an authentication mechanism here
auth_unix_ro = "none"

# Set an authentication scheme for UNIX read-write sockets
# By default socket permissions only allow root. If PolicyKit
# support was compiled into libvirt, the default will be to
# use 'polkit' auth.
#
# If the unix_sock_rw_perms are changed you may wish to enable
# an authentication mechanism here
auth_unix_rw = "none"

# Change the authentication scheme for TCP sockets.
#
# If you don't enable SASL, then all TCP traffic is cleartext.
# Don't do this outside of a dev/test scenario. For real world
# use, always enable SASL and use the GSSAPI or DIGEST-MD5
# mechanism in /etc/sasl2/libvirt.conf
#auth_tcp = "sasl"

# Change the authentication scheme for TLS sockets.
#
# TLS sockets already have encryption provided by the TLS
# layer, and limited authentication is done by certificates
#
# It is possible to make use of any SASL authentication
# mechanism as well, by using 'sasl' for this option
#auth_tls = "none"


# Change the API access control scheme
#
# By default an authenticated user is allowed access
# to all APIs. Access drivers can place restrictions
# on this. By default the 'nop' driver is enabled,
# meaning no access control checks are done once a
# client has authenticated with libvirtd
#
#access_drivers = [ "polkit" ]

#################################################################
#
# TLS x509 certificate configuration
#

# Use of TLS requires that x509 certificates be issued. The default locations
# for the certificate files is as follows:
#
#   /etc/pki/CA/cacert.pem - The CA master certificate
#   /etc/pki/libvirt/servercert.pem - The server certificate signed by cacert.pem
#   /etc/pki/libvirt/private/serverkey.pem - The server private key
#
# It is possible to override the default locations by altering the 'key_file',
# 'cert_file', and 'ca_file' values and uncommenting them below.
#
# NB, overriding the default of one location requires uncommenting and
# possibly additionally overriding the other settings.
#

# Override the default server key file path
#
#key_file = "/etc/pki/libvirt/private/serverkey.pem"

# Override the default server certificate file path
#
#cert_file = "/etc/pki/libvirt/servercert.pem"

# Override the default CA certificate path
#
#ca_file = "/etc/pki/CA/cacert.pem"

# Specify a certificate revocation list.
#
# Defaults to not using a CRL, uncomment to enable it
#crl_file = "/etc/pki/CA/crl.pem"



#################################################################
#
# Authorization controls
#


# Flag to disable verification of our own server certificates
#
# When libvirtd starts it performs some sanity checks against
# its own certificates.
#
# Default is to always run sanity checks. Uncommenting this
# will disable sanity checks which is not a good idea
#tls_no_sanity_certificate = 1

# Flag to disable verification of client certificates
#
# Client certificate verification is the primary authentication mechanism.
# Any client which does not present a certificate signed by the CA
# will be rejected.
#
# Default is to always verify. Uncommenting this will disable
# verification - make sure an IP whitelist is set
#tls_no_verify_certificate = 1


# A whitelist of allowed x509 Distinguished Names
# This list may contain wildcards such as
#
#    "C=GB,ST=London,L=London,O=Red Hat,CN=*"
#
# See the POSIX fnmatch function for the format of the wildcards.
#
# NB If this is an empty list, no client can connect, so comment out
# entirely rather than using empty list to disable these checks
#
# By default, no DN's are checked
#tls_allowed_dn_list = ["DN1", "DN2"]


# Override the compile time default TLS priority string. The
# default is usually "NORMAL" unless overridden at build time.
# Only set this is it is desired for libvirt to deviate from
# the global default settings.
#
#tls_priority="NORMAL"


# A whitelist of allowed SASL usernames. The format for username
# depends on the SASL authentication mechanism. Kerberos usernames
# look like username@REALM
#
# This list may contain wildcards such as
#
#    "*@EXAMPLE.COM"
#
# See the POSIX fnmatch function for the format of the wildcards.
#
# NB If this is an empty list, no client can connect, so comment out
# entirely rather than using empty list to disable these checks
#
# By default, no Username's are checked
#sasl_allowed_username_list = ["joe@EXAMPLE.COM", "fred@EXAMPLE.COM" ]


#################################################################
#
# Processing controls
#

# The maximum number of concurrent client connections to allow
# over all sockets combined.
#max_clients = 5000

# The maximum length of queue of connections waiting to be
# accepted by the daemon. Note, that some protocols supporting
# retransmission may obey this so that a later reattempt at
# connection succeeds.
#max_queued_clients = 1000

# The maximum length of queue of accepted but not yet
# authenticated clients. The default value is 20. Set this to
# zero to turn this feature off.
#max_anonymous_clients = 20

# The minimum limit sets the number of workers to start up
# initially. If the number of active clients exceeds this,
# then more threads are spawned, up to max_workers limit.
# Typically you'd want max_workers to equal maximum number
# of clients allowed
#min_workers = 5
#max_workers = 20


# The number of priority workers. If all workers from above
# pool are stuck, some calls marked as high priority
# (notably domainDestroy) can be executed in this pool.
#prio_workers = 5

# Limit on concurrent requests from a single client
# connection. To avoid one client monopolizing the server
# this should be a small fraction of the global max_workers
# parameter.
#max_client_requests = 5

# Same processing controls, but this time for the admin interface.
# For description of each option, be so kind to scroll few lines
# upwards.

#admin_min_workers = 1
#admin_max_workers = 5
#admin_max_clients = 5
#admin_max_queued_clients = 5
#admin_max_client_requests = 5

#################################################################
#
# Logging controls
#

# Logging level: 4 errors, 3 warnings, 2 information, 1 debug
# basically 1 will log everything possible
#
# WARNING: USE OF THIS IS STRONGLY DISCOURAGED.
#
# WARNING: It outputs too much information to practically read.
# WARNING: The "log_filters" setting is recommended instead.
#
# WARNING: Journald applies rate limiting of messages and so libvirt
# WARNING: will limit "log_level" to only allow values 3 or 4 if
# WARNING: journald is the current output.
#
# WARNING: USE OF THIS IS STRONGLY DISCOURAGED.
#log_level = 3

# Logging filters:
# A filter allows to select a different logging level for a given category
# of logs. The format for a filter is:
#
#    level:match
#
# where 'match' is a string which is matched against the category
# given in the VIR_LOG_INIT() at the top of each libvirt source
# file, e.g., "remote", "qemu", or "util.json". The 'match' in the
# filter matches using shell wildcard syntax (see 'man glob(7)').
# The 'match' is always treated as a substring match. IOW a match
# string 'foo' is equivalent to '*foo*'.
#
# 'level' is the minimal level where matching messages should
#  be logged:
#
#    1: DEBUG
#    2: INFO
#    3: WARNING
#    4: ERROR
#
# Multiple filters can be defined in a single @log_filters, they just need
# to be separated by spaces. Note that libvirt performs "first" match, i.e.
# if there are concurrent filters, the first one that matches will be applied,
# given the order in @log_filters.
#
# A typical need is to capture information from a hypervisor driver,
# public API entrypoints and some of the utility code. Some utility
# code is very verbose and is generally not desired. Taking the QEMU
# hypervisor as an example, a suitable filter string for debugging
# might be to turn off object, json & event logging, but enable the
# rest of the util code:
#
#log_filters="1:qemu 1:libvirt 4:object 4:json 4:event 1:util"

# Logging outputs:
# An output is one of the places to save logging information
# The format for an output can be:
#    level:stderr
#      output goes to stderr
#    level:syslog:name
#      use syslog for the output and use the given name as the ident
#    level:file:file_path
#      output to a file, with the given filepath
#    level:journald
#      output to journald logging system
# In all cases 'level' is the minimal priority, acting as a filter
#    1: DEBUG
#    2: INFO
#    3: WARNING
#    4: ERROR
#
# Multiple outputs can be defined, they just need to be separated by spaces.
# e.g. to log all warnings and errors to syslog under the libvirtd ident:
#log_outputs="3:syslog:libvirtd"


##################################################################
#
# Auditing
#
# This setting allows usage of the auditing subsystem to be altered:
#
#   audit_level == 0  -> disable all auditing
#   audit_level == 1  -> enable auditing, only if enabled on host (default)
#   audit_level == 2  -> enable auditing, and exit if disabled on host
#
#audit_level = 2
#
# If set to 1, then audit messages will also be sent
# via libvirt logging infrastructure. Defaults to 0
#
#audit_logging = 1

###################################################################
# UUID of the host:
# Host UUID is read from one of the sources specified in host_uuid_source.
#
# - 'smbios': fetch the UUID from 'dmidecode -s system-uuid'
# - 'machine-id': fetch the UUID from /etc/machine-id
#
# The host_uuid_source default is 'smbios'. If 'dmidecode' does not provide
# a valid UUID a temporary UUID will be generated.
#
# Another option is to specify host UUID in host_uuid.
#
# Keep the format of the example UUID below. UUID must not have all digits
# be the same.

# NB This default all-zeros UUID will not work. Replace
# it with the output of the 'uuidgen' command and then
# uncomment this entry
#host_uuid = "00000000-0000-0000-0000-000000000000"
#host_uuid_source = "smbios"

###################################################################
# Keepalive protocol:
# This allows libvirtd to detect broken client connections or even
# dead clients.  A keepalive message is sent to a client after
# keepalive_interval seconds of inactivity to check if the client is
# still responding; keepalive_count is a maximum number of keepalive
# messages that are allowed to be sent to the client 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 client.  If keepalive_interval is set to
# -1, libvirtd will never send keepalive requests; however clients
# can still send them and the daemon 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

#
# These configuration options are no longer used.  There is no way to
# restrict such clients from connecting since they first need to
# connect in order to ask for keepalive.
#
#keepalive_required = 1
#admin_keepalive_required = 1

# Keepalive settings for the admin interface
#admin_keepalive_interval = 5
#admin_keepalive_count = 5

###################################################################
# Open vSwitch:
# This allows to specify a timeout for openvswitch calls made by
# libvirt. The ovs-vsctl utility is used for the configuration and
# its timeout option is set by default to 5 seconds to avoid
# potential infinite waits blocking libvirt.
#
#ovs_timeout = 5

/etc/libvirt/qemu.conf

# Master configuration file for the QEMU driver.
# All settings described here are optional - if omitted, sensible
# defaults are used.

# Use of TLS requires that x509 certificates be issued. The default is
# to keep them in /etc/pki/qemu. 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
#
# and optionally may contain
#
#  dh-params.pem - the DH params configuration file
#
# If the directory does not exist, libvirtd will fail to start. If the
# directory doesn't contain the necessary files, QEMU domains will fail
# to start if they are configured to use TLS.
#
# In order to overwrite the default path alter the following. This path
# definition will be used as the default path for other *_tls_x509_cert_dir
# configuration settings if their default path does not exist or is not
# specifically set.
#
#default_tls_x509_cert_dir = "/etc/pki/qemu"


# 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 an 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/qemu/ca-cert.pem
#
# The default_tls_x509_cert_dir directory must also contain
#
#  client-cert.pem - the client certificate signed with the ca-cert.pem
#  client-key.pem - the client private key
#
#default_tls_x509_verify = 1

#
# Libvirt assumes the server-key.pem file is unencrypted by default.
# To use an encrypted server-key.pem file, the password to decrypt
# the PEM file is required. This can be provided by creating a secret
# object in libvirt and then to uncomment this setting to set the UUID
# of the secret.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#default_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"


# 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 have listen
# type=address but without any address specified. 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


# In order to override the default TLS certificate location for
# vnc certificates, supply a valid path to the certificate directory.
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but vnc_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
#vnc_tls_x509_cert_dir = "/etc/pki/libvirt-vnc"


# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
#vnc_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"


# 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 an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# ca-cert.pem certificate signed by the CA in the vnc_tls_x509_cert_dir
# (or default_tls_x509_cert_dir) as well as the corresponding client-*.pem
# files described in default_tls_x509_cert_dir.
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify".
#
#vnc_tls_x509_verify = 1


# The default VNC password. Only 8 bytes 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"


# 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



# 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


# In order to override the default TLS certificate location for
# spice certificates, supply a valid path to the certificate directory.
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but spice_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
#spice_tls_x509_cert_dir = "/etc/pki/libvirt-spice"


# Enable this option to have SPICE served over an automatically created
# unix socket. This prevents unprivileged access from users on the
# host machine.
#
# This will only be enabled for SPICE configurations that have listen
# type=address but without any address specified. This setting takes
# preference over spice_listen.
#
#spice_auto_unix_socket = 1


# 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"

# Enable use of SASL encryption on the SPICE server. This requires
# a SPICE client which supports the SASL protocol extension.
#
# It is necessary to configure /etc/sasl2/qemu.conf to choose
# the desired SASL plugin (eg, GSSPI for Kerberos)
#
#spice_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
#
#spice_sasl_dir = "/some/directory/sasl2"

# Enable use of TLS encryption on the chardev TCP transports.
#
# It is necessary to setup CA and issue a server certificate
# before enabling this.
#
#chardev_tls = 1


# In order to override the default TLS certificate location for character
# device TCP certificates, supply a valid path to the certificate directory.
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but chardev_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
#chardev_tls_x509_cert_dir = "/etc/pki/libvirt-chardev"


# 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 an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# ca-cert.pem certificate signed by the CA in the chardev_tls_x509_cert_dir
# (or default_tls_x509_cert_dir) as well as the corresponding client-*.pem
# files described in default_tls_x509_cert_dir.
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify".
#
#chardev_tls_x509_verify = 1


# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#chardev_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"


# Enable use of TLS encryption for all VxHS network block devices that
# don't specifically disable.
#
# When the VxHS network block device server is set up appropriately,
# x509 certificates are required for authentication between the clients
# (qemu processes) and the remote VxHS server.
#
# It is necessary to setup CA and issue the client certificate before
# enabling this.
#
#vxhs_tls = 1


# In order to override the default TLS certificate location for VxHS
# backed storage, supply a valid path to the certificate directory.
# This is used to authenticate the VxHS block device clients to the VxHS
# server.
#
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but vxhs_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
# VxHS block device clients expect the client certificate and key to be
# present in the certificate directory along with the CA master certificate.
# If using the default environment, default_tls_x509_verify must be configured.
# Since this is only a client the server-key.pem certificate is not needed.
# Thus a VxHS directory must contain the following:
#
#  ca-cert.pem - the CA master certificate
#  client-cert.pem - the client certificate signed with the ca-cert.pem
#  client-key.pem - the client private key
#
#vxhs_tls_x509_cert_dir = "/etc/pki/libvirt-vxhs"



# Enable use of TLS encryption for all NBD disk devices that don't
# specifically disable it.
#
# When the NBD server is set up appropriately, x509 certificates are required
# for authentication between the client and the remote NBD server.
#
# It is necessary to setup CA and issue the client certificate before
# enabling this.
#
#nbd_tls = 1


# In order to override the default TLS certificate location for NBD
# backed storage, supply a valid path to the certificate directory.
# This is used to authenticate the NBD block device clients to the NBD
# server.
#
# If the provided path does not exist, libvirtd will fail to start.
# If the path is not provided, but nbd_tls = 1, then the
# default_tls_x509_cert_dir path will be used.
#
# NBD block device clients expect the client certificate and key to be
# present in the certificate directory along with the CA certificate.
# Since this is only a client the server-key.pem certificate is not needed.
# Thus a NBD directory must contain the following:
#
#  ca-cert.pem - the CA master certificate
#  client-cert.pem - the client certificate signed with the ca-cert.pem
#  client-key.pem - the client private key
#
#nbd_tls_x509_cert_dir = "/etc/pki/libvirt-nbd"


# In order to override the default TLS certificate location for migration
# certificates, supply a valid path to the certificate directory. If the
# provided path does not exist, libvirtd will fail to start. If the path is
# not provided, but migrate_tls = 1, then the default_tls_x509_cert_dir path
# will be used. Once/if a default certificate is enabled/defined, migration
# will then be able to use the certificate via migration API flags.
#
#migrate_tls_x509_cert_dir = "/etc/pki/libvirt-migrate"


# 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 an x509 certificate to every client who needs to connect.
#
# Enabling this option will reject any client that does not have a
# ca-cert.pem certificate signed by the CA in the migrate_tls_x509_cert_dir
# (or default_tls_x509_cert_dir) as well as the corresponding client-*.pem
# files described in default_tls_x509_cert_dir.
#
# If this option is not supplied, it will be set to the value of
# "default_tls_x509_verify".
#
#migrate_tls_x509_verify = 1


# Uncomment and use the following option to override the default secret
# UUID provided in the default_tls_x509_secret_uuid parameter.
#
# NB This default all-zeros UUID will not work. Replace it with the
# output from the UUID for the TLS secret from a 'virsh secret-list'
# command and then uncomment the entry
#
#migrate_tls_x509_secret_uuid = "00000000-0000-0000-0000-000000000000"


# By default, if no graphical front end is configured, libvirt will disable
# QEMU audio output since directly talking to alsa/pulseaudio may not work
# with various security settings. If you know what you're doing, enable
# the setting below and libvirt will passthrough the QEMU_AUDIO_DRV
# environment variable when using nographics.
#
#nographics_allow_host_audio = 1


# Override the port for creating both VNC and SPICE sessions (min).
# This defaults to 5900 and increases for consecutive sessions
# or when ports are occupied, until it hits the maximum.
#
# Minimum must be greater than or equal to 5900 as lower number would
# result into negative vnc display number.
#
# Maximum must be less than 65536, because higher numbers do not make
# sense as a port number.
#
#remote_display_port_min = 5900
#remote_display_port_max = 65535

# VNC WebSocket port policies, same rules apply as with remote display
# ports.  VNC WebSockets use similar display <-> port mappings, with
# the exception being that ports start from 5700 instead of 5900.
#
#remote_websocket_port_min = 5700
#remote_websocket_port_max = 65535

# 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. It's also possible to use more than one security
# driver at the same time, for this use a list of names separated by
# comma and delimited by square brackets. For example:
#
#       security_driver = [ "selinux", "apparmor" ]
#
# Notes: The DAC security driver is always enabled; as a result, the
# value of security_driver cannot contain "dac".  The value "none" is
# a special value; security_driver can be set to that value in
# isolation, but it cannot appear in a list of drivers.
#
#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 for QEMU processes run by the system instance. It can be
# specified as a user name or as a user id. The qemu driver will try to
# parse this value first as a name and then, if the name doesn't exist,
# as a user id.
#
# Since a sequence of digits is a valid user name, a leading plus sign
# can be used to ensure that a user id will not be interpreted as a user
# name.
#
# Some examples of valid values are:
#
#       user = "qemu"   # A user named "qemu"
#       user = "+0"     # Super user (uid=0)
#       user = "100"    # A user named "100" or a user with uid=100
#
user = "oliver"

# The group for QEMU processes run by the system instance. It can be
# specified in a similar way to user.
group = "kvm"

# 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

# Whether libvirt should remember and restore the original
# ownership over files it is relabeling. Defaults to 1, set
# to 0 to disable the feature.
#remember_owner = 1

# What cgroup controllers to make use of with QEMU guests
#
#  - 'cpu' - use for scheduler 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/rtc","/dev/hpet"
#]
#
# RDMA migration requires the following extra files to be added to the list:
#   "/dev/infiniband/rdma_cm",
#   "/dev/infiniband/issm0",
#   "/dev/infiniband/issm1",
#   "/dev/infiniband/umad0",
#   "/dev/infiniband/umad1",
#   "/dev/infiniband/uverbs0"


# 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' or 'virsh managedsave'
# 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.
#
# snapshot_image_format specifies the compression algorithm of the memory save
# image when an external snapshot of a domain is taken. This does not apply
# on disk image format. It is an error if the specified format isn't valid,
# or the requested compression program can't be found.
#
#save_image_format = "raw"
#dump_image_format = "raw"
#snapshot_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. If desired, multiple mount points can
# be specified at once, separated by comma and enclosed in square
# brackets, for example:
#
#     hugetlbfs_mount = ["/dev/hugepages2M", "/dev/hugepages1G"]
#
# The size of huge page served by specific mount point is determined by
# libvirt at the daemon startup.
#
# NB, within these mount points, guests will create memory backing
# files in a location of $MOUNTPOINT/libvirt/qemu
#
#hugetlbfs_mount = "/dev/hugepages"


# Path to the setuid helper for creating tap devices.  This executable
# is used to create <source type='bridge'> interfaces when libvirtd is
# running unprivileged.  libvirt invokes the helper directly, instead
# of using "-netdev bridge", for security reasons.
#bridge_helper = "/usr/lib/qemu/qemu-bridge-helper"



# 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 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

# If max_threads_per_process is set to a positive integer, libvirt
# will use it to set the maximum number of threads that can be
# created by a qemu process. Some VM configurations can result in
# qemu processes with tens of thousands of threads. systemd-based
# systems typically limit the number of threads per process to
# 16k. max_threads_per_process can be used to override default
# limits in the host OS.
#
#max_threads_per_process = 0

# If max_core is set to a non-zero integer, then QEMU will be
# permitted to create core dumps when it crashes, provided its
# RAM size is smaller than the limit set.
#
# Be warned that the core dump will include a full copy of the
# guest RAM, if the 'dump_guest_core' setting has been enabled,
# or if the guest XML contains
#
#   <memory dumpcore="on">...guest ram...</memory>
#
# If guest RAM is to be included, ensure the max_core limit
# is set to at least the size of the largest expected guest
# plus another 1GB for any QEMU host side memory mappings.
#
# As a special case it can be set to the string "unlimited" to
# to allow arbitrarily sized core dumps.
#
# By default the core dump size is set to 0 disabling all dumps
#
# Size is a positive integer specifying bytes or the
# string "unlimited"
#
#max_core = "unlimited"

# Determine if guest RAM is included in QEMU core dumps. By
# default guest RAM will be excluded if a new enough QEMU is
# present. Setting this to '1' will force guest RAM to always
# be included in QEMU core dumps.
#
# This setting will be ignored if the guest XML has set the
# dumpcore attribute on the <memory> element.
#
#dump_guest_core = 1

# 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


# In order to prevent accidentally starting two domains that
# share one writable disk, libvirt offers two approaches for
# locking files. The first one is sanlock, the other one,
# virtlockd, is then our own implementation. Accepted values
# are "sanlock" and "lockd".
#
#lock_manager = "lockd"


# 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 daemon after keepalive_interval seconds of inactivity
# to check if the daemon is still responding; keepalive_count is a
# maximum number of keepalive messages that are allowed to be sent
# to the daemon 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 daemon.  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



# Use seccomp syscall sandbox in QEMU.
# 1 == seccomp enabled, 0 == seccomp disabled
#
# If it is unset (or -1), then seccomp will be enabled
# only if QEMU >= 2.11.0 is detected, otherwise it is
# left disabled. This ensures the default config gets
# protection for new QEMU using the blacklist approach.
#
#seccomp_sandbox = 1


# Override the listen address for all incoming migrations. Defaults to
# 0.0.0.0, or :: if both host and qemu are capable of IPv6.
#migration_address = "0.0.0.0"


# The default hostname or IP address which will be used by a migration
# source for transferring migration data to this host.  The migration
# source has to be able to resolve this hostname and connect to it so
# setting "localhost" will not work.  By default, the host's configured
# hostname is used.
#migration_host = "host.example.com"


# Override the port range used for incoming migrations.
#
# Minimum must be greater than 0, however when QEMU is not running as root,
# setting the minimum to be lower than 1024 will not work.
#
# Maximum must not be greater than 65535.
#
#migration_port_min = 49152
#migration_port_max = 49215



# Timestamp QEMU's log messages (if QEMU supports it)
#
# Defaults to 1.
#
#log_timestamp = 0


# Location of master nvram file
#
# This configuration option is obsolete. Libvirt will follow the
# QEMU firmware metadata specification to automatically locate
# firmware images. See docs/interop/firmware.json in the QEMU
# source tree. These metadata files are distributed alongside any
# firmware images intended for use with QEMU.
#
# NOTE: if ANY firmware metadata files are detected, this setting
# will be COMPLETELY IGNORED.
#
# ------------------------------------------
#
# When a domain is configured to use UEFI instead of standard
# BIOS it may use a separate storage for UEFI variables. If
# that's the case libvirt creates the variable store per domain
# using this master file as image. Each UEFI firmware can,
# however, have different variables store. Therefore the nvram is
# a list of strings when a single item is in form of:
#   ${PATH_TO_UEFI_FW}:${PATH_TO_UEFI_VARS}.
# Later, when libvirt creates per domain variable store, this list is
# searched for the master image. The UEFI firmware can be called
# differently for different guest architectures. For instance, it's OVMF
# for x86_64 and i686, but it's AAVMF for aarch64. The libvirt default
# follows this scheme.
#nvram = [
#   "/usr/share/OVMF/OVMF_CODE.fd:/usr/share/OVMF/OVMF_VARS.fd",
#   "/usr/share/OVMF/OVMF_CODE.secboot.fd:/usr/share/OVMF/OVMF_VARS.fd",
#   "/usr/share/AAVMF/AAVMF_CODE.fd:/usr/share/AAVMF/AAVMF_VARS.fd",
#   "/usr/share/AAVMF/AAVMF32_CODE.fd:/usr/share/AAVMF/AAVMF32_VARS.fd"
#]

# The backend to use for handling stdout/stderr output from
# QEMU processes.
#
#  'file': QEMU writes directly to a plain file. This is the
#          historical default, but allows QEMU to inflict a
#          denial of service attack on the host by exhausting
#          filesystem space
#
#  'logd': QEMU writes to a pipe provided by virtlogd daemon.
#          This is the current default, providing protection
#          against denial of service by performing log file
#          rollover when a size limit is hit.
#
#stdio_handler = "logd"

# QEMU gluster libgfapi log level, debug levels are 0-9, with 9 being the
# most verbose, and 0 representing no debugging output.
#
# The current logging levels defined in the gluster GFAPI are:
#
#    0 - None
#    1 - Emergency
#    2 - Alert
#    3 - Critical
#    4 - Error
#    5 - Warning
#    6 - Notice
#    7 - Info
#    8 - Debug
#    9 - Trace
#
# Defaults to 4
#
#gluster_debug_level = 9

# To enhance security, QEMU driver is capable of creating private namespaces
# for each domain started. Well, so far only "mount" namespace is supported. If
# enabled it means qemu process is unable to see all the devices on the system,
# only those configured for the domain in question. Libvirt then manages
# devices entries throughout the domain lifetime. This namespace is turned on
# by default.
#namespaces = [ "mount" ]

# This directory is used for memoryBacking source if configured as file.
# NOTE: big files will be stored here
#memory_backing_dir = "/var/lib/libvirt/qemu/ram"

# Path to the SCSI persistent reservations helper. This helper is
# used whenever <reservations/> are enabled for SCSI LUN devices.
#pr_helper = "/usr/bin/qemu-pr-helper"

# Path to the SLIRP networking helper.
#slirp_helper = "/usr/bin/slirp-helper"

# User for the swtpm TPM Emulator
#
# Default is 'tss'; this is the same user that tcsd (TrouSerS) installs
# and uses; alternative is 'root'
#
#swtpm_user = "tss"
#swtpm_group = "tss"

# For debugging and testing purposes it's sometimes useful to be able to disable
# libvirt behaviour based on the capabilities of the qemu process. This option
# allows to do so. DO _NOT_ use in production and beaware that the behaviour
# may change across versions.
#
#capability_filters = [ "capname" ]

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#2 2020-03-23 12:09:02

sabroad
Member
Registered: 2015-05-24
Posts: 242

Re: libvirt: cannot limit locked memory

Schlunze wrote:
Fehler: Domain Windows10 konnte nicht gestartet werden
Fehler: internal error: Process exited prior to exec: libvirt:  error : cannot limit locked memory to 18253611008: Operation not permitted

VFIO requires VM DMA pages to be locked-in-memory. If you're running as non-root, check your ulimits to see if still set.

# ulimit -l

Troubleshooting - Windows hanging with bad memory error:

If Windows is hanging due to a Bad Memory error look for more details via dmesg. If the logs show something like rlimit memory exceeded, you may need to increase the max memory linux allows qemu to allocate. Assuming you are in the group kvm, adding the following to /etc/security/limits.conf and restarting the PC fixed the errors for me.

   # qemu kvm, need high memlock to allocate mem for vga-passthrough
   @kvm	hard	memlock	8388608
   @kvm	soft	memlock	8388608

--
saint_abroad

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