Merge tag 'uml-for-linux-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

Pull UML updates from Johannes Berg:
 "The only really new thing is the long-standing seccomp work
  (originally from 2021!). Wven if it still isn't enabled by default due
  to security concerns it can still be used e.g. for tests.

   - remove obsolete network transports

   - remove PCI IO port support

   - start adding seccomp-based process handling instead of ptrace"

* tag 'uml-for-linux-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: (29 commits)
  um: remove "extern" from implementation of sigchld_handler
  um: fix unused variable warning
  um: fix SECCOMP 32bit xstate register restore
  um: pass FD for memory operations when needed
  um: Add SECCOMP support detection and initialization
  um: Implement kernel side of SECCOMP based process handling
  um: Track userspace children dying in SECCOMP mode
  um: Add helper functions to get/set state for SECCOMP
  um: Add stub side of SECCOMP/futex based process handling
  um: Move faultinfo extraction into userspace routine
  um: vector: Use mac_pton() for MAC address parsing
  um: vector: Clean up and modernize log messages
  um: chan_kern: use raw spinlock for irqs_to_free_lock
  MAINTAINERS: remove obsolete file entry in TUN/TAP DRIVER
  um: Fix tgkill compile error on old host OSes
  um: stop using PCI port I/O
  um: Remove legacy network transport infrastructure
  um: vector: Eliminate the dependency on uml_net
  um: Remove obsolete legacy network transports
  um/asm: Replace "REP; NOP" with PAUSE mnemonic
  ...

Author: torvalds

Documentation/virt/uml/user_mode_linux_howto_v2.rst

@@ -147,18 +147,12 @@ The image hostname will be set to the same as the host on which you
 are creating its image. It is a good idea to change that to avoid
 "Oh, bummer, I rebooted the wrong machine".
 
-UML supports two classes of network devices - the older uml_net ones
-which are scheduled for obsoletion. These are called ethX. It also
-supports the newer vector IO devices which are significantly faster
-and have support for some standard virtual network encapsulations like
-Ethernet over GRE and Ethernet over L2TPv3. These are called vec0.
+UML supports vector I/O high performance network devices which have
+support for some standard virtual network encapsulations like
+Ethernet over GRE and Ethernet over L2TPv3. These are called vecX.
 
-Depending on which one is in use, ``/etc/network/interfaces`` will
-need entries like::
-
-   # legacy UML network devices
-   auto eth0
-   iface eth0 inet dhcp
+When vector network devices are in use, ``/etc/network/interfaces``
+will need entries like::
 
    # vector UML network devices
    auto vec0
@@ -219,44 +213,23 @@ remote UML and other VM instances.
 +-----------+--------+------------------------------------+------------+
 | vde       | vector | dep. on VDE VPN: Virt.Net Locator  | varies     |
 +-----------+--------+------------------------------------+------------+
-| tuntap    | legacy | none                               | ~ 500Mbit  |
-+-----------+--------+------------------------------------+------------+
-| daemon    | legacy | none                               | ~ 450Mbit  |
-+-----------+--------+------------------------------------+------------+
-| socket    | legacy | none                               | ~ 450Mbit  |
-+-----------+--------+------------------------------------+------------+
-| ethertap  | legacy | obsolete                           | ~ 500Mbit  |
-+-----------+--------+------------------------------------+------------+
-| vde       | legacy | obsolete                           | ~ 500Mbit  |
-+-----------+--------+------------------------------------+------------+
 
 * All transports which have tso and checksum offloads can deliver speeds
   approaching 10G on TCP streams.
 
 * All transports which have multi-packet rx and/or tx can deliver pps
   rates of up to 1Mps or more.
 
-* All legacy transports are generally limited to ~600-700MBit and 0.05Mps.
-
 * GRE and L2TPv3 allow connections to all of: local machine, remote
   machines, remote network devices and remote UML instances.
 
-* Socket allows connections only between UML instances.
-
-* Daemon and bess require running a local switch. This switch may be
-  connected to the host as well.
-
 
 Network configuration privileges
 ================================
 
 The majority of the supported networking modes need ``root`` privileges.
-For example, in the legacy tuntap networking mode, users were required
-to be part of the group associated with the tunnel device.
-
-For newer network drivers like the vector transports, ``root`` privilege
-is required to fire an ioctl to setup the tun interface and/or use
-raw sockets where needed.
+For example, for vector transports, ``root`` privilege is required to fire
+an ioctl to setup the tun interface and/or use raw sockets where needed.
 
 This can be achieved by granting the user a particular capability instead
 of running UML as root.  In case of vector transport, a user can add the
@@ -610,12 +583,6 @@ connect to a local area cloud (all the UML nodes using the same
 multicast address running on hosts in the same multicast domain (LAN)
 will be automagically connected together to a virtual LAN.
 
-Configuring Legacy transports
-=============================
-
-Legacy transports are now considered obsolete. Please use the vector
-versions.
-
 ***********
 Running UML
 ***********

MAINTAINERS

@@ -25156,13 +25156,12 @@ L:	linux-parisc@vger.kernel.org
 S:	Orphan
 F:	drivers/net/ethernet/dec/tulip/
 
-TUN/TAP driver
+TUN/TAP DRIVER
 M:	Willem de Bruijn <willemdebruijn.kernel@gmail.com>
 M:	Jason Wang <jasowang@redhat.com>
 S:	Maintained
 W:	http://vtun.sourceforge.net/tun
 F:	Documentation/networking/tuntap.rst
-F:	arch/um/os-Linux/drivers/
 F:	drivers/net/tap.c
 F:	drivers/net/tun*
 

arch/um/Kconfig

@@ -52,13 +52,7 @@ config NO_IOMEM
 config UML_IOMEM_EMULATION
 	bool
 	select INDIRECT_IOMEM
-	select HAS_IOPORT
 	select GENERIC_PCI_IOMAP
-	select GENERIC_IOMAP
-	select NO_GENERIC_PCI_IOPORT_MAP
-
-config NO_IOPORT_MAP
-	def_bool !UML_IOMEM_EMULATION
 
 config ISA
 	bool

arch/um/configs/i386_defconfig

@@ -52,13 +52,6 @@ CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_INET=y
 # CONFIG_IPV6 is not set
-CONFIG_UML_NET=y
-CONFIG_UML_NET_ETHERTAP=y
-CONFIG_UML_NET_TUNTAP=y
-CONFIG_UML_NET_SLIP=y
-CONFIG_UML_NET_DAEMON=y
-CONFIG_UML_NET_MCAST=y
-CONFIG_UML_NET_SLIRP=y
 CONFIG_EXT4_FS=y
 CONFIG_QUOTA=y
 CONFIG_AUTOFS_FS=m

arch/um/configs/x86_64_defconfig

@@ -51,13 +51,6 @@ CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_INET=y
 # CONFIG_IPV6 is not set
-CONFIG_UML_NET=y
-CONFIG_UML_NET_ETHERTAP=y
-CONFIG_UML_NET_TUNTAP=y
-CONFIG_UML_NET_SLIP=y
-CONFIG_UML_NET_DAEMON=y
-CONFIG_UML_NET_MCAST=y
-CONFIG_UML_NET_SLIRP=y
 CONFIG_EXT4_FS=y
 CONFIG_QUOTA=y
 CONFIG_AUTOFS_FS=m

arch/um/drivers/Kconfig

@@ -124,206 +124,18 @@ endmenu
 menu "UML Network Devices"
 	depends on NET
 
-# UML virtual driver
-config UML_NET
-	bool "Virtual network device"
-	help
-	  While the User-Mode port cannot directly talk to any physical
-	  hardware devices, this choice and the following transport options
-	  provide one or more virtual network devices through which the UML
-	  kernels can talk to each other, the host, and with the host's help,
-	  machines on the outside world.
-
-	  For more information, including explanations of the networking and
-	  sample configurations, see
-	  <http://user-mode-linux.sourceforge.net/old/networking.html>.
-
-	  If you'd like to be able to enable networking in the User-Mode
-	  linux environment, say Y; otherwise say N.  Note that you must
-	  enable at least one of the following transport options to actually
-	  make use of UML networking.
-
-config UML_NET_ETHERTAP
-	bool "Ethertap transport (obsolete)"
-	depends on UML_NET
-	help
-	  The Ethertap User-Mode Linux network transport allows a single
-	  running UML to exchange packets with its host over one of the
-	  host's Ethertap devices, such as /dev/tap0.  Additional running
-	  UMLs can use additional Ethertap devices, one per running UML.
-	  While the UML believes it's on a (multi-device, broadcast) virtual
-	  Ethernet network, it's in fact communicating over a point-to-point
-	  link with the host.
-
-	  To use this, your host kernel must have support for Ethertap
-	  devices.  Also, if your host kernel is 2.4.x, it must have
-	  CONFIG_NETLINK_DEV configured as Y or M.
-
-	  For more information, see
-	  <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-	  has examples of the UML command line to use to enable Ethertap
-	  networking.
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-config UML_NET_TUNTAP
-	bool "TUN/TAP transport (obsolete)"
-	depends on UML_NET
-	help
-	  The UML TUN/TAP network transport allows a UML instance to exchange
-	  packets with the host over a TUN/TAP device.  This option will only
-	  work with a 2.4 host, unless you've applied the TUN/TAP patch to
-	  your 2.2 host kernel.
-
-	  To use this transport, your host kernel must have support for TUN/TAP
-	  devices, either built-in or as a module.
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-config UML_NET_SLIP
-	bool "SLIP transport (obsolete)"
-	depends on UML_NET
-	help
-	  The slip User-Mode Linux network transport allows a running UML to
-	  network with its host over a point-to-point link.  Unlike Ethertap,
-	  which can carry any Ethernet frame (and hence even non-IP packets),
-	  the slip transport can only carry IP packets.
-
-	  To use this, your host must support slip devices.
-
-	  For more information, see
-	  <http://user-mode-linux.sourceforge.net/old/networking.html>.
-	  has examples of the UML command line to use to enable slip
-	  networking, and details of a few quirks with it.
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-config UML_NET_DAEMON
-	bool "Daemon transport (obsolete)"
-	depends on UML_NET
-	help
-	  This User-Mode Linux network transport allows one or more running
-	  UMLs on a single host to communicate with each other, but not to
-	  the host.
-
-	  To use this form of networking, you'll need to run the UML
-	  networking daemon on the host.
-
-	  For more information, see
-	  <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-	  has examples of the UML command line to use to enable Daemon
-	  networking.
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-config UML_NET_DAEMON_DEFAULT_SOCK
-	string "Default socket for daemon transport"
-	default "/tmp/uml.ctl"
-	depends on UML_NET_DAEMON
-	help
-	  This option allows setting the default socket for the daemon
-	  transport, normally it defaults to /tmp/uml.ctl.
-
 config UML_NET_VECTOR
 	bool "Vector I/O high performance network devices"
-	depends on UML_NET
 	select MAY_HAVE_RUNTIME_DEPS
 	help
 	  This User-Mode Linux network driver uses multi-message send
 	  and receive functions. The host running the UML guest must have
 	  a linux kernel version above 3.0 and a libc version > 2.13.
-	  This driver provides tap, raw, gre and l2tpv3 network transports
-	  with up to 4 times higher network throughput than the UML network
-	  drivers.
-
-config UML_NET_VDE
-	bool "VDE transport (obsolete)"
-	depends on UML_NET
-	depends on !MODVERSIONS
-	select MAY_HAVE_RUNTIME_DEPS
-	help
-	  This User-Mode Linux network transport allows one or more running
-	  UMLs on a single host to communicate with each other and also
-	  with the rest of the world using Virtual Distributed Ethernet,
-	  an improved fork of uml_switch.
+	  This driver provides tap, raw, gre and l2tpv3 network transports.
 
-	  You must have libvdeplug installed in order to build the vde
-	  transport into UML.
-
-	  To use this form of networking, you will need to run vde_switch
-	  on the host.
-
-	  For more information, see <http://wiki.virtualsquare.org/>
-	  That site has a good overview of what VDE is and also examples
-	  of the UML command line to use to enable VDE networking.
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-config UML_NET_MCAST
-	bool "Multicast transport (obsolete)"
-	depends on UML_NET
-	help
-	  This Multicast User-Mode Linux network transport allows multiple
-	  UMLs (even ones running on different host machines!) to talk to
-	  each other over a virtual ethernet network.  However, it requires
-	  at least one UML with one of the other transports to act as a
-	  bridge if any of them need to be able to talk to their hosts or any
-	  other IP machines.
-
-	  To use this, your host kernel(s) must support IP Multicasting.
-
-	  For more information, see
-	  <http://user-mode-linux.sourceforge.net/old/networking.html>  That site
-	  has examples of the UML command line to use to enable Multicast
-	  networking, and notes about the security of this approach.
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-config UML_NET_SLIRP
-	bool "SLiRP transport (obsolete)"
-	depends on UML_NET
-	help
-	  The SLiRP User-Mode Linux network transport allows a running UML
-	  to network by invoking a program that can handle SLIP encapsulated
-	  packets.  This is commonly (but not limited to) the application
-	  known as SLiRP, a program that can re-socket IP packets back onto
-	  he host on which it is run.  Only IP packets are supported,
-	  unlike other network transports that can handle all Ethernet
-	  frames.  In general, slirp allows the UML the same IP connectivity
-	  to the outside world that the host user is permitted, and unlike
-	  other transports, SLiRP works without the need of root level
-	  privileges, setuid binaries, or SLIP devices on the host.  This
-	  also means not every type of connection is possible, but most
-	  situations can be accommodated with carefully crafted slirp
-	  commands that can be passed along as part of the network device's
-	  setup string.  The effect of this transport on the UML is similar
-	  that of a host behind a firewall that masquerades all network
-	  connections passing through it (but is less secure).
-
-	  NOTE: THIS TRANSPORT IS DEPRECATED AND WILL BE REMOVED SOON!!! Please
-	  migrate to UML_NET_VECTOR.
-
-	  If unsure, say N.
-
-	  Startup example: "eth0=slirp,FE:FD:01:02:03:04,/usr/local/bin/slirp"
+	  For more information, including explanations of the networking
+	  and sample configurations, see
+	  <file:Documentation/virt/uml/user_mode_linux_howto_v2.rst>.
 
 endmenu
 
@@ -367,3 +179,11 @@ config UML_PCI_OVER_VIRTIO_DEVICE_ID
 	  There's no official device ID assigned (yet), set the one you
 	  wish to use for experimentation here. The default of -1 is
 	  not valid and will cause the driver to fail at probe.
+
+config UML_PCI_OVER_VFIO
+	bool "Enable VFIO-based PCI passthrough"
+	select UML_PCI
+	help
+	  This driver provides support for VFIO-based PCI passthrough.
+	  Currently, only MSI-X capable devices are supported, and it
+	  is assumed that drivers will use MSI-X.