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Daniel P. Berrange 1ce36bfe64 i386: expose "TCGTCGTCGTCG" in the 0x40000000 CPUID leaf
Currently when running KVM, we expose "KVMKVMKVM\0\0\0" in
the 0x40000000 CPUID leaf. Other hypervisors (VMWare,
HyperV, Xen, BHyve) all do the same thing, which leaves
TCG as the odd one out.

The CPUID signature is used by software to detect which
virtual environment they are running in and (potentially)
change behaviour in certain ways. For example, systemd
supports a ConditionVirtualization= setting in unit files.
The virt-what command can also report the virt type it is
running on

Currently both these apps have to resort to custom hacks
like looking for 'fw-cfg' entry in the /proc/device-tree
file to identify TCG.

This change thus proposes a signature "TCGTCGTCGTCG" to be
reported when running under TCG.

To hide this, the -cpu option tcg-cpuid=off can be used.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-Id: <20170509132736.10071-3-berrange@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2017-07-17 15:41:30 -03:00
accel translate-all: remove redundant !tcg_enabled check in dump_exec_info 2017-07-14 12:04:42 +02:00
audio audio: st_rate_flow exist a infinite loop 2017-07-17 11:08:59 +02:00
backends memory: Rename memory_region_init_ram() to memory_region_init_ram_nomigrate() 2017-07-14 17:59:42 +01:00
block ssh: support I/O from any AioContext 2017-07-17 11:34:20 +08:00
bsd-user qom/cpu: remove host_tid field 2017-07-14 12:04:41 +02:00
chardev * gdbstub fixes (Alex) 2017-07-14 12:16:09 +01:00
contrib vhost-user-scsi: Introduce a vhost-user-scsi sample application 2017-06-15 11:18:40 +02:00
crypto block: pass option prefix down to crypto layer 2017-07-11 17:44:56 +02:00
default-configs vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
disas disas/microblaze: Add missing 'const' attributes 2017-07-04 09:22:20 +02:00
docs docs/devel/memory.txt: Add section about RAM migration 2017-07-14 17:59:42 +01:00
dtc@558cd81bdd dtc: Revert unintentional submodule downgrade from commit c2cabb3422 2017-03-16 14:11:15 +00:00
fpu softfloat: define floatx80_round() 2017-06-29 20:27:39 +02:00
fsdev 9pfs: local: Add support for custom fmode/dmode in 9ps mapped security modes 2017-06-29 15:11:50 +02:00
gdb-xml s390x/gdb: add gs registers 2017-07-14 12:29:49 +02:00
hw fw_cfg: move QOM type defines and fw_cfg types into fw_cfg.h 2017-07-17 15:41:30 -03:00
include i386: expose "TCGTCGTCGTCG" in the 0x40000000 CPUID leaf 2017-07-17 15:41:30 -03:00
io io: preserve ipv4/ipv6 flags when resolving InetSocketAddress 2017-07-14 14:28:29 +01:00
libdecnumber libdecnumber: Clean up includes 2016-02-16 14:29:27 +00:00
linux-headers linux-headers: update to 4.13-rc0 2017-07-14 12:29:10 +02:00
linux-user qom/cpu: remove host_tid field 2017-07-14 12:04:41 +02:00
migration migration: Make compression_threads use save/load_setup/cleanup() 2017-07-10 17:52:21 +01:00
nbd nbd: Implement NBD_INFO_BLOCK_SIZE on client 2017-07-14 12:04:42 +02:00
net * gdbstub fixes (Alex) 2017-07-14 12:16:09 +01:00
pc-bios ui: vnc and keymap updates for 2.10 2017-07-17 16:31:31 +01:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: add missing translations in de, fr, it, zh 2016-12-14 18:47:19 +00:00
qapi block: add bdrv_measure() API 2017-07-11 17:45:00 +02:00
qga qga-win32: Fix memory leak of device information set 2017-07-11 11:18:37 +03:00
qobject json: learn to parse uint64 numbers 2017-06-20 14:31:31 +02:00
qom qom: Fix ambiguous path detection when ambiguous=NULL 2017-07-17 15:41:30 -03:00
replay -----BEGIN PGP SIGNATURE----- 2017-06-05 10:09:14 +01:00
roms Pull request 2017-07-17 15:05:29 +01:00
scripts device-crash-test: Fix regexp on whitelist 2017-07-17 15:41:29 -03:00
slirp slirp: Handle error returns from sosendoob() 2017-07-15 14:28:25 +02:00
stubs migration: Move check_migratable() into qdev.c 2017-05-17 12:04:59 +02:00
target i386: expose "TCGTCGTCGTCG" in the 0x40000000 CPUID leaf 2017-07-17 15:41:30 -03:00
tcg tcg/mips: Bugfix for crash when running program with qemu-i386. 2017-07-09 21:11:38 -10:00
tests qom: Fix ambiguous path detection when ambiguous=NULL 2017-07-17 15:41:30 -03:00
trace Convert error_report() to warn_report() 2017-07-13 13:49:58 +02:00
ui vnc: Set default kbd delay to 10ms 2017-07-17 11:35:27 +02:00
util coroutine-lock: add qemu_co_rwlock_downgrade and qemu_co_rwlock_upgrade 2017-07-17 11:28:15 +08:00
.dir-locals.el Add .dir-locals.el file to configure emacs coding style 2015-10-08 19:46:01 +03:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gdbinit .gdbinit: load QEMU sub-commands when gdb starts 2017-06-07 14:38:45 +01:00
.gitignore vhost-user-scsi: Introduce vhost-user-scsi host device 2017-06-15 11:18:40 +02:00
.gitmodules Add QemuMacDrivers as submodule 2017-05-11 09:45:15 +10:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.shippable.yml shippable: add mipsel target 2017-06-21 15:03:06 +01:00
.travis.yml travis: add no-TCG build 2017-07-17 11:34:20 +08:00
arch_init.c audio: Rename hw/audio/audio.h to hw/audio/soundhw.h 2017-05-19 10:48:54 +02:00
atomic_template.h tcg: Add atomic128 helpers 2016-10-26 08:29:01 -07:00
balloon.c trace: switch to modular code generation for sub-directories 2017-01-31 17:11:18 +00:00
block.c Error reporting patches for 2017-07-13 2017-07-14 09:36:40 +01:00
blockdev-nbd.c nbd: Fix regression on resiliency to port scan 2017-06-15 11:04:05 +02:00
blockdev.c Error reporting patches for 2017-07-13 2017-07-14 09:36:40 +01:00
blockjob.c fix: avoid an infinite loop or a dangling pointer problem in img_commit 2017-06-26 14:54:46 +02:00
bootdevice.c Makefile: Move bootdevice.o to common-obj-y 2017-07-04 14:39:27 +02:00
bt-host.c all: Clean up includes 2016-02-04 17:41:30 +00:00
bt-vhci.c all: Clean up includes 2016-02-04 17:41:30 +00:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: Mention preferred comment form 2017-02-28 09:03:38 +03:00
configure s390x/kvm/migration/cpumodel: fixes, enhancements and cleanups 2017-07-14 14:19:35 +01:00
COPYING
COPYING.LIB Update FSF address in GPL/LGPL boilerplate 2009-01-04 22:05:52 +00:00
cpus-common.c *_run_on_cpu: introduce run_on_cpu_data type 2016-10-31 15:00:25 +01:00
cpus.c Convert error_report() to warn_report() 2017-07-13 13:49:58 +02:00
device_tree.c device_tree: fix compiler warnings (clang 5) 2017-05-07 09:57:51 +03:00
device-hotplug.c blockdev: Split monitor reference from BB creation 2016-03-17 15:47:56 +01:00
disas.c Fix Thumb-1 BE32 execution and disassembly. 2017-02-07 18:29:59 +00:00
dma-helpers.c block: explicitly acquire aiocontext in bottom halves that need it 2017-02-21 11:39:39 +00:00
dump.c dump: Acquire BQL around vm_start() in dump thread 2017-05-05 12:10:00 +02:00
exec.c cpu: Convert to DEFINE_PROP_LINK 2017-07-14 12:04:43 +02:00
gdbstub.c gdbstub: don't fail on vCont; C04:0; c packets 2017-07-14 12:04:41 +02:00
HACKING HACKING: document #include order 2017-01-03 16:38:47 +00:00
hax-stub.c Plumb the HAXM-based hardware acceleration support 2017-01-19 22:07:46 +01:00
hmp-commands-info.hx s390x/migration: Monitor commands for storage attributes 2017-07-14 12:29:47 +02:00
hmp-commands.hx s390x/kvm/migration/cpumodel: fixes, enhancements and cleanups 2017-07-14 14:19:35 +01:00
hmp.c ui: vnc and keymap updates for 2.10 2017-07-17 16:31:31 +01:00
hmp.h hmp: add hmp analogue for qmp-chardev-change 2017-07-14 11:04:34 +02:00
ioport.c trace: switch to modular code generation for sub-directories 2017-01-31 17:11:18 +00:00
iothread.c monitor: add poll-* properties into query-iothreads result 2017-02-21 18:29:01 +00:00
LICENSE vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00
MAINTAINERS MAINTAINERS: add entry for "Unimplemented" device 2017-07-14 11:04:33 +02:00
Makefile pc-bios/s390: add s390-netboot.img 2017-07-14 12:29:48 +02:00
Makefile.objs backends: remove empty trace-events file 2017-07-11 09:35:11 +01:00
Makefile.target tcg: add the CONFIG_TCG into Makefiles 2017-07-05 09:12:44 +02:00
memory_ldst.inc.c exec: introduce memory_ldst.inc.c 2016-12-22 16:00:23 +01:00
memory_mapping.c dump: fix memory_mapping_filter leak 2017-06-04 18:42:55 +03:00
memory.c memory.h: Add memory_region_init_{ram, rom, rom_device}() handling migration 2017-07-14 17:59:42 +01:00
module-common.c all: Clean up includes 2016-02-04 17:41:30 +00:00
monitor.c s390x/kvm/migration/cpumodel: fixes, enhancements and cleanups 2017-07-14 14:19:35 +01:00
numa.c memory: Rename memory_region_init_ram() to memory_region_init_ram_nomigrate() 2017-07-14 17:59:42 +01:00
os-posix.c use g_path_get_dirname instead of dirname 2016-07-17 09:59:21 +02:00
os-win32.c shutdown: Add source information to SHUTDOWN and RESET 2017-05-23 13:28:17 +02:00
qapi-schema.json char: chardevice hotswap 2017-07-14 11:04:33 +02:00
qdev-monitor.c migration: Move remaining exported functions to migration/misc.h 2017-06-13 11:00:45 +02:00
qdict-test-data.txt Introduce QDict test data file 2009-09-04 09:37:34 -05:00
qemu-bridge-helper.c all: Remove unnecessary glib.h includes 2016-06-07 18:19:24 +03:00
qemu-doc.texi docs: document encryption options for qcow, qcow2 and luks 2017-07-11 17:44:57 +02:00
qemu-ga.texi qemu-ga: Remove stray 'q' in documentation 2016-10-28 18:17:23 +03:00
qemu-img-cmds.hx qemu-img: add measure subcommand 2017-07-11 17:45:01 +02:00
qemu-img.c QAPI patches for 2017-07-12 2017-07-13 16:56:06 +01:00
qemu-img.texi qemu-img: Expose PreallocMode for resizing 2017-07-11 17:45:01 +02:00
qemu-io-cmds.c block: Add PreallocMode to blk_truncate() 2017-07-11 17:45:01 +02:00
qemu-io.c block: rip out all traces of password prompting 2017-07-11 17:44:56 +02:00
qemu-nbd.c nbd: Implement NBD_INFO_BLOCK_SIZE on client 2017-07-14 12:04:42 +02:00
qemu-nbd.texi nbd: Add qemu-nbd -D for human-readable description 2016-11-02 09:28:55 +01:00
qemu-option-trace.texi docs: update manpage for stderr->log rename 2017-02-13 13:38:31 +00:00
qemu-options-wrapper.h hxtool: emit Texinfo headings as @subsection 2017-01-16 17:52:35 +01:00
qemu-options.h Clean up ill-advised or unusual header guards 2016-07-12 16:20:46 +02:00
qemu-options.hx ui: vnc and keymap updates for 2.10 2017-07-17 16:31:31 +01:00
qemu-seccomp.c seccomp: adding getrusage to the whitelist 2016-09-21 11:26:02 +02:00
qemu-tech.texi qemu-doc: merge qemu-tech and qemu-doc 2016-10-07 10:05:54 +02:00
qemu.nsi qemu-doc: merge qemu-tech and qemu-doc 2016-10-07 10:05:54 +02:00
qemu.sasl Default to GSSAPI (Kerberos) instead of DIGEST-MD5 for SASL 2017-05-09 14:41:47 +01:00
qmp.c qmp: Use ObjectProperty.type if present 2017-07-14 12:04:42 +02:00
qtest.c char: add backend hotswap handler 2017-07-14 11:04:33 +02:00
README README: Add linux to macOS build info 2017-01-24 23:26:52 +03:00
replication.c replication: Introduce new APIs to do replication operation 2016-09-13 11:00:56 +01:00
replication.h replication: Introduce new APIs to do replication operation 2016-09-13 11:00:56 +01:00
rules.mak docs: create interop/ subdirectory 2017-06-15 11:18:39 +02:00
softmmu_template.h cputlb: Tidy some macros 2016-10-26 08:29:00 -07:00
thunk.c thunk: Rename args and fields in host-target bitmask conversion code 2016-06-07 18:19:24 +03:00
tpm.c qapi: Don't special-case simple union wrappers 2016-03-18 10:29:26 +01:00
trace-events accel: move kvm related accelerator files into accel/ 2017-06-15 11:04:06 +02:00
user-exec-stub.c stubs: group stubs for user-mode emulation 2017-01-16 17:52:35 +01:00
user-exec.c user-exec: handle synchronous signals from QEMU gracefully 2017-03-28 10:50:35 +01:00
VERSION Open 2.10 development tree 2017-04-20 15:42:31 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c * gdbstub fixes (Alex) 2017-07-14 12:16:09 +01:00

         QEMU README
         ===========

QEMU is a generic and open source machine & userspace emulator and
virtualizer.

QEMU is capable of emulating a complete machine in software without any
need for hardware virtualization support. By using dynamic translation,
it achieves very good performance. QEMU can also integrate with the Xen
and KVM hypervisors to provide emulated hardware while allowing the
hypervisor to manage the CPU. With hypervisor support, QEMU can achieve
near native performance for CPUs. When QEMU emulates CPUs directly it is
capable of running operating systems made for one machine (e.g. an ARMv7
board) on a different machine (e.g. an x86_64 PC board).

QEMU is also capable of providing userspace API virtualization for Linux
and BSD kernel interfaces. This allows binaries compiled against one
architecture ABI (e.g. the Linux PPC64 ABI) to be run on a host using a
different architecture ABI (e.g. the Linux x86_64 ABI). This does not
involve any hardware emulation, simply CPU and syscall emulation.

QEMU aims to fit into a variety of use cases. It can be invoked directly
by users wishing to have full control over its behaviour and settings.
It also aims to facilitate integration into higher level management
layers, by providing a stable command line interface and monitor API.
It is commonly invoked indirectly via the libvirt library when using
open source applications such as oVirt, OpenStack and virt-manager.

QEMU as a whole is released under the GNU General Public License,
version 2. For full licensing details, consult the LICENSE file.


Building
========

QEMU is multi-platform software intended to be buildable on all modern
Linux platforms, OS-X, Win32 (via the Mingw64 toolchain) and a variety
of other UNIX targets. The simple steps to build QEMU are:

  mkdir build
  cd build
  ../configure
  make

Additional information can also be found online via the QEMU website:

  http://qemu-project.org/Hosts/Linux
  http://qemu-project.org/Hosts/Mac
  http://qemu-project.org/Hosts/W32


Submitting patches
==================

The QEMU source code is maintained under the GIT version control system.

   git clone git://git.qemu-project.org/qemu.git

When submitting patches, the preferred approach is to use 'git
format-patch' and/or 'git send-email' to format & send the mail to the
qemu-devel@nongnu.org mailing list. All patches submitted must contain
a 'Signed-off-by' line from the author. Patches should follow the
guidelines set out in the HACKING and CODING_STYLE files.

Additional information on submitting patches can be found online via
the QEMU website

  http://qemu-project.org/Contribute/SubmitAPatch
  http://qemu-project.org/Contribute/TrivialPatches


Bug reporting
=============

The QEMU project uses Launchpad as its primary upstream bug tracker. Bugs
found when running code built from QEMU git or upstream released sources
should be reported via:

  https://bugs.launchpad.net/qemu/

If using QEMU via an operating system vendor pre-built binary package, it
is preferable to report bugs to the vendor's own bug tracker first. If
the bug is also known to affect latest upstream code, it can also be
reported via launchpad.

For additional information on bug reporting consult:

  http://qemu-project.org/Contribute/ReportABug


Contact
=======

The QEMU community can be contacted in a number of ways, with the two
main methods being email and IRC

 - qemu-devel@nongnu.org
   http://lists.nongnu.org/mailman/listinfo/qemu-devel
 - #qemu on irc.oftc.net

Information on additional methods of contacting the community can be
found online via the QEMU website:

  http://qemu-project.org/Contribute/StartHere

-- End