QEMU With E2K User Support
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Hugo Landau 5c1d3a2b6e Fix ast2500 protection register emulation
Some register blocks of the ast2500 are protected by protection key
registers which require the right magic value to be written to those
registers to allow those registers to be mutated.

Register manuals indicate that writing the correct magic value to these
registers should cause subsequent reads from those values to return 1,
and writing any other value should cause subsequent reads to return 0.

Previously, qemu implemented these registers incorrectly: the registers
were handled as simple memory, meaning that writing some value x to a
protection key register would result in subsequent reads from that
register returning the same value x. The protection was implemented by
ensuring that the current value of that register equaled the magic
value.

This modifies qemu to have the correct behaviour: attempts to write to a
ast2500 protection register results in a transition to 1 or 0 depending
on whether the written value is the correct magic. The protection logic
is updated to ensure that the value of the register is nonzero.

This bug caused deadlocks with u-boot HEAD: when u-boot is done with a
protectable register block, it attempts to lock it by writing the
bitwise inverse of the correct magic value, and then spinning forever
until the register reads as zero. Since qemu implemented writes to these
registers as ordinary memory writes, writing the inverse of the magic
value resulted in subsequent reads returning that value, leading to
u-boot spinning forever.

Signed-off-by: Hugo Landau <hlandau@devever.net>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Message-id: 20180220132627.4163-1-hlandau@devever.net
[PMM: fixed incorrect code indentation]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-02-22 15:12:51 +00:00
accel Miscellaneous patches for 2018-02-07 2018-02-09 14:39:09 +00:00
audio Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
backends mem: add share parameter to memory-backend-ram 2018-02-19 13:03:24 +02:00
block qcow2: Allow configuring the L2 slice size 2018-02-13 17:00:00 +01:00
bsd-user
capstone@22ead3e0bf
chardev Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
contrib virtio,vhost,pci,pc: features, fixes and cleanups 2018-02-13 16:33:31 +00:00
crypto Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
default-configs hw/net/can: Kvaser PCI CAN-S (single SJA1000 channel) emulation 2018-02-13 11:44:13 +01:00
disas target/xtensa updates: 2018-01-24 16:59:36 +00:00
docs PVRDMA implementation 2018-02-19 12:51:11 +00:00
dtc@e54388015a Update dtc to fix compilation problem on Mac OS 10.6 2018-01-10 12:53:00 +11:00
fpu fpu/softfloat: re-factor sqrt 2018-02-21 10:21:54 +00:00
fsdev Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
gdb-xml
hw Fix ast2500 protection register emulation 2018-02-22 15:12:51 +00:00
include hw/char/stm32f2xx_usart: fix TXE/TC bit handling 2018-02-22 15:12:51 +00:00
io io/channel-command: Do not kill the child process after closing the pipe 2018-02-15 16:54:57 +00:00
libdecnumber
linux-headers linux-headers: update 2018-01-22 11:07:47 +01:00
linux-user linux-user: Remove THREAD macro 2018-02-18 18:52:32 +01:00
migration migration: pass MigrationState to migrate_init() 2018-02-14 10:37:09 +00:00
nbd Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
net net/can: support for connecting to Linux host SocketCAN interface. 2018-02-13 11:44:13 +01:00
pc-bios Update OpenBIOS images to 54d959d9 built from submodule. 2018-02-22 07:55:47 +00:00
po
qapi vl: drop display_type variable 2018-02-20 12:12:05 +01:00
qga qga: use ARRAY_SIZE macro 2018-02-10 10:42:40 +03:00
qobject Include qapi/qmp/qstring.h exactly where needed 2018-02-09 13:52:15 +01:00
qom Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
replay Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
roms Update OpenBIOS images to 54d959d9 built from submodule. 2018-02-22 07:55:47 +00:00
scripts -----BEGIN PGP SIGNATURE----- 2018-02-19 16:44:12 +00:00
scsi Clean up includes 2018-02-09 05:05:11 +01:00
slirp slirp: add in6_dhcp_multicast() 2018-01-14 18:16:13 +01:00
stubs Include qmp-commands.h exactly where needed 2018-02-09 13:52:10 +01:00
target target/arm: Fix register definitions for VMIDR and VMPIDR 2018-02-22 15:12:51 +00:00
tcg tcg/aarch64: Add vector operations 2018-02-08 15:54:08 +00:00
tests Migration pull 20180214 2018-02-16 12:51:40 +00:00
trace Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
ui ui: Reorder vte terminal packing to avoid gtk3 warnings 2018-02-20 12:16:11 +01:00
util mem: add share parameter to memory-backend-ram 2018-02-19 13:03:24 +02:00
.dir-locals.el
.editorconfig
.exrc
.gdbinit
.gitignore contrib/vhost-user-blk: introduce a vhost-user-blk sample application 2018-01-18 21:52:37 +02:00
.gitmodules pc-bios: Add hppa-firmware.img and git submodule 2018-01-31 05:30:50 -08:00
.mailmap mailmap: set preferred spelling for Daniel Berrangé 2018-02-10 10:08:48 +03:00
.shippable.yml
.travis.yml travis: use libgcc-4.8-dev (libgcc-6-dev is not available on Ubuntu 14.04) 2018-02-13 16:15:09 +01:00
arch_init.c target/hppa: Skeleton support for hppa-softmmu 2018-01-30 10:08:18 -08:00
balloon.c Drop superfluous includes of qapi/qmp/qjson.h 2018-02-09 13:52:15 +01:00
block.c block: Simplify bdrv_can_write_zeroes_with_unmap() 2018-02-09 12:32:44 -06:00
blockdev-nbd.c Drop superfluous includes of qapi/qmp/qerror.h 2018-02-09 13:51:35 +01:00
blockdev.c block: maintain persistent disabled bitmaps 2018-02-13 16:59:58 +01:00
blockjob.c Drop superfluous includes of qapi/qmp/qjson.h 2018-02-09 13:52:15 +01:00
bootdevice.c
bt-host.c
bt-vhci.c
Changelog
CODING_STYLE
configure hw/rdma: Implementation of generic rdma device layers 2018-02-19 13:03:24 +02:00
COPYING
COPYING.LIB
COPYING.PYTHON
cpus-common.c
cpus.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
device_tree.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
device-hotplug.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
disas.c
dma-helpers.c
dump.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
exec.c mem: add share parameter to memory-backend-ram 2018-02-19 13:03:24 +02:00
gdbstub.c gdbstub: add tracing 2017-12-18 14:37:36 +00:00
HACKING
hmp-commands-info.hx target/m68k: add HMP command "info tlb" 2018-01-25 16:02:25 +01:00
hmp-commands.hx migration: improve documentation of postcopy-ram 2018-02-14 10:23:15 +00:00
hmp.c Include qapi/qmp/qdict.h exactly where needed 2018-02-09 13:52:15 +01:00
hmp.h Include qapi/qmp/qdict.h exactly where needed 2018-02-09 13:52:15 +01:00
ioport.c
iothread.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
LICENSE
MAINTAINERS MAINTAINERS: add entry for hw/rdma 2018-02-19 13:03:24 +02:00
Makefile allow to build with older sed 2018-02-15 16:54:57 +00:00
Makefile.objs hw/rdma: Implementation of PVRDMA device 2018-02-19 13:03:24 +02:00
Makefile.target tcg: Add generic vector expanders 2018-02-08 15:54:05 +00:00
memory_ldst.inc.c
memory_mapping.c Replace all occurances of __FUNCTION__ with __func__ 2018-01-22 09:46:18 +01:00
memory.c mem: add share parameter to memory-backend-ram 2018-02-19 13:03:24 +02:00
module-common.c
monitor.c monitor.c: Fix infinite loop in monitor's auto-complete 2018-02-16 17:36:16 +00:00
numa.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
os-posix.c
os-win32.c
qapi-schema.json qapi-schema.json: spelling (independant comparation) 2018-02-10 10:02:30 +03:00
qdev-monitor.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
qdict-test-data.txt
qemu-bridge-helper.c
qemu-doc.texi vl: deprecate -no-frame 2018-02-20 12:11:36 +01:00
qemu-ga.texi
qemu-img-cmds.hx
qemu-img.c Include qapi/qmp/qbool.h exactly where needed 2018-02-09 13:52:15 +01:00
qemu-img.texi qemu-img: Document --force-share / -U 2018-02-13 12:27:17 +01:00
qemu-io-cmds.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
qemu-io.c qemu-io: fix EOF Ctrl-D handling in qemu-io readline code 2018-02-13 12:27:17 +01:00
qemu-keymap.c Drop superfluous includes of qapi-types.h and test-qapi-types.h 2018-02-09 05:05:11 +01:00
qemu-nbd.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
qemu-nbd.texi
qemu-option-trace.texi
qemu-options-wrapper.h qemu-options: Remove stray colons from output of --help 2017-12-20 09:04:27 +01:00
qemu-options.h
qemu-options.hx mem: add share parameter to memory-backend-ram 2018-02-19 13:03:24 +02:00
qemu-seccomp.c
qemu-tech.texi
qemu.nsi
qemu.sasl
qmp.c Move include qemu/option.h from qemu-common.h to actual users 2018-02-09 13:52:16 +01:00
qtest.c
README maint: Mention web site maintenance in README 2018-02-10 10:20:01 +03:00
replication.c
replication.h
rules.mak Revert "build-sys: silence make by default or V=0" 2018-02-13 11:44:13 +01:00
thunk.c
tpm.c Include qapi/error.h exactly where needed 2018-02-09 13:50:17 +01:00
trace-events trace: avoid SystemTap "char const" warnings 2018-02-19 13:09:44 +00:00
VERSION
version.rc
vl.c vl: drop display_type variable 2018-02-20 12:12:05 +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:

  https://qemu.org/Hosts/Linux
  https://qemu.org/Hosts/Mac
  https://qemu.org/Hosts/W32


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

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

   git clone git://git.qemu.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

  https://qemu.org/Contribute/SubmitAPatch
  https://qemu.org/Contribute/TrivialPatches

The QEMU website is also maintained under source control.

  git clone git://git.qemu.org/qemu-web.git
  https://www.qemu.org/2017/02/04/the-new-qemu-website-is-up/

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:

  https://qemu.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
   https://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:

  https://qemu.org/Contribute/StartHere

-- End