The tcg_constant_folding folding ends up doing all the optimizations
(which is a good thing to avoid looping on all ops multiple time), so
make it clear and just rename it tcg_optimize.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433447607-31184-6-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

Most of the calls to tcg_opt_gen_mov are preceeded by a test to check if
the source temp is a constant. Fold that into the tcg_opt_gen_mov
function.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433495958-9508-1-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

Each call to tcg_opt_gen_mov is preceeded by a test to check if the
source and destination temps are copies. Fold that into the
tcg_opt_gen_mov function.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433447607-31184-4-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

We can get the opcode using the TCGOp pointer. It needs to be
dereferenced, but it's anyway done a few lines below to write
the new value.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433447607-31184-3-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

We can get the opcode using the TCGOp pointer. It needs to be
dereferenced, but it's anyway done a few lines below to write
the new value.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433447607-31184-2-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

When the same temp is used twice or more as an input argument to a TCG
instruction, the dead computation code doesn't recognize the second use
as a dead temp. This is because the temp is marked as live in the same
loop where dead inputs are checked.

The fix is to split the loop in two parts. This avoid emitting a move
and using a register for the movcond instruction when used as "move if
true" on x86-64. This might bring more improvements on RISC TCG targets
which don't have outputs aliased to inputs.
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433447228-29425-3-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

For TCG ops with two outputs registers (add2, sub2, div2, div2u), when
the same input temp is used for the two inputs aliased to the two
outputs, and when these inputs are both dead, the register allocation
code wrongly assigned the same register to the same output.

This happens for example with sub2 t1, t2, t3, t3, t4, t5, when t3 is
not used anymore after the TCG op.  In that case the same register is
used for t1, t2 and t3.

The fix is to look for already allocated aliased input when allocating
a dead aliased input and check that the register is not already
used.

Cc: Richard Henderson <rth@twiddle.net>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
Message-Id: <1433447228-29425-2-git-send-email-aurelien@aurel32.net>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

Reviewed-by: NYongbok Kim <yongbok.kim@imgtec.com>
Tested-by: NYongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

The addition of MO_AMASK means that places that used inverted masks
need to be changed to use positive masks, and places that failed to
mask the intended bits need updating.
Reviewed-by: NYongbok Kim <yongbok.kim@imgtec.com>
Tested-by: NYongbok Kim <yongbok.kim@imgtec.com>
Signed-off-by: NRichard Henderson <rth@twiddle.net>

s390x/virtio-ccw: migration and virtio for 2.4

1. Migration fixups
2. virtio 9pfs

# gpg: Signature made Tue Jun  9 09:00:05 2015 BST using RSA key ID B5A61C7C
# gpg: Good signature from "Christian Borntraeger (IBM) <borntraeger@de.ibm.com>"

* remotes/borntraeger/tags/s390x-20150609:
  s390x/migration: add comment about floating point migration
  s390x/kvm: always ignore empty vcpu interrupt state
  virtio-ccw/migration: Migrate config vector for virtio devices
  virtio-ccw: add support for 9pfs
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Error reporting patches

# gpg: Signature made Tue Jun  9 06:42:15 2015 BST using RSA key ID EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"

* remotes/armbru/tags/pull-error-2015-06-09:
  vhost-user: Improve -netdev/netdev_add/-net/... error reporting
  QemuOpts: Convert qemu_opt_foreach() to Error
  QemuOpts: Drop qemu_opt_foreach() parameter abort_on_failure
  blkdebug: Simplify passing of Error through qemu_opts_foreach()
  QemuOpts: Convert qemu_opts_foreach() to Error
  QemuOpts: Drop qemu_opts_foreach() parameter abort_on_failure
  vl: Fail right after first bad -object
  vl: Print -device help at most once
  vl: Report failure to sandbox at most once
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

commit 46c804de ("s390x: move fpu regs into a subsection
of the vmstate") moved the fprs into a subsection and bumped
the version number. This will allow to not transfer fprs in
the future if necessary. Add a comment to mark the return true
as intentional.

CC: Juan Quintela <quintela@redhat.com>
CC: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1433758884-2997-1-git-send-email-borntraeger@de.ibm.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>

When -netdev vhost-user fails, it first reports a specific error, then
one or more generic ones, like this:

    $ qemu-system-x86_64 -netdev vhost-user,id=foo,chardev=xxx
    qemu-system-x86_64: -netdev vhost-user,id=foo,chardev=xxx: chardev "xxx" not found
    qemu-system-x86_64: -netdev vhost-user,id=foo,chardev=xxx: No suitable chardev found
    qemu-system-x86_64: -netdev vhost-user,id=foo,chardev=xxx: Device 'vhost-user' could not be initialized

With the command line, the messages go to stderr.  In HMP, they go to
the monitor.  In QMP, the last one becomes the error reply, and the
others go to stderr.

Convert net_init_vhost_user() and its helpers to Error.  This
suppresses the unwanted unspecific error messages, and makes the
specific error the QMP error reply.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>

Retain the function value for now, to permit selective conversion of
its callers.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

When the argument is non-zero, qemu_opt_foreach() stops on callback
returning non-zero, and returns that value.

When the argument is zero, it doesn't stop, and returns the callback's
value from the last iteration.

The two callers that pass zero could just as well pass one:

* qemu_spice_init()'s callback add_channel() either returns zero or
  exit()s.

* config_write_opts()'s callback config_write_opt() always returns
  zero.

Drop the parameter, and always stop.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

Cc: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-block@nongnu.org
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Acked-by: NKevin Wolf <kwolf@redhat.com>

Retain the function value for now, to permit selective conversion of
its callers.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Acked-by: NKevin Wolf <kwolf@redhat.com>

When the argument is non-zero, qemu_opts_foreach() stops on callback
returning non-zero, and returns that value.

When the argument is zero, it doesn't stop, and returns the bit-wise
inclusive or of all the return values.  Funky :)

The callers that pass zero could just as well pass one, because their
callbacks can't return anything but zero:

* qemu_add_globals()'s callback qdev_add_one_global()

* qemu_config_write()'s callback config_write_opts()

* main()'s callbacks default_driver_check(), drive_enable_snapshot(),
  vnc_init_func()

Drop the parameter, and always stop.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Acked-by: NKevin Wolf <kwolf@redhat.com>

Failure to create an object with -object is a fatal error.  However,
we delay the actual exit until all -object are processed.  On the one
hand, this permits detection of genuine additional errors.  On the
other hand, it can muddy the waters with uninteresting additional
errors, e.g. when a later -object tries to reference a prior one that
failed.

We generally stop right on the first bad option, so do that for
-object as well.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

We print it once for each -device help.  Not helpful.  Stop after the
first one.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

It's reported once per -sandbox on.  Stop on the first failure, like
we do for other options.

Not fixed: "-sandbox on -sandbox off" should leave the sandbox off.
It doesn't.
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

* KVM error improvement from Laurent
* CONFIG_PARALLEL fix from Mirek
* Atomic/optimized dirty bitmap access from myself and Stefan
* BUILD_DIR convenience/bugfix from Peter C
* Memory leak fix from Shannon
* SMM improvements (though still TCG only) from myself and Gerd, acked by mst

# gpg: Signature made Fri Jun  5 18:45:20 2015 BST using RSA key ID 78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream: (62 commits)
  update Linux headers from kvm/next
  atomics: add explicit compiler fence in __atomic memory barriers
  ich9: implement SMI_LOCK
  q35: implement TSEG
  q35: add test for SMRAM.D_LCK
  q35: implement SMRAM.D_LCK
  q35: add config space wmask for SMRAM and ESMRAMC
  q35: fix ESMRAMC default
  q35: implement high SMRAM
  hw/i386: remove smram_update
  target-i386: use memory API to implement SMRAM
  hw/i386: add a separate region that tracks the SMRAME bit
  target-i386: create a separate AddressSpace for each CPU
  vl: run "late" notifiers immediately
  qom: add object_property_add_const_link
  vl: allow full-blown QemuOpts syntax for -global
  pflash_cfi01: add secure property
  pflash_cfi01: change to new-style MMIO accessors
  pflash_cfi01: change big-endian property to BIT type
  target-i386: wake up processors that receive an SMI
  ...
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

# gpg: Signature made Fri Jun  5 20:59:07 2015 BST using RSA key ID AAFC390E
# gpg: Good signature from "John Snow (John Huston) <jsnow@redhat.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: FAEB 9711 A12C F475 812F  18F2 88A9 064D 1835 61EB
#      Subkey fingerprint: F9B7 ABDB BCAC DF95 BE76  CBD0 7DEF 8106 AAFC 390E

* remotes/jnsnow/tags/ide-pull-request:
  macio: remove remainder_len DBDMA_io property
  macio: update comment/constants to reflect the new code
  macio: switch pmac_dma_write() over to new offset/len implementation
  macio: switch pmac_dma_read() over to new offset/len implementation
  fdc-test: Test state for existing cases more thoroughly
  fdc: Fix MSR.RQM flag
  fdc: Disentangle phases in fdctrl_read_data()
  fdc: Code cleanup in fdctrl_write_data()
  fdc: Use phase in fdctrl_write_data()
  fdc: Introduce fdctrl->phase
  fdc: Rename fdctrl_set_fifo() to fdctrl_to_result_phase()
  fdc: Rename fdctrl_reset_fifo() to fdctrl_to_command_phase()
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

As of commit 076b35b5 (machine: add default_ram_size to machine
class) we no longer have a global default ram size, but instead
machine specific defaults.  When invoking qemu --help we don't know
which machine you selected, so we can't tell the user the default RAM
size in the help text anymore now.

Thus I don't see an easy way to expose the default ram size to the
user in the help text.  The easiest option IMHO is to just drop this
piece of information.
Reported-by: NLaurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>
Acked-by: NLaurent Desnogues <laurent.desnogues@gmail.com>
Acked-by: NNikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Message-id: 1433495103-62084-1-git-send-email-agraf@suse.de
[PMM: rewrapped long commit message lines]
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Commit 65207c59 accidentally dropped a line of code we need along with
a comment that became wrong then.  This made QMP reject "id":

    {"execute": "system_reset", "id": "1"}
    {"error": {"class": "GenericError", "desc": "QMP input object member 'id' is unexpected"}}

Put the lost line right back, so QMP again accepts and returns "id",
as promised by the ABI:

    {"execute": "system_reset", "id": "1"}
    {"return": {}, "id": "1"}
Reported-by: NFabio Fantoni <fabio.fantoni@m2r.biz>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NDon Slutz <dslutz@verizon.com>
Tested-by: NFabio Fantoni <fabio.fantoni@m2r.biz>
Signed-off-by: NWen Congyang <wency@cn.fujitsu.com>
Signed-off-by: NPavel Fedin <p.fedin@samsung.com>
Tested-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Message-id: 1433753070-12632-2-git-send-email-armbru@redhat.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

This is kvm.git commit 05ff30bb56c6b3d3000519d6e02ed35678ddae3b.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

__atomic_thread_fence does not include a compiler barrier; in the
C++11 memory model, fences take effect in combination with other
atomic operations.  GCC implements this by making __atomic_load and
__atomic_store access memory as if the pointer was volatile, and
leaves no trace whatsoever of acquire and release fences in the
compiler's intermediate representation.

In QEMU, we want memory barriers to act on all memory, but at the same
time we would like to use __atomic_thread_fence for portability reasons.
Add compiler barriers manually around the __atomic_thread_fence.

Message-Id: <1433334080-14912-1-git-send-email-pbonzini@redhat.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Add write mask for the smi enable register, so we can disable write
access to certain bits.  Open all bits on reset.  Disable write access
to GBL_SMI_EN when SMI_LOCK (in ich9 lpc pci config space) is set.
Write access to SMI_LOCK itself is disabled too.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

TSEG provides larger amounts of SMRAM than the 128 KB available with
legacy SMRAM and high SMRAM.

Route access to tseg into nowhere when enabled, for both cpus and
busmaster dma, and add tseg window to smram region, so cpus can access
it in smm mode.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
[Fix compilation of the newly introduced test. - Paolo]
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Once the SMRAM.D_LCK bit has been set by the guest several bits in SMRAM
and ESMRAMC become readonly until the next machine reset.  Implement
this by updating the wmask accordingly when the guest sets the lock bit.
As the lock it itself is locked down too we don't need to worry about
the guest clearing the lock bit.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Not all bits in SMRAM and ESMRAMC can be changed by the guest.
Add wmask defines accordingly and set them in mch_reset().
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

The cache bits in ESMRAMC are hardcoded to 1 (=disabled) according to
the q35 mch specs.  Add and use a define with this default.

While being at it also update the SMRAM default to use the name (no code
change, just makes things a bit more readable).
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

When H_SMRAME is 1, low memory at 0xa0000 is left alone by
SMM, and instead the chipset maps the 0xa0000-0xbffff window at
0xfeda0000-0xfedbffff.  This affects both the "non-SMM" view controlled
by D_OPEN and the SMM view controlled by G_SMRAME, so add two new
MemoryRegions and toggle the enabled/disabled state of all four
in mch_update_smram.
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

It's easier to inline it now that most of its work is done by the CPU
(rather than the chipset) through /machine/smram and the memory API.
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Remove cpu_smm_register and cpu_smm_update.  Instead, each CPU
address space gets an extra region which is an alias of
/machine/smram.  This extra region is enabled or disabled
as the CPU enters/exits SMM.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

This region is exported at /machine/smram.  It is "empty" if
SMRAME=0 and points to SMRAM if SMRAME=1.  The CPU will
enable/disable it as it enters or exits SMRAM.

While touching nearby code, the existing memory region setup was
slightly inconsistent.  The smram_region is *disabled* in order to open
SMRAM (because the smram_region shows the low VRAM instead of the RAM
at 0xa0000).  Because SMRAM is closed at startup, the smram_region must
be enabled when creating the i440fx or q35 devices.
Acked-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Different CPUs can be in SMM or not at the same time, thus they
will see different things where the chipset places SMRAM.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

If a machine_init_done notifier is added late, as part of a hot-plugged
device, run it immediately.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

Suggested-by: NEduardo Habkost <ehabkost@redhat.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>