Check for EL3 before testing CPTR_EL3.EZ.  Return 0 when the exception
should be routed via AdvSIMDFPAccessTrap.  Mirror the structure of
CheckSVEEnabled more closely.

Fixes: 5be5e8edReviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Tested-by: NLaurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20181005175350.30752-3-richard.henderson@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Given that the only field defined for this new register may only
be 0, we don't actually need to change anything except the name.
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Tested-by: NLaurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20181005175350.30752-2-richard.henderson@linaro.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

A cut-and-paste error meant we were reading r4 from the v8M
callee-saves exception stack frame twice. This is harmless
since it just meant we did two memory accesses to the same
location, but it's unnecessary. Delete it.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20181002150304.2287-1-peter.maydell@linaro.org

In v7m_exception_taken() we were incorrectly using a
"LR bit EXCRET.ES is 1" check when it should be 0
(compare the pseudocode ExceptionTaken() function).
This meant we didn't stack the callee-saved registers
when tailchaining from a NonSecure to a Secure exception.

Cc: qemu-stable@nongnu.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Message-id: 20181002145940.30931-1-peter.maydell@linaro.org

In commit c79c0a31 we enabled emulation of external aborts
when the guest attempts to access a physical address with no
mapped device. In commit 4672cbd7 we suppress this for
most legacy boards to prevent breakage of previously working
guests, but we didn't suppress it in the 'virt' board, with
the rationale "we know that guests won't try to prod devices
that we don't describe in the device tree or ACPI tables". This
is mostly true, but we've had a report of a Linux guest image
that this did break. The problem seems to be that the guest
is (incorrectly) configured with a DEBUG_UART_PHYS value that
tells it there is a uart at 0x10009000 (which is true for
vexpress but not for virt), so in early bootup the kernel
probes this bogus address.

This is a misconfigured guest, so we don't need to worry
about it too much, but we can arrange that guests that ran
on QEMU v2.10 (before c79c0a31) will still run on
the "virt-2.10" board model, by suppressing external aborts
only for that version and earlier. This seems a reasonable
compromise: "virt-2.10" is supposed to behave the same way
that "virt" did in the 2.10 release, and making it do that
provides a usable workaround for guests with bugs like this.

Cc: qemu-stable@nongnu.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Message-id: 20180925144127.31965-1-peter.maydell@linaro.org
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>

The parameter of kvm_arm_init_cpreg_list() is ARMCPU instead of
CPUState, so correct the note to make it match the code.
Signed-off-by: NDongjiu Geng <gengdongjiu@huawei.com>
Message-id: 1538069046-5757-1-git-send-email-gengdongjiu@huawei.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Testing infrastructure for softfpu (not run by default).
Drop countLeadingZeros.
Fix div_floats.
Add udiv_qrnnd specializations for x86_64, s390x, ppc64 hosts.

# gpg: Signature made Fri 05 Oct 2018 19:00:09 BST
# gpg:                using RSA key 64DF38E8AF7E215F
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>"
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth/tags/pull-fpu-20181005:
  softfloat: Specialize udiv_qrnnd for ppc64
  softfloat: Specialize udiv_qrnnd for s390x
  softfloat: Specialize udiv_qrnnd for x86_64
  softfloat: Fix division
  softfloat: Replace countLeadingZeros32/64 with clz32/64
  tests/fp/fp-test: add floating point tests
  gitmodules: add berkeley's softfloat + testfloat version 3
  softfloat: remove float64_trunc_to_int
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

slirp updates

Andrew Oates (1):
  slirp: fix ICMP handling on macOS hosts

Gavin Grant (1):
  slirp: Propagate host TCP RST packet to the guest after socket
    disconnected

Peter Maydell (1):
  slirp: document mbuf pointers and sizes

# gpg: Signature made Sun 07 Oct 2018 19:04:13 BST
# gpg:                using RSA key E3F65A9E9560DB4C
# gpg: Good signature from "Samuel Thibault <samuel.thibault@aquilenet.fr>"
# gpg:                 aka "Samuel Thibault <sthibault@debian.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@gnu.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@inria.fr>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@labri.fr>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@ens-lyon.org>"
# gpg:                 aka "Samuel Thibault <samuel.thibault@u-bordeaux.fr>"
# 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: 900C B024 B679 31D4 0F82  304B D017 8C76 7D06 9EE6
#      Subkey fingerprint: 33FA 7B64 6195 01F8 CE9C  8F97 E3F6 5A9E 9560 DB4C

* remotes/thibault/tags/samuel-thibault:
  slirp: Propagate host TCP RST packet to the guest after socket disconnected
  slirp: fix ICMP handling on macOS hosts
  slirp: document mbuf pointers and sizes
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

CLI help improvements

PULLv2:
 - fix uninitialized "seentype" variable in qom-test

# gpg: Signature made Fri 05 Oct 2018 13:28:21 BST
# gpg:                using RSA key DAE8E10975969CE5
# gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>"
# gpg:                 aka "Marc-André Lureau <marcandre.lureau@gmail.com>"
# Primary key fingerprint: 87A9 BD93 3F87 C606 D276  F62D DAE8 E109 7596 9CE5

* remotes/elmarco/tags/option-pull-request:
  vl: list user creatable properties when 'help' is argument
  hostmem: add some properties description
  vl: handle -object help
  tests/qom-proplist: check class properties iterator
  tests/qom-proplist: check properties are not listed multiple times
  tests/qom-proplist: check duplicate "bv" property registration failed
  qom/object: register 'type' property as class property
  qom/object: fix iterating properties over a class
  qemu-option: improve qemu_opts_print_help() output
  qemu-option: add help fallback to print the list of options
  cutils: add qemu_pstrcmp0()
  qdev-monitor: print help to stdout
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Commit 27d92ebc handled the case where the TCP
connection is abruptly closed via a RST packet, by checking for the ECONNRESET
errno. However it does not consider the case where the connection has been
half-closed by the host (FIN/ACK), then the host socket is disconnected. For
example, if the host application calls close() on the socket, then the
application exits.

In this case, the socket still exists due to the file descriptor in SLIRP, but
it is disconnected. recv() does not indicate an error since an orderly socket
close has previously occurred. The socket will then be stuck in FIN_WAIT_2,
until the peer sends FIN/ACK or a timeout occurs. Instead we can send a RST
to the peer and transition to the CLOSED state.
Signed-off-by: NGavin Grant <gavingrant@protonmail.com>
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>

On Linux, SOCK_DGRAM+IPPROTO_ICMP sockets give only the ICMP packet when
read from.  On macOS, however, the socket acts like a SOCK_RAW socket
and includes the IP header as well.

This change strips the extra IP header from the received packet on macOS
before sending it to the guest.  SOCK_DGRAM ICMP sockets aren't
supported on other BSDs, but we enable this behavior for them as well to
treat the sockets the same as raw sockets.
Signed-off-by: NAndrew Oates <aoates@google.com>
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>

and fix confusing datasize name into gapsize in m_inc.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>

The ISA has a 128/64-bit division instruction, though it assumes the
low 64-bits of the numerator are 0, and so requires a bit more fixup
than a full 128-bit division insn.
Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

The ISA has a 128/64-bit division instruction.
Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

The ISA has a 128/64-bit division instruction.
Tested-by: NEmilio G. Cota <cota@braap.org>
Tested-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

The __udiv_qrnnd primitive that we nicked from gmp requires its
inputs to be normalized.  We were not doing that.  Because the
inputs are nearly normalized already, finishing that is trivial.

Replace div128to64 with a "proper" udiv_qrnnd, so that this
remains a reusable primitive.

Fixes: cf07323d
Fixes: https://bugs.launchpad.net/qemu/+bug/1793119Tested-by: NEmilio G. Cota <cota@braap.org>
Tested-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

Our minimum required compiler for compiling QEMU is GCC 4.1 these days,
so we can drop the support for compilers which do not provide the
__builtin_clz*() functions yet. Since the countLeadingZeros32/64 are
then identical to the clz32/64 functions, and we do not have to sync
the softloat 2 codebase with upstream anymore (softloat 3 is a complete
rewrite) we can simply replace the functions with our QEMU versions.
Suggested-by: NPeter Maydell <peter.maydell@linaro.org>
Acked-by: NAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: NThomas Huth <thuth@redhat.com>
Message-Id: <1538118095-7003-1-git-send-email-thuth@redhat.com>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

By leveraging berkeley's softfloat and testfloat.

With this we get decent coverage of softfloat.c:

$ ./fp-test -r even:	67.22% coverage
$ ./fp-test -r all:	73.11% coverage

Note that we do not yet test parts of softfloat.c that aren't
in the original softfloat library, namely:

- denormal inputs
- *_to_int16/uint16 conversions
- scalbn for fixed point
- muladd variants
- min/max
- exp2
- log2
- float*_compare (except float16_compare)
Signed-off-by: NEmilio G. Cota <cota@braap.org>
[rth: Add the new modules to git_submodules.]
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

These are BSD-licensed so we can add them as submodules.
Signed-off-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

It has not had users since f83311e4 ("target-m68k: use floatx80
internally", 2017-06-21).

Note that no other bit-width has floatX_trunc_to_int.
Reviewed-by: NAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: NEmilio G. Cota <cota@braap.org>
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

vga: edid fixes, qxl clang workaround, vga mmio subregion fix.

# gpg: Signature made Fri 05 Oct 2018 12:11:40 BST
# gpg:                using RSA key 4CB6D8EED3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"
# Primary key fingerprint: A032 8CFF B93A 17A7 9901  FE7D 4CB6 D8EE D3E8 7138

* remotes/kraxel/tags/vga-20181005-pull-request:
  edid: fix vendor default
  secondary-vga: delete mmio subregions upon exit
  hw/display/qxl: Suppress clang-7 warning about misaligned atomic operation
  edid: Ignore built binary
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Merge remote-tracking branch 'remotes/mcayland/tags/qemu-openbios.for-upstream-20181005' into staging

qemu-openbios.for-upstream queue

# gpg: Signature made Fri 05 Oct 2018 09:48:16 BST
# gpg:                using RSA key 5BC2C56FAE0F321F
# gpg: Good signature from "Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>"
# Primary key fingerprint: CC62 1AB9 8E82 200D 915C  C9C4 5BC2 C56F AE0F 321F

* remotes/mcayland/tags/qemu-openbios.for-upstream-20181005:
  Update OpenBIOS images to 441a84d3 built from submodule.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Various s390x updates:
- fix several struct definitions so that sparc hosts do not trip over
  unaligned accesses
- fence enabling huge pages for pre-3.1 machines
- sysbus init -> realize conversion
- fixes and improvements in tcg (instruction flags and AFP registers)

# gpg: Signature made Thu 04 Oct 2018 16:22:20 BST
# gpg:                using RSA key DECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>"
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>"
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20181004:
  hw/s390x/s390-pci-bus: Convert sysbus init function to realize function
  s390x/tcg: refactor specification checking
  s390x/tcg: fix FP register pair checks
  s390x/tcg: handle privileged instructions via flags
  s390x/tcg: check for AFP-register, BFP and DFP data exceptions
  s390x/tcg: add instruction flags for floating point instructions
  s390x/tcg: support flags for instructions
  s390x/tcg: store in the TB flags if AFP is enabled
  s390x/tcg: factor out and fix DATA exception injection
  s390x: move tcg_s390_program_interrupt() into TCG code and mark it noreturn
  target/s390x: exception on non-aligned LPSW(E)
  s390x: Fence huge pages prior to 3.1
  hw/s390x/ioinst: Fix alignment problem in struct SubchDev
  hw/s390x/css: Remove QEMU_PACKED from struct SenseId
  hw/s390x/ipl: Fix alignment problems of S390IPLState members
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

nbd patches for 2018-10-03

Fix bugs in NBD_CMD_CACHE, drop support for oldstyle NBD server,
minor build and doc fixes

- Denis V. Lunev: nbd: fix NBD_CMD_CACHE negitiation... [retitled]
- Vladimir Sementsov-Ogievskiy: 0/2 server: drop old-style negotiation
- Eric Blake: qemu-nbd: Document --tls-creds
- Vladimir Sementsov-Ogievskiy: nbd/server: fix NBD_CMD_CACHE
- Peter Maydell: nbd: Don't take address of fields in packed structs

# gpg: Signature made Thu 04 Oct 2018 15:19:32 BST
# gpg:                using RSA key A7A16B4A2527436A
# gpg: Good signature from "Eric Blake <eblake@redhat.com>"
# gpg:                 aka "Eric Blake (Free Software Programmer) <ebb9@byu.net>"
# gpg:                 aka "[jpeg image of size 6874]"
# Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 436A

* remotes/ericb/tags/pull-nbd-2018-10-03-v2:
  nbd: fix NBD_FLAG_SEND_CACHE value
  nbd/server: drop old-style negotiation
  qemu-nbd: drop old-style negotiation
  qemu-nbd: Document --tls-creds
  nbd/server: fix NBD_CMD_CACHE
  nbd: Don't take address of fields in packed structs
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

Iterate over the writable class properties, sort and print them out
with the description if available.

Ex: qemu -object memory-backend-file,help
memory-backend-file.align=int
memory-backend-file.discard-data=bool
memory-backend-file.dump=bool - Set to 'off' to exclude from core dump
memory-backend-file.host-nodes=int - Binds memory to the list of NUMA host nodes
memory-backend-file.mem-path=string
memory-backend-file.merge=bool - Mark memory as mergeable
memory-backend-file.pmem=bool
memory-backend-file.policy=HostMemPolicy - Set the NUMA policy
memory-backend-file.prealloc=bool - Preallocate memory
memory-backend-file.share=bool - Mark the memory as private to QEMU or shared
memory-backend-file.size=int - Size of the memory region (ex: 500M)
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

List the user creatable objects.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

This test failed before "fix iterating properties over a class".
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

And factor out a common function used by the follow class properties
iterator test.

Fix uninitialized "seentype" variable.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

"bv" is already a class property.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

Let's save a few byte in each object instance.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

object_class_property_iter_init() starts from the given class, so the
next class should continue with the parent class.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>

Modify qemu_opts_print_help():
- to print expected argument type
- skip description if not available
- sort lines
- prefix with the list name (like qdev, to avoid confusion)
- drop 16-chars alignment, use a '-' as seperator for option name and
  description

For ex, "-spice help" output is changed from:

port             No description available
tls-port         No description available
addr             No description available
[...]
gl               No description available
rendernode       No description available

to:

spice.addr=str
spice.agent-mouse=bool (on/off)
spice.disable-agent-file-xfer=bool (on/off)
[...]
spice.x509-key-password=str
spice.zlib-glz-wan-compression=str

"qemu-img create -f qcow2 -o help", changed from:

size             Virtual disk size
compat           Compatibility level (0.10 or 1.1)
backing_file     File name of a base image
[...]
lazy_refcounts   Postpone refcount updates
refcount_bits    Width of a reference count entry in bits

to:

backing_file=str - File name of a base image
backing_fmt=str - Image format of the base image
cluster_size=size - qcow2 cluster size
[...]
refcount_bits=num - Width of a reference count entry in bits
size=size - Virtual disk size
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

QDev options accept 'help' (or '?', but that's problematic with shell
globbing) in the list of parameters, which is handy to list the
available options.

Unfortunately, this isn't built in QemuOpts. qemu_opts_parse_noisily()
seems to be the common path for command line options, so place a
fallback to print help, listing the available options.

This is quite handy, for example with qemu "-spice help".
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

A char** variant of g_strcmp0().
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NThomas Huth <thuth@redhat.com>

qdev_device_help() is used from command line "-device help", or from
HMP "device_add". If used from command line, print help to stdout
(it is only printed on explicit demand).
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

Python queue, 2018-10-03

* Remove fixed serial device errors from device-crash-test
* Remove unnecessary Python 2.6 compatibility code

# gpg: Signature made Thu 04 Oct 2018 03:17:34 BST
# gpg:                using RSA key 2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/python-next-pull-request:
  scripts/device-crash-test: Remove entries for serial devices
  Revert "tests: migration/guestperf Python 2.6 argparse compatibility"
  Revert "docker.py: Python 2.6 argparse compatibility"
  device-crash-test: No need for sys.path hack
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

"EMU" actually is "Emulex Corporation", so not a good idea to use that
by default.  Lets use the Red Hat vendor id instead, which is in line
with the pci ids which are allocated from Red Hat vendor ids too.

Vendor list is available from http://www.uefi.org/pnp_id_listSigned-off-by: NGerd Hoffmann <kraxel@redhat.com>
Message-id: 20181005091934.12143-1-kraxel@redhat.com

93abfc88 introduced a reference cycle in
the vga-pci devices, preventing cleanup of the object upon hotblug.

This patch allows to break the cycle.
Signed-off-by: Nremy.noel <remy.noel@blade-group.com>
Message-id: 20181002121935.23706-1-remy.noel@blade-group.com

[ kraxel: delete the recently added edid region too ]
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

If QEMU is compiled with clang-7 it results in the warning:

hw/display/qxl.c:1884:19: error: misaligned or large atomic operation
may incur significant performance penalty [-Werror,-Watomic-alignment]
    old_pending = atomic_fetch_or(&d->ram->int_pending, le_events);
                  ^

This is because the Spice headers forgot to define the QXLRam struct
with the '__aligned__(4)' attribute.  clang 7 and newer will thus
warn that the access here to int_pending might not be 4-aligned
(because the QXLRam object d->ram points at might start at a
misaligned address).  In fact we set up d->ram in init_qxl_ram() so
it always starts at a 4K boundary, so we know the atomic access here
is OK.

Newer Spice versions (with Spice commit
beda5ec7a6848be20c0cac2a9a8ef2a41e8069c1) will fix the bug;
for older Spice versions, work around it by telling the compiler
explicitly that the alignment is OK using __builtin_assume_aligned().
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180927155538.699-1-peter.maydell@linaro.org
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>