Stefan Hajnoczi c653b67d18 include/qemu/compiler: add QEMU_UNINITIALIZED attribute macro ... The QEMU_UNINITIALIZED macro is to be used to skip the default compiler variable initialization done by -ftrivial-auto-var-init=zero. Use this in cases where there a method in the device I/O path (or other important hot paths), that has large variables on the stack. A rule of thumb is that "large" means a method with 4kb data in the local stack frame. Any variables which are KB in size, should be annotated with this attribute, to pre-emptively eliminate any potential overhead from the compiler zero'ing memory. Given that this turns off a security hardening feature, when using this to flag variables, it is important that the code is double-checked to ensure there is no possible use of uninitialized data in the method. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-id: 20250610123709.835102-2-berrange@redhat.com [DB: split off patch & rewrite guidance on when to use the annotation] Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>		2025-06-12 13:39:07 -04:00
..
accel.h	include/qemu: Remove ifndef CONFIG_USER_ONLY from accel.h	2025-04-23 14:08:44 -07:00
async-teardown.h
atomic.h	tcg: Remove TCG_OVERSIZED_GUEST	2025-02-18 07:33:42 -08:00
atomic128.h	qemu/atomic128: Include missing 'qemu/atomic.h' header	2025-03-08 09:35:06 -08:00
base64.h
bcd.h
bitmap.h	bitops.h: Define bit operations on 'uint32_t' arrays	2024-11-19 13:02:06 +00:00
bitops.h	bitops.h: Define bit operations on 'uint32_t' arrays	2024-11-19 13:02:06 +00:00
bswap.h	exec/cpu-all: remove this header	2025-04-23 15:04:57 -07:00
buffer.h
cacheflush.h	util/cacheflush.c: Update cache flushing mechanism for Emscripten	2025-05-06 16:02:04 +02:00
cacheinfo.h
chardev_open.h
co-shared-resource.h	util/co-shared-resource: Remove unused co_try_get_from_shres	2024-09-30 10:53:18 +03:00
compiler.h	include/qemu/compiler: add QEMU_UNINITIALIZED attribute macro	2025-06-12 13:39:07 -04:00
config-file.h
coroutine-core.h
coroutine-tls.h
coroutine.h	qemu/coroutine: Include missing 'qemu/atomic.h' header	2024-12-20 17:44:57 +01:00
coroutine_int.h
cpu-float.h
cpuid.h
crc-ccitt.h	license: Update deprecated SPDX tag GPL-2.0 to GPL-2.0-only	2024-09-20 10:11:59 +03:00
crc32c.h
ctype.h
cutils.h	hw/vmapple/aes: Introduce aes engine	2025-03-04 14:45:34 +01:00
datadir.h	system/datadir: Add new type constant for DTB files	2025-04-25 17:09:58 +02:00
dbus.h
defer-call.h
drm.h
envlist.h	envlist: Remove unused envlist_parse	2024-09-20 10:00:27 +03:00
error-report.h
event_notifier.h
fifo8.h	fifo8: introduce fifo8_peek() function	2024-09-13 20:11:13 +02:00
fifo32.h
filemonitor.h
futex.h	futex: Support Windows	2025-06-06 14:32:55 +02:00
guest-random.h
hbitmap.h
help-texts.h	docs: update copyright date to the year 2025	2025-01-02 07:44:28 +01:00
help_option.h
host-pci-mmio.h	include: Add a header to define host PCI MMIO functions	2025-05-08 10:21:10 -04:00
host-utils.h	target/i386: use compiler builtin to compute PF	2024-10-31 18:28:33 +01:00
hw-version.h
id.h
int128.h
interval-tree.h
iov.h	util/iov: Do not assert offset is in iov	2025-03-10 17:07:16 +08:00
iova-tree.h	include/system: Move exec/memory.h to system/memory.h	2025-04-23 14:08:21 -07:00
jhash.h
job.h	test-bdrv-drain: Fix data races	2025-04-08 15:00:01 +02:00
keyval.h
lockable.h	lockable: Do not cast function pointers	2024-05-29 12:41:56 +02:00
lockcnt.h	qemu-thread: Use futex if available for QemuLockCnt	2025-06-06 14:32:55 +02:00
log-for-trace.h
log.h	log: Add separate debug option for logging invalid memory accesses	2024-12-20 17:44:55 +01:00
madvise.h
main-loop.h	Accel & Exec patch queue	2024-12-21 11:07:00 -05:00
memalign.h
memfd.h
mmap-alloc.h
module.h
mprotect.h
notify.h
nvdimm-utils.h
option.h
option_int.h
osdep.h	include/qemu/osdep.h: Add Emscripten-specific OS dependencies	2025-05-06 16:02:04 +02:00
path.h
plugin-event.h
plugin-memory.h	include/qemu: plugin-memory.h doesn't need cpu-defs.h	2025-03-10 10:30:01 +00:00
plugin.h	plugins: save value during memory accesses	2024-09-19 15:58:01 +01:00
pmem.h	include/qemu: remove return after g_assert_not_reached()	2024-09-24 13:53:35 +02:00
processor.h
progress_meter.h
qdist.h
qemu-plugin.h	plugins: fix kdoc annotation	2025-01-17 10:45:38 +00:00
qemu-print.h
qemu-progress.h
qht.h
qsp.h
qtree.h
queue.h
range.h	util/range: Make ranges_overlap() return bool	2024-07-23 20:30:36 +02:00
ratelimit.h
rcu.h
rcu_queue.h
readline.h
reserved-region.h	include/system: Move exec/memory.h to system/memory.h	2025-04-23 14:08:21 -07:00
s390x_pci_mmio.h	util: Add functions for s390x mmio read/write	2025-05-08 10:03:07 -04:00
selfmap.h
seqlock.h
sockets.h	sockets: Remove deadcode	2024-10-22 11:44:23 +01:00
stats64.h
sys_membarrier.h
systemd.h
target-info-impl.h	qemu: Introduce target_long_bits()	2025-04-30 12:51:51 -07:00
target-info.h	qemu: Introduce target_long_bits()	2025-04-30 12:51:51 -07:00
thread-context.h
thread-posix.h	qemu-thread: Use futex for QemuEvent on Windows	2025-06-06 14:32:55 +02:00
thread-win32.h	qemu-thread: Use futex for QemuEvent on Windows	2025-06-06 14:32:55 +02:00
thread.h	qemu-thread: Document QemuEvent	2025-06-06 14:32:55 +02:00
throttle-options.h
throttle.h
timed-average.h	license: Simplify GPL-2.0-or-later license descriptions	2024-09-20 10:11:59 +03:00
timer.h	qemu/timer: Clarify timer_new*() must be freed with timer_free()	2025-02-14 08:49:06 +03:00
transactions.h
tsan.h
typedefs.h	Generic CPUs / accelerators patch queue	2025-03-07 07:39:49 +08:00
unicode.h
units.h
userfaultfd.h	util/userfaultfd: Remove unused uffd_poll_events	2024-10-08 15:28:55 -04:00
uuid.h
vfio-helpers.h
vhost-user-server.h
win_dump_defs.h
xattr.h
xxhash.h
yank.h