motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2026-01-02 04:30:32 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions
qemu/linux-user
History
Ilya Leoshkevich 892a4f6a75 linux-user: Add partial support for MADV_DONTNEED 
Currently QEMU ignores madvise(MADV_DONTNEED), which break apps that
rely on this for zeroing out memory [1]. Improve the situation by doing
a passthrough when the range in question is a host-page-aligned
anonymous mapping.

This is based on the patches from Simon Hausmann [2] and Chris Fallin
[3]. The structure is taken from Simon's patch. The PAGE_MAP_ANONYMOUS
bits are superseded by commit 26bab757d4 ("linux-user: Introduce
PAGE_ANON"). In the end the patch acts like the one from Chris: we
either pass-through the entire syscall, or do nothing, since doing this
only partially would not help the affected applications much. Finally,
add some extra checks to match the behavior of the Linux kernel [4].

[1] https://gitlab.com/qemu-project/qemu/-/issues/326
[2] https://patchew.org/QEMU/20180827084037.25316-1-simon.hausmann@qt.io/
[3] https://github.com/bytecodealliance/wasmtime/blob/v0.37.0/ci/qemu-madvise.patch
[4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/mm/madvise.c?h=v5.19-rc3#n1368

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220621144205.158452-1-iii@linux.ibm.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2022-06-24 10:00:00 +02:00
..
aarch64 linux-user/aarch64: Introduce sve_vq 2022-06-08 19:38:55 +01:00
alpha Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
arm target/arm: Change CPUArchState.thumb to bool 2022-04-22 14:44:54 +01:00
cris Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
generic linux-user/syscall: Translate TARGET_RLIMIT_RTTIME 2022-02-01 08:01:44 +01:00
hexagon Clean up decorations and whitespace around header guards 2022-05-11 16:50:32 +02:00
hppa linux-user: Move generic TARGET_RLIMIT* definitions to generic/target_resource.h 2022-02-01 08:01:38 +01:00
i386 Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
include linux-user/host/s390: Treat EX and EXRL as writes 2022-05-23 22:54:02 +02:00
m68k target/m68k: Implement TRAPcc 2022-06-02 09:35:02 +02:00
microblaze Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
mips Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
mips64 linux-user: Move generic TARGET_RLIMIT* definitions to generic/target_resource.h 2022-02-01 08:01:38 +01:00
nios2 linux-user/nios2: Handle various SIGILL exceptions 2022-04-26 08:17:05 -07:00
openrisc Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
ppc Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
riscv Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
s390x linux-user/s390x: Fix unwinding from signal handlers 2022-05-23 22:52:27 +02:00
sh4 Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
sparc Remove qemu-common.h include from most units 2022-04-06 14:31:55 +02:00
x86_64 linux-user: Move generic TARGET_RLIMIT* definitions to generic/target_resource.h 2022-02-01 08:01:38 +01:00
xtensa Replace TARGET_WORDS_BIGENDIAN 2022-04-06 10:50:37 +02:00
cpu_loop-common.h linux-user: Create special-errno.h 2021-12-19 20:47:33 -08:00
elfload.c linux-user/x86_64: Fix ELF_PLATFORM 2022-06-21 20:15:39 +02:00
errnos.c.inc linux-user: Simplify host <-> target errno conversion using macros 2021-07-12 21:53:35 +02:00
exit.c linux-user: Don't include gdbstub.h in qemu.h 2021-09-13 20:35:45 +02:00
fd-trans.c linux-user: Fix inotify on aarch64 2022-01-27 16:58:33 +01:00
fd-trans.h fd-trans: Fix race condition on reallocation of the translation table. 2021-07-12 21:54:46 +02:00
flat.h linux-user/: fix some comment spelling errors 2020-09-17 20:39:22 +02:00
flatload.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00
ioctls.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
linux_loop.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
linuxload.c linux-user: Clean up arg_start/arg_end confusion 2022-05-23 08:15:19 +02:00
loader.h linux-user: Split loader-related prototypes into loader.h 2021-09-13 20:35:44 +02:00
main.c linux-user: Clean up arg_start/arg_end confusion 2022-05-23 08:15:19 +02:00
meson.build user: move common-user includes to a subdirectory of {bsd,linux}-user/ 2022-01-12 14:08:29 +01:00
mmap.c linux-user: Add partial support for MADV_DONTNEED 2022-06-24 10:00:00 +02:00
qemu.h linux-user: Clean up arg_start/arg_end confusion 2022-05-23 08:15:19 +02:00
semihost.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00
signal-common.h linux-user: Split out helpers for sigsuspend 2022-03-22 13:06:21 +01:00
signal.c compiler.h: replace QEMU_NORETURN with G_NORETURN 2022-04-21 17:03:51 +04:00
socket.h Supply missing header guards 2019-06-12 13:20:21 +02:00
strace.c linux-user/strace: Use is_error in print_syscall_err 2022-06-02 09:35:03 +02:00
strace.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
strace.list linux-user/strace: Adjust get_thread_area for m68k 2022-06-02 09:35:03 +02:00
syscall.c linux-user: Add partial support for MADV_DONTNEED 2022-06-24 10:00:00 +02:00
syscall_defs.h linux-user: Remove the deprecated ppc64abi32 target 2022-02-09 13:29:38 +00:00
syscall_types.h linux-user: implement more loop ioctls 2021-11-29 14:54:17 +01:00
target_flat.h Supply missing header guards 2019-06-12 13:20:21 +02:00
thunk.c linux-user: Move thunk.c from top-level 2021-12-20 10:12:29 -08:00
trace-events linux-user: Rename user_force_sig tracepoint to match function name 2022-01-18 12:41:42 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
uaccess.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00
uname.c linux-user: Remove pointless CPU{ARCH}State casts 2022-05-23 22:47:20 +02:00
uname.h linux-user: Have do_syscall() use CPUArchState* instead of void* 2022-05-23 22:47:19 +02:00
user-internals.h linux-user: Add partial support for MADV_DONTNEED 2022-06-24 10:00:00 +02:00
user-mmap.h linux-user: Add partial support for MADV_DONTNEED 2022-06-24 10:00:00 +02:00
vm86.c linux-user: Split linux-user internals out of qemu.h 2021-09-13 20:35:45 +02:00