Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190510233729.15554-1-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
It fixes heap-use-after-free which was found by clang's ASAN.
Control flow of this use-after-free:
main_thread:
* Got SIGTERM and completes main loop
* Calls migration_shutdown
- migrate_fd_cancel (so, migration_thread begins to complete)
- object_unref(OBJECT(current_migration));
migration_thread:
* migration_iteration_finish -> schedule cleanup bh
* object_unref(OBJECT(s)); (Now, current_migration is freed)
* exits
main_thread:
* Calls vm_shutdown -> drain bdrvs -> main loop
-> cleanup_bh -> use after free
If you want to reproduce, these couple of sleeps will help:
vl.c:4613:
migration_shutdown();
+ sleep(2);
migration.c:3269:
+ sleep(1);
trace_migration_thread_after_loop();
migration_iteration_finish(s);
Original output:
qemu-system-x86_64: terminating on signal 15 from pid 31980 (<unknown process>)
=================================================================
==31958==ERROR: AddressSanitizer: heap-use-after-free on address 0x61900001d210
at pc 0x555558a535ca bp 0x7fffffffb190 sp 0x7fffffffb188
READ of size 8 at 0x61900001d210 thread T0 (qemu-vm-0)
#0 0x555558a535c9 in migrate_fd_cleanup migration/migration.c:1502:23
#1 0x5555594fde0a in aio_bh_call util/async.c:90:5
#2 0x5555594fe522 in aio_bh_poll util/async.c:118:13
#3 0x555559524783 in aio_poll util/aio-posix.c:725:17
#4 0x555559504fb3 in aio_wait_bh_oneshot util/aio-wait.c:71:5
#5 0x5555573bddf6 in virtio_blk_data_plane_stop
hw/block/dataplane/virtio-blk.c:282:5
#6 0x5555589d5c09 in virtio_bus_stop_ioeventfd hw/virtio/virtio-bus.c:246:9
#7 0x5555589e9917 in virtio_pci_stop_ioeventfd hw/virtio/virtio-pci.c:287:5
#8 0x5555589e22bf in virtio_pci_vmstate_change hw/virtio/virtio-pci.c:1072:9
#9 0x555557628931 in virtio_vmstate_change hw/virtio/virtio.c:2257:9
#10 0x555557c36713 in vm_state_notify vl.c:1605:9
#11 0x55555716ef53 in do_vm_stop cpus.c:1074:9
#12 0x55555716eeff in vm_shutdown cpus.c:1092:12
#13 0x555557c4283e in main vl.c:4617:5
#14 0x7fffdfdb482f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#15 0x555556ecb118 in _start (x86_64-softmmu/qemu-system-x86_64+0x1977118)
0x61900001d210 is located 144 bytes inside of 952-byte region
[0x61900001d180,0x61900001d538)
freed by thread T6 (live_migration) here:
#0 0x555556f76782 in __interceptor_free
/tmp/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:124:3
#1 0x555558d5fa94 in object_finalize qom/object.c:618:9
#2 0x555558d57651 in object_unref qom/object.c:1068:9
#3 0x555558a55588 in migration_thread migration/migration.c:3272:5
#4 0x5555595393f2 in qemu_thread_start util/qemu-thread-posix.c:502:9
#5 0x7fffe057f6b9 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76b9)
previously allocated by thread T0 (qemu-vm-0) here:
#0 0x555556f76b03 in __interceptor_malloc
/tmp/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:146:3
#1 0x7ffff6ee37b8 in g_malloc (/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4f7b8)
#2 0x555558d58031 in object_new qom/object.c:640:12
#3 0x555558a31f21 in migration_object_init migration/migration.c:139:25
#4 0x555557c41398 in main vl.c:4320:5
#5 0x7fffdfdb482f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
Thread T6 (live_migration) created by T0 (qemu-vm-0) here:
#0 0x555556f5f0dd in pthread_create
/tmp/final/llvm.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:210:3
#1 0x555559538cf9 in qemu_thread_create util/qemu-thread-posix.c:539:11
#2 0x555558a53304 in migrate_fd_connect migration/migration.c:3332:5
#3 0x555558a72bd8 in migration_channel_connect migration/channel.c:92:5
#4 0x555558a6ef87 in exec_start_outgoing_migration migration/exec.c:42:5
#5 0x555558a4f3c2 in qmp_migrate migration/migration.c:1922:9
#6 0x555558bb4f6a in qmp_marshal_migrate qapi/qapi-commands-migration.c:607:5
#7 0x555559363738 in do_qmp_dispatch qapi/qmp-dispatch.c:131:5
#8 0x555559362a15 in qmp_dispatch qapi/qmp-dispatch.c:174:11
#9 0x5555571bac15 in monitor_qmp_dispatch monitor.c:4124:11
#10 0x55555719a22d in monitor_qmp_bh_dispatcher monitor.c:4207:9
#11 0x5555594fde0a in aio_bh_call util/async.c:90:5
#12 0x5555594fe522 in aio_bh_poll util/async.c:118:13
#13 0x5555595201e0 in aio_dispatch util/aio-posix.c:460:5
#14 0x555559503553 in aio_ctx_dispatch util/async.c:261:5
#15 0x7ffff6ede196 in g_main_context_dispatch
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4a196)
SUMMARY: AddressSanitizer: heap-use-after-free migration/migration.c:1502:23
in migrate_fd_cleanup
Shadow bytes around the buggy address:
0x0c327fffb9f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fffba00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fffba10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fffba20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fffba30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c327fffba40: fd fd[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c327fffba50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c327fffba60: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c327fffba70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c327fffba80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c327fffba90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
Left alloca redzone: ca
Right alloca redzone: cb
Shadow gap: cc
==31958==ABORTING
Signed-off-by: Yury Kotov <yury-kotov@yandex-team.ru>
Message-Id: <20190408113343.2370-1-yury-kotov@yandex-team.ru>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Fixed up comment formatting
On source side, we have qemu_savevm_state_header() to send related data,
while on the receiving side those steps are scattered in
qemu_loadvm_state().
This patch wrap those related steps into qemu_loadvm_state_header() to
make it friendly to read.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190424004700.12766-5-richardw.yang@linux.intel.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
In migration_thread() and qemu_savevm_state(), we savevm_state in
following sequence:
qemu_savevm_state_header(f);
qemu_savevm_state_setup(f);
Then it would be more proper to loadvm_state in the save sequence.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190424004700.12766-4-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Current call flow of save_snapshot is:
save_snapshot
migration_is_blocked
qemu_savevm_state
migration_is_blocked
Since qemu_savevm_state is only called in save_snapshot, this means
migration_is_blocked has been already checked.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190424004700.12766-2-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Since the ram bitmap and the unsent bitmap are split by RAMBlock
in commit 6b6712e, it's better to update the comments about them.
Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
Message-Id: <1555311089-18610-1-git-send-email-wang.yi59@zte.com.cn>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
We can eliminate to pass 0.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190430034412.12935-2-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
We missed the iothread related args in this file.
This patch is used to fix this issue.
Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Message-Id: <20190426090730.2691-4-chen.zhang@intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Message-Id: <20190426090730.2691-3-chen.zhang@intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
The colo_do_failover no need the input parameter.
Signed-off-by: Zhang Chen <chen.zhang@intel.com>
Message-Id: <20190426090730.2691-2-chen.zhang@intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
The only caller that checks the error code is looking for != 0,
so returning false is incorrect.
Fixes: 5aaac46793 "migration: savevm: consult migration blockers"
Signed-off-by: Cole Robinson <crobinso@redhat.com>
Message-Id: <b991a4d0e6c4253bc08b2794c6084be55fc72e1d.1554851834.git.crobinso@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
subsection_found is true implies vmdesc is not NULL.
This patch remove the additional check on vmdesc and rename
subsection_found to vmdesc_has_subsections to make it more self-explain.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190403011016.12549-1-richardw.yang@linux.intel.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
MigrationState->xfer_limit is only set to 0 in migrate_init().
Remove this unnecessary field.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190326055726.10539-1-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
During each iteration, se->ops is checked before each loop. So it is not
necessary to check it again and simplify the following check a little.
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190327013130.26259-1-richardw.yang@linux.intel.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
It is error prone to use VMSTATE_UNUSED*() sometimes especially when
the size of the migration stream of the field is not the same as the
size of the structure (boolean is one example). Comment it well so
people will be aware of this when people want to use it.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20190329095713.14177-1-peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Add vector expansions for shifts by non-constant scalar.
Add vector expansions for shifts by vector.
Add integer and vector expansions for absolute value.
Several patches in preparation for Altivec.
Bug fix for tcg/aarch64 vs min/max.
-----BEGIN PGP SIGNATURE-----
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Merge remote-tracking branch 'remotes/rth/tags/pull-tcg-20190513' into staging
Improve code generation for vector duplication.
Add vector expansions for shifts by non-constant scalar.
Add vector expansions for shifts by vector.
Add integer and vector expansions for absolute value.
Several patches in preparation for Altivec.
Bug fix for tcg/aarch64 vs min/max.
# gpg: Signature made Tue 14 May 2019 00:58:02 BST
# gpg: using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg: issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A 05C0 64DF 38E8 AF7E 215F
* remotes/rth/tags/pull-tcg-20190513: (31 commits)
tcg/aarch64: Do not advertise minmax for MO_64
target/xtensa: Use tcg_gen_abs_i32
target/tricore: Use tcg_gen_abs_tl
target/s390x: Use tcg_gen_abs_i64
target/ppc: Use tcg_gen_abs_tl
target/ppc: Use tcg_gen_abs_i32
target/cris: Use tcg_gen_abs_tl
target/arm: Use tcg_gen_abs_i64 and tcg_gen_gvec_abs
tcg/aarch64: Support vector absolute value
tcg/i386: Support vector absolute value
tcg: Add support for vector absolute value
tcg: Add support for integer absolute value
tcg/i386: Support vector scalar shift opcodes
tcg: Add gvec expanders for vector shift by scalar
tcg/aarch64: Support vector variable shift opcodes
tcg/i386: Support vector variable shift opcodes
tcg: Add gvec expanders for variable shift
tcg: Add INDEX_op_dupm_vec
tcg/aarch64: Implement tcg_out_dupm_vec
tcg/i386: Implement tcg_out_dupm_vec
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20190423102145.14812-2-f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Remove a function of the same name from target/arm/.
Use a branchless implementation of abs gleaned from gcc.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Allow expansion either via shift by scalar or by replicating
the scalar for shift by vector.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
v3: Use a private structure for do_gvec_shifts.
The gvec expanders perform a modulo on the shift count. If the target
requires alternate behaviour, then it cannot use the generic gvec
expanders anyway, and will have to have its own custom code.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Allow the backend to expand dup from memory directly, instead of
forcing the value into a temp first. This is especially important
if integer/vector register moves do not exist.
Note that officially tcg_out_dupm_vec is allowed to fail.
If it did, we could fix this up relatively easily:
VECE == 32/64:
Load the value into a vector register, then dup.
Both of these must work.
VECE == 8/16:
If the value happens to be at an offset such that an aligned
load would place the desired value in the least significant
end of the register, go ahead and load w/garbage in high bits.
Load the value w/INDEX_op_ld{8,16}_i32.
Attempt a move directly to vector reg, which may fail.
Store the value into the backing store for OTS.
Load the value into the vector reg w/TCG_TYPE_I32, which must work.
Duplicate from the vector reg into itself, which must work.
All of which is well and good, except that all supported
hosts can support dupm for all vece, so all of the failure
paths would be dead code and untestable.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The LD1R instruction does all the work. Note that the only
useful addressing mode is a base register with no offset.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This case is similar to INDEX_op_mov_* in that we need to do
different things depending on the current location of the source.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
v3: Added some commentary to the tcg_reg_alloc_* functions.
The i386 backend already has these functions, and the aarch64 backend
could easily split out one. Nothing is done with these functions yet,
but this will aid register allocation of INDEX_op_dup_vec in a later patch.
Adjust the aarch64 tcg_out_dupi_vec signature to match the new interface.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
PowerPC Altivec does not support direct moves between vector registers
and general registers. So when tcg_out_mov fails, we can use the
backing memory for the temporary to perform the move.
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This patch merely changes the interface, aborting on all failures,
of which there are currently none.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
We have a function that takes an additional condition parameter
over the standard backend interface. It already takes care of
eliding no-op moves.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The only fixed_reg is cpu_env, and it should not be modified
during any TB. Therefore code that tries to special-case moves
into a fixed_reg is dead. Remove it.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Replace the single opcode in .opc with a null-terminated
array in .opt_opc. We still require that all opcodes be
used with the same .vece.
Validate the contents of this list with CONFIG_DEBUG_TCG.
All tcg_gen_*_vec functions will check any list active
during .fniv expansion. Swap the active list in and out
as we expand other opcodes, or take control away from the
front-end function.
Convert all existing vector aware front ends.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
PowerPC Altivec does not support add and subtract of 64-bit elements.
Prepare for that configuration by not assuming the operation is
universally supported.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Use tcg_can_emit_vec_op instead of just TCG_TARGET_HAS_neg_vec,
so that we check the type and vece for the actual operation.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Let's add tcg_gen_gvec_3i(), similar to tcg_gen_gvec_2i(), however
without introducing "gen_helper_gvec_3i *fnoi", as it isn't needed
for now.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20190416185301.25344-2-david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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Merge remote-tracking branch 'remotes/huth-gitlab/tags/pull-request-2019-05-13' into staging
Kconfig settings for the Arm machines
# gpg: Signature made Mon 13 May 2019 09:19:43 BST
# gpg: using RSA key 2ED9D774FE702DB5
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg: aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg: aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg: aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5
* remotes/huth-gitlab/tags/pull-request-2019-05-13: (29 commits)
hw/arm: Remove hard-enablement of the remaining PCI devices
hw/arm: Express dependencies of the musca machines with Kconfig
hw/arm: Express dependencies of the xlnx-versal-virt machine with Kconfig
hw/arm: Express dependencies of the ZynqMP zcu102 machine with Kconfig
hw/arm: Express dependencies of the microbit / nrf51 machine with Kconfig
hw/arm: Express dependencies of the remaining IMX boards with Kconfig
hw/arm: Express dependencies of the MSF2 / EMCRAFT_SF2 machine with Kconfig
hw/arm: Express dependencies of sabrelite with Kconfig
hw/arm: Express dependencies of canon-a1100 with Kconfig
hw/arm: Express dependencies of the raspi machines with Kconfig
hw/arm: Express dependencies of the MPS2 boards with Kconfig
hw/arm: Express dependencies of allwinner / cubieboard with Kconfig
hw/arm: Express dependencies of netduino / stm32f2xx with Kconfig
hw/arm: Express dependencies of the virt machine with Kconfig
hw/arm: Express dependencies of the aspeed boards with Kconfig
hw/arm: Express dependencies of collie with Kconfig
hw/arm: Express dependencies of xilinx-zynq with Kconfig
hw/arm: Express dependencies of the PXA2xx machines with Kconfig
hw/arm: Express dependencies of realview, versatile and vexpress with Kconfig
hw/arm: Express dependencies of stellaris with Kconfig
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
