Commit Graph

107004 Commits

Author SHA1 Message Date
Philippe Mathieu-Daudé
09e24b10de hw/nios2: Clean up local variable shadowing
Fix:

  hw/nios2/10m50_devboard.c: In function ‘nios2_10m50_ghrd_init’:
  hw/nios2/10m50_devboard.c:101:22: warning: declaration of ‘dev’ shadows a previous local [-Wshadow=compatible-local]
    101 |         DeviceState *dev = qdev_new(TYPE_NIOS2_VIC);
        |                      ^~~
  hw/nios2/10m50_devboard.c:60:18: note: shadowed declaration is here
     60 |     DeviceState *dev;
        |                  ^~~

  hw/nios2/10m50_devboard.c:110:18: warning: declaration of ‘i’ shadows a previous local [-Wshadow=compatible-local]
    110 |         for (int i = 0; i < 32; i++) {
        |                  ^
  hw/nios2/10m50_devboard.c:67:9: note: shadowed declaration is here
     67 |     int i;
        |         ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-15-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:16 +02:00
Philippe Mathieu-Daudé
4705c8e5a2 hw/microblaze: Clean up local variable shadowing
Fix:

  hw/microblaze/petalogix_ml605_mmu.c: In function ‘petalogix_ml605_init’:
  hw/microblaze/petalogix_ml605_mmu.c:186:24: warning: declaration of ‘dinfo’ shadows a previous local [-Wshadow=compatible-local]
    186 |             DriveInfo *dinfo = drive_get(IF_MTD, 0, i);
        |                        ^~~~~
  hw/microblaze/petalogix_ml605_mmu.c:78:16: note: shadowed declaration is here
     78 |     DriveInfo *dinfo;
        |                ^~~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-14-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:16 +02:00
Philippe Mathieu-Daudé
5f87dddbc2 hw/m68k: Clean up local variable shadowing
Fix:

  hw/m68k/virt.c:263:13: error: declaration shadows a local variable [-Werror,-Wshadow]
            BOOTINFOSTR(param_ptr, BI_COMMAND_LINE,
            ^
  hw/m68k/bootinfo.h:47:13: note: expanded from macro 'BOOTINFOSTR'
        int i; \
            ^
  hw/m68k/virt.c:130:9: note: previous declaration is here
    int i;
        ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-13-philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
2f6037a235 hw/arm/allwinner: Clean up local variable shadowing
Fix:

  hw/arm/allwinner-r40.c:412:14: error: declaration shadows a local variable [-Werror,-Wshadow]
    for (int i = 0; i < AW_R40_NUM_MMCS; i++) {
             ^
  hw/arm/allwinner-r40.c:299:14: note: previous declaration is here
    unsigned i;
             ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20230904161235.84651-10-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
c7f14e4898 hw/arm/virt: Clean up local variable shadowing
Fix:

  hw/arm/virt.c:821:22: error: declaration shadows a local variable [-Werror,-Wshadow]
            qemu_irq irq = qdev_get_gpio_in(vms->gic,
                     ^
  hw/arm/virt.c:803:13: note: previous declaration is here
        int irq;
            ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20230904161235.84651-9-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
807e4d1d21 hw/arm/armv7m: Clean up local variable shadowing
Fix:

  hw/arm/armv7m.c: In function ‘armv7m_realize’:
  hw/arm/armv7m.c:520:27: warning: declaration of ‘sbd’ shadows a previous local [-Wshadow=compatible-local]
    520 |             SysBusDevice *sbd = SYS_BUS_DEVICE(&s->bitband[i]);
        |                           ^~~
  hw/arm/armv7m.c:278:19: note: shadowed declaration is here
    278 |     SysBusDevice *sbd;
        |                   ^~~
       ---

  hw/arm/armsse.c: In function ‘armsse_realize’:
  hw/arm/armsse.c:1471:27: warning: declaration of ‘mr’ shadows a previous local [-Wshadow=compatible-local]
   1471 |             MemoryRegion *mr;
        |                           ^~
  hw/arm/armsse.c:917:19: note: shadowed declaration is here
    917 |     MemoryRegion *mr;
        |                   ^~
       ---

  hw/arm/armsse.c:1608:22: warning: declaration of ‘dev_splitter’ shadows a previous local [-Wshadow=compatible-local]
   1608 |         DeviceState *dev_splitter = DEVICE(splitter);
        |                      ^~~~~~~~~~~~
  hw/arm/armsse.c:923:18: note: shadowed declaration is here
    923 |     DeviceState *dev_splitter;
        |                  ^~~~~~~~~~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-8-philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
81b8056a41 target/tricore: Clean up local variable shadowing
Fix:

  target/tricore/translate.c:5016:18: warning: declaration of ‘temp’ shadows a previous local [-Wshadow=compatible-local]
   5016 |             TCGv temp = tcg_constant_i32(const9);
        |                  ^~~~
  target/tricore/translate.c:4958:10: note: shadowed declaration is here
   4958 |     TCGv temp;
        |          ^~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-7-philmd@linaro.org>
Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
574d572545 target/m68k: Clean up local variable shadowing
Fix:

  target/m68k/translate.c:828:18: error: declaration shadows a local variable [-Werror,-Wshadow]
            TCGv tmp = tcg_temp_new();
                 ^
  target/m68k/translate.c:801:15: note: previous declaration is here
    TCGv reg, tmp, result;
              ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20230904161235.84651-6-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
92e0ef7d90 target/mips: Clean up local variable shadowing
Fix:

  target/mips/tcg/nanomips_translate.c.inc:4410:33: error: declaration shadows a local variable [-Werror,-Wshadow]
                        int32_t imm = extract32(ctx->opcode, 1, 13) |
                                ^
  target/mips/tcg/nanomips_translate.c.inc:3577:9: note: previous declaration is here
    int imm;
        ^
  target/mips/tcg/translate.c:15578:19: error: declaration shadows a local variable [-Werror,-Wshadow]
    for (unsigned i = 1; i < 32; i++) {
                  ^
  target/mips/tcg/translate.c:15567:9: note: previous declaration is here
    int i;
        ^
  target/mips/tcg/msa_helper.c:7478:13: error: declaration shadows a local variable [-Werror,-Wshadow]
            MSA_FLOAT_MAXOP(pwx->w[0], min, pws->w[0], pws->w[0], 32);
            ^
  target/mips/tcg/msa_helper.c:7434:23: note: expanded from macro 'MSA_FLOAT_MAXOP'
        float_status *status = &env->active_tc.msa_fp_status;
                      ^

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-5-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:15 +02:00
Philippe Mathieu-Daudé
5a3d2c3562 target/arm/hvf: Clean up local variable shadowing
Per Peter Maydell analysis [*]:

  The hvf_vcpu_exec() function is not documented, but in practice
  its caller expects it to return either EXCP_DEBUG (for "this was
  a guest debug exception you need to deal with") or something else
  (presumably the intention being 0 for OK).

  The hvf_sysreg_read() and hvf_sysreg_write() functions are also not
  documented, but they return 0 on success, or 1 for a completely
  unrecognized sysreg where we've raised the UNDEF exception (but
  not if we raised an UNDEF exception for an unrecognized GIC sysreg --
  I think this is a bug). We use this return value to decide whether
  we need to advance the PC past the insn or not. It's not the same
  as the return value we want to return from hvf_vcpu_exec().

  Retain the variable as locally scoped but give it a name that
  doesn't clash with the other function-scoped variable.

This fixes:

  target/arm/hvf/hvf.c:1936:13: error: declaration shadows a local variable [-Werror,-Wshadow]
        int ret = 0;
            ^
  target/arm/hvf/hvf.c:1807:9: note: previous declaration is here
    int ret;
        ^
[*] https://lore.kernel.org/qemu-devel/CAFEAcA_e+fU6JKtS+W63wr9cCJ6btu_hT_ydZWOwC0kBkDYYYQ@mail.gmail.com/

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-4-philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:14 +02:00
Philippe Mathieu-Daudé
d54deb2a07 target/arm/tcg: Clean up local variable shadowing
Fix:

  target/arm/tcg/translate-m-nocp.c: In function ‘gen_M_fp_sysreg_read’:
  target/arm/tcg/translate-m-nocp.c:509:18: warning: declaration of ‘tmp’ shadows a previous local [-Wshadow=compatible-local]
    509 |         TCGv_i32 tmp = load_cpu_field(v7m.fpdscr[M_REG_NS]);
        |                  ^~~
  target/arm/tcg/translate-m-nocp.c:433:14: note: shadowed declaration is here
    433 |     TCGv_i32 tmp;
        |              ^~~
       ---

  target/arm/tcg/mve_helper.c: In function ‘helper_mve_vqshlsb’:
  target/arm/tcg/mve_helper.c:1259:19: warning: declaration of ‘r’ shadows a previous local [-Wshadow=compatible-local]
   1259 |         typeof(N) r = FN(N, (int8_t)(M), sizeof(N) * 8, ROUND, &su32);  \
        |                   ^
  target/arm/tcg/mve_helper.c:1267:5: note: in expansion of macro ‘WRAP_QRSHL_HELPER’
   1267 |     WRAP_QRSHL_HELPER(do_sqrshl_bhs, N, M, false, satp)
        |     ^~~~~~~~~~~~~~~~~
  target/arm/tcg/mve_helper.c:927:22: note: in expansion of macro ‘DO_SQSHL_OP’
    927 |             TYPE r = FN(n[H##ESIZE(e)], m[H##ESIZE(e)], &sat);          \
        |                      ^~
  target/arm/tcg/mve_helper.c:945:5: note: in expansion of macro ‘DO_2OP_SAT’
    945 |     DO_2OP_SAT(OP##b, 1, int8_t, FN)            \
        |     ^~~~~~~~~~
  target/arm/tcg/mve_helper.c:1277:1: note: in expansion of macro ‘DO_2OP_SAT_S’
   1277 | DO_2OP_SAT_S(vqshls, DO_SQSHL_OP)
        | ^~~~~~~~~~~~
       ---

  target/arm/tcg/mve_helper.c: In function ‘do_sqrshl48_d’:
  target/arm/tcg/mve_helper.c:2463:17: warning: declaration of ‘extval’ shadows a previous local [-Wshadow=compatible-local]
   2463 |         int64_t extval = sextract64(src << shift, 0, 48);
        |                 ^~~~~~
  target/arm/tcg/mve_helper.c:2443:18: note: shadowed declaration is here
   2443 |     int64_t val, extval;
        |                  ^~~~~~
       ---

  target/arm/tcg/mve_helper.c: In function ‘do_uqrshl48_d’:
  target/arm/tcg/mve_helper.c:2495:18: warning: declaration of ‘extval’ shadows a previous local [-Wshadow=compatible-local]
   2495 |         uint64_t extval = extract64(src << shift, 0, 48);
        |                  ^~~~~~
  target/arm/tcg/mve_helper.c:2479:19: note: shadowed declaration is here
   2479 |     uint64_t val, extval;
        |                   ^~~~~~

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-3-philmd@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:14 +02:00
Philippe Mathieu-Daudé
9a239c6eae tcg: Clean up local variable shadowing
Fix:

  tcg/tcg.c:2551:27: error: declaration shadows a local variable [-Werror,-Wshadow]
                    MemOp op = get_memop(oi);
                          ^
  tcg/tcg.c:2437:12: note: previous declaration is here
    TCGOp *op;
           ^
  accel/tcg/tb-maint.c:245:18: error: declaration shadows a local variable [-Werror,-Wshadow]
        for (int i = 0; i < V_L2_SIZE; i++) {
                 ^
  accel/tcg/tb-maint.c:210:9: note: previous declaration is here
    int i;
        ^

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20230904161235.84651-2-philmd@linaro.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
2023-09-29 10:07:14 +02:00
Markus Armbruster
bb71846325 qobject atomics osdep: Make a few macros more hygienic
Variables declared in macros can shadow other variables.  Much of the
time, this is harmless, e.g.:

    #define _FDT(exp)                                                  \
        do {                                                           \
            int ret = (exp);                                           \
            if (ret < 0) {                                             \
                error_report("error creating device tree: %s: %s",   \
                        #exp, fdt_strerror(ret));                      \
                exit(1);                                               \
            }                                                          \
        } while (0)

Harmless shadowing in h_client_architecture_support():

        target_ulong ret;

        [...]

        ret = do_client_architecture_support(cpu, spapr, vec, fdt_bufsize);
        if (ret == H_SUCCESS) {
            _FDT((fdt_pack(spapr->fdt_blob)));
            [...]
        }

        return ret;

However, we can get in trouble when the shadowed variable is used in a
macro argument:

    #define QOBJECT(obj) ({                                 \
        typeof(obj) o = (obj);                              \
        o ? container_of(&(o)->base, QObject, base) : NULL; \
     })

QOBJECT(o) expands into

    ({
--->    typeof(o) o = (o);
        o ? container_of(&(o)->base, QObject, base) : NULL;
    })

Unintended variable name capture at --->.  We'd be saved by
-Winit-self.  But I could certainly construct more elaborate death
traps that don't trigger it.

To reduce the risk of trapping ourselves, we use variable names in
macros that no sane person would use elsewhere.  Here's our actual
definition of QOBJECT():

    #define QOBJECT(obj) ({                                         \
        typeof(obj) _obj = (obj);                                   \
        _obj ? container_of(&(_obj)->base, QObject, base) : NULL;   \
    })

Works well enough until we nest macro calls.  For instance, with

    #define qobject_ref(obj) ({                     \
        typeof(obj) _obj = (obj);                   \
        qobject_ref_impl(QOBJECT(_obj));            \
        _obj;                                       \
    })

the expression qobject_ref(obj) expands into

    ({
        typeof(obj) _obj = (obj);
        qobject_ref_impl(
            ({
--->            typeof(_obj) _obj = (_obj);
                _obj ? container_of(&(_obj)->base, QObject, base) : NULL;
            }));
        _obj;
    })

Unintended variable name capture at --->.

The only reliable way to prevent unintended variable name capture is
-Wshadow.

One blocker for enabling it is shadowing hiding in function-like
macros like

     qdict_put(dict, "name", qobject_ref(...))

qdict_put() wraps its last argument in QOBJECT(), and the last
argument here contains another QOBJECT().

Use dark preprocessor sorcery to make the macros that give us this
problem use different variable names on every call.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-ID: <20230921121312.1301864-8-armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2023-09-29 08:13:57 +02:00
Markus Armbruster
fb2575f954 block: Clean up local variable shadowing
Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Tracked down with -Wshadow=local.
Clean up: delete inner declarations when they are actually redundant,
else rename variables.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230921121312.1301864-7-armbru@redhat.com>
2023-09-29 08:13:57 +02:00
Markus Armbruster
d25b99c72b block/vdi: Clean up local variable shadowing
Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Tracked down with -Wshadow=local.
Clean up: delete inner declarations when they are actually redundant,
else rename variables.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230921121312.1301864-6-armbru@redhat.com>
2023-09-29 08:13:57 +02:00
Markus Armbruster
6a0f7ff7dd block/dirty-bitmap: Clean up local variable shadowing
Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Tracked down with -Wshadow=local.
Clean up: rename both the pair of parameters and the pair of local
variables.  While there, move the local variables to function scope.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230921121312.1301864-5-armbru@redhat.com>
2023-09-29 08:13:57 +02:00
Markus Armbruster
e33e66b1b3 ui: Clean up local variable shadowing
Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Tracked down with -Wshadow=local.
Clean up: delete inner declarations when they are actually redundant,
else rename variables.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-ID: <20230921121312.1301864-4-armbru@redhat.com>
2023-09-29 08:13:57 +02:00
Markus Armbruster
7f3de3f02f migration: Clean up local variable shadowing
Local variables shadowing other local variables or parameters make the
code needlessly hard to understand.  Tracked down with -Wshadow=local.
Clean up: delete inner declarations when they are actually redundant,
else rename variables.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Message-ID: <20230921121312.1301864-3-armbru@redhat.com>
2023-09-29 08:13:57 +02:00
Markus Armbruster
bbde656263 migration/rdma: Fix save_page method to fail on polling error
qemu_rdma_save_page() reports polling error with error_report(), then
succeeds anyway.  This is because the variable holding the polling
status *shadows* the variable the function returns.  The latter
remains zero.

Broken since day one, and duplicated more recently.

Fixes: 2da776db48 (rdma: core logic)
Fixes: b390afd8c5 (migration/rdma: Fix out of order wrid)
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Message-ID: <20230921121312.1301864-2-armbru@redhat.com>
2023-09-29 08:13:57 +02:00
Fabiano Rosas
36e9aab3c5 migration: Move return path cleanup to main migration thread
Now that the return path thread is allowed to finish during a paused
migration, we can move the cleanup of the QEMUFiles to the main
migration thread.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-9-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Fabiano Rosas
ef796ee93b migration: Replace the return path retry logic
Replace the return path retry logic with finishing and restarting the
thread. This fixes a race when resuming the migration that leads to a
segfault.

Currently when doing postcopy we consider that an IO error on the
return path file could be due to a network intermittency. We then keep
the thread alive but have it do cleanup of the 'from_dst_file' and
wait on the 'postcopy_pause_rp' semaphore. When the user issues a
migrate resume, a new return path is opened and the thread is allowed
to continue.

There's a race condition in the above mechanism. It is possible for
the new return path file to be setup *before* the cleanup code in the
return path thread has had a chance to run, leading to the *new* file
being closed and the pointer set to NULL. When the thread is released
after the resume, it tries to dereference 'from_dst_file' and crashes:

Thread 7 "return path" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd1dbf700 (LWP 9611)]
0x00005555560e4893 in qemu_file_get_error_obj (f=0x0, errp=0x0) at ../migration/qemu-file.c:154
154         return f->last_error;

(gdb) bt
 #0  0x00005555560e4893 in qemu_file_get_error_obj (f=0x0, errp=0x0) at ../migration/qemu-file.c:154
 #1  0x00005555560e4983 in qemu_file_get_error (f=0x0) at ../migration/qemu-file.c:206
 #2  0x0000555555b9a1df in source_return_path_thread (opaque=0x555556e06000) at ../migration/migration.c:1876
 #3  0x000055555602e14f in qemu_thread_start (args=0x55555782e780) at ../util/qemu-thread-posix.c:541
 #4  0x00007ffff38d76ea in start_thread (arg=0x7fffd1dbf700) at pthread_create.c:477
 #5  0x00007ffff35efa6f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Here's the race (important bit is open_return_path happening before
migration_release_dst_files):

migration                 | qmp                         | return path
--------------------------+-----------------------------+---------------------------------
			    qmp_migrate_pause()
			     shutdown(ms->to_dst_file)
			      f->last_error = -EIO
migrate_detect_error()
 postcopy_pause()
  set_state(PAUSED)
  wait(postcopy_pause_sem)
			    qmp_migrate(resume)
			    migrate_fd_connect()
			     resume = state == PAUSED
			     open_return_path <-- TOO SOON!
			     set_state(RECOVER)
			     post(postcopy_pause_sem)
							(incoming closes to_src_file)
							res = qemu_file_get_error(rp)
							migration_release_dst_files()
							ms->rp_state.from_dst_file = NULL
  post(postcopy_pause_rp_sem)
							postcopy_pause_return_path_thread()
							  wait(postcopy_pause_rp_sem)
							rp = ms->rp_state.from_dst_file
							goto retry
							qemu_file_get_error(rp)
							SIGSEGV
-------------------------------------------------------------------------------------------

We can keep the retry logic without having the thread alive and
waiting. The only piece of data used by it is the 'from_dst_file' and
it is only allowed to proceed after a migrate resume is issued and the
semaphore released at migrate_fd_connect().

Move the retry logic to outside the thread by waiting for the thread
to finish before pausing the migration.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-8-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Fabiano Rosas
d50f5dc075 migration: Consolidate return path closing code
We'll start calling the await_return_path_close_on_source() function
from other parts of the code, so move all of the related checks and
tracepoints into it.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-7-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Fabiano Rosas
b3b101157d migration: Remove redundant cleanup of postcopy_qemufile_src
This file is owned by the return path thread which is already doing
cleanup.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-6-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Fabiano Rosas
7478fb0df9 migration: Fix possible race when shutting down to_dst_file
It's not safe to call qemu_file_shutdown() on the to_dst_file without
first checking for the file's presence under the lock. The cleanup of
this file happens at postcopy_pause() and migrate_fd_cleanup() which
are not necessarily running in the same thread as migrate_fd_cancel().

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-5-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Fabiano Rosas
639decf529 migration: Fix possible races when shutting down the return path
We cannot call qemu_file_shutdown() on the return path file without
taking the file lock. The return path thread could be running it's
cleanup code and have just cleared the from_dst_file pointer.

Checking ms->to_dst_file for errors could also race with
migrate_fd_cleanup() which clears the to_dst_file pointer.

Protect both accesses by taking the file lock.

This was caught by inspection, it should be rare, but the next patches
will start calling this code from other places, so let's do the
correct thing.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-4-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Fabiano Rosas
28a8347281 migration: Fix possible race when setting rp_state.error
We don't need to set the rp_state.error right after a shutdown because
qemu_file_shutdown() always sets the QEMUFile error, so the return
path thread would have seen it and set the rp error itself.

Setting the error outside of the thread is also racy because the
thread could clear it after we set it.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-3-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Peter Xu
cf02f29e1e migration: Fix race that dest preempt thread close too early
We hit intermit CI issue on failing at migration-test over the unit test
preempt/plain:

qemu-system-x86_64: Unable to read from socket: Connection reset by peer
Memory content inconsistency at 5b43000 first_byte = bd last_byte = bc current = 4f hit_edge = 1
**
ERROR:../tests/qtest/migration-test.c:300:check_guests_ram: assertion failed: (bad == 0)
(test program exited with status code -6)

Fabiano debugged into it and found that the preempt thread can quit even
without receiving all the pages, which can cause guest not receiving all
the pages and corrupt the guest memory.

To make sure preempt thread finished receiving all the pages, we can rely
on the page_requested_count being zero because preempt channel will only
receive requested page faults. Note, not all the faulted pages are required
to be sent via the preempt channel/thread; imagine the case when a
requested page is just queued into the background main channel for
migration, the src qemu will just still send it via the background channel.

Here instead of spinning over reading the count, we add a condvar so the
main thread can wait on it if that unusual case happened, without burning
the cpu for no good reason, even if the duration is short; so even if we
spin in this rare case is probably fine.  It's just better to not do so.

The condvar is only used when that special case is triggered.  Some memory
ordering trick is needed to guarantee it from happening (against the
preempt thread status field), so the main thread will always get a kick
when that triggers correctly.

Closes: https://gitlab.com/qemu-project/qemu/-/issues/1886
Debugged-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20230918172822.19052-2-farosas@suse.de>
2023-09-27 13:58:02 -04:00
Stefan Hajnoczi
5dfd80e38b * new round of audio cleanups
* various shadowed local variable fixes in vl, mptsas, pm_smbus, target/i386
 * remove deprecated pc-i440fx-1.4 up to pc-i440fx-1.7
 * remove PCI drivers from 128K bios.bin
 * remove unused variable in user-exec-stub.c
 * small fixes for ui/vnc
 * scsi-disk: Disallow block sizes smaller than 512 [CVE-2023-42467]
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Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* new round of audio cleanups
* various shadowed local variable fixes in vl, mptsas, pm_smbus, target/i386
* remove deprecated pc-i440fx-1.4 up to pc-i440fx-1.7
* remove PCI drivers from 128K bios.bin
* remove unused variable in user-exec-stub.c
* small fixes for ui/vnc
* scsi-disk: Disallow block sizes smaller than 512 [CVE-2023-42467]

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# gpg: Signature made Tue 26 Sep 2023 12:58:18 EDT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# 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

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  audio: remove shadowed locals
  compiler: introduce QEMU_ANNOTATE
  block: mark mixed functions that can suspend
  target/i386/svm_helper: eliminate duplicate local variable
  target/i386/seg_helper: remove shadowed variable
  target/i386/seg_helper: introduce tss_set_busy
  target/i386/translate: avoid shadowed local variables
  target/i386/cpu: avoid shadowed local variables
  target/i386/kvm: eliminate shadowed local variables
  m48t59-test: avoid possible overflow on ABS
  pm_smbus: rename variable to avoid shadowing
  mptsas: avoid shadowed local variables
  ui/vnc: fix handling of VNC_FEATURE_XVP
  ui/vnc: fix debug output for invalid audio message
  vl: remove shadowed local variables
  hw/scsi/scsi-disk: Disallow block sizes smaller than 512 [CVE-2023-42467]
  user-exec-stub: remove unused variable
  seabios: remove PCI drivers from bios.bin
  pc_piix: remove pc-i440fx-1.4 up to pc-i440fx-1.7

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2023-09-27 13:55:18 -04:00
Paolo Bonzini
417f8c8ebf audio: remove shadowed locals
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 18:09:08 +02:00
Paolo Bonzini
d79b9202e4 compiler: introduce QEMU_ANNOTATE
Allow a more shorter syntax when defining wrapper macros for
__attribute__((annotate(...))).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 18:09:08 +02:00
Paolo Bonzini
e2dbca0337 block: mark mixed functions that can suspend
The marking should be extended transitively to all functions that call
these ones, so that static analysis can be done much more efficiently.
However, this is a start and makes it possible to use vrc's path-based
searches to find potential bugs where coroutine_fns call blocking functions.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 18:09:08 +02:00
Paolo Bonzini
1bce34aaa9 target/i386/svm_helper: eliminate duplicate local variable
This shadows an outer "cs" variable that is initialized to the
same expression.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:41:49 +02:00
Paolo Bonzini
49958057a2 target/i386/seg_helper: remove shadowed variable
Return the width of the new task directly from switch_tss_ra.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:41:49 +02:00
Paolo Bonzini
a908985971 target/i386/seg_helper: introduce tss_set_busy
Eliminate a shadowed local variable in the process.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:41:49 +02:00
Paolo Bonzini
19729affe1 target/i386/translate: avoid shadowed local variables
Just remove the declaration.  There is nothing in the function after the
switch statement, so it is safe to do.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:41:49 +02:00
Paolo Bonzini
637123a213 target/i386/cpu: avoid shadowed local variables
Reuse the pointer variable used for the unversioned model.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:41:49 +02:00
Paolo Bonzini
e0c3ef715b target/i386/kvm: eliminate shadowed local variables
These are harmless are they die immediately after their use.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:41:49 +02:00
Paolo Bonzini
168d46749d m48t59-test: avoid possible overflow on ABS
Originally meant to avoid a shadowed variable "s", which was fixed by
renaming the outer declaration to "qts".  Avoid the chance of an overflow
in the computation of ABS(t - s).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:39:29 +02:00
Paolo Bonzini
973d3ea5a1 pm_smbus: rename variable to avoid shadowing
Acked-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-26 16:39:20 +02:00
Stefan Hajnoczi
11a629d246 NBD patches through 2023-09-25
- Denis V. Lunev: iotest improvements
 - Eric Blake: further work towards 64-bit NBD extensions
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Merge tag 'pull-nbd-2023-09-25' of https://repo.or.cz/qemu/ericb into staging

NBD patches through 2023-09-25

- Denis V. Lunev: iotest improvements
- Eric Blake: further work towards 64-bit NBD extensions

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* tag 'pull-nbd-2023-09-25' of https://repo.or.cz/qemu/ericb:
  nbd/server: Refactor handling of command sanity checks
  nbd: Prepare for 64-bit request effect lengths
  nbd: Add types for extended headers
  nbd/client: Pass mode through to nbd_send_request
  nbd: Replace bool structured_reply with mode enum
  iotests: improve 'not run' message for nbd-multiconn test
  iotests: use TEST_IMG_FILE instead of TEST_IMG in _require_large_file

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2023-09-26 09:04:23 -04:00
Paolo Bonzini
4c186847ee mptsas: avoid shadowed local variables
Rename the argument so that "addr" is only used inside the for loop.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Paolo Bonzini
477b301000 ui/vnc: fix handling of VNC_FEATURE_XVP
VNC_FEATURE_XVP was not shifted left before adding it to vs->features,
so it was never enabled; but it was also checked the wrong way with
a logical AND instead of vnc_has_feature.  Fix both places.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Paolo Bonzini
0cb9c5880e ui/vnc: fix debug output for invalid audio message
The debug message was cut and pasted from the invalid audio format
case, but the audio message is at bytes 2-3.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Paolo Bonzini
c431ffd471 vl: remove shadowed local variables
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Thomas Huth
7cfcc79b0a hw/scsi/scsi-disk: Disallow block sizes smaller than 512 [CVE-2023-42467]
We are doing things like

    nb_sectors /= (s->qdev.blocksize / BDRV_SECTOR_SIZE);

in the code here (e.g. in scsi_disk_emulate_mode_sense()), so if
the blocksize is smaller than BDRV_SECTOR_SIZE (=512), this crashes
with a division by 0 exception. Thus disallow block sizes of 256
bytes to avoid this situation.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1813
CVE: 2023-42467
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20230925091854.49198-1-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Paolo Bonzini
8a9fc82bac user-exec-stub: remove unused variable
enable_cpu_pm is only used by softmmu-specific code, namely target/i386/host-cpu.c
and target/i386/kvm/*.  It does not need a stub definition anymore.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Paolo Bonzini
a1fadbcf48 seabios: remove PCI drivers from bios.bin
bios.bin is now used only by ISA PC, so PCI drivers are not necessary.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:03 +02:00
Paolo Bonzini
ea985d235b pc_piix: remove pc-i440fx-1.4 up to pc-i440fx-1.7
These are the last users of the 128K SeaBIOS blob in the i440FX family.
Removing them allows us to drop PCI support from the 128K blob,
thus making it easier to update SeaBIOS to newer versions.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2023-09-25 18:25:02 +02:00
Stefan Hajnoczi
494a6a2cf7 * Make keyutils independent from keyring in meson.build
* Simplify the NIC init code of the jazz machine a little bit
 * Minor qtest and avocado fixes
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Merge tag 'pull-request-2023-09-25' of https://gitlab.com/thuth/qemu into staging

* Make keyutils independent from keyring in meson.build
* Simplify the NIC init code of the jazz machine a little bit
* Minor qtest and avocado fixes

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# 4rSalTn5Xuw=
# =FioB
# -----END PGP SIGNATURE-----
# gpg: Signature made Mon 25 Sep 2023 04:58:48 EDT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# 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

* tag 'pull-request-2023-09-25' of https://gitlab.com/thuth/qemu:
  tests/avocado: fix waiting for vm shutdown in replay_linux
  hw/mips/jazz: Simplify the NIC setup code
  hw/mips/jazz: Move the NIC init code into a separate function
  tests/qtest/netdev-socket: Do not test multicast on Darwin
  tests/qtest/m48t59-test: Silence compiler warning with -Wshadow
  tests/qtest/netdev-socket: Raise connection timeout to 120 seconds
  meson.build: Make keyutils independent from keyring

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2023-09-25 10:10:30 -04:00
Stefan Hajnoczi
29578f5757 * add host ticks function for RISC-V
* target/i386: Export GDS_NO bit
 * target/i386: add support for bit 56 of MSR_IA32_VMX_BASIC
 * first part of audiodev cleanups
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Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* add host ticks function for RISC-V
* target/i386: Export GDS_NO bit
* target/i386: add support for bit 56 of MSR_IA32_VMX_BASIC
* first part of audiodev cleanups

# -----BEGIN PGP SIGNATURE-----
#
# iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmUNtYUUHHBib256aW5p
# QHJlZGhhdC5jb20ACgkQv/vSX3jHroN7Uwf9Fy4aE1PHzSNr2FqT4rUSYrT4N8cL
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# =CuIa
# -----END PGP SIGNATURE-----
# gpg: Signature made Fri 22 Sep 2023 11:40:53 EDT
# gpg:                using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg:                issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# 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

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  vl: recognize audiodev groups in configuration files
  tests/qtest: Specify audiodev= and -audiodev
  hw/display/xlnx_dp.c: Add audiodev property
  hw/audio/lm4549: Add errp error reporting to init function
  hw/audio: Simplify hda audio init
  hw/input/tsc210x: Extract common init code into new function
  qemu/timer: Add host ticks function for RISC-V
  target/i386: Export GDS_NO bit to guests
  target/i386: enumerate bit 56 of MSR_IA32_VMX_BASIC

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2023-09-25 10:09:38 -04:00