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virtio: Drop out of coroutine context in virtio_load()

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virtio_load() as a whole should run in coroutine context because it
reads from the migration stream and we don't want this to block.

However, it calls virtio_set_features_nocheck() and devices don't
expect their .set_features callback to run in a coroutine and therefore
call functions that may not be called in coroutine context. To fix this,
drop out of coroutine context for calling virtio_set_features_nocheck().

Without this fix, the following crash was reported:

  #0  __pthread_kill_implementation (threadid=<optimized out>, signo=signo@entry=6, no_tid=no_tid@entry=0) at pthread_kill.c:44
  #1  0x00007efc738c05d3 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at pthread_kill.c:78
  #2  0x00007efc73873d26 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
  #3  0x00007efc738477f3 in __GI_abort () at abort.c:79
  #4  0x00007efc7384771b in __assert_fail_base (fmt=0x7efc739dbcb8 "", assertion=assertion@entry=0x560aebfbf5cf "!qemu_in_coroutine()",
     file=file@entry=0x560aebfcd2d4 "../block/graph-lock.c", line=line@entry=275, function=function@entry=0x560aebfcd34d "void bdrv_graph_rdlock_main_loop(void)") at assert.c:92
  #5  0x00007efc7386ccc6 in __assert_fail (assertion=0x560aebfbf5cf "!qemu_in_coroutine()", file=0x560aebfcd2d4 "../block/graph-lock.c", line=275,
     function=0x560aebfcd34d "void bdrv_graph_rdlock_main_loop(void)") at assert.c:101
  #6  0x0000560aebcd8dd6 in bdrv_register_buf ()
  #7  0x0000560aeb97ed97 in ram_block_added.llvm ()
  #8  0x0000560aebb8303f in ram_block_add.llvm ()
  #9  0x0000560aebb834fa in qemu_ram_alloc_internal.llvm ()
  #10 0x0000560aebb2ac98 in vfio_region_mmap ()
  #11 0x0000560aebb3ea0f in vfio_bars_register ()
  #12 0x0000560aebb3c628 in vfio_realize ()
  #13 0x0000560aeb90f0c2 in pci_qdev_realize ()
  #14 0x0000560aebc40305 in device_set_realized ()
  #15 0x0000560aebc48e07 in property_set_bool.llvm ()
  #16 0x0000560aebc46582 in object_property_set ()
  #17 0x0000560aebc4cd58 in object_property_set_qobject ()
  #18 0x0000560aebc46ba7 in object_property_set_bool ()
  #19 0x0000560aeb98b3ca in qdev_device_add_from_qdict ()
  #20 0x0000560aebb1fbaf in virtio_net_set_features ()
  #21 0x0000560aebb46b51 in virtio_set_features_nocheck ()
  #22 0x0000560aebb47107 in virtio_load ()
  #23 0x0000560aeb9ae7ce in vmstate_load_state ()
  #24 0x0000560aeb9d2ee9 in qemu_loadvm_state_main ()
  #25 0x0000560aeb9d45e1 in qemu_loadvm_state ()
  #26 0x0000560aeb9bc32c in process_incoming_migration_co.llvm ()
  #27 0x0000560aebeace56 in coroutine_trampoline.llvm ()

Cc: qemu-stable@nongnu.org
Buglink: https://issues.redhat.com/browse/RHEL-832
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230905145002.46391-3-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 92e2e6a867)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
(Mjt: remove coroutine_mixed_fn markings introduced in v7.2.0-909-g0f3de970fe)
This commit is contained in:
Kevin Wolf 2023-09-05 16:50:02 +02:00 committed by Michael Tokarev
parent 3c99de0aa7
commit 217ab2b86c
1 changed files with 35 additions and 2 deletions
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37
hw/virtio/virtio.c
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@ -3451,6 +3451,39 @@ static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val)
return bad ? -1 : 0;
}
typedef struct VirtioSetFeaturesNocheckData {
Coroutine *co;
VirtIODevice *vdev;
uint64_t val;
int ret;
} VirtioSetFeaturesNocheckData;
static void virtio_set_features_nocheck_bh(void *opaque)
{
VirtioSetFeaturesNocheckData *data = opaque;
data->ret = virtio_set_features_nocheck(data->vdev, data->val);
aio_co_wake(data->co);
}
static int
virtio_set_features_nocheck_maybe_co(VirtIODevice *vdev, uint64_t val)
{
if (qemu_in_coroutine()) {
VirtioSetFeaturesNocheckData data = {
.co = qemu_coroutine_self(),
.vdev = vdev,
.val = val,
};
aio_bh_schedule_oneshot(qemu_get_current_aio_context(),
virtio_set_features_nocheck_bh, &data);
qemu_coroutine_yield();
return data.ret;
} else {
return virtio_set_features_nocheck(vdev, val);
}
}
int virtio_set_features(VirtIODevice *vdev, uint64_t val)
{
int ret;
@ -3621,14 +3654,14 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
* host_features.
*/
uint64_t features64 = vdev->guest_features;
if (virtio_set_features_nocheck(vdev, features64) < 0) {
if (virtio_set_features_nocheck_maybe_co(vdev, features64) < 0) {
error_report("Features 0x%" PRIx64 " unsupported. "
"Allowed features: 0x%" PRIx64,
features64, vdev->host_features);
return -1;
}
} else {
if (virtio_set_features_nocheck(vdev, features) < 0) {
if (virtio_set_features_nocheck_maybe_co(vdev, features) < 0) {
error_report("Features 0x%x unsupported. "
"Allowed features: 0x%" PRIx64,
features, vdev->host_features);