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ivshmem: Fix unplug of device "ivshmem-plain" 

Commit 2aece63c8a "hostmem: detect host backend memory is being used
properly" fixed "ivshmem-plain" to reject memory backends that are
already in use, and to block their deletion while in use.  Two bugs
escaped review:

* New ivshmem_plain_exit() fails to call ivshmem_exit().  This breaks
  unplug.  Reproducer: migration after unplug still fails with
  "Migration is disabled when using feature 'peer mode' in device
  'ivshmem'".

* It failed to update legacy "ivshmem".  Harmless, because it creates
  the memory backend itself, and nothing else should use it.

Fix by moving the two host_memory_backend_set_mapped() calls into
ivshmem_common_realize() and ivshmem_exit(), guarded by s->hostmem.

Fixes: 2aece63c8a
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180926163709.22876-1-armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Markus Armbruster 2018-09-26 18:37:09 +02:00
parent 70b1105930
commit b266f1d112
1 changed files with 5 additions and 9 deletions
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14
hw/misc/ivshmem.c
View File

@ -911,6 +911,7 @@ static void ivshmem_common_realize(PCIDevice *dev, Error **errp)
IVSHMEM_DPRINTF("using hostmem\n");
s->ivshmem_bar2 = host_memory_backend_get_memory(s->hostmem);
host_memory_backend_set_mapped(s->hostmem, true);
} else {
Chardev *chr = qemu_chr_fe_get_driver(&s->server_chr);
assert(chr);
@ -993,6 +994,10 @@ static void ivshmem_exit(PCIDevice *dev)
vmstate_unregister_ram(s->ivshmem_bar2, DEVICE(dev));
}
if (s->hostmem) {
host_memory_backend_set_mapped(s->hostmem, false);
}
if (s->peers) {
for (i = 0; i < s->nb_peers; i++) {
close_peer_eventfds(s, i);
@ -1101,14 +1106,6 @@ static void ivshmem_plain_realize(PCIDevice *dev, Error **errp)
}
ivshmem_common_realize(dev, errp);
host_memory_backend_set_mapped(s->hostmem, true);
}
static void ivshmem_plain_exit(PCIDevice *pci_dev)
{
IVShmemState *s = IVSHMEM_COMMON(pci_dev);
host_memory_backend_set_mapped(s->hostmem, false);
}
static void ivshmem_plain_class_init(ObjectClass *klass, void *data)
@ -1117,7 +1114,6 @@ static void ivshmem_plain_class_init(ObjectClass *klass, void *data)
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
k->realize = ivshmem_plain_realize;
k->exit = ivshmem_plain_exit;
dc->props = ivshmem_plain_properties;
dc->vmsd = &ivshmem_plain_vmsd;
}