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author | Markus Armbruster <armbru@redhat.com> | 2020-06-22 11:42:21 +0200 |
---|---|---|
committer | Markus Armbruster <armbru@redhat.com> | 2020-06-23 16:07:07 +0200 |
commit | 1bc133365e39feb2a37747d47de281927ce1b853 (patch) | |
tree | 6b8550a7dd9a952084d0b2cbf3a35193080cf26f /hw/core | |
parent | 466c2983f88b75c37d8bab0d68ca1a1ae15949a1 (diff) | |
download | qemu-1bc133365e39feb2a37747d47de281927ce1b853.zip qemu-1bc133365e39feb2a37747d47de281927ce1b853.tar.gz qemu-1bc133365e39feb2a37747d47de281927ce1b853.tar.bz2 |
qdev: Improve netdev property override error a bit
qdev_prop_set_netdev() fails when the property already has a non-null
value. Seems to go back to commit 30c367ed44
"qdev-properties-system.c: Allow vlan or netdev for -device, not
both", v1.7.0. Board code doesn't expect failure, and crashes:
$ qemu-system-x86_64 --nodefaults -nic user -netdev user,id=nic0 -global e1000.netdev=nic0
Unexpected error in error_set_from_qdev_prop_error() at /work/armbru/qemu/hw/core/qdev-properties.c:1101:
qemu-system-x86_64: Property 'e1000.netdev' doesn't take value '__org.qemu.nic0
'
Aborted (core dumped)
-device and device_add handle the failure:
$ qemu-system-x86_64 -nodefaults -netdev user,id=net0 -netdev user,id=net1 -device e1000,netdev=net0,netdev=net1
qemu-system-x86_64: -device e1000,netdev=net0,netdev=net1: Property 'e1000.netdev' doesn't take value 'net1'
$ qemu-system-x86_64 -nodefaults -S -display none -monitor stdio -netdev user,id=net0 -netdev user,id=net1 -global e1000.netdev=net0
QEMU 5.0.50 monitor - type 'help' for more information
(qemu) qemu-system-x86_64: warning: netdev net0 has no peer
qemu-system-x86_64: warning: netdev net1 has no peer
device_add e1000,netdev=net1
Error: Property 'e1000.netdev' doesn't take value 'net1'
Perhaps netdev property override could be made to work. Perhaps it
should. I'm not the right guy to figure this out. What I can do is
improve the error message a bit:
(qemu) device_add e1000,netdev=net1
Error: -global e1000.netdev=... conflicts with netdev=net1
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200622094227.1271650-11-armbru@redhat.com>
Diffstat (limited to 'hw/core')
-rw-r--r-- | hw/core/qdev-properties-system.c | 30 | ||||
-rw-r--r-- | hw/core/qdev-properties.c | 17 |
2 files changed, 44 insertions, 3 deletions
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c index 9aa8049..3f84309 100644 --- a/hw/core/qdev-properties-system.c +++ b/hw/core/qdev-properties-system.c @@ -25,6 +25,28 @@ #include "sysemu/iothread.h" #include "sysemu/tpm_backend.h" +static bool check_prop_still_unset(DeviceState *dev, const char *name, + const void *old_val, const char *new_val, + Error **errp) +{ + const GlobalProperty *prop = qdev_find_global_prop(dev, name); + + if (!old_val) { + return true; + } + + if (prop) { + error_setg(errp, "-global %s.%s=... conflicts with %s=%s", + prop->driver, prop->property, name, new_val); + } else { + /* Error message is vague, but a better one would be hard */ + error_setg(errp, "%s=%s conflicts, and override is not implemented", + name, new_val); + } + return false; +} + + /* --- drive --- */ static void get_drive(Object *obj, Visitor *v, const char *name, void *opaque, @@ -299,14 +321,16 @@ static void set_netdev(Object *obj, Visitor *v, const char *name, } for (i = 0; i < queues; i++) { - if (peers[i]->peer) { err = -EEXIST; goto out; } - if (ncs[i]) { - err = -EINVAL; + /* + * TODO Should this really be an error? If no, the old value + * needs to be released before we store the new one. + */ + if (!check_prop_still_unset(dev, name, ncs[i], str, errp)) { goto out; } diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c index ead35d7..71f8aca 100644 --- a/hw/core/qdev-properties.c +++ b/hw/core/qdev-properties.c @@ -1246,6 +1246,23 @@ void qdev_prop_register_global(GlobalProperty *prop) g_ptr_array_add(global_props(), prop); } +const GlobalProperty *qdev_find_global_prop(DeviceState *dev, + const char *name) +{ + GPtrArray *props = global_props(); + const GlobalProperty *p; + int i; + + for (i = 0; i < props->len; i++) { + p = g_ptr_array_index(props, i); + if (object_dynamic_cast(OBJECT(dev), p->driver) + && !strcmp(p->property, name)) { + return p; + } + } + return NULL; +} + int qdev_prop_check_globals(void) { int i, ret = 0; |