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pc: fix crash in rtc_set_memory() if initial cpu is marked as hotplugged 

'hotplugged' propperty is meant to be used on migration side when migrating
source with hotplugged devices.
However though it not exacly correct usage of 'hotplugged' property
it's possible to set generic hotplugged property for CPU using
 -cpu foo,hotplugged=on
or
 -global foo.hotplugged=on

in this case qemu crashes with following backtrace:

...

because pc_cpu_plug() assumes that hotplugged CPU could appear only after
rtc/fw_cfg are initialized.
Fix crash by replacing assumption with explicit checks of rtc/fw_cfg
and updating them only if they were initialized.

Cc: qemu-stable@nongnu.org
Reported-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1483108391-199542-1-git-send-email-imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
master
Igor Mammedov 2016-12-30 15:33:11 +01:00 committed by Paolo Bonzini
parent 9f57061c35
commit 26ef65beab
1 changed files with 3 additions and 1 deletions
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4
hw/i386/pc.c
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@ -1820,8 +1820,10 @@ static void pc_cpu_plug(HotplugHandler *hotplug_dev,
/* increment the number of CPUs */
pcms->boot_cpus++;
if (dev->hotplugged) {
if (pcms->rtc) {
rtc_set_cpus_count(pcms->rtc, pcms->boot_cpus);
}
if (pcms->fw_cfg) {
fw_cfg_modify_i16(pcms->fw_cfg, FW_CFG_NB_CPUS, pcms->boot_cpus);
}