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kvmclock: Don't crash QEMU if KVM is disabled 

Most machines don't allow sysbus devices like "kvmclock" to be
created from the command-line, but some of them do (the ones with
has_dynamic_sysbus=true). In those cases, it's possible to
manually create a kvmclock device without KVM being enabled,
making QEMU crash:

  $ qemu-system-x86_64 -machine q35,accel=tcg -device kvmclock
  Segmentation fault (core dumped)

This changes kvmclock's realize method to return an error if KVM
is disabled, to ensure it won't crash QEMU.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20170309185046.17555-1-ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Eduardo Habkost 2017-03-09 15:50:46 -03:00 committed by Paolo Bonzini
parent c70b11d160
commit ca2edcd35c
1 changed files with 6 additions and 0 deletions
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6
hw/i386/kvm/clock.c
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@ -22,6 +22,7 @@
#include "kvm_i386.h"
#include "hw/sysbus.h"
#include "hw/kvm/clock.h"
#include "qapi/error.h"
#include <linux/kvm.h>
#include <linux/kvm_para.h>
@ -208,6 +209,11 @@ static void kvmclock_realize(DeviceState *dev, Error **errp)
{
KVMClockState *s = KVM_CLOCK(dev);
if (!kvm_enabled()) {
error_setg(errp, "kvmclock device requires KVM");
return;
}
kvm_update_clock(s);
qemu_add_vm_change_state_handler(kvmclock_vm_state_change, s);