path: root/virt
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authorJan Kiszka <jan.kiszka@siemens.com>2011-12-14 19:25:13 +0100
committerAvi Kivity <avi@redhat.com>2011-12-25 17:13:18 +0200
commit0924ab2cfa98b1ece26c033d696651fd62896c69 (patch)
tree87b23ddd025d5c44ebaa941b92c8cd8ade6af703 /virt
parent4962516b2309d76964f9df0d33e74f43b624a42d (diff)
KVM: x86: Prevent starting PIT timers in the absence of irqchip support
User space may create the PIT and forgets about setting up the irqchips. In that case, firing PIT IRQs will crash the host: BUG: unable to handle kernel NULL pointer dereference at 0000000000000128 IP: [<ffffffffa10f6280>] kvm_set_irq+0x30/0x170 [kvm] ... Call Trace: [<ffffffffa11228c1>] pit_do_work+0x51/0xd0 [kvm] [<ffffffff81071431>] process_one_work+0x111/0x4d0 [<ffffffff81071bb2>] worker_thread+0x152/0x340 [<ffffffff81075c8e>] kthread+0x7e/0x90 [<ffffffff815a4474>] kernel_thread_helper+0x4/0x10 Prevent this by checking the irqchip mode before starting a timer. We can't deny creating the PIT if the irqchips aren't set up yet as current user land expects this order to work. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'virt')
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