commit 3e515705a1f46beb1c942bb8043c16f8ac7b1e9e
author Avi Kivity <avi@redhat.com> Mon Mar 05 14:23:29 2012 +0200
committer Avi Kivity <avi@redhat.com> Thu Mar 08 14:10:30 2012 +0200
tree fd0e53e5f51e6e03dda80d7aec6073f5cb694fd1
parent 4cee4798a304ee1ea579423ca048f16ceaccdfb5

KVM: Ensure all vcpus are consistent with in-kernel irqchip settings

If some vcpus are created before KVM_CREATE_IRQCHIP, then
irqchip_in_kernel() and vcpu->arch.apic will be inconsistent, leading
to potential NULL pointer dereferences.

Fix by:
- ensuring that no vcpus are installed when KVM_CREATE_IRQCHIP is called
- ensuring that a vcpu has an apic if it is installed after KVM_CREATE_IRQCHIP

This is somewhat long winded because vcpu->arch.apic is created without
kvm->lock held.

Based on earlier patch by Michael Ellerman.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Avi Kivity <avi@redhat.com>