[patch 0/4] VMX: configure posted interrupt descriptor when assigning device (v4)

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Configuration of the posted interrupt descriptor is incorrect when devices
are hotplugged to the guest (and vcpus are halted).

See patch 4 for details.

---

v4: remove NULL assignments from kvm_x86_ops (Peter Xu)
    check for return value of ->start_assignment directly (Peter Xu)

v3: improved comments (Sean)
    use kvm_vcpu_wake_up (Sean)
    drop device_count from start_assignment function (Peter Xu)

v2: rather than using a potentially racy IPI (vs vcpu->cpu switches),
    kick the vcpus when assigning a device and let the blocked per-CPU
    list manipulation happen locally at ->pre_block and ->post_block
    (Sean Christopherson).





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