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9dc54ddece
KVM arch-neutral and documentation changes for 7.3 - Remove kvm_debugfs_dir if kvm_init() fails after creating KVM's debugfs. - Document some of the "fun" gotchas with the APIC base when creating IRQCHIPs on x86. - Add a per-VM bitmap to track which vCPU IDs have been "claimed" but for which the vCPU isn't yet online, and use the bitmap to reject duplicate IDs before calling into arch code. This allows arch code to consume vcpu_id without having to worry about cross-vCPU clobbering (at least s390 and x86 have had related bugs). - Zero a vCPU's entry in VMX's Posted Interrupt Descriptor table used for IPI virtualization when the vCPU is freed to fix a use-after-free where hardware will write to a freed vCPU's PID.