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Correct panic caused by attaching both Xen PV and HyperV virtualization
aware drivers on Xen hypervisors that advertise support for some HyperV features. x86/xen/hvm.c: When running in HVM mode on a Xen hypervisor, set vm_guest to VM_GUEST_XEN so other virtualization aware components in the FreeBSD kernel can detect this mode is active. dev/hyperv/vmbus/hv_hv.c: Use vm_guest to ignore Xen's HyperV emulation when Xen is detected and Xen PV drivers are active. Reported by: Shanker Balan Submitted by: Roger Pau Monné Sponsored by: Citrix Systems R&D Reviewed by: gibbs Approved by: re (Xen blanket)
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