ARM guests may induce host asynchronous abort

ISSUE DESCRIPTION

Depending on how the hardware and firmware have been integrated, guest-triggered asynchronous aborts (SError on ARMv8) may be received by the hypervisor. The current action is to crash the host.
A guest might trigger an asynchronous abort when accessing memory mapped hardware in a non-conventional way. Even if device pass-through has not been configured, the hypervisor may give the guest access to memory mapped hardware in order to take advantage of hardware virtualization.
The CVEs are as follows: xsa201-1.patch CVE-2016-9815 xsa201-2.patch CVE-2016-9816 xsa201-3-*.patch CVE-2016-9817 xsa201-4.patch CVE-2016-9818

IMPACT

A malicious guest may be able to crash the host.

VULNERABLE SYSTEMS

All Xen versions which support ARM are potentially affected.
Whether a particular ARM systems is affected depends on technical details of the hardware and/or firmware.
x86 systems are not affected.