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[Bug 1350375] Re: DomU crach on xen <3.2 due to NMI call


$ git log -S xen_enable_nmi --source --all
        commit ea9f9274bf4337ba7cbab241c780487651642d63 refs/tags/v3.16-rc6
        Author: David Vrabel <david.vrabel@xxxxxxxxxx>
        Date: Mon Jun 16 13:07:00 2014 +0200

            x86/xen: no need to explicitly register an NMI callback

            Remove xen_enable_nmi() to fix a 64-bit guest crash when registering
            the NMI callback on Xen 3.1 and earlier.

            It's not needed since the NMI callback is set by a set_trap_table
            hypercall (in xen_load_idt() or xen_write_idt_entry()).

            It's also broken since it only set the current VCPU's

            Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
            Reported-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
            Tested-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>

** Package changed: ubuntu => linux-meta (Ubuntu)

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  DomU crach on xen <3.2 due to NMI call

Status in “linux” package in Ubuntu:

Bug description:
  Request from Amazon:

  Our engineering team has reported that the kernel in 14.04 LTS is
  making a call to NMI which in turn causes DomU instances to crash
  under Xen <3.2. This affects only a particular range of kernel
  versions from 3.12.25 to 3.15.6, and the kernel in 14.04 seems to be
  3.14.x. There is already a patch in the mainstream kernel version to
  apply that would address the situation. The probability of a DomU
  crash with the current ubuntu 14.04 kernel on a Dom0 running Xen <3.2
  is always. Our customers sometimes run on instance types that route
  them to >3.2 Xen so this does not impact all customers.

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