`xl create` hang on skylake desktop

["Lai, Paul" <paul.c.lai@intel.com>]

Hi Shannon:

I’m reporting that commit 38cd0664a6bf1c3b887992ea029d2bb516f52c59 is causing a
hang in the `xl create windows7` command on my skylake desktop.  This is a
regression from previous behavior.

commit 38cd0664a6bf1c3b887992ea029d2bb516f52c59
Author: Shannon Zhao <shannon.zhao@linaro.org>
Date:   Wed Sep 28 18:19:02 2016 -0700

    libxl/arm: Add the size of ACPI tables to maxmem

    Here it adds the ACPI tables size to set the target maxmem to avoid
    providing less available memory for guest.

    Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
    Acked-by: Wei Liu <wei.liu2@citrix.com>

I’ve was able to chase down this patchset by bisecting between
40277cded320efa32b86c0c9f01e33145eab5ee4 and
343f84be135e6f9e681960a9e235296eae159fc8.
I’ve confirmed that reverting 38cd0664a6bf1c3b887992ea029d2bb516f52c59 cleanly
avoids the hang.

I'm wondering how best to go forward,

Regards,
-Paul

PS:
Other info that might be helpful.

My CPU is:
        processor       : 7
        vendor_id       : GenuineIntel
        cpu family      : 6
        model           : 94
        model name      : Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz

The contents of the simple windows7 config file are:
        name="windows7"
        description="None"
        uuid="5c12c654-5ef4-d447-73de-ae106605f519"
        memory=1024
        maxmem=1024
        vcpus=2
        on_poweroff="destroy"
        on_reboot="restart"
        on_crash="destroy"
        localtime=1
        keymap="en-us"

        builder="hvm"
        boot="c"
        disk=[ '/rhel-home/pclai/xen-images/p2m_test/ia32_win7_ent.img,raw,hda,w', ]
        vif=[ 'mac=00:16:3e:4b:66:5f,bridge=br0,model=rtl8139', ]



        stdvga=0
        vnc=1
        vncunused=1
        soundhw="sb16"

        viridian=0
        usb=1
        acpi=1
        pae=1

        usbdevice='tablet'

        serial="pty"

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