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[Xen-bugs] [Bug 1588] New: Need method for detecting vmxassist

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Subject: [Xen-bugs] [Bug 1588] New: Need method for detecting vmxassist
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Date: Fri, 12 Mar 2010 21:13:30 -0800
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           Summary: Need method for detecting vmxassist
           Product: Xen
           Version: 3.0.3
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: hpa@xxxxxxxxx

I received a bug report from Red Hat that newer versions of Syslinux wouldn't
work on RHEL 5 Xen in HVM mode.  I root-caused this bug to vmxassist not
handling the HLT instruction in real mode (HLT causes an exit from V86 mode.)

This is reasonably easy to implement a workaround for: I can busy-wait instead
of HLT.  However, this would affect users of all virtualization platforms, not
just the affected versions of Xen.  As such, it would be highly useful if there
was a way to detect if vmxassist is (or may be) present.

Any reasonable such method?

See Red Hat bug: https://bugzilla.redhat.com/show_bug.cgi?id=570496

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