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[Xen-devel] NMI Race

from [Peter Teoh] [Permanent Link][Original]
To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] NMI Race
From: "Peter Teoh" <tthtlc@xxxxxxxxxxxxxx>
Date: Thu, 2 Aug 2007 22:16:53 +0800
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I saw the following in xen\arch\x86\domain.c:
 
    /*
     * Map Xen segments into every VCPU's GDT, irrespective of whether every
     * VCPU will actually be used. This avoids an NMI race during context
     * switch: if we take an interrupt after switching CR3 but before switching
     * GDT, and the old VCPU# is invalid in the new domain, we would otherwise
     * try to load CS from an invalid table.
     */
Can someone please elaborate on this "NMI race"?  Ie, Between which functions called, for example?
 
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