linux-kernel - Is espfix64's double-fault thing OK on Xen?

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Message-ID: <CALCETrXrVNKNQtxncfOth5OqaSOC7KygerbB-+QQb4_VKESVsA@mail.gmail.com>
Date:	Wed, 9 Jul 2014 16:17:57 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Is espfix64's double-fault thing OK on Xen?

This part in __do_double_fault looks fishy:

    cmpl $__KERNEL_CS,CS(%rdi)
    jne do_double_fault

Shouldn't that be:

    test $3,CS(%rdi)
    jnz do_double_fault

--Andy
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