From: Keir Fraser <keir@xensource.com>
To: Christoph Egger <Christoph.Egger@amd.com>, xen-devel@lists.xensource.com
Subject: Re: NMI delivery not correctly working
Date: Tue, 24 Jul 2007 18:07:53 +0100 [thread overview]
Message-ID: <C2CBF079.12F6E%keir@xensource.com> (raw)
In-Reply-To: <200707241747.23720.Christoph.Egger@amd.com>
On 24/7/07 16:47, "Christoph Egger" <Christoph.Egger@amd.com> wrote:
> I know, there is a line "current->nmi_masked = 0;" in do_iret() in
> xen/arch/x86/x86_(32|64)/traps.c, but this is actually never called
> after NMI delivery.
Guests *must* use the iret hypercall when returning from their NMI handler.
This is giving a virtualised equivalent of the 'NMI-blocking' latch
implemented in x86 processors, which is reset by the IRET instruction.
-- Keir
next prev parent reply other threads:[~2007-07-24 17:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-24 15:47 NMI delivery not correctly working Christoph Egger
2007-07-24 17:07 ` Keir Fraser [this message]
2007-07-24 18:26 ` Kaushik Barde
2007-07-25 6:22 ` Keir Fraser
2007-07-25 6:43 ` Kaushik Barde
2007-07-25 6:55 ` Keir Fraser
2007-07-25 6:48 ` Christoph Egger
2007-07-25 6:57 ` Keir Fraser
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