Re: NMI delivery not correctly working

["Christoph Egger" <Christoph.Egger@amd.com>]

On Tuesday 24 July 2007 19:07:53 Keir Fraser wrote:
> 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.
>

Ah, I see. Tnx. It would be really nice to have
some documentation about hypercalls, though.

Christoph




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