Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5)

[Pavel Machek]

On Thu 2008-04-17 16:14:10, Mathieu Desnoyers wrote:
> (hopefully finally CCing LKML) :)
> 
> Implements an alternative iret with popf and return so trap and exception
> handlers can return to the NMI handler without issuing iret. iret would cause
> NMIs to be reenabled prematurely. x86_32 uses popf and far return. x86_64 has to
> copy the return instruction pointer to the top of the previous stack, issue a
> popf, loads the previous esp and issue a near return (ret).

sounds expensive. Does it slow down normal loads?

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