Messages in this thread | | | Date | Mon, 21 Apr 2008 16:00:55 +0200 | From | Pavel Machek <> | Subject | Re: [RFC PATCH] x86 NMI-safe INT3 and Page Fault (v5) |
| |
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?
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
| |