Messages in this thread | | | Date | Thu, 7 May 2015 12:59:00 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH 084/208] x86/fpu: Rename xsave.header::xstate_bv to 'xfeatures' |
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On Wed, May 06, 2015 at 11:27:47AM -0700, Dave Hansen wrote: > But we'd need to get to a point where we are calling 'xsaves' with a > Requested Feature BitMask (aka RFBM[]) that had holes in it. As it > stands today, we always call it with RFBM=-1 and so we always have > XCOMP_BV = XCR0. > > We'd need to determine which fields are in the init state before we do > an xsaves.
Btw, do we have any perf data as to the improvement the compacted variant brings?
I mean, it means a bunch of jumping through hoops in SW but is it worth it?
Thanks.
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
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