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Date: Fri, 16 May 2014 09:54:40 -0700 From: Dave Hansen <dave.hansen@...el.com> To: "H. Peter Anvin" <hpa@...or.com>, David Vrabel <david.vrabel@...rix.com>, linux-kernel@...r.kernel.org CC: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, x86@...nel.org Subject: Re: [PATCH] x86: skip check for spurious faults for non-present faults On 05/15/2014 02:20 PM, H. Peter Anvin wrote: > I'm trying to wrap my head around any forward compatibility > concerns... if we misidentify a fault as spurious that would be bad. FWIW, I did go through the bullets in the SDM's "4.10.4.3 Optional Invalidation". The only condition not covered by this patch is the one that talks about "CR4.SMEP = 0...". But, I don't know of any case where we take a userspace page and make it supervisor-only, so I don't think this is possible now. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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