Date: Wed, 20 Sep 2017 17:04:35 -0700 From: Dave Hansen <dave.hansen@...el.com> To: Tycho Andersen <tycho@...ker.com> Cc: Yisheng Xie <xieyisheng1@...wei.com>, Juerg Haefliger <juerg.haefliger@...onical.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, kernel-hardening@...ts.openwall.com, Marco Benatto <marco.antonio.780@...il.com>, x86@...nel.org Subject: Re: [PATCH v6 03/11] mm, x86: Add support for eXclusive Page Frame Ownership (XPFO) On 09/20/2017 05:02 PM, Tycho Andersen wrote: > ...and makes it easier to pair tlb flushes with changing the > protections. I guess we still need the for loop, because we need to > set/unset the xpfo bits as necessary, but I'll switch it to a single > set_kpte(). This also implies that the xpfo bits should all be the > same on every page in the mapping, which I think is true. FWIW, it's a bit bonkers to keep all this duplicate xpfo metadata for compound pages. You could probably get away with only keeping it for the head page.
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