linux-kernel - Re: [PATCH] mmu_notifier, kvm: Introduce dirty bit tracking in spte and mmu notifier to help KSM dirty bit tracking

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20110622154630.GT25383@sequoia.sous-sol.org>
Date:	Wed, 22 Jun 2011 08:46:30 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Izik Eidus <izik.eidus@...ellosystems.com>
Cc:	Chris Wright <chrisw@...s-sol.org>, Nai Xia <nai.xia@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, mtosatti@...hat.com
Subject: Re: [PATCH] mmu_notifier, kvm: Introduce dirty bit tracking in spte
 and mmu notifier to help KSM dirty bit tracking

* Izik Eidus (izik.eidus@...ellosystems.com) wrote:
> On 6/22/2011 3:21 AM, Chris Wright wrote:
> >* Nai Xia (nai.xia@...il.com) wrote:
> >>+	if (!shadow_dirty_mask) {
> >>+		WARN(1, "KVM: do NOT try to test dirty bit in EPT\n");
> >>+		goto out;
> >>+	}
> >This should never fire with the dirty_update() notifier test, right?
> >And that means that this whole optimization is for the shadow mmu case,
> >arguably the legacy case.
> 
> Hi Chris,
> AMD npt does track the dirty bit in the nested page tables,
> so the shadow_dirty_mask should not be 0 in that case...

Yeah, momentary lapse... ;)
--
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/