linux-kernel - Re: [RFC PATCH 0/3] arm64: support FEAT_BBM level 2 and large block mapping when rodata=full

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: <6714a00a-220e-c43b-7f06-4a2397159cd7@gentwo.org>
Date: Wed, 11 Dec 2024 09:24:33 -0800 (PST)
From: "Christoph Lameter (Ampere)" <cl@...two.org>
To: Will Deacon <will@...nel.org>
cc: Yang Shi <yang@...amperecomputing.com>, catalin.marinas@....com, 
    scott@...amperecomputing.com, linux-arm-kernel@...ts.infradead.org, 
    linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/3] arm64: support FEAT_BBM level 2 and large block
 mapping when rodata=full

On Tue, 10 Dec 2024, Will Deacon wrote:

> > With FEAT_BBM level 2 support, splitting large block page table to
> > smaller ones doesn't need to make the page table entry invalid anymore.
> > This allows kernel split large block mapping on the fly.
>
> I think you can still get TLB conflict aborts in this case, so this
> doesn't work. Hopefully the architecture can strengthen this in the

Which platforms get TLB conflicts? Ours does not. Is this an errata on
some platforms?