linux-kernel - Re: [PATCH V5 1/3] riscv: mm: Prepare for reusing PTE RSW bit(9)

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] [day] [month] [year] [list]

Message-ID: <g2dmtynytclbygcmzaifqrbi64ozw4e5y4mpd2pipsnlwhmhyx@xiy2w5x75fnm>
Date: Wed, 5 Feb 2025 11:19:39 +1100
From: Alistair Popple <apopple@...dia.com>
To: Björn Töpel <bjorn@...nel.org>
Cc: Chunyan Zhang <zhangchunyan@...as.ac.cn>, 
	Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Alexandre Ghiti <alex@...ti.fr>, 
	Andrew Morton <akpm@...ux-foundation.org>, linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Chunyan Zhang <zhang.lyra@...il.com>, linux-mm@...ck.org
Subject: Re: [PATCH V5 1/3] riscv: mm: Prepare for reusing PTE RSW bit(9)

On Thu, Jan 30, 2025 at 09:42:21AM +0100, Björn Töpel wrote:
> Chunyan Zhang <zhangchunyan@...as.ac.cn> writes:
> 
> > The PTE bit(9) on RISC-V is reserved for software, it is used by devmap
> > now which has to be disabled if we want to use bit(9) for other features,
> > since there's no more free PTE bit on RISC-V now.
> >
> > So to make ARCH_HAS_PTE_DEVMAP selectable, this patch uses it as
> > the build condition of devmap definitions.
> 
> Heads-up: It seems like Alistair's series [1] that removes the devmap
> PTE bit will most likely land in 6.15.
 
That is indeed the plan/hope. I just reposted the series based on v6.14-rc1.
Note that I didn't include the devmap PTE change in the repost as I plan on
posting that as a separate followup series but I'm hoping both will make it
for v6.15.

 - Alistair

> Björn
> 
> [1] https://lore.kernel.org/linux-mm/cover.11189864684e31260d1408779fac9db80122047b.1736488799.git-series.apopple@nvidia.com/