linux-kernel - Re: [PATCH v4 0/3] Optimize tlbflush path

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: <ad18523fdf51b426808a6ff115ca3decc8e80aeb.camel@wdc.com>
Date:   Thu, 31 Oct 2019 15:13:16 +0000
From:   Atish Patra <Atish.Patra@....com>
To:     "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>
CC:     "hch@....de" <hch@....de>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        Anup Patel <Anup.Patel@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>
Subject: Re: [PATCH v4 0/3] Optimize tlbflush path

On Thu, 2019-10-24 at 20:09 -0700, Paul Walmsley wrote:
> On Fri, 30 Aug 2019, Paul Walmsley wrote:
> 
> > On Thu, 22 Aug 2019, Atish Patra wrote:
> > 
> > > This series adds few optimizations to reduce the trap cost in the
> > > tlb
> > > flush path. We should only make SBI calls to remote tlb flush
> > > only if
> > > absolutely required. 
> > 
> > The patches look great.  My understanding is that these
> > optimization 
> > patches may actually be a partial workaround for the TLB flushing
> > bug that 
> > we've been looking at for the last month or so, which can corrupt
> > memory 
> > or crash the system.
> 
> I don't think we're any closer to root-causing this
> issue.  Meanwhile, 
> OpenSBI has merged patches to work around it.  So since many of us
> have 
> looked at Atish's TLB optimization patches, and we all think they
> are 
> useful optimizations, let's plan to merge it for v5.5-rc1.
> 
> 

Thanks. These patches still applies cleanly on 5.4-rc5.
Let me know if you need something from myside.

> - Paul

-- 
Regards,
Atish