linux-kernel - Re: AMD TLB errata, (Was: [PATCH RFC] mm: add MAP_EXCLUSIVE to create exclusive user mappings)

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Message-ID: <20191115143114.GN4131@hirez.programming.kicks-ass.net>
Date:   Fri, 15 Nov 2019 15:31:14 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Dan Williams <dan.j.williams@...el.com>,
        Mike Rapoport <rppt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: AMD TLB errata, (Was: [PATCH RFC] mm: add MAP_EXCLUSIVE to
 create exclusive user mappings)

On Fri, Nov 15, 2019 at 08:12:52AM -0600, Tom Lendacky wrote:
> I talked with some of the hardware folks and if you maintain the same bits
> in the large and small pages (aside from the large page bit) until the
> flush, then the errata should not occur.

Excellent!

Thanks for digging that out Tom.