linux-kernel - Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging support, Secure Memory Encryption support

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Date:   Mon, 4 Sep 2017 15:01:46 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
cc:     Ingo Molnar <mingo@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [GIT PULL] x86/mm changes for v4.14: PCID support, 5-level paging
 support, Secure Memory Encryption support

On Mon, 4 Sep 2017, Kirill A. Shutemov wrote:
> On Mon, Sep 04, 2017 at 11:31:58AM +0200, Ingo Molnar wrote:
> > The main changes in this cycle are support for three new, complex hardware 
> > features of x86 CPUs:
> > 
> >  - Add 5-level paging support, which is a new hardware feature on upcoming Intel
> >    CPUs allowing up to 128 PB of virtual address space and 4 PB of physical RAM 
> >    space - a 256-fold increase over the old limits.
> 
> Minor nitpick: I don't see where "256-fold" comes from.
> 
> Virtual address space increased from 256 TB to 128 PB -- 512 times.
> Physical: 64 TB -> 4 PB -- 64 times.

See arch/x86/kernel/tsc.c:

    -johnstul@...ibm.com "math is hard, lets go shopping!"