linux-kernel - Re: [PATCH v2 0/3] kvm: Use huge pages for DAX-backed files

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Date:   Wed, 14 Nov 2018 16:55:54 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Barret Rhoden <brho@...gle.com>
Cc:     Dave Jiang <dave.jiang@...el.com>, zwisler@...nel.org,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>, rkrcmar@...hat.com,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        KVM list <kvm@...r.kernel.org>,
        "Zhang, Yu C" <yu.c.zhang@...el.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>,
        alexander.h.duyck@...ux.intel.com
Subject: Re: [PATCH v2 0/3] kvm: Use huge pages for DAX-backed files

[ add Alex who is looking into removing PageReserved for DAX pages. ]
On Wed, Nov 14, 2018 at 1:53 PM Barret Rhoden <brho@...gle.com> wrote:
>
> This patch series depends on dax pages not being PageReserved.  Once
> that is in place, these changes will let KVM use huge pages with
> dax-backed files.  Without the PageReserved change, KVM and DAX still
> work with these patches, simply without huge pages - which is the
> current situation.
>
> RFC/discussion thread:
> https://lore.kernel.org/lkml/20181029210716.212159-1-brho@google.com/
>
> v1 -> v2:
> https://lore.kernel.org/lkml/20181109203921.178363-1-brho@google.com/
>
> - Updated Acks/Reviewed-by
> - Minor touchups
> - Added patch to remove redundant PageReserved() check
> - Rebased onto linux-next
>
>
> Barret Rhoden (3):
>   mm: make dev_pagemap_mapping_shift() externally visible
>   kvm: Use huge pages for DAX-backed files
>   kvm: remove redundant PageReserved() check
>
>  arch/x86/kvm/mmu.c  | 33 +++++++++++++++++++++++++++++++--
>  include/linux/mm.h  |  3 +++
>  mm/memory-failure.c | 38 +++-----------------------------------
>  mm/util.c           | 34 ++++++++++++++++++++++++++++++++++
>  virt/kvm/kvm_main.c |  8 ++------
>  5 files changed, 73 insertions(+), 43 deletions(-)
>
> --
> 2.19.1.1215.g8438c0b245-goog
>