linux-kernel - Re: [PATCH v4 0/2] kvm: Use huge pages for DAX-backed files

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Date:   Thu, 12 Dec 2019 01:22:21 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Barret Rhoden <brho@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>
Cc:     linux-nvdimm@...ts.01.org, x86@...nel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jason.zeng@...el.com
Subject: Re: [PATCH v4 0/2] kvm: Use huge pages for DAX-backed files

On 11/12/19 22:32, Barret Rhoden wrote:
> This patchset allows KVM to map huge pages for DAX-backed files.
> 
> I held previous versions in limbo while people were sorting out whether
> or not DAX pages were going to remain PageReserved and how that relates
> to KVM.
> 
> Now that that is sorted out (DAX pages are PageReserved, but they are
> not kvm_is_reserved_pfn(), and DAX pages are considered on a
> case-by-case basis for KVM), I can repost this.
> 
> v3 -> v4:
> v3: https://lore.kernel.org/lkml/20190404202345.133553-1-brho@google.com/
> - Rebased onto linus/master
> 
> v2 -> v3:
> v2: https://lore.kernel.org/lkml/20181114215155.259978-1-brho@google.com/
> - Updated Acks/Reviewed-by
> - Rebased onto linux-next
> 
> 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
> 
> RFC/discussion thread:
> https://lore.kernel.org/lkml/20181029210716.212159-1-brho@google.com/
> 
> Barret Rhoden (2):
>   mm: make dev_pagemap_mapping_shift() externally visible
>   kvm: Use huge pages for DAX-backed files
> 
>  arch/x86/kvm/mmu/mmu.c | 36 ++++++++++++++++++++++++++++++++----
>  include/linux/mm.h     |  3 +++
>  mm/memory-failure.c    | 38 +++-----------------------------------
>  mm/util.c              | 34 ++++++++++++++++++++++++++++++++++
>  4 files changed, 72 insertions(+), 39 deletions(-)
> 

Thanks, with the Acked-by already in place for patch 1 I can pick this up.

Paolo