LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Pankaj Gupta <pagupta@redhat.com>
To: Barret Rhoden <brho@google.com>
Cc: "Dan Williams" <dan.j.williams@intel.com>,
	"David Hildenbrand" <david@redhat.com>,
	"Dave Jiang" <dave.jiang@intel.com>,
	"Ross Zwisler" <zwisler@kernel.org>,
	"Vishal Verma" <vishal.l.verma@intel.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
	"H. Peter Anvin" <hpa@zytor.com>,
	x86@kernel.org, kvm@vger.kernel.org,
	"yu c zhang" <yu.c.zhang@intel.com>,
	"yi z zhang" <yi.z.zhang@intel.com>
Subject: Re: [PATCH 2/2] kvm: Use huge pages for DAX-backed files
Date: Wed, 14 Nov 2018 04:09:47 -0500 (EST)
Message-ID: <1826878055.33695230.1542186587142.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <20181113105628.37449f52@gnomeregan.cam.corp.google.com>


> > As this patch is dependent on PageReserved patch(which is in progress),
> > just
> > wondering if we are able to test the code path for hugepage with DAX.
> 
> For testing, I used the following patch.  It's not 100%, since it
> intercepts at kvm_is_reserved_pfn(), and not PageReserved() directly.
> The only difference is with kvm_set_pfn_dirty() I think.
> 

Yes, this should be ok.

Thanks,
Pankaj 

> I also have a nasty module that would dump the EPT's and the host page
> table's mappings so I could confirm that the huge pages are being mapped
> correctly.
> 
> -----------------------
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 2679e476b6c3..1b394a0752a0 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -148,6 +148,10 @@ __weak int kvm_arch_mmu_notifier_invalidate_range(struct
> kvm *kvm,
>  
>  bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
>  {
> +	// XXX hack
> +	if (is_zone_device_page(pfn_to_page(pfn)))
> +		return false;
> +
>  	if (pfn_valid(pfn))
>  		return PageReserved(pfn_to_page(pfn));
>  
> -----------------------
> 
> Thanks,
> 
> Barret
> 
> 

  reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-09 20:39 [PATCH 0/2] " Barret Rhoden
2018-11-09 20:39 ` [PATCH 1/2] mm: make dev_pagemap_mapping_shift() externally visible Barret Rhoden
2018-11-13  9:28   ` David Hildenbrand
2018-11-09 20:39 ` [PATCH 2/2] kvm: Use huge pages for DAX-backed files Barret Rhoden
2018-11-12 19:31   ` Paolo Bonzini
2018-11-13 16:21     ` Barret Rhoden
2018-11-13 18:22       ` Paolo Bonzini
2018-11-13  9:36   ` David Hildenbrand
2018-11-13 10:02     ` Pankaj Gupta
2018-11-13 12:41       ` Paolo Bonzini
2018-11-13 15:56       ` Barret Rhoden
2018-11-14  9:09         ` Pankaj Gupta [this message]
2018-11-13 15:50     ` Barret Rhoden
2018-11-14 21:51 ` [PATCH v2 0/3] " Barret Rhoden
2018-11-14 21:51   ` [PATCH v2 1/3] mm: make dev_pagemap_mapping_shift() externally visible Barret Rhoden
2018-11-26 16:50     ` Paolo Bonzini
2018-11-26 18:32     ` Dan Williams
2018-11-14 21:51   ` [PATCH v2 2/3] kvm: Use huge pages for DAX-backed files Barret Rhoden
2018-11-14 21:51   ` [PATCH v2 3/3] kvm: remove redundant PageReserved() check Barret Rhoden
2018-11-27 13:31     ` David Hildenbrand
2018-11-15  0:55   ` [PATCH v2 0/3] kvm: Use huge pages for DAX-backed files Dan Williams
2018-12-03 17:40     ` Barret Rhoden
2018-12-03 18:32       ` Alexander Duyck

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1826878055.33695230.1542186587142.JavaMail.zimbra@redhat.com \
    --to=pagupta@redhat.com \
    --cc=bp@alien8.de \
    --cc=brho@google.com \
    --cc=dan.j.williams@intel.com \
    --cc=dave.jiang@intel.com \
    --cc=david@redhat.com \
    --cc=hpa@zytor.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-nvdimm@lists.01.org \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=rkrcmar@redhat.com \
    --cc=tglx@linutronix.de \
    --cc=vishal.l.verma@intel.com \
    --cc=x86@kernel.org \
    --cc=yi.z.zhang@intel.com \
    --cc=yu.c.zhang@intel.com \
    --cc=zwisler@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git