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From: Paolo Bonzini <pbonzini@redhat.com>
To: Barret Rhoden <brho@google.com>, Dan Williams <dan.j.williams@intel.com>
Cc: Dave Jiang <dave.jiang@intel.com>,
	zwisler@kernel.org, Vishal L Verma <vishal.l.verma@intel.com>,
	rkrcmar@redhat.com, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	linux-nvdimm <linux-nvdimm@lists.01.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
	KVM list <kvm@vger.kernel.org>,
	"Zhang, Yu C" <yu.c.zhang@intel.com>,
	"Zhang, Yi Z" <yi.z.zhang@intel.com>
Subject: Re: [RFC PATCH] kvm: Use huge pages for DAX-backed files
Date: Tue, 6 Nov 2018 11:19:18 +0100	[thread overview]
Message-ID: <876d5a71-8dda-4728-5329-4e169777ba4a@redhat.com> (raw)
In-Reply-To: <20181102163254.04be68b5@gnomeregan.cam.corp.google.com>

On 02/11/2018 21:32, Barret Rhoden wrote:
> One of the other things I noticed was some places in KVM make a
> distinction between kvm_is_reserved_pfn and PageReserved:
> 
> void kvm_set_pfn_dirty(kvm_pfn_t pfn)
> {
>         if (!kvm_is_reserved_pfn(pfn)) {
>                 struct page *page = pfn_to_page(pfn);
> 
>                 if (!PageReserved(page))
>                         SetPageDirty(page);
>         }
> }
> 
> I think we want to SetPageDirty for DAX, so making PageReserved be true
> for DAX seems like the way to go, or we'll need more KVM-specific
> changes.  Apologies is this was discussed in the previous thread on this
> topic and is redundant.

Isn't it the opposite?  We want SetPageDirty, so PageReserved must _not_
be true.

Paolo

  reply	other threads:[~2018-11-06 10:19 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-29 21:07 Barret Rhoden
2018-10-29 22:25 ` Dan Williams
2018-10-30  0:28   ` Barret Rhoden
2018-10-30  3:10     ` Dan Williams
2018-10-30 19:45       ` Barret Rhoden
2018-10-31  8:49         ` Paolo Bonzini
2018-11-02 20:32           ` Barret Rhoden
2018-11-06 10:19             ` Paolo Bonzini [this message]
2018-11-06 16:22               ` Barret Rhoden
2018-10-31  3:05       ` Yu Zhang
2018-10-31  8:52   ` Paolo Bonzini
2018-10-31 21:16     ` Dan Williams
2018-11-06 10:22       ` Paolo Bonzini
2018-11-06 21:05 ` Barret Rhoden
2018-11-06 21:16   ` Paolo Bonzini
2018-11-06 21:17     ` Barret Rhoden

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