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From: Yi Zhang <yi.z.zhang@linux.intel.com>
To: Barret Rhoden <brho@google.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>,
	"Alexander Duyck" <alexander.h.duyck@linux.intel.com>,
	"Zhang, Yu C  <yu.c.zhang@intel.com>,
	KVM list <kvm@vger.kernel.org>,
	linux-nvdimm" <linux-nvdimm@lists.01.org>,
	"Jan Kara" <jack@suse.cz>, "David Hildenbrand" <david@redhat.com>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"Linux MM" <linux-mm@kvack.org>,
	rkrcmar@redhat.com, "Paolo Bonzini" <pbonzini@redhat.com>,
	"Christoph Hellwig" <hch@lst.de>
Subject: Re: [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem.
Date: Mon, 22 Oct 2018 16:47:00 +0800	[thread overview]
Message-ID: <20181022084659.GA84523@tiger-server> (raw)
In-Reply-To: <20181019123348.04ee7dd8@gnomeregan.cam.corp.google.com>

On 2018-10-19 at 12:33:48 -0400, Barret Rhoden wrote:
> On 2018-09-21 at 21:29 David Hildenbrand <david@redhat.com> wrote:
> > On 21/09/2018 20:17, Dan Williams wrote:
> > > On Fri, Sep 21, 2018 at 7:24 AM David Hildenbrand <david@redhat.com> wrote:
> > > [..]  
> > >>> Remove the PageReserved flag sounds more reasonable.
> > >>> And Could we still have a flag to identify it is a device private memory, or
> > >>> where these pages coming from?  
> > >>
> > >> We could use a page type for that or what you proposed. (as I said, we
> > >> might have to change hibernation code to skip the pages once we drop the
> > >> reserved flag).  
> > > 
> > > I think it would be reasonable to reject all ZONE_DEVICE pages in
> > > saveable_page().
> > >   
> > 
> > Indeed, that sounds like the easiest solution - guess that answer was
> > too easy for me to figure out :) .
> > 
> 
> Just to follow-up, is the plan to clear PageReserved for nvdimm pages
> instead of the approach taken in this patch set?  Or should we special
> case nvdimm/dax pages in kvm_is_reserved_pfn()?
Yes, we are going to remove the PageReserved flag for nvdimm pages.
Added Alex, attached the patch-set.
> 
> Thanks,
> 
> Barret
> 
> 
> 
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  reply	other threads:[~2018-10-22  2:07 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-07 18:03 [PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Zhang Yi
2018-09-07 17:04 ` Ahmed S. Darwish
2018-09-18 14:31   ` Yi Zhang
2018-09-07 18:03 ` [PATCH V5 1/4] kvm: remove redundant reserved page check Zhang Yi
2018-09-07 18:03 ` [PATCH V5 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Zhang Yi
2018-09-07 18:03 ` [PATCH V5 3/4] mm: add a function to differentiate the pages is from DAX device memory Zhang Yi
2018-09-07 18:04 ` [PATCH V5 4/4] kvm: add a check if pfn is from NVDIMM pmem Zhang Yi
2018-09-19  2:53   ` Dan Williams
2018-09-19  7:20     ` David Hildenbrand
2018-09-20 22:49       ` Yi Zhang
2018-09-20 21:19         ` Dan Williams
2018-09-21 22:47           ` Yi Zhang
2018-09-21 14:23             ` David Hildenbrand
2018-09-21 18:17               ` Dan Williams
2018-09-21 19:29                 ` David Hildenbrand
2018-10-19 16:33                   ` Barret Rhoden
2018-10-22  8:47                     ` Yi Zhang [this message]
2018-09-19 10:55 ` [PATCH V5 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Yi Zhang
2018-09-19  2:43   ` Pankaj Gupta

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