From: Yi Zhang <yi.z.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Dave Hansen <dave.hansen-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Cc: jglisse-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
yu.c.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org,
jack-AlSwsSmVLrQ@public.gmane.org,
david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
rkrcmar-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
hch-jcswGhMUV9g@public.gmane.org,
yi.z.zhang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH V4 4/4] kvm: add a check if pfn is from NVDIMM pmem.
Date: Sat, 1 Sep 2018 00:39:42 +0800 [thread overview]
Message-ID: <20180831163941.GA1220@tiger-server> (raw)
In-Reply-To: <4192066a-79f3-2b3e-386f-c4ec9b6dd8fd-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
On 2018-08-30 at 12:07:11 -0700, Dave Hansen wrote:
> On 08/22/2018 03:58 AM, Zhang Yi wrote:
> > bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
> > {
> > - if (pfn_valid(pfn))
> > - return PageReserved(pfn_to_page(pfn));
> > + struct page *page;
> > +
> > + if (pfn_valid(pfn)) {
> > + page = pfn_to_page(pfn);
> > + return PageReserved(page) && !is_dax_page(page);
> > + }
>
> This is in desperate need of commenting about what it is doing and why.
>
> The changelog alone doesn't cut it.
Thanks, Dave, Will add some comments
prev parent reply other threads:[~2018-08-31 16:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-22 10:55 [PATCH V4 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio Zhang Yi
[not found] ` <cover.1534934405.git.yi.z.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-08-22 10:55 ` [PATCH V4 1/4] kvm: remove redundant reserved page check Zhang Yi
2018-08-22 10:56 ` [PATCH V4 2/4] mm: introduce memory type MEMORY_DEVICE_DEV_DAX Zhang Yi
[not found] ` <c0b53c74379e6d654bbe42471fcef8aa5fd22efd.1534934405.git.yi.z.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-09-19 2:43 ` Pankaj Gupta
2018-08-22 10:56 ` [PATCH V4 3/4] mm: add a function to differentiate the pages is from DAX device memory Zhang Yi
2018-09-19 2:48 ` Pankaj Gupta
2018-08-22 10:58 ` [PATCH V4 4/4] kvm: add a check if pfn is from NVDIMM pmem Zhang Yi
[not found] ` <a4183c0f0adfb6d123599dd306062fd193e83f5a.1534934405.git.yi.z.zhang-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2018-08-29 10:15 ` Pankaj Gupta
[not found] ` <380594559.7598107.1535537748154.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-08-30 19:23 ` Yi Zhang
2018-08-30 19:07 ` Dave Hansen
[not found] ` <4192066a-79f3-2b3e-386f-c4ec9b6dd8fd-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2018-08-31 16:39 ` Yi Zhang [this message]
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