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From: Dan Williams <dan.j.williams@intel.com>
To: Barret Rhoden <brho@google.com>
Cc: Joao Martins <joao.m.martins@oracle.com>,
	linux-nvdimm <linux-nvdimm@lists.01.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>, KVM list <kvm@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linux MM <linux-mm@kvack.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H . Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
	Liran Alon <liran.alon@oracle.com>,
	Nikita Leshenko <nikita.leshchenko@oracle.com>,
	Boris Ostrovsky <boris.ostrovsky@oracle.com>,
	Matthew Wilcox <willy@infradead.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [PATCH RFC 10/10] nvdimm/e820: add multiple namespaces support
Date: Tue, 4 Feb 2020 08:44:31 -0800	[thread overview]
Message-ID: <CAPcyv4iiSsEOsfEwLQcV3bNDjBSxw1OgWoBdEWPQEymq6=xm-A@mail.gmail.com> (raw)
In-Reply-To: <e605fed8-46f5-6a07-11e6-2cc079a1159b@google.com>

On Tue, Feb 4, 2020 at 7:30 AM Barret Rhoden <brho@google.com> wrote:
>
> Hi -
>
> On 1/10/20 2:03 PM, Joao Martins wrote:
> > User can define regions with 'memmap=size!offset' which in turn
> > creates PMEM legacy devices. But because it is a label-less
> > NVDIMM device we only have one namespace for the whole device.
> >
> > Add support for multiple namespaces by adding ndctl control
> > support, and exposing a minimal set of features:
> > (ND_CMD_GET_CONFIG_SIZE, ND_CMD_GET_CONFIG_DATA,
> > ND_CMD_SET_CONFIG_DATA) alongside NDD_ALIASING because we can
> > store labels.
>
> FWIW, I like this a lot.  If we move away from using memmap in favor of
> efi_fake_mem, ideally we'd have the same support for full-fledged
> pmem/dax regions and namespaces that this patch brings.

No, efi_fake_mem only supports creating dax-regions. What's the use
case that can't be satisfied by just specifying multiple memmap=
ranges?
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  reply	other threads:[~2020-02-04 16:44 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 19:03 [PATCH RFC 00/10] device-dax: Support devices without PFN metadata Joao Martins
2020-01-10 19:03 ` [PATCH RFC 01/10] mm: Add pmd support for _PAGE_SPECIAL Joao Martins
2020-02-03 21:34   ` Matthew Wilcox
2020-02-04 16:14     ` Joao Martins
2020-01-10 19:03 ` [PATCH RFC 02/10] mm: Handle pmd entries in follow_pfn() Joao Martins
2020-02-03 21:37   ` Matthew Wilcox
2020-02-04 16:17     ` Joao Martins
2020-01-10 19:03 ` [PATCH RFC 03/10] mm: Add pud support for _PAGE_SPECIAL Joao Martins
2020-01-10 19:03 ` [PATCH RFC 04/10] mm: Handle pud entries in follow_pfn() Joao Martins
2020-01-10 19:03 ` [PATCH RFC 05/10] device-dax: Do not enforce MADV_DONTFORK on mmap() Joao Martins
2020-01-10 19:03 ` [PATCH RFC 06/10] device-dax: Introduce pfn_flags helper Joao Martins
2020-01-10 19:03 ` [PATCH RFC 07/10] device-dax: Add support for PFN_SPECIAL flags Joao Martins
2020-01-10 19:03 ` [PATCH RFC 08/10] dax/pmem: Add device-dax support for PFN_MODE_NONE Joao Martins
2020-01-10 19:03 ` [PATCH RFC 09/10] vfio/type1: Use follow_pfn for VM_FPNMAP VMAs Joao Martins
     [not found]   ` <20200207210831.GA31015@ziepe.ca>
2020-02-11 16:23     ` Joao Martins
2020-01-10 19:03 ` [PATCH RFC 10/10] nvdimm/e820: add multiple namespaces support Joao Martins
2020-02-04 15:28   ` Barret Rhoden
2020-02-04 16:44     ` Dan Williams [this message]
2020-02-04 18:20       ` Barret Rhoden
2020-02-04 19:24         ` Joao Martins
2020-02-04 21:43         ` Dan Williams
2020-02-04 21:57           ` Barret Rhoden
2020-02-04  1:24 ` [PATCH RFC 00/10] device-dax: Support devices without PFN metadata Dan Williams
2020-02-04 19:07   ` Joao Martins

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