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From: Christoph Hellwig <hch@infradead.org>
To: Dan Williams <dan.j.williams@intel.com>
Cc: linux-kernel@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>, Keith Busch <keith.busch@intel.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	vishal.l.verma@intel.com, x86@kernel.org, linux-mm@kvack.org,
	linux-nvdimm@lists.01.org
Subject: Re: [RFC PATCH 4/5] acpi/hmat: Register special purpose memory as a device
Date: Tue, 9 Apr 2019 05:13:18 -0700
Message-ID: <20190409121318.GA16955@infradead.org> (raw)
In-Reply-To: <155440492988.3190322.4475460421334178449.stgit@dwillia2-desk3.amr.corp.intel.com>

On Thu, Apr 04, 2019 at 12:08:49PM -0700, Dan Williams wrote:
> Memory that has been tagged EFI_SPECIAL_PURPOSE, and has performance
> properties described by the ACPI HMAT is expected to have an application
> specific consumer.
> 
> Those consumers may want 100% of the memory capacity to be reserved from
> any usage by the kernel. By default, with this enabling, a platform
> device is created to represent this differentiated resource.

This sounds more than weird.  Since when did we let the firmware decide
who can use the memory?

  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-04 19:08 [RFC PATCH 0/5] EFI Special Purpose Memory Support Dan Williams
2019-04-04 19:08 ` [RFC PATCH 1/5] efi: Detect UEFI 2.8 Special Purpose Memory Dan Williams
2019-04-06  4:21   ` Ard Biesheuvel
2019-04-09 16:43     ` Dan Williams
2019-04-09 17:21       ` Ard Biesheuvel
2019-04-10  2:10         ` Dan Williams
2019-04-12 20:43           ` Ard Biesheuvel
2019-04-12 21:18             ` Dan Williams
2019-04-15 11:43       ` Enrico Weigelt, metux IT consult
2019-04-04 19:08 ` [RFC PATCH 2/5] lib/memregion: Uplevel the pmem "region" ida to a global allocator Dan Williams
2019-04-04 19:32   ` Matthew Wilcox
2019-04-04 21:02     ` Dan Williams
2019-04-04 19:08 ` [RFC PATCH 3/5] acpi/hmat: Track target address ranges Dan Williams
2019-04-04 20:58   ` Keith Busch
2019-04-04 20:58     ` Dan Williams
2019-04-04 19:08 ` [RFC PATCH 4/5] acpi/hmat: Register special purpose memory as a device Dan Williams
2019-04-05 11:18   ` Jonathan Cameron
2019-04-05 15:43     ` Dan Williams
2019-04-05 16:23       ` Jonathan Cameron
2019-04-05 16:56         ` Dan Williams
2019-04-05 17:39           ` Jonathan Cameron
2019-04-09 12:13   ` Christoph Hellwig [this message]
2019-04-09 14:49     ` Dan Williams
2019-04-04 19:08 ` [RFC PATCH 5/5] device-dax: Add a driver for "hmem" devices Dan Williams

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