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Wysocki" , Len Brown , Keith Busch , Jonathan Cameron , 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 Message-ID: <20190409121318.GA16955@infradead.org> References: <155440490809.3190322.15060922240602775809.stgit@dwillia2-desk3.amr.corp.intel.com> <155440492988.3190322.4475460421334178449.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <155440492988.3190322.4475460421334178449.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: Mutt/1.9.2 (2017-12-15) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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?