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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-476bb7f31f0sm22865331cf.64.2025.03.14.06.46.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Mar 2025 06:46:42 -0700 (PDT) Date: Fri, 14 Mar 2025 09:46:40 -0400 From: Gregory Price To: Jonathan Cameron Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [LSF/MM] CXL Boot to Bash - Section 0a: CFMWS and NUMA Flexiblity Message-ID: References: <20250313172004.00002236@huawei.com> <20250314110942.0000476a@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250314110942.0000476a@huawei.com> X-Rspamd-Server: rspam07 X-Rspam-User: X-Stat-Signature: 8sd5wpf51g1qjjaa6ptyddq6erdpubzm X-Rspamd-Queue-Id: 92B40C0011 X-HE-Tag: 1741960003-499215 X-HE-Meta: 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 6J2ADXxl sgm3AtDXnC0/Fal8NRowA8yvMFpe7AxmFNkXEN3wjc29GHkNd4rn2yBfKQJAnhJKpHXd0RC5OkvF8M3noU4+eropo19HplYD5RzpWvyPcohQ6OxK/jwYOegDkP1krnncjUKdEusQcZbtgR6GnS9GJgs9u3ogH3BmxMjPzzpOQMi1xz34EX/xVo1zxHtqydJfs6sfgxJ3IPixyrWMxrJ/e5rTQS80w/wylqGItf6DRxzjE+ilDtBW4CfLH2cAOv4LR8RPeapfx+PRRDy+NHBrUNUUQOm/XTn6Xnqt7TNswK6ulM89euGd+lpyrjuIBb6qypnEaNzaSzWDcD0c= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000014, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Mar 14, 2025 at 11:09:42AM +0000, Jonathan Cameron wrote: > > > > I was unaware that we blocked mapping persistent as volatile. I was > > working off the assumption that could be flexible mapped similar to... > > er... older, non-cxl hardware... cough. > > You can use it as volatile, but that doesn't mean we allow it in a CFMWS > that says the host PA range is not suitable for persistent. > A BIOS might though I think. > aaaaaaaaaaaaah this helps. Ok, we can repurpose the hardware, but not the CFMWS. Even more pressure on platforms to get it right :P. > > > > Along with the above note, and as mentioned on discord, I think this > > whole section naturally evolves into a library of "Sane configurations" > > and "We promise nothing for `reasons`" configurations. > > :) Snag is that as Dan pointed out on discord we assume this applies > even without the lock. So it is possible to have device and host > hardware combinations where things are forced to be very non-intuitive. > Right, but i think that falls into "We promise nothing, for `reasons`". At the very least it would give us a communication tool that helps bridge the gap between platform, linux, and end-users. Or it'd just makes it all worse, one of the two. ~Gregory