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s=arc-20220608; d=hostedemail.com; t=1733841901; a=rsa-sha256; cv=none; b=sddPbM2XNc9lXfcfksoLMZZ/l/WhyZpgY3fmNBIilfWZA28owlujP2rvurOadMsoSO2n2g J+A4i6OgocGdUsU0GqQk/me2lHhhcPLqcacwEIfRDcfiawPVxtQmSPE+SMoJtpGCQ95d8S m3VFvOywTEXBiwO+GZeHtOQ1T0MepBk= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf29.hostedemail.com: domain of cmarinas@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=cmarinas@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 7B913A41908; Tue, 10 Dec 2024 14:43:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B804BC4CED6; Tue, 10 Dec 2024 14:45:03 +0000 (UTC) Date: Tue, 10 Dec 2024 14:45:01 +0000 From: Catalin Marinas To: Jason Gunthorpe Cc: Will Deacon , ankita@nvidia.com, maz@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, ryan.roberts@arm.com, shahuang@redhat.com, lpieralisi@kernel.org, aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com, targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com, zhiw@nvidia.com, mochs@nvidia.com, udhoke@nvidia.com, dnigam@nvidia.com, alex.williamson@redhat.com, sebastianene@google.com, coltonlewis@google.com, kevin.tian@intel.com, yi.l.liu@intel.com, ardb@kernel.org, akpm@linux-foundation.org, gshan@redhat.com, linux-mm@kvack.org, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 0/1] KVM: arm64: Map GPU memory with no struct pages Message-ID: References: <20241118131958.4609-1-ankita@nvidia.com> <20241210140739.GC15607@willie-the-truck> <20241210141806.GI2347147@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241210141806.GI2347147@nvidia.com> X-Stat-Signature: 8gubygq8q648qmzohmg74oqprq9if4aw X-Rspamd-Queue-Id: A720A120028 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1733841880-557512 X-HE-Meta: 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 R/4oAhWx qQ6VKLTA/NQEerPcc62Xf9sgh82YP6ET8yjtnBSbvh+bQA8Wi5bwYnEPeLM1b90r6uWKGBZaE8hMhj0dQaDBQFNPRF3KkAM+ZtdhUbmH9kypf2hONOfgHNAmnzgqwA7tC/bUU+v73I3g9Q/FNu8dJpxjv0KYFZahXMPDwXwFUuk1vvV87H3Ni++4bNDc65PFKxF/GLIXuVSlazc3wYJT6cQnGYGfaccR7KC0Mm/ofu+uTt1sor4CLx8d9AFYZuElzfk/bKvD6po8Yt34hasIvJqPwfmNakCHWmwtIy0zJmu+4vPMboHilr+p6bWE83K0d/hstL8zMCR4hP8HDzcgNQiAYt5xGmi2DepzvxEvhYCwk6SBxMYDdpeGwejNMgzKqG74IhJvyiWjw19Q= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000132, 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 Tue, Dec 10, 2024 at 10:18:06AM -0400, Jason Gunthorpe wrote: > On Tue, Dec 10, 2024 at 02:07:40PM +0000, Will Deacon wrote: > > On Mon, Nov 18, 2024 at 01:19:57PM +0000, ankita@nvidia.com wrote: > > > The changes are heavily influenced by the insightful discussions between > > > Catalin Marinas and Jason Gunthorpe [1] on v1. Many thanks for their > > > valuable suggestions. > > > > > > Link: https://lore.kernel.org/lkml/20230907181459.18145-2-ankita@nvidia.com [1] > > > > That's a different series, no? It got merged at v9: > > I was confused by this too. v1 of that series included this patch, as > that series went along it became focused only on enabling WC > (Normal-NC) in a VM for device MMIO and this patch for device cachable > memory was dropped off. > > There are two related things: > 1) Device MMIO memory should be able to be Normal-NC in a VM. Already > merged > 2) Device Cachable memory (ie CXL and pre-CXL coherently attached > memory) should be Normal Cachable in a VM, even if it doesn't have > struct page/etc. (this patch) > > IIRC this part was dropped off because of the MTE complexity that > Catalin raised. Indeed, we only merged the Normal NC part at the time. I asked Ankit to drop the cacheable attributes and only focus on getting the other part merged. -- Catalin