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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767822757; bh=RFll13xZ/a5vC1iqrVrPAUqu5AGsBMq8qegGaJ9IV3o=; h=Date:Subject:To:References:From:Cc:In-Reply-To:From; b=kzuQX9u/cZr0QC7rtGsqNU2g8oz3UN556bmK7px+7qe0KfaGafNnQSF2uKAobn4gn c5wZGdvUbvGUo9i0PJ3pb1Bj4HrPQQ4PEwKvP9Qggas/f/nKSy4vViL0IyEafDPObU rnf1Pb4C7Esc2PZ8u0sPSQ55JMiuG17wzQELDBoPvUpPIwzVBGM79vvR6r4bnefHE6 OWCYAEgt2UBlH3gS3ZEI0/gUWw6yBU54EbRSfqP0iAGFDfj+SH+t4h9yJf817nmLer RgOaozskdLOCIerGzgT9YGtBPGAk12Q9ngyJlLnGMo2Oh+kvrY1G55YhWpgdRuFFzN Cdk8bCTPZqElA== Message-ID: <7737563a-c2b8-4e9e-ac18-3551ed9d1a33@kernel.org> Date: Wed, 7 Jan 2026 22:52:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Invitation] bi-weekly guest_memfd upstream call on 2025-12-04 To: dan.j.williams@intel.com, "linux-coco@lists.linux.dev" , "linux-mm@kvack.org" , KVM References: <66c32ad4-a59a-425e-8a00-bcfb918e7559@kernel.org> <695ec54cf5c3_875d1009d@dwillia2-mobl4.notmuch> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Cc: Ackerley Tng Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: F2EFB1A0004 X-Stat-Signature: mmneyjkibr9nsp7k43y1jxzi1wey4tdt X-HE-Tag: 1767822757-772540 X-HE-Meta: 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 V5yh5n/W 4sgX6uIoDCgxt4lsjH9vUYP6vkuQWidxRQ4g5ZHPj5J6seBBiuewNoIT2WSAiGLTJJzT6JoEkMKX1K51dBVi/SXYW5F9uDIkfBN3AknDvx0cfM9TYFSyA/L4neWfEJoV3q35J7ABKyd7Ow0WaWm9oBGq2zXLDspvBUNqdx0vHigdI1cLbhYFkmETdJSBRlfprJfktWWyfIjSEnUAzlpi6YOaWzRHWPsv/b2wuwgFlgUUUJRUkJjlRos3Lxayo5QSPTyoS4R6+g4dt5d/pRlQ4x34UClxFif4iawxqt96MYy4YZMJleSs9SW5BhRPm4Bkm0g2EnQm1WyrF0IGb5JUyKdZkbectqjhPEF3IaianxRQVcuo= 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: List-Subscribe: List-Unsubscribe: On 1/7/26 21:42, dan.j.williams@intel.com wrote: > David Hildenbrand (Red Hat) wrote: > [..] >> This might be the last meeting this year: I will be traveling for LPC on >> December 11 and December 18. Then, Christmas is already around the >> corner and we'll skip the one on December 25. So we'll probably have our >> next meeting then on January 8. > > Hi David, Hi Dan! > > Great seeing you at LPC! Absolutely :) > Can I grab some time on the agenda to > brainstorm the next level of detail on the topic I briefly ran by you in > the hallway track? I.e. is there a path to decouple dependencies and > land some of the low level huge page support upstream while the > guest_memfd reworks for in place conversion and hugetlbfs backing > continue to mature? Yes, Ackerley already added that to the meeting agenda :) > > As you said this at a minimum needs to be crippled / not production > worthy to maintain focus and momentum on the guest_memfd rework > completion. The observation that shifted my thinking is that, given the > timelines and remaining work, there are solid steps that the low level > implementations can be landing and maturing in advance of that > integration. All net progress for upstream. Right, I think we're good as long as we don't start splitting folios on partial truncation. That is: only allow truncation in THP granularity. I might not be around tomorrow and Ackerley will likely lead the meeting. I'll send out a reminder mail now that I realize I haven't ... -- Cheers David