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From: "Brendan Jackman" To: "Takahiro Itazuri" , , Cc: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v12 00/16] Direct Map Removal Support for guest_memfd References: <20260506080753.14517-1-itazur@amazon.com> In-Reply-To: <20260506080753.14517-1-itazur@amazon.com> X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 150D940009 X-Stat-Signature: 5y4i7erku3p76o6pse55rz6hs9baeufe X-HE-Tag: 1782487750-425911 X-HE-Meta: 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 22HzN4rn 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed May 6, 2026 at 8:07 AM UTC, Takahiro Itazuri wrote: > Hi Lorenzo and Sean, > > Apologies for the delayed reply =E2=80=94 Nikita is leaving Amazon, and I= 'm > taking over this series going forward. Thanks for your patience. > > On Tue, Apr 21, 2026 at 01:40:00PM +0000, Lorenzo Stoakes wrote: >> Hm, given this touches a fair bit of mm, I wonder if we shouldn't try to= do this >> through the mm tree? > > On Tue, Apr 21, 2026 at 04:36:00PM +0000, Sean Christopherson wrote: >> Yeah, when the time comes, the mm pieces definitely need to go through t= he mm >> tree. Ideally, I think this would be merged in two separate parts, with= all mm >> changes going through the mm tree, and then the KVM changes through the = KVM tree >> using a stable topic branch/tag from Andrew. > > Thanks for the guidance. The split makes sense to me; I'm planning to > follow this approach with patches 1-6 (mm) going through the mm tree > and patches 7-16 (KVM) through the KVM tree on top of a stable > branch/tag from mm. I'll confirm the exact boundary and coordination > details as I prepare the repost. > > On Tue, Apr 21, 2026 at 01:40:00PM +0000, Lorenzo Stoakes wrote: >> In any case, we definitely need a rebase on something not-next :) if not= mm then >> Linus's tree at least maybe? >> >> I'm seeing a lot of conflicts against mm-unstable, it can't b4 shazam ev= en patch >> 1 and in Linus's tree it's failing at an mm patch (mm: introduce >> AS_NO_DIRECT_MAP). > Just as an FYI, I am gonna look at trying to move this forward a bit while Takahiro ramps up on taking over (I spoke to him about this off list). My ulterior motive is that this would give me an excuse to add ALLOC_UNMAPPED (formerly __GFP_UNMAPPED) and the mermap [0] which unblocks various security nonsense including ASI [1]. (But also, this feature is a good idea). [0] https://lore.kernel.org/all/20260320-page_alloc-unmapped-v2-0-28bf1bd54= f41@google.com/ [1] https://linuxasi.dev