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b=szeDtN1Hy2mboR7182GvWrEih1Lqvgrh7pESUmR/yxOa4iGH7GLgRDPaODJaaE42E Q+mUqvDPSjsg56jvX+7rgJ1+wuPyUugI4QU/jpJZlt8NSRls1xYbHigLf8KA27pGV+ LiE1RsPffr5SnYhj3RJQ8MfSiAYdO3wvehZpTQO0AoNc+ro1RudQcLbP8Uiik3qY4D UEl+ngboJUpZcyvGg3dJ9kw0qNnqJsNzQejNlMtzWf9q2PGHr/0aoS2I29IdueHFZe MpfEcwSK+HrwPgxcHuYeJBngcROm/G86N0o3yCi9jpH9ZwG3tQ8HANOL+ZWT3ymxVt cEb+lKQGlJtxg== Date: Mon, 8 Sep 2025 13:34:56 +0300 From: Mike Rapoport To: Andrew Morton Cc: Alexander Graf , Baoquan He , Changyuan Lyu , Chris Li , Jason Gunthorpe , Pasha Tatashin , Pratyush Yadav , kexec@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 0/2] kho: add support for preserving vmalloc allocations Message-ID: References: <20250907070022.2177974-1-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250907070022.2177974-1-rppt@kernel.org> X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 645AF140008 X-Stat-Signature: bmuxk9p4kn7kwr1ieyw5opkdq6khk6zt X-Rspam-User: X-HE-Tag: 1757327703-765619 X-HE-Meta: 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 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: Argh, I've messed up the posting :( Sorry for the noise. On Sun, Sep 07, 2025 at 10:00:17AM +0300, Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > Hi, > > Following the discussion about preservation of memfd with LUO [1] these > patches add support for preserving vmalloc allocations. > > Any KHO uses case presumes that there's a data structure that lists > physical addresses of preserved folios (and potentially some additional > metadata). Allowing vmalloc preservations with KHO allows scalable > preservation of such data structures. > > For instance, instead of allocating array describing preserved folios in > the fdt, memfd preservation can use vmalloc: > > preserved_folios = vmalloc_array(nr_folios, sizeof(*preserved_folios)); > memfd_luo_preserve_folios(preserved_folios, folios, nr_folios); > kho_preserve_vmalloc(preserved_folios, &folios_info); > > [1] https://lore.kernel.org/all/20250807014442.3829950-30-pasha.tatashin@soleen.com > > v2 changes: > * support preservation of vmalloc backed by large pages > * add check for supported vmalloc flags and preserve the flags to be > able to identify incompatible preservations > * don't use kho_preserve_phys() > * add kernel-doc > > v1: https://lore.kernel.org/all/20250903063018.3346652-1-rppt@kernel.org > > Mike Rapoport (Microsoft) (2): > kho: add support for preserving vmalloc allocations > lib/test_kho: use kho_preserve_vmalloc instead of storing addresses in fdt > > include/linux/kexec_handover.h | 12 ++ > kernel/kexec_handover.c | 200 +++++++++++++++++++++++++++++++++ > lib/test_kho.c | 30 +++-- > 3 files changed, 235 insertions(+), 7 deletions(-) > > > base-commit: b320789d6883cc00ac78ce83bccbfe7ed58afcf0 > -- > 2.50.1 > -- Sincerely yours, Mike.