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Wed, 10 Jun 2026 19:09:48 -0700 (PDT) Message-ID: <7ed207fa-4c86-426a-8570-495902ce04c3@gmail.com> Date: Thu, 11 Jun 2026 10:09:37 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 00/11] kdump: reduce vmcore size and capture time From: Wandun To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, kexec@lists.infradead.org, iommu@lists.linux.dev, zhaomeijing@lixiang.com, Rob Herring , saravanak@kernel.org, bhe@redhat.com, rppt@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, chenhuacai@kernel.org, kernel@xen0n.name Cc: catalin.marinas@arm.com, will@kernel.org, alex@ghiti.fr, akpm@linux-foundation.org, pasha.tatashin@soleen.com, pratyush@kernel.org, ruirui.yang@linux.dev, m.szyprowski@samsung.com, robin.murphy@arm.com References: <20260527032917.3385849-1-chenwandun1@gmail.com> Content-Language: en-US In-Reply-To: <20260527032917.3385849-1-chenwandun1@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/27/26 11:29, Wandun Chen wrote: > From: Wandun Chen > > On SoCs that carve out large firmware-owned reserved memory (GPU > firmware, DSP, modem, camera ISP, NPU, ...), kdump currently dumps > those carveouts as part of system RAM even though their contents are > firmware state that is not useful for kernel crash analysis. > > This series introduces an opt-in 'dumpable' flag [1] on struct > reserved_mem and uses it to filter the elfcorehdr PT_LOAD ranges on > DT-based architectures (arm64, riscv, loongarch). By default reserved > regions are treated as non-dumpable; CMA regions are explicitly opted > in because their pages are returned to the buddy allocator and may > carry key crash-analysis data. > > The series is organized as follows: > Patches 1-3: Pre-existing fixes and a small prep change. > Patches 4-5: Restructure to allow appending /memreserve/ entries. > Patches 6-7: Add a dumpable flag and append /memreserve/ entries. > Patch 8: Add generic kdump helpers. > Patches 9-11: Wire the helpers into arm64, riscv and loongarch kdump > elfcorehdr preparation. Hi, Gentle ping on this series. Status summary: -patch 03: respun separately per Rob's suggestion, picked up for 7.2 -patch 06: Acked-by: Marek Szyprowski -patch 09: Acked-by: Will Deacon The remaining patches (01, 02, 04, 05, 07, 08, 10, 11) are still awaiting review. your feedback would be greately appreciated. I know we are at the end of 7.1 -rc cycle, I don't want to rush this series, just collecting more feedback, and will send next version based on 7.2-rc1. If spliting the series into smaller logical group would make review easier, please let me know. Best regards, Wandun > > v2 --> v3: > 1. Fix out-of-bounds issue if device tree lacks /reserved-memory node.[2] > 2. Fix UAF issue when alloc_reserved_mem_array() fails. > 3. Add some prepare patches. > > v1 --> v2: > 1. v1 added an opt-out DT property ('linux,no-dump'). Per Rob's > feedback [1], v2 drop that property and exclude reserve memory > by default. > 2. Split some prepared patches from the original patches. > 3. Address coding-style comments on patch 5 from Rob. > > [1] https://lore.kernel.org/lkml/20260506144542.GA2072596-robh@kernel.org/ > [2] https://sashiko.dev/#/patchset/20260520091844.592753-1-chenwandun%40lixiang.com?part=4 > > Wandun Chen (11): > of: reserved_mem: handle NULL name in of_reserved_mem_lookup() > kexec/crash: provide crash_exclude_mem_range() stub when > CONFIG_CRASH_DUMP=n > of: reserved_mem: avoid post-init UAF when alloc_reserved_mem_array() > fails > of: reserved_mem: zero total_reserved_mem_cnt if no valid > /reserved-memory entry > of: reserved_mem: split alloc_reserved_mem_array() from > fdt_scan_reserved_mem_late() > of: reserved_mem: add dumpable flag to opt-in vmcore > of: reserved_mem: save /memreserve/ entries into the reserved_mem > array > of: reserved_mem: add kdump helpers to exclude non-dumpable regions > arm64: kdump: exclude non-dumpable reserved memory regions from vmcore > riscv: kdump: exclude non-dumpable reserved memory regions from vmcore > loongarch: kdump: exclude non-dumpable reserved memory regions from > vmcore > > arch/arm64/kernel/machine_kexec_file.c | 6 ++ > arch/loongarch/kernel/machine_kexec_file.c | 6 ++ > arch/riscv/kernel/machine_kexec_file.c | 4 + > drivers/of/fdt.c | 11 +- > drivers/of/of_private.h | 3 + > drivers/of/of_reserved_mem.c | 117 +++++++++++++++++++-- > include/linux/crash_core.h | 6 ++ > include/linux/of_reserved_mem.h | 15 +++ > kernel/dma/contiguous.c | 1 + > 9 files changed, 157 insertions(+), 12 deletions(-) >