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Wed, 10 Jun 2026 20:09:32 -0700 (PDT) Message-ID: Date: Thu, 11 Jun 2026 11:09:22 +0800 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev 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> <7ed207fa-4c86-426a-8570-495902ce04c3@gmail.com> Content-Language: en-US In-Reply-To: <7ed207fa-4c86-426a-8570-495902ce04c3@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 6/11/26 10:09, Wandun wrote: > > > 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 Apologies for the formatting issue in my previous email. Here is the properly formatted version. 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 greatly 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 splitting the series into smaller logical groups 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(-) >> >