From: Breno Leitao <leitao@debian.org>
To: Jinjie Ruan <ruanjinjie@huawei.com>
Cc: corbet@lwn.net, skhan@linuxfoundation.org,
catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org,
kernel@xen0n.name, maddy@linux.ibm.com, mpe@ellerman.id.au,
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chenjiahao16@huawei.com, hbathini@linux.ibm.com,
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lizhengyu3@huawei.com, x86@kernel.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org,
devicetree@vger.kernel.org, kexec@lists.infradead.org
Subject: Re: [PATCH v11 10/11] arm64: kexec: Add support for crashkernel CMA reservation
Date: Mon, 30 Mar 2026 02:13:57 -0700 [thread overview]
Message-ID: <aco-v4BuRSiZx7yy@gmail.com> (raw)
In-Reply-To: <20260328074013.3589544-11-ruanjinjie@huawei.com>
On Sat, Mar 28, 2026 at 03:40:12PM +0800, Jinjie Ruan wrote:
> Commit 35c18f2933c5 ("Add a new optional ",cma" suffix to the
> crashkernel= command line option") and commit ab475510e042 ("kdump:
> implement reserve_crashkernel_cma") added CMA support for kdump
> crashkernel reservation.
>
> Crash kernel memory reservation wastes production resources if too
> large, risks kdump failure if too small, and faces allocation difficulties
> on fragmented systems due to contiguous block constraints. The new
> CMA-based crashkernel reservation scheme splits the "large fixed
> reservation" into a "small fixed region + large CMA dynamic region": the
> CMA memory is available to userspace during normal operation to avoid
> waste, and is reclaimed for kdump upon crash—saving memory while
> improving reliability.
>
> So extend crashkernel CMA reservation support to arm64. The following
> changes are made to enable CMA reservation:
>
> - Parse and obtain the CMA reservation size along with other crashkernel
> parameters.
> - Call reserve_crashkernel_cma() to allocate the CMA region for kdump.
> - Include the CMA-reserved ranges for kdump kernel to use.
> - Exclude the CMA-reserved ranges from the crash kernel memory to
> prevent them from being exported through /proc/vmcore, which is already
> done in the crash core.
>
> Update kernel-parameters.txt to document CMA support for crashkernel on
> arm64 architecture.
>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Rob Herring (Arm) <robh@kernel.org>
> Acked-by: Baoquan He <bhe@redhat.com>
> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> Acked-by: Ard Biesheuvel <ardb@kernel.org>
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Tested-by: Breno Leitao <leitao@debian.org>
next prev parent reply other threads:[~2026-03-30 9:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-28 7:40 [PATCH v11 00/11] arm64/riscv: Add support for crashkernel CMA reservation Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 01/11] riscv: kexec_file: Fix crashk_low_res not exclude bug Jinjie Ruan
2026-03-30 3:49 ` Guo Ren
2026-03-30 7:11 ` Jinjie Ruan
2026-03-30 7:49 ` Guo Ren
2026-03-28 7:40 ` [PATCH v11 02/11] powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr() Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 03/11] x86/kexec: Fix potential buffer overflow in prepare_elf_headers() Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 04/11] arm64: kexec_file: " Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 05/11] riscv: " Jinjie Ruan
2026-03-30 3:47 ` Guo Ren
2026-03-28 7:40 ` [PATCH v11 06/11] LoongArch: kexec: " Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 07/11] powerpc/crash: sort crash memory ranges before preparing elfcorehdr Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 08/11] crash: Exclude crash kernel memory in crash core Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 09/11] crash: Use crash_exclude_core_ranges() on powerpc Jinjie Ruan
2026-03-28 7:40 ` [PATCH v11 10/11] arm64: kexec: Add support for crashkernel CMA reservation Jinjie Ruan
2026-03-30 9:13 ` Breno Leitao [this message]
2026-03-28 7:40 ` [PATCH v11 11/11] riscv: " Jinjie Ruan
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