From: Wandun Chen <chenwandun1@gmail•com>
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
Cc: catalin.marinas@arm•com, will@kernel•org, chenhuacai@kernel•org,
kernel@xen0n•name, pjw@kernel•org, palmer@dabbelt•com,
aou@eecs•berkeley.edu, alex@ghiti•fr, robh@kernel•org,
saravanak@kernel•org, akpm@linux-foundation•org, bhe@redhat•com,
rppt@kernel•org, pasha.tatashin@soleen•com, pratyush@kernel•org,
ruirui.yang@linux•dev, m.szyprowski@samsung•com,
robin.murphy@arm•com, quic_obabatun@quicinc•com
Subject: [PATCH v3 10/11] riscv: kdump: exclude non-dumpable reserved memory regions from vmcore
Date: Wed, 27 May 2026 11:29:16 +0800 [thread overview]
Message-ID: <20260527032917.3385849-11-chenwandun1@gmail.com> (raw)
In-Reply-To: <20260527032917.3385849-1-chenwandun1@gmail.com>
From: Wandun Chen <chenwandun@lixiang•com>
Apply the same non-dumpable reserved memory filtering to RISC-V kdump
as was done for arm64. Use of_reserved_mem_kdump_exclude() to drop
flagged regions from the elfcorehdr PT_LOAD segments, and
of_reserved_mem_kdump_nr_ranges() to pre-size the crash_mem array.
Signed-off-by: Wandun Chen <chenwandun@lixiang•com>
---
arch/riscv/kernel/machine_kexec_file.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/riscv/kernel/machine_kexec_file.c b/arch/riscv/kernel/machine_kexec_file.c
index 54e2d9552e93..c359cf714c79 100644
--- a/arch/riscv/kernel/machine_kexec_file.c
+++ b/arch/riscv/kernel/machine_kexec_file.c
@@ -10,6 +10,7 @@
#include <linux/elf.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_reserved_mem.h>
#include <linux/libfdt.h>
#include <linux/types.h>
#include <linux/memblock.h>
@@ -63,6 +64,7 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
nr_ranges = 1; /* For exclusion of crashkernel region */
walk_system_ram_res(0, -1, &nr_ranges, get_nr_ram_ranges_callback);
+ nr_ranges += of_reserved_mem_kdump_nr_ranges();
cmem = kmalloc_flex(*cmem, ranges, nr_ranges);
if (!cmem)
@@ -76,6 +78,8 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
/* Exclude crashkernel region */
ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end);
+ if (!ret)
+ ret = of_reserved_mem_kdump_exclude(cmem);
if (!ret)
ret = crash_prepare_elf64_headers(cmem, true, addr, sz);
--
2.43.0
next prev parent reply other threads:[~2026-05-27 3:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-27 3:29 [PATCH v3 00/11] kdump: reduce vmcore size and capture time Wandun Chen
2026-05-27 3:29 ` [PATCH v3 01/11] of: reserved_mem: handle NULL name in of_reserved_mem_lookup() Wandun Chen
2026-05-27 3:29 ` [PATCH v3 02/11] kexec/crash: provide crash_exclude_mem_range() stub when CONFIG_CRASH_DUMP=n Wandun Chen
2026-05-27 3:29 ` [PATCH v3 03/11] of: reserved_mem: avoid post-init UAF when alloc_reserved_mem_array() fails Wandun Chen
2026-06-02 16:24 ` Rob Herring
2026-06-03 6:44 ` Wandun
2026-06-03 17:44 ` Rob Herring
2026-06-04 1:48 ` Wandun
2026-05-27 3:29 ` [PATCH v3 04/11] of: reserved_mem: zero total_reserved_mem_cnt if no valid /reserved-memory entry Wandun Chen
2026-05-27 3:29 ` [PATCH v3 05/11] of: reserved_mem: split alloc_reserved_mem_array() from fdt_scan_reserved_mem_late() Wandun Chen
2026-05-27 3:29 ` [PATCH v3 06/11] of: reserved_mem: add dumpable flag to opt-in vmcore Wandun Chen
2026-05-27 3:29 ` [PATCH v3 07/11] of: reserved_mem: save /memreserve/ entries into the reserved_mem array Wandun Chen
2026-05-27 3:29 ` [PATCH v3 08/11] of: reserved_mem: add kdump helpers to exclude non-dumpable regions Wandun Chen
2026-05-27 3:29 ` [PATCH v3 09/11] arm64: kdump: exclude non-dumpable reserved memory regions from vmcore Wandun Chen
2026-05-29 15:08 ` Will Deacon
2026-05-30 16:25 ` Mike Rapoport
2026-06-01 5:00 ` Baoquan He
2026-06-02 9:34 ` Mike Rapoport
2026-05-27 3:29 ` Wandun Chen [this message]
2026-05-27 3:29 ` [PATCH v3 11/11] loongarch: " Wandun Chen
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