This is a note to let you know that I've just added the patch titled
powerpc/kexec_file: fix FDT size estimation for kdump kernel
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-kexec_file-fix-fdt-size-estimation-for-kdump-kernel.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 2377c92e37fe97bc5b365f55cf60f56dfc4849f5 Mon Sep 17 00:00:00 2001
From: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Date: Thu, 4 Feb 2021 17:01:10 +0530
Subject: powerpc/kexec_file: fix FDT size estimation for kdump kernel
From: Hari Bathini <hbathini@xxxxxxxxxxxxx>
commit 2377c92e37fe97bc5b365f55cf60f56dfc4849f5 upstream.
On systems with large amount of memory, loading kdump kernel through
kexec_file_load syscall may fail with the below error:
"Failed to update fdt with linux,drconf-usable-memory property"
This happens because the size estimation for kdump kernel's FDT does
not account for the additional space needed to setup usable memory
properties. Fix it by accounting for the space needed to include
linux,usable-memory & linux,drconf-usable-memory properties while
estimating kdump kernel's FDT size.
Fixes: 6ecd0163d360 ("powerpc/kexec_file: Add appropriate regions for memory reserve map")
Cc: stable@xxxxxxxxxxxxxxx # v5.9+
Signed-off-by: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/161243826811.119001.14083048209224609814.stgit@hbathini
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/kexec.h | 1 +
arch/powerpc/kexec/elf_64.c | 2 +-
arch/powerpc/kexec/file_load_64.c | 35 +++++++++++++++++++++++++++++++++++
3 files changed, 37 insertions(+), 1 deletion(-)
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -136,6 +136,7 @@ int load_crashdump_segments_ppc64(struct
int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
const void *fdt, unsigned long kernel_load_addr,
unsigned long fdt_load_addr);
+unsigned int kexec_fdt_totalsize_ppc64(struct kimage *image);
int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
unsigned long initrd_load_addr,
unsigned long initrd_len, const char *cmdline);
--- a/arch/powerpc/kexec/elf_64.c
+++ b/arch/powerpc/kexec/elf_64.c
@@ -102,7 +102,7 @@ static void *elf64_load(struct kimage *i
pr_debug("Loaded initrd at 0x%lx\n", initrd_load_addr);
}
- fdt_size = fdt_totalsize(initial_boot_params) * 2;
+ fdt_size = kexec_fdt_totalsize_ppc64(image);
fdt = kmalloc(fdt_size, GFP_KERNEL);
if (!fdt) {
pr_err("Not enough memory for the device tree.\n");
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -21,6 +21,7 @@
#include <linux/memblock.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
+#include <asm/setup.h>
#include <asm/drmem.h>
#include <asm/kexec_ranges.h>
#include <asm/crashdump-ppc64.h>
@@ -926,6 +927,40 @@ out:
}
/**
+ * kexec_fdt_totalsize_ppc64 - Return the estimated size needed to setup FDT
+ * for kexec/kdump kernel.
+ * @image: kexec image being loaded.
+ *
+ * Returns the estimated size needed for kexec/kdump kernel FDT.
+ */
+unsigned int kexec_fdt_totalsize_ppc64(struct kimage *image)
+{
+ unsigned int fdt_size;
+ u64 usm_entries;
+
+ /*
+ * The below estimate more than accounts for a typical kexec case where
+ * the additional space is to accommodate things like kexec cmdline,
+ * chosen node with properties for initrd start & end addresses and
+ * a property to indicate kexec boot..
+ */
+ fdt_size = fdt_totalsize(initial_boot_params) + (2 * COMMAND_LINE_SIZE);
+ if (image->type != KEXEC_TYPE_CRASH)
+ return fdt_size;
+
+ /*
+ * For kdump kernel, also account for linux,usable-memory and
+ * linux,drconf-usable-memory properties. Get an approximate on the
+ * number of usable memory entries and use for FDT size estimation.
+ */
+ usm_entries = ((memblock_end_of_DRAM() / drmem_lmb_size()) +
+ (2 * (resource_size(&crashk_res) / drmem_lmb_size())));
+ fdt_size += (unsigned int)(usm_entries * sizeof(u64));
+
+ return fdt_size;
+}
+
+/**
* setup_new_fdt_ppc64 - Update the flattend device-tree of the kernel
* being loaded.
* @image: kexec image being loaded.
Patches currently in stable-queue which might be from hbathini@xxxxxxxxxxxxx are
queue-5.10/powerpc-kexec_file-fix-fdt-size-estimation-for-kdump-kernel.patch
