Package: kexec-tools
Version: 1:2.0.4-1
Severity: normal
Tags: upstream, patch
Dear Maintainer,
I'm trying to use kexec to boot a multiboot image. My image
relies on mbi->mem_lower being correct, but the current code
combined with a stock debian kernel always fills this field in
with zero.
The problem is that the debian stock kernel protects the first
few pages (from physical address zero) so they don't appear in
/proc/iomem -- so the test in kexec-multiboot-x86.c to
find the low memory fails -- there's never any visible memroy at
location zero in /proc/iomem.
My suggested fix is attached.
---
kexec/arch/i386/kexec-multiboot-x86.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
Index: kexec-tools-2.0.4/kexec/arch/i386/kexec-multiboot-x86.c
===================================================================
--- kexec-tools-2.0.4.orig/kexec/arch/i386/kexec-multiboot-x86.c
2013-03-14 18:45:16.000000000 +1000
+++ kexec-tools-2.0.4/kexec/arch/i386/kexec-multiboot-x86.c 2014-01-15
10:21:02.138172304 +1000
@@ -261,10 +261,18 @@ int multiboot_x86_load(int argc, char **
mmap[i].length_high = length >> 32;
if (range[i].type == RANGE_RAM) {
mmap[i].Type = 1; /* RAM */
- /* Is this the "low" memory? */
- if ((range[i].start == 0)
- && (range[i].end > mem_lower))
+ /*
+ * Is this the "low" memory? Can't just test
+ * against zero, because Linux protects (and
+ * hides) the first few pages of physical
+ * memory.
+ */
+
+ if ((range[i].start <= 64*1024)
+ && (range[i].end > mem_lower)) {
+ range[i].start = 0;
mem_lower = range[i].end;
+ }
/* Is this the "high" memory? */
if ((range[i].start <= 0x100000)
&& (range[i].end > mem_upper + 0x100000))
-- System Information:
Debian Release: jessie/sid
APT prefers unstable
APT policy: (990, 'unstable'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.13.0-rc8 (SMP w/8 CPU cores)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages kexec-tools depends on:
ii debconf [debconf-2.0] 1.5.52
ii libc6 2.17-97
kexec-tools recommends no packages.
kexec-tools suggests no packages.
-- debconf information:
* kexec-tools/load_kexec: true
kexec-tools/use_grub_config: false
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