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KEXEC_ALL_OPTIONS could be used instead defining the same
array several times. This makes code easier to maintain when
new options are added.
Suggested-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Newer s390 kernels support a command line size longer than 896
bytes. Such kernels contain a new member in the parameter area,
which might be utilized by tools like kexec. Older kernels have
the location initialized to zero, so we check whether there's a
non-zero number present and use that. If there isn't, we fallback
to the legacy command line size of 896 bytes.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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When crashkernel is reserved above 4G in memory, kernel should
reserve some amount of low memory for swiotlb and some DMA buffers.
So there may be two crash kernel regions, one is below 4G, the other
is above 4G.
Currently, there is only one crash kernel region on arm64, and pass
"linux,usable-memory-range = <BASE SIZE>" property to crash dump
kernel.
Now, we pass "linux,usable-memory-range = <BASE1 SIZE1 BASE2 SIZE2>"
to crash dump kernel to support two crash kernel regions and load crash
kernel high. Make the low memory region as the second range "BASE2 SIZE2"
to keep compatibility with existing user-space and older kdump kernels.
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Co-developed-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Starting with gcc 11.3, the C compiler will generate PLT-relative function
calls even if they are local and do not require it. Later on during linking,
the linker will replace all PLT-relative calls to local functions with
PC-relative ones. Unfortunately, the purgatory code of kexec/kdump is
not being linked as a regular executable or shared library would have been,
and therefore, all PLT-relative addresses remain in the generated purgatory
object code unresolved. This in turn lets kexec-tools fail with
"Unknown rela relocation: 0x14 0x73c0901c" for such relocation types.
Furthermore, the clang C compiler has always behaved like described above
and this commit should fix the purgatory code built with the latter.
Because the purgatory code is no regular executable or shared library,
contains only calls to local functions and has no PLT, all R_390_PLT32DBL
relocation entries can be resolved just like a R_390_PC32DBL one.
* https://refspecs.linuxfoundation.org/ELF/zSeries/lzsabi0_zSeries/x1633.html#AEN1699
Relocation entries of purgatory code generated with gcc 11.3
------------------------------------------------------------
$ readelf -r purgatory/purgatory.o
Relocation section '.rela.text' at offset 0x6e8 contains 27 entries:
Offset Info Type Sym. Value Sym. Name + Addend
00000000000c 000300000013 R_390_PC32DBL 0000000000000000 .data + 2
00000000001a 001000000014 R_390_PLT32DBL 0000000000000000 sha256_starts + 2
000000000030 001100000014 R_390_PLT32DBL 0000000000000000 sha256_update + 2
000000000046 001200000014 R_390_PLT32DBL 0000000000000000 sha256_finish + 2
000000000050 000300000013 R_390_PC32DBL 0000000000000000 .data + 102
00000000005a 001300000014 R_390_PLT32DBL 0000000000000000 memcmp + 2
...
000000000118 001600000014 R_390_PLT32DBL 0000000000000000 setup_arch + 2
00000000011e 000300000013 R_390_PC32DBL 0000000000000000 .data + 2
00000000012c 000f00000014 R_390_PLT32DBL 0000000000000000 verify_sha256_digest + 2
000000000142 001700000014 R_390_PLT32DBL 0000000000000000
post_verification[...] + 2
Relocation entries of purgatory code generated with gcc 11.2
------------------------------------------------------------
$ readelf -r purgatory/purgatory.o
Relocation section '.rela.text' at offset 0x6e8 contains 27 entries:
Offset Info Type Sym. Value Sym. Name + Addend
00000000000e 000300000013 R_390_PC32DBL 0000000000000000 .data + 2
00000000001c 001000000013 R_390_PC32DBL 0000000000000000 sha256_starts + 2
000000000036 001100000013 R_390_PC32DBL 0000000000000000 sha256_update + 2
000000000048 001200000013 R_390_PC32DBL 0000000000000000 sha256_finish + 2
000000000052 000300000013 R_390_PC32DBL 0000000000000000 .data + 102
00000000005c 001300000013 R_390_PC32DBL 0000000000000000 memcmp + 2
...
00000000011a 001600000013 R_390_PC32DBL 0000000000000000 setup_arch + 2
000000000120 000300000013 R_390_PC32DBL 0000000000000000 .data + 122
000000000130 000f00000013 R_390_PC32DBL 0000000000000000 verify_sha256_digest + 2
000000000146 001700000013 R_390_PC32DBL 0000000000000000 post_verification[...] + 2
Corresponding s390 kernel discussion:
* https://lore.kernel.org/linux-s390/20211208105801.188140-1-egorenar@linux.ibm.com/T/#u
Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Reported-by: Tao Liu <ltao@redhat.com>
Suggested-by: Philipp Rudo <prudo@redhat.com>
Reviewed-by: Philipp Rudo <prudo@redhat.com>
[hca@linux.ibm.com: changed commit message as requested by Philipp Rudo]
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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kexec-tools commit 61b8c79b0fb7 ("arm64/crashdump-arm64: deduce the
paddr of _text") tries to deduce the paddr of _text, but turns out
partially.
That commit is based on "The Image must be placed text_offset bytes from
a 2MB aligned base address anywhere in usable system RAM and called
there" in linux/Documentation/arm64/booting.rst, plus text_offset field
is zero.
But in practice, some boot loaders does not obey the convention, and
still boots up the kernel successfully.
Revisiting kernel commit e2a073dde921 ("arm64: omit [_text, _stext) from
permanent kernel mapping"), the kernel code size changes from (unsigned
long)__init_begin - (unsigned long)_text to (unsigned long)__init_begin
- (unsigned long)_stext
And it should be a better factor to decide which label starts the
"Kernel code" in /proc/iomem.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Add .git to version so it doesn't look like a release.
This is just so when people build code from git it can
be identified as such from the version string.
Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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Pass the following properties to the crash dump kernel, to provide a
modern DT interface between kexec and the crash dump kernel:
- linux,elfcorehdr: ELF core header segment, similar to the
"elfcorehdr=" kernel parameter.
- linux,usable-memory-range: Usable memory reserved for the crash dump
kernel.
This makes the memory reservation explicit, so Linux no longer needs
to mask the program counter, and rely on the "mem=" kernel parameter
to obtain the start and size of usable memory.
For backwards compatibility, the "elfcorehdr=" and "mem=" kernel
parameters are still appended to the kernel command line.
Loosely based on the ARM64 version by Akashi Takahiro.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms@verge.net.au>
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mem_lower and mem_upper are measured in kilobytes.
Signed-off-by: Simon Horman <horms@verge.net.au>
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free should be called before the function exit abnormally.
Signed-off-by: Kai Song <songkai01@inspur.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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fclose should be called before function exits
Signed-off-by: Kai Song <songkai01@inspur.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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When the function exits abnormally,ph should be freed.
Signed-off-by: Kai Song <songkai01@inspur.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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In get_kernel_page_offset(),the local variable kv is unused,remove it.
Signed-off-by: Kai Song <songkai01@inspur.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Zhaofeng Li <hello@zhaofeng.li>
Signed-off-by: Simon Horman <horms@verge.net.au>
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In some cases, add_buffer will actually try to allocate the buffer
at 0x0, which may not be acceptable by some kernels. Let's avoid
the first 0x500 bytes so we don't screw up the IVT and BDA.
Signed-off-by: Zhaofeng Li <hello@zhaofeng.li>
Signed-off-by: Simon Horman <horms@verge.net.au>
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This would segfault if mhi.rel_tag didn't exist.
Signed-off-by: Zhaofeng Li <hello@zhaofeng.li>
Signed-off-by: Simon Horman <horms@verge.net.au>
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tag_load_base_addr is dependent on rel_tag, and tag_framebuffer was
not accounted for.
Signed-off-by: Zhaofeng Li <hello@zhaofeng.li>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Zhaofeng Li <hello@zhaofeng.li>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Replace hardcoded FDT structure block tokens with proper names to
improve code readability.
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Since kernel commit e2a073dde921 ("arm64: omit [_text, _stext) from
permanent kernel mapping"), the physical address of 'Kernel code' in
/proc/iomem is mapped from _text, instead, from _stext.
Taking the compatibility into account, it had better deduce the paddr of
_text despite of the unavailability through /proc/iomem. It can be
achieved by utilizing the fact _text aligned on 2MB.
Signed-off-by: Pingfan Liu <piliu@redhat.com>
Cc: Simon Horman <horms@verge.net.au>
To: kexec@lists.infradead.org
Signed-off-by: Simon Horman <horms@verge.net.au>
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The ramdisk variable is defined in kexec/arch/ppc/kexec-ppc.c. This
other definition is not needed and breaks build with -fno-common.
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Add .git to version so it doesn't look like a release.
This is just so when people build code from git it can
be identified as such from the version string.
Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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If the passed zImage happens to have a DTB appended, then the magic 4 bytes
of the DTB are copied together with the kernel image. This leads to
failed kexec boots because the decompressor finds the aforementioned
DTB magic and falsely tries to replace the DTB passed in the register r2
with the non-existent appended one.
Signed-off-by: Alexander Egorenkov <egorenar-dev@posteo.net>
Signed-off-by: Simon Horman <horms@verge.net.au>
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During kexec there are two kernel versions at play. The version of
the running kernel and the version of the kernel that will be booted.
On powerpc it appears people have been using the version of the
running kernel to attempt to detect properties of the kernel to be
booted which is just wrong. As the linux kernel version that is being
detected is a no longer supported kernel just remove that buggy and
confused code.
On x86_64 the kernel_version is used to compute the starting virtual
address of the running kernel so a proper core dump may be generated.
Using the kernel_version stopped working a while ago when the starting
virtual address became randomized.
The old code was kept for the case where the kernel was not built with
randomization support, but there is nothing in reading /proc/kcore
that won't work to detect the starting virtual address even there.
In fact /proc/kcore must have the starting virtual address or a
debugger can not make sense of the running kernel.
So just make computing the starting virtual address on x86_64
unconditional. With a hard coded fallback just in case something went
wrong.
Doing something with kernel_version() has become important as recent
stable kernels have seen the minor version to > 255. Just removing
kernel_version() looks like the best option.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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We risk throwing an entire large chunk away if it is just slightly
unaligned which then causes the crash kernel to run out of RAM. Keep
them and shrink them to alignment.
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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The real mode ends at 0x400, not 0x100. The code intentionally excludes
the IVT as RAM, so use the correct address.
Also, 0x100 is not 1K aligned and will be rejected by add_memmap(). We
have observed problems that after a multiboot2 kexec, the next kexec
will throw away such unaligned chunks, losing memory for the next next
kernel. In some corner cases, such loss of memory can actually cause OOM
during boot.
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Initial github workflow which builds kexec on a range of architectures.
Signed-off-by: Simon Horman <horms@verge.net.au>
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Add distcheck target which aims to exercise build, install and uninstall
using distribution tarball.
Signed-off-by: Simon Horman <horms@verge.net.au>
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This appears to have been copied from some generated code.
Simplify it by rolling repetitive operations into a for loop.
Signed-off-by: Simon Horman <horms@verge.net.au>
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For symmetry with the install target, also use DESTDIR in the uninstall
target.
Signed-off-by: Simon Horman <horms@verge.net.au>
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kexec_test is installed but not uninstalled.
Correct this oversight.
Signed-off-by: Simon Horman <horms@verge.net.au>
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This provides a familiar alias for the existing tarball target.
The result is a tar.gz file.
Signed-off-by: Simon Horman <horms@verge.net.au>
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The current method of creating the tarball, which is to the hard-link
the source directory to the target directory, results in self-referential
hardlinks which can be observed using tar xf.
This patch resolves this by using an intermediate tarball, held in memory,
which collects files to be distributed. This is then unpacked in the target
directory which is finally packed into the distribution tarball, a file.
Signed-off-by: Simon Horman <horms@verge.net.au>
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virtio-mem in Linux adds/removes individual memory blocks (e.g., 128 MB
each). Linux merges adjacent memory blocks added by virtio-mem devices, but
we can still end up with a very sparse memory layout when unplugging
memory in corner cases.
Let's increase the maximum number of crash memory ranges from ~2k to 32k.
32k should be sufficient for a very long time.
e_phnum field in the header is 16 bits wide, so we can fit a maximum of
~64k entries in there, shared with other entries (i.e., CPU). Therefore,
using up to 32k memory ranges is fine. (if we ever need more than ~64k,
we can switch to the sh_info field)
Move the temporary xen ranges off the stack, dynamically allocating
memory for them.
Note: We don't have to increase MAX_MEMORY_RANGES, because virtio-mem
added memory is driver managed and always detected and added by a
driver in the kexec'ed kernel; for ordinary kexec, we must not expose
these ranges in the firmware-provided memmap.
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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No need to iterate over empty entries.
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Traditionally, we had "System RAM" only on the top level of in the
kernel resource tree (-> /proc/iomem). Nowadays, we can also have
"System RAM" on lower levels of the tree -- driver-managed device memory
that is always detected and added via drivers. Current examples are
memory added via dax/kmem -- ("System RAM (kmem)") and virtio-mem ("System
RAM (virtio_mem)"). Note that in some kernel versions "System RAM
(kmem)" was exposed as "System RAM", but similarly, on lower levels of
the resource tree.
Let's add anything that contains "System RAM" to the elf core header, so
it will be dumped for kexec_load(). Handling kexec_file_load() in the
kernel is similarly getting fixed [1].
Loading a kdump kernel via "kexec -p -c" ... will result in the kdump
kernel to also dump dax/kmem and virtio-mem added System RAM now.
Note: We only want to dump this memory, we don't want to add this memory to
the memmap of an ordinary kexec'ed kernel ("fast system reboot").
[1] https://lkml.kernel.org/r/20210322160200.19633-1-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Unlike xen_kexec_load(), xen_kexec_unload() and xen_kexec_status()
fail to distinguish between normal kexec and Xen Live Update image
types.
Fix that by introducing a new helper function that maps internal
flags to KEXEC_TYPE_*, and using it throughout kexec-xen.c.
Signed-off-by: Raphael Ning <raphning@amazon.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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According to kexec(8) manpage, --status (-S) works with both
normal kexec (loaded by -l) and crash kernel (loaded by -p) image
types, and defaults to the latter. However, the implementation does
not match the description: `kexec -l -S` queries the -p image type
as if -l were not specified. This is because there is no internal
flag defined for the normal kexec type, and -S treats the zero flag
as the trigger for the default behaviour (-p).
Fix that by making sure the default behaviour for -S is not applied
when the -l option is present.
Signed-off-by: Raphael Ning <raphning@amazon.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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On both Linux and Xen, an exit code of 0 from `kexec --status`
indicates that the kexec image being queried is NOT loaded, which
is contrary to what the man page and usage() say.
Signed-off-by: Raphael Ning <raphning@amazon.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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When compiling for 32-bit:
util_lib/elf_info.c: In function ‘dump_dmesg_lockless’:
util_lib/elf_info.c:1095:39: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
1095 | fprintf(stderr, "Failed to malloc %lu bytes for prb: %s\n",
| ~~^
| |
| long unsigned int
| %u
1096 | printk_ringbuffer_sz, strerror(errno));
| ~~~~~~~~~~~~~~~~~~~~
| |
| size_t {aka unsigned int}
util_lib/elf_info.c:1101:49: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
1101 | fprintf(stderr, "Failed to read prb of size %lu bytes: %s\n",
| ~~^
| |
| long unsigned int
| %u
1102 | printk_ringbuffer_sz, strerror(errno));
| ~~~~~~~~~~~~~~~~~~~~
| |
| size_t {aka unsigned int}
Indeed, "size_t" is "unsigned int" on 32-bit platforms, and "unsigned
long" on 64-bit platforms.
Fix this by formatting using "%zu".
Fixes: 4149df9005f2cdd2 ("printk: add support for lockless ringbuffer")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Simon Horman <horms@verge.net.au>
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When compiling for 32-bit:
util_lib/elf_info.c: In function ‘get_desc_state’:
util_lib/elf_info.c:923:31: warning: left shift count >= width of type [-Wshift-count-overflow]
923 | #define DESC_FLAGS_MASK (3UL << DESC_FLAGS_SHIFT)
| ^~
util_lib/elf_info.c:925:25: note: in expansion of macro ‘DESC_FLAGS_MASK’
925 | #define DESC_ID_MASK (~DESC_FLAGS_MASK)
| ^~~~~~~~~~~~~~~
util_lib/elf_info.c:926:30: note: in expansion of macro ‘DESC_ID_MASK’
926 | #define DESC_ID(sv) ((sv) & DESC_ID_MASK)
| ^~~~~~~~~~~~
util_lib/elf_info.c:947:12: note: in expansion of macro ‘DESC_ID’
947 | if (id != DESC_ID(state_val))
| ^~~~~~~
util_lib/elf_info.c: In function ‘id_inc’:
util_lib/elf_info.c:923:31: warning: left shift count >= width of type [-Wshift-count-overflow]
923 | #define DESC_FLAGS_MASK (3UL << DESC_FLAGS_SHIFT)
| ^~
util_lib/elf_info.c:925:25: note: in expansion of macro ‘DESC_FLAGS_MASK’
925 | #define DESC_ID_MASK (~DESC_FLAGS_MASK)
| ^~~~~~~~~~~~~~~
util_lib/elf_info.c:981:15: note: in expansion of macro ‘DESC_ID_MASK’
981 | return (id & DESC_ID_MASK);
| ^~~~~~~~~~~~
Indeed, "unsigned long" constants are 32-bit on 32-bit platforms, and
64-bit on 64-bit platforms.
Fix this by using a "ULL" suffix instead.
Fixes: 4149df9005f2cdd2 ("printk: add support for lockless ringbuffer")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Simon Horman <horms@verge.net.au>
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When compiling for 32-bit:
kexec/kexec.c: In function ‘cmdline_add_liveupdate’:
kexec/kexec.c:1192:30: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘uint64_t’ {aka ‘long long unsigned int’} [-Wformat=]
1192 | sprintf(buf, " liveupdate=%luM@0x%lx", lu_sizeM, lu_start);
| ~~^ ~~~~~~~~
| | |
| | uint64_t {aka long long unsigned int}
| long unsigned int
| %llu
kexec/kexec.c:1192:37: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘uint64_t’ {aka ‘long long unsigned int’} [-Wformat=]
1192 | sprintf(buf, " liveupdate=%luM@0x%lx", lu_sizeM, lu_start);
| ~~^ ~~~~~~~~
| | |
| | uint64_t {aka long long unsigned int}
| long unsigned int
| %llx
Indeed, "uint64_t" is "unsigned long long" on 32-bit formats, and
"unsigned long" on 64-bit formats.
Fix this by casting to "unsigned long long", and formatting using "%llu"
or "%llx".
Fixes: b13984c6f9ec7fdd ("kexec: Introduce --load-live-update for xen")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms@verge.net.au>
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The added "mem=size@start" parameter actually corresponds to
"crashkernel=YM@XM", but 1 byte is missing when calculating
the size, so 1 byte should be added.
For example, when using crashkernel=108M@64M (110592K@65536K):
Without this patch:
the mem parameter added is: mem=110591K@65536K
With this patch:
the mem parameter added is: mem=110592K@65536K
Fixes: 0eac64052636 ("kexec: mips: Fix mem parameters")
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Simon Horman <horms@verge.net.au>
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kexec build will fail on older kernels (pre 4.4) as the define
VIDEO_CAPABILITY_64BIT_BASE was not present at that time.
This patch adds it, as per linux/include/uapi/linux/screen_info.h,
if not present.
Signed-off-by: Federico Pellegrin <fede@evolware.org>
Reviewed-by: Kairui Song <kasong@redhat.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Fix typo in comment.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Simon Horman <horms@verge.net.au>
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This patch adds an option "--reuse-cmdline" for people that are lazy
in typing --append="$(cat /proc/cmdline)", which will directly use the
command line of the currently running system.
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Simon Horman <horms@verge.net.au>
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Add .git to version so it doesn't look like a release.
This is just so when people build code from git it can
be identified as such from the version string.
Signed-off-by: Simon Horman <horms@verge.net.au>
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