The patch titled
Subject: kexec_file: do not add extra alignment to efi memmap
has been added to the -mm tree. Its filename is
kexec_file-do-not-add-extra-alignment-to-efi-memmap.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kexec_file-do-not-add-extra-alignment-to-efi-memmap.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kexec_file-do-not-add-extra-alignment-to-efi-memmap.patch
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------------------------------------------------------
From: Dave Young <dyoung@xxxxxxxxxx>
Subject: kexec_file: do not add extra alignment to efi memmap
Chun-Yi reported a kernel warning message below:
WARNING: CPU: 0 PID: 0 at ../mm/early_ioremap.c:182 early_iounmap+0x4f/0x12c()
early_iounmap(ffffffffff200180, 00000118) [0] size not consistent 00000120
The problem is x86 kexec_file_load adds extra alignment to the efi memmap:
in bzImage64_load():
efi_map_sz = efi_get_runtime_map_size();
efi_map_sz = ALIGN(efi_map_sz, 16);
And __efi_memmap_init maps with the size including the alignment bytes but
efi_memmap_unmap use nr_maps * desc_size which does not include the extra
bytes.
The alignment in kexec code is only needed for the kexec buffer internal
use Actually kexec should pass exact size of the efi memmap to 2nd kernel.
Link: http://lkml.kernel.org/r/20180417083600.GA1972@xxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Dave Young <dyoung@xxxxxxxxxx>
Reported-by: joeyli <jlee@xxxxxxxx>
Tested-by: Randy Wright <rwright@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/kexec-bzimage64.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff -puN arch/x86/kernel/kexec-bzimage64.c~kexec_file-do-not-add-extra-alignment-to-efi-memmap arch/x86/kernel/kexec-bzimage64.c
--- a/arch/x86/kernel/kexec-bzimage64.c~kexec_file-do-not-add-extra-alignment-to-efi-memmap
+++ a/arch/x86/kernel/kexec-bzimage64.c
@@ -398,11 +398,10 @@ static void *bzImage64_load(struct kimag
* little bit simple
*/
efi_map_sz = efi_get_runtime_map_size();
- efi_map_sz = ALIGN(efi_map_sz, 16);
params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
MAX_ELFCOREHDR_STR_LEN;
params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
- kbuf.bufsz = params_cmdline_sz + efi_map_sz +
+ kbuf.bufsz = params_cmdline_sz + ALIGN(efi_map_sz, 16) +
sizeof(struct setup_data) +
sizeof(struct efi_setup_data);
@@ -410,7 +409,7 @@ static void *bzImage64_load(struct kimag
if (!params)
return ERR_PTR(-ENOMEM);
efi_map_offset = params_cmdline_sz;
- efi_setup_data_offset = efi_map_offset + efi_map_sz;
+ efi_setup_data_offset = efi_map_offset + ALIGN(efi_map_sz, 16);
/* Copy setup header onto bootparams. Documentation/x86/boot.txt */
setup_header_size = 0x0202 + kernel[0x0201] - setup_hdr_offset;
_
Patches currently in -mm which might be from dyoung@xxxxxxxxxx are
kexec_file-do-not-add-extra-alignment-to-efi-memmap.patch
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