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SubjectRe: [PATCH 5/5 V4] Help to dump the old memory encrypted into vmcore file
Hi Lianbo,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.18-rc2 next-20180628]
[cannot apply to tip/x86/core]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Lianbo-Jiang/Add-a-function-ioremap_encrypted-for-kdump-when-AMD-sme-enabled/20180628-173357
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.2.0 make.cross ARCH=arm64

All errors (new ones prefixed by >>):

fs/proc/vmcore.c: In function 'elfcorehdr_read':
>> fs/proc/vmcore.c:180:9: error: implicit declaration of function 'memremap'; did you mean 'memset_p'? [-Werror=implicit-function-declaration]
kbuf = memremap(offset, count, MEMREMAP_WB);
^~~~~~~~
memset_p
fs/proc/vmcore.c:180:33: error: 'MEMREMAP_WB' undeclared (first use in this function)
kbuf = memremap(offset, count, MEMREMAP_WB);
^~~~~~~~~~~
fs/proc/vmcore.c:180:33: note: each undeclared identifier is reported only once for each function it appears in
fs/proc/vmcore.c:185:2: error: implicit declaration of function 'memunmap'; did you mean 'vm_munmap'? [-Werror=implicit-function-declaration]
memunmap(kbuf);
^~~~~~~~
vm_munmap
cc1: some warnings being treated as errors

vim +180 fs/proc/vmcore.c

158
159 /*
160 * Architectures may override this function to read from ELF header.
161 * The kexec-tools will allocated the memory and build the elf header
162 * in the first kernel, subsequently, we will copy the data in the
163 * memory to the reserved crash memory. In kdump mode, we will read the
164 * elf header from the reserved crash memory, from this point of view,
165 * which is not an old memory, the original function called may mislead
166 * and do unnecessary things.
167 * For SME, it copies the elf header from the memory encrypted(user space)
168 * to the memory unencrypted(kernel space) when SME is activated in the
169 * first kernel, this operation just leads to decryption.
170 */
171 ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
172 {
173 char *kbuf;
174 resource_size_t offset;
175
176 if (!count)
177 return 0;
178
179 offset = (resource_size_t)*ppos;
> 180 kbuf = memremap(offset, count, MEMREMAP_WB);
181 if (!kbuf)
182 return 0;
183
184 memcpy(buf, kbuf, count);
185 memunmap(kbuf);
186
187 return count;
188 }
189

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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