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kexec_file: Change kexec_add_buffer to take kexec_buf as argument.

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This is done to simplify the kexec_add_buffer argument list.
Adapt all callers to set up a kexec_buf to pass to kexec_add_buffer.

In addition, change the type of kexec_buf.buffer from char * to void *.
There is no particular reason for it to be a char *, and the change
allows us to get rid of 3 existing casts to char * in the code.

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Dave Young <dyoung@redhat.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Thiago Jung Bauermann
2016-11-29 23:45:48 +11:00
committed by Michael Ellerman
parent 60fe3910bb
commit ec2b9bfaac
4 changed files with 87 additions and 94 deletions
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37
arch/x86/kernel/crash.c
View File

@@ -631,9 +631,9 @@ static int determine_backup_region(u64 start, u64 end, void *arg)
int crash_load_segments(struct kimage *image)
{
unsigned long src_start, src_sz, elf_sz;
void *elf_addr;
int ret;
struct kexec_buf kbuf = { .image = image, .buf_min = 0,
.buf_max = ULONG_MAX, .top_down = false };
/*
* Determine and load a segment for backup area. First 640K RAM
@@ -647,43 +647,44 @@ int crash_load_segments(struct kimage *image)
if (ret < 0)
return ret;
src_start = image->arch.backup_src_start;
src_sz = image->arch.backup_src_sz;
/* Add backup segment. */
if (src_sz) {
if (image->arch.backup_src_sz) {
kbuf.buffer = &crash_zero_bytes;
kbuf.bufsz = sizeof(crash_zero_bytes);
kbuf.memsz = image->arch.backup_src_sz;
kbuf.buf_align = PAGE_SIZE;
/*
* Ideally there is no source for backup segment. This is
* copied in purgatory after crash. Just add a zero filled
* segment for now to make sure checksum logic works fine.
*/
ret = kexec_add_buffer(image, (char *)&crash_zero_bytes,
sizeof(crash_zero_bytes), src_sz,
PAGE_SIZE, 0, -1, 0,
&image->arch.backup_load_addr);
ret = kexec_add_buffer(&kbuf);
if (ret)
return ret;
image->arch.backup_load_addr = kbuf.mem;
pr_debug("Loaded backup region at 0x%lx backup_start=0x%lx memsz=0x%lx\n",
image->arch.backup_load_addr, src_start, src_sz);
image->arch.backup_load_addr,
image->arch.backup_src_start, kbuf.memsz);
}
/* Prepare elf headers and add a segment */
ret = prepare_elf_headers(image, &elf_addr, &elf_sz);
ret = prepare_elf_headers(image, &kbuf.buffer, &kbuf.bufsz);
if (ret)
return ret;
image->arch.elf_headers = elf_addr;
image->arch.elf_headers_sz = elf_sz;
image->arch.elf_headers = kbuf.buffer;
image->arch.elf_headers_sz = kbuf.bufsz;
ret = kexec_add_buffer(image, (char *)elf_addr, elf_sz, elf_sz,
ELF_CORE_HEADER_ALIGN, 0, -1, 0,
&image->arch.elf_load_addr);
kbuf.memsz = kbuf.bufsz;
kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
ret = kexec_add_buffer(&kbuf);
if (ret) {
vfree((void *)image->arch.elf_headers);
return ret;
}
image->arch.elf_load_addr = kbuf.mem;
pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
image->arch.elf_load_addr, elf_sz, elf_sz);
image->arch.elf_load_addr, kbuf.bufsz, kbuf.bufsz);
return ret;
}

48
arch/x86/kernel/kexec-bzimage64.c
View File

@@ -331,17 +331,17 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
struct setup_header *header;
int setup_sects, kern16_size, ret = 0;
unsigned long setup_header_size, params_cmdline_sz, params_misc_sz;
unsigned long setup_header_size, params_cmdline_sz;
struct boot_params *params;
unsigned long bootparam_load_addr, kernel_load_addr, initrd_load_addr;
unsigned long purgatory_load_addr;
unsigned long kernel_bufsz, kernel_memsz, kernel_align;
char *kernel_buf;
struct bzimage64_data *ldata;
struct kexec_entry64_regs regs64;
void *stack;
unsigned int setup_hdr_offset = offsetof(struct boot_params, hdr);
unsigned int efi_map_offset, efi_map_sz, efi_setup_data_offset;
struct kexec_buf kbuf = { .image = image, .buf_max = ULONG_MAX,
.top_down = true };
header = (struct setup_header *)(kernel + setup_hdr_offset);
setup_sects = header->setup_sects;
@@ -402,11 +402,11 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
params_cmdline_sz = sizeof(struct boot_params) + cmdline_len +
MAX_ELFCOREHDR_STR_LEN;
params_cmdline_sz = ALIGN(params_cmdline_sz, 16);
params_misc_sz = params_cmdline_sz + efi_map_sz +
kbuf.bufsz = params_cmdline_sz + efi_map_sz +
sizeof(struct setup_data) +
sizeof(struct efi_setup_data);
params = kzalloc(params_misc_sz, GFP_KERNEL);
params = kzalloc(kbuf.bufsz, GFP_KERNEL);
if (!params)
return ERR_PTR(-ENOMEM);
efi_map_offset = params_cmdline_sz;
@@ -418,37 +418,41 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
/* Is there a limit on setup header size? */
memcpy(&params->hdr, (kernel + setup_hdr_offset), setup_header_size);
ret = kexec_add_buffer(image, (char *)params, params_misc_sz,
params_misc_sz, 16, MIN_BOOTPARAM_ADDR,
ULONG_MAX, 1, &bootparam_load_addr);
kbuf.buffer = params;
kbuf.memsz = kbuf.bufsz;
kbuf.buf_align = 16;
kbuf.buf_min = MIN_BOOTPARAM_ADDR;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out_free_params;
bootparam_load_addr = kbuf.mem;
pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
bootparam_load_addr, params_misc_sz, params_misc_sz);
bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
/* Load kernel */
kernel_buf = kernel + kern16_size;
kernel_bufsz = kernel_len - kern16_size;
kernel_memsz = PAGE_ALIGN(header->init_size);
kernel_align = header->kernel_alignment;
ret = kexec_add_buffer(image, kernel_buf,
kernel_bufsz, kernel_memsz, kernel_align,
MIN_KERNEL_LOAD_ADDR, ULONG_MAX, 1,
&kernel_load_addr);
kbuf.buffer = kernel + kern16_size;
kbuf.bufsz = kernel_len - kern16_size;
kbuf.memsz = PAGE_ALIGN(header->init_size);
kbuf.buf_align = header->kernel_alignment;
kbuf.buf_min = MIN_KERNEL_LOAD_ADDR;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out_free_params;
kernel_load_addr = kbuf.mem;
pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
kernel_load_addr, kernel_memsz, kernel_memsz);
kernel_load_addr, kbuf.bufsz, kbuf.memsz);
/* Load initrd high */
if (initrd) {
ret = kexec_add_buffer(image, initrd, initrd_len, initrd_len,
PAGE_SIZE, MIN_INITRD_LOAD_ADDR,
ULONG_MAX, 1, &initrd_load_addr);
kbuf.buffer = initrd;
kbuf.bufsz = kbuf.memsz = initrd_len;
kbuf.buf_align = PAGE_SIZE;
kbuf.buf_min = MIN_INITRD_LOAD_ADDR;
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out_free_params;
initrd_load_addr = kbuf.mem;
pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
initrd_load_addr, initrd_len, initrd_len);