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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);

8
include/linux/kexec.h
View File

@ -163,7 +163,7 @@ struct kexec_file_ops {
*/
struct kexec_buf {
struct kimage *image;
char *buffer;
void *buffer;
unsigned long bufsz;
unsigned long mem;
unsigned long memsz;
@ -175,6 +175,7 @@ struct kexec_buf {
int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
int (*func)(u64, u64, void *));
extern int kexec_add_buffer(struct kexec_buf *kbuf);
#endif /* CONFIG_KEXEC_FILE */
struct kimage {
@ -239,11 +240,6 @@ extern asmlinkage long sys_kexec_load(unsigned long entry,
struct kexec_segment __user *segments,
unsigned long flags);
extern int kernel_kexec(void);
extern int kexec_add_buffer(struct kimage *image, char *buffer,
unsigned long bufsz, unsigned long memsz,
unsigned long buf_align, unsigned long buf_min,
unsigned long buf_max, bool top_down,
unsigned long *load_addr);
extern struct page *kimage_alloc_control_pages(struct kimage *image,
unsigned int order);
extern int kexec_load_purgatory(struct kimage *image, unsigned long min,

88
kernel/kexec_file.c
View File

@ -449,25 +449,27 @@ int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf,
return walk_system_ram_res(0, ULONG_MAX, kbuf, func);
}
/*
* Helper function for placing a buffer in a kexec segment. This assumes
* that kexec_mutex is held.
/**
* kexec_add_buffer - place a buffer in a kexec segment
* @kbuf: Buffer contents and memory parameters.
*
* This function assumes that kexec_mutex is held.
* On successful return, @kbuf->mem will have the physical address of
* the buffer in memory.
*
* Return: 0 on success, negative errno on error.
*/
int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
unsigned long memsz, unsigned long buf_align,
unsigned long buf_min, unsigned long buf_max,
bool top_down, unsigned long *load_addr)
int kexec_add_buffer(struct kexec_buf *kbuf)
{
struct kexec_segment *ksegment;
struct kexec_buf buf, *kbuf;
int ret;
/* Currently adding segment this way is allowed only in file mode */
if (!image->file_mode)
if (!kbuf->image->file_mode)
return -EINVAL;
if (image->nr_segments >= KEXEC_SEGMENT_MAX)
if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX)
return -EINVAL;
/*
@ -477,22 +479,14 @@ int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
* logic goes through list of segments to make sure there are
* no destination overlaps.
*/
if (!list_empty(&image->control_pages)) {
if (!list_empty(&kbuf->image->control_pages)) {
WARN_ON(1);
return -EINVAL;
}
memset(&buf, 0, sizeof(struct kexec_buf));
kbuf = &buf;
kbuf->image = image;
kbuf->buffer = buffer;
kbuf->bufsz = bufsz;
kbuf->memsz = ALIGN(memsz, PAGE_SIZE);
kbuf->buf_align = max(buf_align, PAGE_SIZE);
kbuf->buf_min = buf_min;
kbuf->buf_max = buf_max;
kbuf->top_down = top_down;
/* Ensure minimum alignment needed for segments. */
kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
/* Walk the RAM ranges and allocate a suitable range for the buffer */
ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback);
@ -502,13 +496,12 @@ int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
}
/* Found a suitable memory range */
ksegment = &image->segment[image->nr_segments];
ksegment = &kbuf->image->segment[kbuf->image->nr_segments];
ksegment->kbuf = kbuf->buffer;
ksegment->bufsz = kbuf->bufsz;
ksegment->mem = kbuf->mem;
ksegment->memsz = kbuf->memsz;
image->nr_segments++;
*load_addr = ksegment->mem;
kbuf->image->nr_segments++;
return 0;
}
@ -630,13 +623,15 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
unsigned long max, int top_down)
{
struct purgatory_info *pi = &image->purgatory_info;
unsigned long align, buf_align, bss_align, buf_sz, bss_sz, bss_pad;
unsigned long memsz, entry, load_addr, curr_load_addr, bss_addr, offset;
unsigned long align, bss_align, bss_sz, bss_pad;
unsigned long entry, load_addr, curr_load_addr, bss_addr, offset;
unsigned char *buf_addr, *src;
int i, ret = 0, entry_sidx = -1;
const Elf_Shdr *sechdrs_c;
Elf_Shdr *sechdrs = NULL;
void *purgatory_buf = NULL;
struct kexec_buf kbuf = { .image = image, .bufsz = 0, .buf_align = 1,
.buf_min = min, .buf_max = max,
.top_down = top_down };
/*
* sechdrs_c points to section headers in purgatory and are read
@ -702,9 +697,7 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
}
/* Determine how much memory is needed to load relocatable object. */
buf_align = 1;
bss_align = 1;
buf_sz = 0;
bss_sz = 0;
for (i = 0; i < pi->ehdr->e_shnum; i++) {
@ -713,10 +706,10 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
align = sechdrs[i].sh_addralign;
if (sechdrs[i].sh_type != SHT_NOBITS) {
if (buf_align < align)
buf_align = align;
buf_sz = ALIGN(buf_sz, align);
buf_sz += sechdrs[i].sh_size;
if (kbuf.buf_align < align)
kbuf.buf_align = align;
kbuf.bufsz = ALIGN(kbuf.bufsz, align);
kbuf.bufsz += sechdrs[i].sh_size;
} else {
/* bss section */
if (bss_align < align)
@ -728,32 +721,31 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
/* Determine the bss padding required to align bss properly */
bss_pad = 0;
if (buf_sz & (bss_align - 1))
bss_pad = bss_align - (buf_sz & (bss_align - 1));
if (kbuf.bufsz & (bss_align - 1))
bss_pad = bss_align - (kbuf.bufsz & (bss_align - 1));
memsz = buf_sz + bss_pad + bss_sz;
kbuf.memsz = kbuf.bufsz + bss_pad + bss_sz;
/* Allocate buffer for purgatory */
purgatory_buf = vzalloc(buf_sz);
if (!purgatory_buf) {
kbuf.buffer = vzalloc(kbuf.bufsz);
if (!kbuf.buffer) {
ret = -ENOMEM;
goto out;
}
if (buf_align < bss_align)
buf_align = bss_align;
if (kbuf.buf_align < bss_align)
kbuf.buf_align = bss_align;
/* Add buffer to segment list */
ret = kexec_add_buffer(image, purgatory_buf, buf_sz, memsz,
buf_align, min, max, top_down,
&pi->purgatory_load_addr);
ret = kexec_add_buffer(&kbuf);
if (ret)
goto out;
pi->purgatory_load_addr = kbuf.mem;
/* Load SHF_ALLOC sections */
buf_addr = purgatory_buf;
buf_addr = kbuf.buffer;
load_addr = curr_load_addr = pi->purgatory_load_addr;
bss_addr = load_addr + buf_sz + bss_pad;
bss_addr = load_addr + kbuf.bufsz + bss_pad;
for (i = 0; i < pi->ehdr->e_shnum; i++) {
if (!(sechdrs[i].sh_flags & SHF_ALLOC))
@ -799,11 +791,11 @@ static int __kexec_load_purgatory(struct kimage *image, unsigned long min,
* Used later to identify which section is purgatory and skip it
* from checksumming.
*/
pi->purgatory_buf = purgatory_buf;
pi->purgatory_buf = kbuf.buffer;
return ret;
out:
vfree(sechdrs);
vfree(purgatory_buf);
vfree(kbuf.buffer);
return ret;
}