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authorPhilipp Rudo <prudo@linux.vnet.ibm.com>2018-04-13 15:36:43 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-13 17:10:28 -0700
commit3be3f61d25e04ecf90d65d52fad632af5ba8805b (patch)
treee74b43ccd63d1d063f01281903b7639d226f3bf1
parent8da0b724959ccd3f8435214ebdaf1aef548967bb (diff)
downloadlinux-stericsson-3be3f61d25e04ecf90d65d52fad632af5ba8805b.tar.gz
kernel/kexec_file.c: allow archs to set purgatory load address
For s390 new kernels are loaded to fixed addresses in memory before they are booted. With the current code this is a problem as it assumes the kernel will be loaded to an 'arbitrary' address. In particular, kexec_locate_mem_hole searches for a large enough memory region and sets the load address (kexec_bufer->mem) to it. Luckily there is a simple workaround for this problem. By returning 1 in arch_kexec_walk_mem, kexec_locate_mem_hole is turned off. This allows the architecture to set kbuf->mem by hand. While the trick works fine for the kernel it does not for the purgatory as here the architectures don't have access to its kexec_buffer. Give architectures access to the purgatories kexec_buffer by changing kexec_load_purgatory to take a pointer to it. With this change architectures have access to the buffer and can edit it as they need. A nice side effect of this change is that we can get rid of the purgatory_info->purgatory_load_address field. As now the information stored there can directly be accessed from kbuf->mem. Link: http://lkml.kernel.org/r/20180321112751.22196-11-prudo@linux.vnet.ibm.com Signed-off-by: Philipp Rudo <prudo@linux.vnet.ibm.com> Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Dave Young <dyoung@redhat.com> Cc: AKASHI Takahiro <takahiro.akashi@linaro.org> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/powerpc/kernel/kexec_elf_64.c9
-rw-r--r--arch/x86/kernel/kexec-bzimage64.c8
-rw-r--r--include/linux/kexec.h17
-rw-r--r--kernel/kexec_file.c29
4 files changed, 31 insertions, 32 deletions
diff --git a/arch/powerpc/kernel/kexec_elf_64.c b/arch/powerpc/kernel/kexec_elf_64.c
index 6c78c11c7faf..ba4f18a43ee8 100644
--- a/arch/powerpc/kernel/kexec_elf_64.c
+++ b/arch/powerpc/kernel/kexec_elf_64.c
@@ -572,7 +572,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
{
int ret;
unsigned int fdt_size;
- unsigned long kernel_load_addr, purgatory_load_addr;
+ unsigned long kernel_load_addr;
unsigned long initrd_load_addr = 0, fdt_load_addr;
void *fdt;
const void *slave_code;
@@ -580,6 +580,8 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
struct elf_info elf_info;
struct kexec_buf kbuf = { .image = image, .buf_min = 0,
.buf_max = ppc64_rma_size };
+ struct kexec_buf pbuf = { .image = image, .buf_min = 0,
+ .buf_max = ppc64_rma_size, .top_down = true };
ret = build_elf_exec_info(kernel_buf, kernel_len, &ehdr, &elf_info);
if (ret)
@@ -591,14 +593,13 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
pr_debug("Loaded the kernel at 0x%lx\n", kernel_load_addr);
- ret = kexec_load_purgatory(image, 0, ppc64_rma_size, true,
- &purgatory_load_addr);
+ ret = kexec_load_purgatory(image, &pbuf);
if (ret) {
pr_err("Loading purgatory failed.\n");
goto out;
}
- pr_debug("Loaded purgatory at 0x%lx\n", purgatory_load_addr);
+ pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
if (initrd != NULL) {
kbuf.buffer = initrd;
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index 705654776c0c..3182908b7e6c 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -334,7 +334,6 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
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;
struct bzimage64_data *ldata;
struct kexec_entry64_regs regs64;
void *stack;
@@ -342,6 +341,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
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 };
+ struct kexec_buf pbuf = { .image = image, .buf_min = MIN_PURGATORY_ADDR,
+ .buf_max = ULONG_MAX, .top_down = true };
header = (struct setup_header *)(kernel + setup_hdr_offset);
setup_sects = header->setup_sects;
@@ -379,14 +380,13 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
* Load purgatory. For 64bit entry point, purgatory code can be
* anywhere.
*/
- ret = kexec_load_purgatory(image, MIN_PURGATORY_ADDR, ULONG_MAX, 1,
- &purgatory_load_addr);
+ ret = kexec_load_purgatory(image, &pbuf);
if (ret) {
pr_err("Loading purgatory failed\n");
return ERR_PTR(ret);
}
- pr_debug("Loaded purgatory at 0x%lx\n", purgatory_load_addr);
+ pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
/*
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 0e389b9b7722..9e4e638fb505 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -114,9 +114,6 @@ struct purgatory_info {
* relocation. This memory can be freed post image load.
*/
void *purgatory_buf;
-
- /* Address where purgatory is finally loaded and is executed from */
- unsigned long purgatory_load_addr;
};
struct kimage;
@@ -171,6 +168,12 @@ struct kexec_buf {
bool top_down;
};
+int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf);
+int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
+ void *buf, unsigned int size,
+ bool get_value);
+void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);
+
int __weak arch_kexec_apply_relocations_add(struct purgatory_info *pi,
Elf_Shdr *section,
const Elf_Shdr *relsec,
@@ -266,14 +269,6 @@ extern void machine_kexec_cleanup(struct kimage *image);
extern int kernel_kexec(void);
extern struct page *kimage_alloc_control_pages(struct kimage *image,
unsigned int order);
-extern int kexec_load_purgatory(struct kimage *image, unsigned long min,
- unsigned long max, int top_down,
- unsigned long *load_addr);
-extern int kexec_purgatory_get_set_symbol(struct kimage *image,
- const char *name, void *buf,
- unsigned int size, bool get_value);
-extern void *kexec_purgatory_get_symbol_addr(struct kimage *image,
- const char *name);
extern void __crash_kexec(struct pt_regs *);
extern void crash_kexec(struct pt_regs *);
int kexec_should_crash(struct task_struct *);
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 269116fd932c..75d8e7cf040e 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -730,8 +730,8 @@ static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi,
int i, ret;
sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
- bss_align = 1;
- bss_sz = 0;
+ kbuf->buf_align = bss_align = 1;
+ kbuf->bufsz = bss_sz = 0;
for (i = 0; i < pi->ehdr->e_shnum; i++) {
if (!(sechdrs[i].sh_flags & SHF_ALLOC))
@@ -763,7 +763,6 @@ static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi,
ret = kexec_add_buffer(kbuf);
if (ret)
goto out;
- pi->purgatory_load_addr = kbuf->mem;
return 0;
out:
@@ -901,27 +900,32 @@ static int kexec_apply_relocations(struct kimage *image)
return 0;
}
-/* Load relocatable purgatory object and relocate it appropriately */
-int kexec_load_purgatory(struct kimage *image, unsigned long min,
- unsigned long max, int top_down,
- unsigned long *load_addr)
+/*
+ * kexec_load_purgatory - Load and relocate the purgatory object.
+ * @image: Image to add the purgatory to.
+ * @kbuf: Memory parameters to use.
+ *
+ * Allocates the memory needed for image->purgatory_info.sechdrs and
+ * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible
+ * to free the memory after use.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf)
{
struct purgatory_info *pi = &image->purgatory_info;
int ret;
- struct kexec_buf kbuf = { .image = image, .bufsz = 0, .buf_align = 1,
- .buf_min = min, .buf_max = max,
- .top_down = top_down };
if (kexec_purgatory_size <= 0)
return -EINVAL;
pi->ehdr = (const Elf_Ehdr *)kexec_purgatory;
- ret = kexec_purgatory_setup_kbuf(pi, &kbuf);
+ ret = kexec_purgatory_setup_kbuf(pi, kbuf);
if (ret)
return ret;
- ret = kexec_purgatory_setup_sechdrs(pi, &kbuf);
+ ret = kexec_purgatory_setup_sechdrs(pi, kbuf);
if (ret)
goto out_free_kbuf;
@@ -929,7 +933,6 @@ int kexec_load_purgatory(struct kimage *image, unsigned long min,
if (ret)
goto out;
- *load_addr = pi->purgatory_load_addr;
return 0;
out:
vfree(pi->sechdrs);