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Subject[PATCH v3 03/10] kexec_file: factor out arch_kexec_kernel_*() from x86, powerpc
Date
arch_kexec_kernel_*() and arch_kimage_file_post_load_cleanup can now be
duplicated among some architectures, so let's factor them out.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/kexec.h | 4 ++
arch/powerpc/kernel/machine_kexec_file_64.c | 36 ++----------------
arch/x86/kernel/machine_kexec_64.c | 59 +----------------------------
include/linux/kexec.h | 26 ++++++++++---
kernel/kexec_file.c | 52 +++++++++++++++++++------
5 files changed, 70 insertions(+), 107 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 25668bc8cb2a..50810d24e38f 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -94,6 +94,10 @@ static inline bool kdump_in_progress(void)
#ifdef CONFIG_KEXEC_FILE
extern struct kexec_file_ops kexec_elf64_ops;

+#define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
+int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
+ unsigned long buf_len);
+
#ifdef CONFIG_IMA_KEXEC
#define ARCH_HAS_KIMAGE_ARCH

diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c
index 992c0d258e5d..5b7c4a3fbb50 100644
--- a/arch/powerpc/kernel/machine_kexec_file_64.c
+++ b/arch/powerpc/kernel/machine_kexec_file_64.c
@@ -31,8 +31,9 @@

#define SLAVE_CODE_SIZE 256

-static struct kexec_file_ops *kexec_file_loaders[] = {
+struct kexec_file_ops *kexec_file_loaders[] = {
&kexec_elf64_ops,
+ NULL
};

int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
@@ -45,38 +46,7 @@ int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
if (image->type == KEXEC_TYPE_CRASH)
return -ENOTSUPP;

- for (i = 0; i < ARRAY_SIZE(kexec_file_loaders); i++) {
- fops = kexec_file_loaders[i];
- if (!fops || !fops->probe)
- continue;
-
- ret = fops->probe(buf, buf_len);
- if (!ret) {
- image->fops = fops;
- return ret;
- }
- }
-
- return ret;
-}
-
-void *arch_kexec_kernel_image_load(struct kimage *image)
-{
- if (!image->fops || !image->fops->load)
- return ERR_PTR(-ENOEXEC);
-
- return image->fops->load(image, image->kernel_buf,
- image->kernel_buf_len, image->initrd_buf,
- image->initrd_buf_len, image->cmdline_buf,
- image->cmdline_buf_len);
-}
-
-int arch_kimage_file_post_load_cleanup(struct kimage *image)
-{
- if (!image->fops || !image->fops->cleanup)
- return 0;
-
- return image->fops->cleanup(image->image_loader_data);
+ return kexec_kernel_image_probe(image, buf, buf_len);
}

/**
diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index cb0a30473c23..f4df8315d001 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -30,8 +30,9 @@
#include <asm/set_memory.h>

#ifdef CONFIG_KEXEC_FILE
-static struct kexec_file_ops *kexec_file_loaders[] = {
+struct kexec_file_ops *kexec_file_loaders[] = {
&kexec_bzImage64_ops,
+ NULL
};
#endif

@@ -361,62 +362,6 @@ void arch_crash_save_vmcoreinfo(void)
/* arch-dependent functionality related to kexec file-based syscall */

#ifdef CONFIG_KEXEC_FILE
-int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
- unsigned long buf_len)
-{
- int i, ret = -ENOEXEC;
- struct kexec_file_ops *fops;
-
- for (i = 0; i < ARRAY_SIZE(kexec_file_loaders); i++) {
- fops = kexec_file_loaders[i];
- if (!fops || !fops->probe)
- continue;
-
- ret = fops->probe(buf, buf_len);
- if (!ret) {
- image->fops = fops;
- return ret;
- }
- }
-
- return ret;
-}
-
-void *arch_kexec_kernel_image_load(struct kimage *image)
-{
- vfree(image->arch.elf_headers);
- image->arch.elf_headers = NULL;
-
- if (!image->fops || !image->fops->load)
- return ERR_PTR(-ENOEXEC);
-
- return image->fops->load(image, image->kernel_buf,
- image->kernel_buf_len, image->initrd_buf,
- image->initrd_buf_len, image->cmdline_buf,
- image->cmdline_buf_len);
-}
-
-int arch_kimage_file_post_load_cleanup(struct kimage *image)
-{
- if (!image->fops || !image->fops->cleanup)
- return 0;
-
- return image->fops->cleanup(image->image_loader_data);
-}
-
-#ifdef CONFIG_KEXEC_VERIFY_SIG
-int arch_kexec_kernel_verify_sig(struct kimage *image, void *kernel,
- unsigned long kernel_len)
-{
- if (!image->fops || !image->fops->verify_sig) {
- pr_debug("kernel loader does not support signature verification.");
- return -EKEYREJECTED;
- }
-
- return image->fops->verify_sig(kernel, kernel_len);
-}
-#endif
-
/*
* Apply purgatory relocations.
*
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index dd056fab9e35..4a2b24d94e04 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -134,6 +134,26 @@ struct kexec_file_ops {
#endif
};

+int kexec_kernel_image_probe(struct kimage *image, void *buf,
+ unsigned long buf_len);
+void *kexec_kernel_image_load(struct kimage *image);
+int kexec_kernel_post_load_cleanup(struct kimage *image);
+int kexec_kernel_verify_sig(struct kimage *image, void *buf,
+ unsigned long buf_len);
+
+#ifndef arch_kexec_kernel_image_probe
+#define arch_kexec_kernel_image_probe kexec_kernel_image_probe
+#endif
+#ifndef arch_kexec_kernel_image_load
+#define arch_kexec_kernel_image_load kexec_kernel_image_load
+#endif
+#ifndef arch_kimage_file_post_load_cleanup
+#define arch_kimage_file_post_load_cleanup kexec_kernel_post_load_cleanup
+#endif
+#ifndef arch_kexec_kernel_verify_sig
+#define arch_kexec_kernel_verify_sig kexec_kernel_verify_sig
+#endif
+
/**
* struct kexec_buf - parameters for finding a place for a buffer in memory
* @image: kexec image in which memory to search.
@@ -276,12 +296,6 @@ int crash_shrink_memory(unsigned long new_size);
size_t crash_get_memory_size(void);
void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);

-int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
- unsigned long buf_len);
-void * __weak arch_kexec_kernel_image_load(struct kimage *image);
-int __weak arch_kimage_file_post_load_cleanup(struct kimage *image);
-int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
- unsigned long buf_len);
int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
Elf_Shdr *sechdrs, unsigned int relsec);
int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index 9f48f4412297..6203b54e04c5 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -26,30 +26,60 @@
#include <linux/vmalloc.h>
#include "kexec_internal.h"

+__weak struct kexec_file_ops *kexec_file_loaders[] = {NULL};
+
static int kexec_calculate_store_digests(struct kimage *image);

-/* Architectures can provide this probe function */
-int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
- unsigned long buf_len)
+int kexec_kernel_image_probe(struct kimage *image, void *buf,
+ unsigned long buf_len)
{
- return -ENOEXEC;
+ int i, ret = -ENOEXEC;
+ struct kexec_file_ops *fops;
+
+ for (i = 0; ; i++) {
+ fops = kexec_file_loaders[i];
+ if (!fops || !fops->probe)
+ break;
+
+ ret = fops->probe(buf, buf_len);
+ if (!ret) {
+ image->fops = fops;
+ return ret;
+ }
+ }
+
+ return ret;
}

-void * __weak arch_kexec_kernel_image_load(struct kimage *image)
+void *kexec_kernel_image_load(struct kimage *image)
{
- return ERR_PTR(-ENOEXEC);
+ if (!image->fops || !image->fops->load)
+ return ERR_PTR(-ENOEXEC);
+
+ return image->fops->load(image, image->kernel_buf,
+ image->kernel_buf_len, image->initrd_buf,
+ image->initrd_buf_len, image->cmdline_buf,
+ image->cmdline_buf_len);
}

-int __weak arch_kimage_file_post_load_cleanup(struct kimage *image)
+int kexec_kernel_post_load_cleanup(struct kimage *image)
{
- return -EINVAL;
+ if (!image->fops || !image->fops->cleanup)
+ return 0;
+
+ return image->fops->cleanup(image->image_loader_data);
}

#ifdef CONFIG_KEXEC_VERIFY_SIG
-int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
- unsigned long buf_len)
+int kexec_kernel_verify_sig(struct kimage *image, void *buf,
+ unsigned long buf_len)
{
- return -EKEYREJECTED;
+ if (!image->fops || !image->fops->verify_sig) {
+ pr_debug("kernel loader does not support signature verification.\n");
+ return -EKEYREJECTED;
+ }
+
+ return image->fops->verify_sig(buf, buf_len);
}
#endif

--
2.14.1
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