From 7d84b82946dd733eaf9f8d89cc5bd1588f5e7a31 Mon Sep 17 00:00:00 2001 From: Vivek Goyal Date: Thu, 31 Jul 2014 09:38:02 +1000 Subject: kexec: implementation of new syscall kexec_file_load Previous patch provided the interface definition and this patch prvides implementation of new syscall. Previously segment list was prepared in user space. Now user space just passes kernel fd, initrd fd and command line and kernel will create a segment list internally. This patch contains generic part of the code. Actual segment preparation and loading is done by arch and image specific loader. Which comes in next patch. Signed-off-by: Vivek Goyal Cc: Borislav Petkov Cc: Michael Kerrisk Cc: Yinghai Lu Cc: Eric Biederman Cc: H. Peter Anvin Cc: Matthew Garrett Cc: Greg Kroah-Hartman Cc: Dave Young Cc: WANG Chao Cc: Baoquan He Cc: Andy Lutomirski Signed-off-by: Andrew Morton --- include/linux/kexec.h | 53 ++++++++++++++++++++++++++++++++++++++++++++++ include/uapi/linux/kexec.h | 11 ++++++++++ 2 files changed, 64 insertions(+) (limited to 'include') diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 66d56ac0f64c..8e80901e466f 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -121,13 +121,57 @@ struct kimage { #define KEXEC_TYPE_DEFAULT 0 #define KEXEC_TYPE_CRASH 1 unsigned int preserve_context : 1; + /* If set, we are using file mode kexec syscall */ + unsigned int file_mode:1; #ifdef ARCH_HAS_KIMAGE_ARCH struct kimage_arch arch; #endif + + /* Additional fields for file based kexec syscall */ + void *kernel_buf; + unsigned long kernel_buf_len; + + void *initrd_buf; + unsigned long initrd_buf_len; + + char *cmdline_buf; + unsigned long cmdline_buf_len; + + /* File operations provided by image loader */ + struct kexec_file_ops *fops; + + /* Image loader handling the kernel can store a pointer here */ + void *image_loader_data; }; +/* + * Keeps track of buffer parameters as provided by caller for requesting + * memory placement of buffer. + */ +struct kexec_buf { + 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; /* allocate from top of memory hole */ +}; +typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size); +typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf, + unsigned long kernel_len, char *initrd, + unsigned long initrd_len, char *cmdline, + unsigned long cmdline_len); +typedef int (kexec_cleanup_t)(struct kimage *image); + +struct kexec_file_ops { + kexec_probe_t *probe; + kexec_load_t *load; + kexec_cleanup_t *cleanup; +}; /* kexec interface functions */ extern void machine_kexec(struct kimage *image); @@ -138,6 +182,11 @@ 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 void crash_kexec(struct pt_regs *); @@ -188,6 +237,10 @@ extern int kexec_load_disabled; #define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT) #endif +/* List of defined/legal kexec file flags */ +#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \ + KEXEC_FILE_NO_INITRAMFS) + #define VMCOREINFO_BYTES (4096) #define VMCOREINFO_NOTE_NAME "VMCOREINFO" #define VMCOREINFO_NOTE_NAME_BYTES ALIGN(sizeof(VMCOREINFO_NOTE_NAME), 4) diff --git a/include/uapi/linux/kexec.h b/include/uapi/linux/kexec.h index d6629d49a243..6925f5b42f89 100644 --- a/include/uapi/linux/kexec.h +++ b/include/uapi/linux/kexec.h @@ -13,6 +13,17 @@ #define KEXEC_PRESERVE_CONTEXT 0x00000002 #define KEXEC_ARCH_MASK 0xffff0000 +/* + * Kexec file load interface flags. + * KEXEC_FILE_UNLOAD : Unload already loaded kexec/kdump image. + * KEXEC_FILE_ON_CRASH : Load/unload operation belongs to kdump image. + * KEXEC_FILE_NO_INITRAMFS : No initramfs is being loaded. Ignore the initrd + * fd field. + */ +#define KEXEC_FILE_UNLOAD 0x00000001 +#define KEXEC_FILE_ON_CRASH 0x00000002 +#define KEXEC_FILE_NO_INITRAMFS 0x00000004 + /* These values match the ELF architecture values. * Unless there is a good reason that should continue to be the case. */ -- cgit v1.2.3