kexec: implementation of new syscall kexec_file_load

[deliverable/linux.git] / arch / x86 / kernel / machine_kexec_64.c

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 679cef0791cd842448216f4a6158cd2ae24fe0e0..c8875b5545e1e5bfe307a3cec8a986c8de6c0431 100644 (file)
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -22,6 +22,10 @@
 #include <asm/mmu_context.h>
 #include <asm/debugreg.h>
 
+static struct kexec_file_ops *kexec_file_loaders[] = {
+               NULL,
+};
+
 static void free_transition_pgtable(struct kimage *image)
 {
        free_page((unsigned long)image->arch.pud);
@@ -283,3 +287,44 @@ void arch_crash_save_vmcoreinfo(void)
                              (unsigned long)&_text - __START_KERNEL);
 }
 
+/* arch-dependent functionality related to kexec file-based syscall */
+
+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)
+{
+       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);
+}