[PATCH 1/3] kexec: Introduce default_initrd_fd to pass internal initrd information

[Pingfan Liu]

At present, initrd information is passed through --initrd args, but for
the UKI case, the initrd may be stored in the .initrd section.

It means that initrd is perceived at the probe stage. And there should
be a way to carry this information forward to the load stage. In oder to
implement that, introducing a global default_initrd_fd to do it.

Signed-off-by: Pingfan Liu <piliu at redhat.com>
Cc: Simon Horman <horms at kernel.org>
Cc: Eric Biederman <ebiederm at xmission.com>
Cc: Baoquan He <bhe at redhat.com>
Cc: Dave Young <dyoung at redhat.com>
Cc: kexec at lists.infradead.org

---
 kexec/arch/arm64/kexec-image-arm64.c | 3 ++-
 kexec/arch/x86_64/kexec-bzImage64.c  | 3 ++-
 kexec/kexec.c                        | 2 ++
 kexec/kexec.h                        | 1 +
 4 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/kexec/arch/arm64/kexec-image-arm64.c b/kexec/arch/arm64/kexec-image-arm64.c
index a196747..188e7f6 100644
--- a/kexec/arch/arm64/kexec-image-arm64.c
+++ b/kexec/arch/arm64/kexec-image-arm64.c
@@ -50,7 +50,8 @@ int image_arm64_load(int argc, char **argv, const char *kernel_buf,
 				result = EFAILED;
 				goto exit;
 			}
-		}
+		} else if (default_initrd_fd != -1)
+			info->initrd_fd = default_initrd_fd;
 
 		if (arm64_opts.command_line) {
 			info->command_line = (char *)arm64_opts.command_line;
diff --git a/kexec/arch/x86_64/kexec-bzImage64.c b/kexec/arch/x86_64/kexec-bzImage64.c
index aba4e3b..e337dc0 100644
--- a/kexec/arch/x86_64/kexec-bzImage64.c
+++ b/kexec/arch/x86_64/kexec-bzImage64.c
@@ -307,7 +307,8 @@ int bzImage64_load_file(int argc, char **argv, struct kexec_info *info)
 			ret = -1;
 			goto out;
 		}
-	}
+	} else if (default_initrd_fd != -1)
+		info->initrd_fd = default_initrd_fd;
 
 	info->command_line = command_line;
 	info->command_line_len = command_line_len;
diff --git a/kexec/kexec.c b/kexec/kexec.c
index 7c614b0..91edb56 100644
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -67,6 +67,8 @@ int do_hotplug = 0;
 static unsigned long kexec_flags = 0;
 /* Flags for kexec file (fd) based syscall */
 static unsigned long kexec_file_flags = 0;
+/* initrd detected in probe phase */
+int default_initrd_fd = -1;
 int kexec_debug = 0;
 
 void dbgprint_mem_range(const char *prefix, struct memory_range *mr, int nr_mr)
diff --git a/kexec/kexec.h b/kexec/kexec.h
index 31c323f..396687d 100644
--- a/kexec/kexec.h
+++ b/kexec/kexec.h
@@ -114,6 +114,7 @@ do { \
 #define _ALIGN(addr, size)     _ALIGN_UP(addr, size)
 
 extern unsigned long long mem_min, mem_max;
+extern int default_initrd_fd;
 extern int kexec_debug;
 
 #define dbgprintf(...) \
-- 
2.41.0