[PATCHv2 1/3] kexec: Introduce implicit_initrd_fd to pass internal initrd information

[Pingfan Liu]

At present, initrd information is passed through --initrd args, and
handled until image load. But for the UKI case, the initrd may be stored
implicitly 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 implicit_initrd_fd.

Signed-off-by: Pingfan Liu <piliu at redhat.com>
Cc: Simon Horman <horms at kernel.org>
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..b6f8912 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 (implicit_initrd_fd != -1)
+			info->initrd_fd = implicit_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..210bc0a 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 (implicit_initrd_fd != -1)
+		info->initrd_fd = implicit_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..4f51987 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 implicit_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..e70c18d 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 implicit_initrd_fd;
 extern int kexec_debug;
 
 #define dbgprintf(...) \
-- 
2.41.0