[PATCH v1 4/8] kexec: add machine_kexec_post_load()

STALE2618d SUPERSEDED

From: Pavel Tatashin <pasha.tatashin@soleen.com>
Date: 2019-08-01 15:24:51
Also in: kexec, linux-mm, lkml
Subsystem: kexec, the rest · Maintainers: Andrew Morton, Baoquan He, Mike Rapoport, Pasha Tatashin, Pratyush Yadav, Linus Torvalds

Revision v1 of 18 in this series.

Revisions (18)

2019-08-01 v1 current
2019-08-17 v2 [diff vs current]
2019-08-21 v3 [diff vs current]
2019-09-09 v4 [diff vs current]
2019-09-23 v5 [diff vs current]
2019-10-04 v6 [diff vs current]
2019-10-16 v7 [diff vs current]
2019-12-04 v8 [diff vs current]
2020-03-26 v9 [diff vs current]
2021-01-26 v10 [diff vs current]
2021-01-27 v11 [diff vs current]
2021-03-03 v12 [diff vs current]
2021-04-08 v13 [diff vs current]
2021-05-27 v1
2021-06-09 v15 [diff vs current]
2021-08-02 v16 [diff vs current]
2021-09-16 v17 [diff vs current]
2021-09-30 v18 [diff vs current]

It is the same as machine_kexec_prepare(), but is called after segments are
loaded. This way, can do processing work with already loaded relocation
segments. One such example is arm64: it has to have segments loaded in
order to create a page table, but it cannot do it during kexec time,
because at that time allocations won't be possible anymore.

Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
---
 kernel/kexec.c          | 4 ++++
 kernel/kexec_core.c     | 6 ++++++
 kernel/kexec_file.c     | 4 ++++
 kernel/kexec_internal.h | 2 ++
 4 files changed, 16 insertions(+)

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 1b018f1a6e0d..27b71dc7b35a 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c

@@ -159,6 +159,10 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
 
 	kimage_terminate(image);
 
+	ret = machine_kexec_post_load(image);
+	if (ret)
+		goto out;
+
 	/* Install the new kernel and uninstall the old */
 	image = xchg(dest_image, image);

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 2c5b72863b7b..8360645d1bbe 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c

@@ -587,6 +587,12 @@ static void kimage_free_extra_pages(struct kimage *image)
 	kimage_free_page_list(&image->unusable_pages);
 
 }
+
+int __weak machine_kexec_post_load(struct kimage *image)
+{
+	return 0;
+}
+
 void kimage_terminate(struct kimage *image)
 {
 	if (*image->entry != 0)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index b8cc032d5620..cb531d768114 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c

@@ -391,6 +391,10 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 
 	kimage_terminate(image);
 
+	ret = machine_kexec_post_load(image);
+	if (ret)
+		goto out;
+
 	/*
 	 * Free up any temporary buffers allocated which are not needed
 	 * after image has been loaded

diff --git a/kernel/kexec_internal.h b/kernel/kexec_internal.h
index 48aaf2ac0d0d..39d30ccf8d87 100644
--- a/kernel/kexec_internal.h
+++ b/kernel/kexec_internal.h

@@ -13,6 +13,8 @@ void kimage_terminate(struct kimage *image);
 int kimage_is_destination_range(struct kimage *image,
 				unsigned long start, unsigned long end);
 
+int machine_kexec_post_load(struct kimage *image);
+
 extern struct mutex kexec_mutex;
 
 #ifdef CONFIG_KEXEC_FILE

-- 
2.22.0


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