在 2025/10/30 21:58, Baoquan He 写道:
On 10/30/25 at 07:41pm, Qiang Ma wrote:
在 2025/10/30 17:42, Baoquan He 写道:
On 10/30/25 at 03:33pm, Qiang Ma wrote:
The commit a85ee18c7900 ("kexec_file: print out debugging message
if required") has added general code printing in kexec_file_load(),
but not in kexec_load().
Especially in the RISC-V architecture, kexec_image_info() has been
removed(commit eb7622d908a0 ("kexec_file, riscv: print out debugging
message if required")). As a result, when using '-d' for the kexec_load
interface, print nothing in the kernel space. This might be helpful for
verifying the accuracy of the data passed to the kernel. Therefore, refer to
this commit a85ee18c7900 ("kexec_file: print out debugging message
if required"), debug print information has been added.
kexec_file_dbg_print setting when CONFIG_KEXEC_FILE is set. I doubt it
doesn't work when you unset CONFIG_KEXEC_FILE.
Yes, I just actually tested it and it really doesn't work when unset
CONFIG_KEXEC_FILE.
In the next version, I can add a KEXEC_DEBUG for the kernel and kexec-tools.
Hold on please, it may not need that highweight change. I will reply to
you tomorrow if I have other idea.
Ok. My current idea is to refer to kexec_file, define a kexec_dbg_print,
initialize it in the kimage_alloc_init(), modify KEXEC_FLAGS and
kexec_dprintk,
and add the judgment of kexec_debug.
Signed-off-by: Qiang Ma <[email protected]>
---
kernel/kexec.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 28008e3d462e..02845a7499e9 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -151,7 +151,15 @@ static int do_kexec_load(unsigned long entry, unsigned
long nr_segments,
if (ret)
goto out;
+ kexec_dprintk("nr_segments = %lu\n", image->nr_segments);
for (i = 0; i < nr_segments; i++) {
+ struct kexec_segment *ksegment;
+
+ ksegment = &image->segment[i];
+ kexec_dprintk("segment[%d]: buf=0x%p bufsz=0x%zx mem=0x%lx
memsz=0x%zx\n",
+ i, ksegment->buf, ksegment->bufsz, ksegment->mem,
+ ksegment->memsz);
+
ret = kimage_load_segment(image, i);
if (ret)
goto out;
@@ -163,6 +171,9 @@ static int do_kexec_load(unsigned long entry, unsigned long
nr_segments,
if (ret)
goto out;
+ kexec_dprintk("kexec_file_load: type:%u, start:0x%lx head:0x%lx
flags:0x%lx\n",
+ image->type, image->start, image->head, flags);
+
/* Install the new kernel and uninstall the old */
image = xchg(dest_image, image);
--
2.20.1
