linux-kernel - [PATCH v4 3/7] kexec_file, x86: print out debugging message if required

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Message-ID: <20231213055747.61826-4-bhe@redhat.com>
Date:   Wed, 13 Dec 2023 13:57:43 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     kexec@...ts.infradead.org, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
        linux-parisc@...r.kernel.org, akpm@...ux-foundation.org,
        joe@...ches.com, nathan@...nel.org, conor@...nel.org,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v4 3/7] kexec_file, x86: print out debugging message if required

Then when specifying '-d' for kexec_file_load interface, loaded
locations of kernel/initrd/cmdline etc can be printed out to help
debug.

Here replace pr_debug() with the newly added kexec_dprintk() in
kexec_file loading related codes.

And also print out e820 memmap passed to 2nd kernel just as kexec_load
interface has been doing.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/kernel/crash.c           |  4 ++--
 arch/x86/kernel/kexec-bzimage64.c | 23 ++++++++++++++---------
 2 files changed, 16 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index c92d88680dbf..1715e5f06a59 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -386,8 +386,8 @@ int crash_load_segments(struct kimage *image)
 	if (ret)
 		return ret;
 	image->elf_load_addr = kbuf.mem;
-	pr_debug("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
-		 image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
+	kexec_dprintk("Loaded ELF headers at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+		      image->elf_load_addr, kbuf.bufsz, kbuf.memsz);
 
 	return ret;
 }
diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c
index a61c12c01270..e9ae0eac6bf9 100644
--- a/arch/x86/kernel/kexec-bzimage64.c
+++ b/arch/x86/kernel/kexec-bzimage64.c
@@ -82,7 +82,7 @@ static int setup_cmdline(struct kimage *image, struct boot_params *params,
 
 	cmdline_ptr[cmdline_len - 1] = '\0';
 
-	pr_debug("Final command line is: %s\n", cmdline_ptr);
+	kexec_dprintk("Final command line is: %s\n", cmdline_ptr);
 	cmdline_ptr_phys = bootparams_load_addr + cmdline_offset;
 	cmdline_low_32 = cmdline_ptr_phys & 0xffffffffUL;
 	cmdline_ext_32 = cmdline_ptr_phys >> 32;
@@ -272,7 +272,12 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params,
 
 	nr_e820_entries = params->e820_entries;
 
+	kexec_dprintk("E820 memmap:\n");
 	for (i = 0; i < nr_e820_entries; i++) {
+		kexec_dprintk("%016llx-%016llx (%d)\n",
+			      params->e820_table[i].addr,
+			      params->e820_table[i].addr + params->e820_table[i].size - 1,
+			      params->e820_table[i].type);
 		if (params->e820_table[i].type != E820_TYPE_RAM)
 			continue;
 		start = params->e820_table[i].addr;
@@ -424,7 +429,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 	 * command line. Make sure it does not overflow
 	 */
 	if (cmdline_len + MAX_ELFCOREHDR_STR_LEN > header->cmdline_size) {
-		pr_debug("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
+		kexec_dprintk("Appending elfcorehdr=<addr> to command line exceeds maximum allowed length\n");
 		return ERR_PTR(-EINVAL);
 	}
 
@@ -445,7 +450,7 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 		return ERR_PTR(ret);
 	}
 
-	pr_debug("Loaded purgatory at 0x%lx\n", pbuf.mem);
+	kexec_dprintk("Loaded purgatory at 0x%lx\n", pbuf.mem);
 
 
 	/*
@@ -490,8 +495,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 	if (ret)
 		goto out_free_params;
 	bootparam_load_addr = kbuf.mem;
-	pr_debug("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
-		 bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
+	kexec_dprintk("Loaded boot_param, command line and misc at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+		      bootparam_load_addr, kbuf.bufsz, kbuf.bufsz);
 
 	/* Load kernel */
 	kbuf.buffer = kernel + kern16_size;
@@ -505,8 +510,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 		goto out_free_params;
 	kernel_load_addr = kbuf.mem;
 
-	pr_debug("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
-		 kernel_load_addr, kbuf.bufsz, kbuf.memsz);
+	kexec_dprintk("Loaded 64bit kernel at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+		      kernel_load_addr, kbuf.bufsz, kbuf.memsz);
 
 	/* Load initrd high */
 	if (initrd) {
@@ -520,8 +525,8 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 			goto out_free_params;
 		initrd_load_addr = kbuf.mem;
 
-		pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
-				initrd_load_addr, initrd_len, initrd_len);
+		kexec_dprintk("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n",
+			      initrd_load_addr, initrd_len, initrd_len);
 
 		setup_initrd(params, initrd_load_addr, initrd_len);
 	}
-- 
2.41.0