linux-kernel - [RFC PATCH v2 kexec-tools] kexec: Add and mark pmem region into PT

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Message-Id: <20230427101838.12267-5-lizhijian@fujitsu.com>
Date:   Thu, 27 Apr 2023 18:18:35 +0800
From:   Li Zhijian <lizhijian@...itsu.com>
To:     x86@...nel.org, nvdimm@...ts.linux.dev, kexec@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, y-goto@...itsu.com,
        yangx.jy@...itsu.com, ruansy.fnst@...itsu.com,
        Li Zhijian <lizhijian@...itsu.com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Dave Young <dyoung@...hat.com>
Subject: [RFC PATCH v2 kexec-tools] kexec: Add and mark pmem region into PT_LOADs

It does:
1. Add pmem region into PT_LOADs of vmcore
2. Mark pmem region's p_flags as PF_DEV

CC: Baoquan He <bhe@...hat.com>
CC: Vivek Goyal <vgoyal@...hat.com>
CC: Dave Young <dyoung@...hat.com>
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
 kexec/crashdump-elf.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kexec/crashdump-elf.c b/kexec/crashdump-elf.c
index b8bb686a17ca..ab257e825187 100644
--- a/kexec/crashdump-elf.c
+++ b/kexec/crashdump-elf.c
@@ -25,6 +25,8 @@ do {									\
 } while(0)
 #endif
 
+#define PF_DEV (1 << 4)
+
 /* Prepares the crash memory headers and stores in supplied buffer. */
 int FUNC(struct kexec_info *info,
 	 struct crash_elf_info *elf_info,
@@ -199,7 +201,7 @@ int FUNC(struct kexec_info *info,
 	 * A seprate program header for Backup Region*/
 	for (i = 0; i < ranges; i++, range++) {
 		unsigned long long mstart, mend;
-		if (range->type != RANGE_RAM)
+		if (range->type != RANGE_RAM && range->type != RANGE_PMEM)
 			continue;
 		mstart = range->start;
 		mend = range->end;
@@ -209,6 +211,8 @@ int FUNC(struct kexec_info *info,
 		bufp += sizeof(PHDR);
 		phdr->p_type	= PT_LOAD;
 		phdr->p_flags	= PF_R|PF_W|PF_X;
+		if (range->type == RANGE_PMEM)
+			phdr->p_flags |= PF_DEV;
 		phdr->p_offset	= mstart;
 
 		if (mstart == info->backup_src_start
-- 
2.29.2