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crash: add a new kexec flag for hotplug support 

Commit a72bbec70d ("crash: hotplug support for kexec_load()")
introduced a new kexec flag, `KEXEC_UPDATE_ELFCOREHDR`. Kexec tool uses
this flag to indicate to the kernel that it is safe to modify the
elfcorehdr of the kdump image loaded using the kexec_load system call.

However, it is possible that architectures may need to update kexec
segments other then elfcorehdr. For example, FDT (Flatten Device Tree)
on PowerPC. Introducing a new kexec flag for every new kexec segment
may not be a good solution. Hence, a generic kexec flag bit,
`KEXEC_CRASH_HOTPLUG_SUPPORT`, is introduced to share the CPU/Memory
hotplug support intent between the kexec tool and the kernel for the
kexec_load system call.

Now we have two kexec flags that enables crash hotplug support for
kexec_load system call. First is KEXEC_UPDATE_ELFCOREHDR (only used in
x86), and second is KEXEC_CRASH_HOTPLUG_SUPPORT (for all architectures).

To simplify the process of finding and reporting the crash hotplug
support the following changes are introduced.

1. Define arch specific function to process the kexec flags and
   determine crash hotplug support

2. Rename the @update_elfcorehdr member of struct kimage to
   @hotplug_support and populate it for both kexec_load and
   kexec_file_load syscalls, because architecture can update more than
   one kexec segment

3. Let generic function crash_check_hotplug_support report hotplug
   support for loaded kdump image based on value of @hotplug_support

To bring the x86 crash hotplug support in line with the above points,
the following changes have been made:

- Introduce the arch_crash_hotplug_support function to process kexec
  flags and determine crash hotplug support

- Remove the arch_crash_hotplug_[cpu|memory]_support functions

Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240326055413.186534-3-sourabhjain@linux.ibm.com
This commit is contained in:
Sourabh Jain 2024-03-26 11:24:09 +05:30 committed by Michael Ellerman
parent 118005713e
commit 79365026f8
10 changed files with 48 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/include/asm/kexec.h
View File

@ -210,15 +210,8 @@ extern void kdump_nmi_shootdown_cpus(void);
void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
#define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
#ifdef CONFIG_HOTPLUG_CPU
int arch_crash_hotplug_cpu_support(void);
#define crash_hotplug_cpu_support arch_crash_hotplug_cpu_support
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_crash_hotplug_memory_support(void);
#define crash_hotplug_memory_support arch_crash_hotplug_memory_support
#endif
int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
#define arch_crash_hotplug_support arch_crash_hotplug_support
unsigned int arch_crash_get_elfcorehdr_size(void);
#define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size

28
arch/x86/kernel/crash.c
View File

@ -402,20 +402,26 @@ int crash_load_segments(struct kimage *image)
#undef pr_fmt
#define pr_fmt(fmt) "crash hp: " fmt
/* These functions provide the value for the sysfs crash_hotplug nodes */
#ifdef CONFIG_HOTPLUG_CPU
int arch_crash_hotplug_cpu_support(void)
int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags)
{
return crash_check_update_elfcorehdr();
}
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_crash_hotplug_memory_support(void)
{
return crash_check_update_elfcorehdr();
}
#ifdef CONFIG_KEXEC_FILE
if (image->file_mode)
return 1;
#endif
/*
* Initially, crash hotplug support for kexec_load was added
* with the KEXEC_UPDATE_ELFCOREHDR flag. Later, this
* functionality was expanded to accommodate multiple kexec
* segment updates, leading to the introduction of the
* KEXEC_CRASH_HOTPLUG_SUPPORT kexec flag bit. Consequently,
* when the kexec tool sends either of these flags, it indicates
* that the required kexec segment (elfcorehdr) is excluded from
* the SHA calculation.
*/
return (kexec_flags & KEXEC_UPDATE_ELFCOREHDR ||
kexec_flags & KEXEC_CRASH_HOTPLUG_SUPPORT);
}
unsigned int arch_crash_get_elfcorehdr_size(void)
{

2
drivers/base/cpu.c
View File

@ -306,7 +306,7 @@ static ssize_t crash_hotplug_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sysfs_emit(buf, "%d\n", crash_hotplug_cpu_support());
return sysfs_emit(buf, "%d\n", crash_check_hotplug_support());
}
static DEVICE_ATTR_ADMIN_RO(crash_hotplug);
#endif

2
drivers/base/memory.c
View File

@ -535,7 +535,7 @@ static DEVICE_ATTR_RW(auto_online_blocks);
static ssize_t crash_hotplug_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return sysfs_emit(buf, "%d\n", crash_hotplug_memory_support());
return sysfs_emit(buf, "%d\n", crash_check_hotplug_support());
}
static DEVICE_ATTR_RO(crash_hotplug);
#endif

13
include/linux/crash_core.h
View File

@ -40,14 +40,13 @@ static inline void arch_kexec_unprotect_crashkres(void) { }
static inline void arch_crash_handle_hotplug_event(struct kimage *image, void *arg) { }
#endif
int crash_check_update_elfcorehdr(void);
int crash_check_hotplug_support(void);
#ifndef crash_hotplug_cpu_support
static inline int crash_hotplug_cpu_support(void) { return 0; }
#endif
#ifndef crash_hotplug_memory_support
static inline int crash_hotplug_memory_support(void) { return 0; }
#ifndef arch_crash_hotplug_support
static inline int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags)
{
return 0;
}
#endif
#ifndef crash_get_elfcorehdr_size

11
include/linux/kexec.h
View File

@ -319,8 +319,10 @@ struct kimage {
/* If set, we are using file mode kexec syscall */
unsigned int file_mode:1;
#ifdef CONFIG_CRASH_HOTPLUG
/* If set, allow changes to elfcorehdr of kexec_load'd image */
unsigned int update_elfcorehdr:1;
/* If set, it is safe to update kexec segments that are
* excluded from SHA calculation.
*/
unsigned int hotplug_support:1;
#endif
#ifdef ARCH_HAS_KIMAGE_ARCH
@ -391,9 +393,10 @@ bool kexec_load_permitted(int kexec_image_type);
/* List of defined/legal kexec flags */
#ifndef CONFIG_KEXEC_JUMP
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_UPDATE_ELFCOREHDR)
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_UPDATE_ELFCOREHDR | KEXEC_CRASH_HOTPLUG_SUPPORT)
#else
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR)
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR | \
KEXEC_CRASH_HOTPLUG_SUPPORT)
#endif
/* List of defined/legal kexec file flags */

1
include/uapi/linux/kexec.h
View File

@ -13,6 +13,7 @@
#define KEXEC_ON_CRASH 0x00000001
#define KEXEC_PRESERVE_CONTEXT 0x00000002
#define KEXEC_UPDATE_ELFCOREHDR 0x00000004
#define KEXEC_CRASH_HOTPLUG_SUPPORT 0x00000008
#define KEXEC_ARCH_MASK 0xffff0000
/*

15
kernel/crash_core.c
View File

@ -493,10 +493,10 @@ static DEFINE_MUTEX(__crash_hotplug_lock);
/*
* This routine utilized when the crash_hotplug sysfs node is read.
* It reflects the kernel's ability/permission to update the crash
* elfcorehdr directly.
* It reflects the kernel's ability/permission to update the kdump
* image directly.
*/
int crash_check_update_elfcorehdr(void)
int crash_check_hotplug_support(void)
{
int rc = 0;
@ -508,10 +508,7 @@ int crash_check_update_elfcorehdr(void)
return 0;
}
if (kexec_crash_image) {
if (kexec_crash_image->file_mode)
rc = 1;
else
rc = kexec_crash_image->update_elfcorehdr;
rc = kexec_crash_image->hotplug_support;
}
/* Release lock now that update complete */
kexec_unlock();
@ -552,8 +549,8 @@ static void crash_handle_hotplug_event(unsigned int hp_action, unsigned int cpu,
image = kexec_crash_image;
/* Check that updating elfcorehdr is permitted */
if (!(image->file_mode || image->update_elfcorehdr))
/* Check that kexec segments update is permitted */
if (!image->hotplug_support)
goto out;
if (hp_action == KEXEC_CRASH_HP_ADD_CPU ||

4
kernel/kexec.c
View File

@ -135,8 +135,8 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments,
image->preserve_context = 1;
#ifdef CONFIG_CRASH_HOTPLUG
if (flags & KEXEC_UPDATE_ELFCOREHDR)
image->update_elfcorehdr = 1;
if ((flags & KEXEC_ON_CRASH) && arch_crash_hotplug_support(image, flags))
image->hotplug_support = 1;
#endif
ret = machine_kexec_prepare(image);

5
kernel/kexec_file.c
View File

@ -376,6 +376,11 @@ SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
if (ret)
goto out;
#ifdef CONFIG_CRASH_HOTPLUG
if ((flags & KEXEC_FILE_ON_CRASH) && arch_crash_hotplug_support(image, flags))
image->hotplug_support = 1;
#endif
ret = machine_kexec_prepare(image);
if (ret)
goto out;