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![Eric DeVolder](/assets/img/avatar_default.png)
The hotplug support for kexec_load() requires changes to the userspace kexec-tools and a little extra help from the kernel. Given a kdump capture kernel loaded via kexec_load(), and a subsequent hotplug event, the crash hotplug handler finds the elfcorehdr and rewrites it to reflect the hotplug change. That is the desired outcome, however, at kernel panic time, the purgatory integrity check fails (because the elfcorehdr changed), and the capture kernel does not boot and no vmcore is generated. Therefore, the userspace kexec-tools/kexec must indicate to the kernel that the elfcorehdr can be modified (because the kexec excluded the elfcorehdr from the digest, and sized the elfcorehdr memory buffer appropriately). To facilitate hotplug support with kexec_load(): - a new kexec flag KEXEC_UPATE_ELFCOREHDR indicates that it is safe for the kernel to modify the kexec_load()'d elfcorehdr - the /sys/kernel/crash_elfcorehdr_size node communicates the preferred size of the elfcorehdr memory buffer - The sysfs crash_hotplug nodes (ie. /sys/devices/system/[cpu|memory]/crash_hotplug) dynamically take into account kexec_file_load() vs kexec_load() and KEXEC_UPDATE_ELFCOREHDR. This is critical so that the udev rule processing of crash_hotplug is all that is needed to determine if the userspace unload-then-load of the kdump image is to be skipped, or not. The proposed udev rule change looks like: # The kernel updates the crash elfcorehdr for CPU and memory changes SUBSYSTEM=="cpu", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end" SUBSYSTEM=="memory", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end" The table below indicates the behavior of kexec_load()'d kdump image updates (with the new udev crash_hotplug rule in place): Kernel |Kexec -------+-----+---- Old |Old |New | a | a -------+-----+---- New | a | b -------+-----+---- where kexec 'old' and 'new' delineate kexec-tools has the needed modifications for the crash hotplug feature, and kernel 'old' and 'new' delineate the kernel supports this crash hotplug feature. Behavior 'a' indicates the unload-then-reload of the entire kdump image. For the kexec 'old' column, the unload-then-reload occurs due to the missing flag KEXEC_UPDATE_ELFCOREHDR. An 'old' kernel (with 'new' kexec) does not present the crash_hotplug sysfs node, which leads to the unload-then-reload of the kdump image. Behavior 'b' indicates the desired optimized behavior of the kernel directly modifying the elfcorehdr and avoiding the unload-then-reload of the kdump image. If the udev rule is not updated with crash_hotplug node check, then no matter any combination of kernel or kexec is new or old, the kdump image continues to be unload-then-reload on hotplug changes. To fully support crash hotplug feature, there needs to be a rollout of kernel, kexec-tools and udev rule changes. However, the order of the rollout of these pieces does not matter; kexec_load()'d kdump images still function for hotplug as-is. Link: https://lkml.kernel.org/r/20230814214446.6659-7-eric.devolder@oracle.com Signed-off-by: Eric DeVolder <eric.devolder@oracle.com> Suggested-by: Hari Bathini <hbathini@linux.ibm.com> Acked-by: Hari Bathini <hbathini@linux.ibm.com> Acked-by: Baoquan He <bhe@redhat.com> Cc: Akhil Raj <lf32.dev@gmail.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Dave Young <dyoung@redhat.com> Cc: David Hildenbrand <david@redhat.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Mimi Zohar <zohar@linux.ibm.com> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Sean Christopherson <seanjc@google.com> Cc: Sourabh Jain <sourabhjain@linux.ibm.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Weißschuh <linux@weissschuh.net> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
525 lines
14 KiB
C
525 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_KEXEC_H
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#define LINUX_KEXEC_H
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#define IND_DESTINATION_BIT 0
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#define IND_INDIRECTION_BIT 1
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#define IND_DONE_BIT 2
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#define IND_SOURCE_BIT 3
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#define IND_DESTINATION (1 << IND_DESTINATION_BIT)
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#define IND_INDIRECTION (1 << IND_INDIRECTION_BIT)
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#define IND_DONE (1 << IND_DONE_BIT)
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#define IND_SOURCE (1 << IND_SOURCE_BIT)
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#define IND_FLAGS (IND_DESTINATION | IND_INDIRECTION | IND_DONE | IND_SOURCE)
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#if !defined(__ASSEMBLY__)
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#include <linux/crash_core.h>
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#include <asm/io.h>
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#include <linux/range.h>
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#include <uapi/linux/kexec.h>
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#include <linux/verification.h>
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/* Location of a reserved region to hold the crash kernel.
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*/
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extern struct resource crashk_res;
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extern struct resource crashk_low_res;
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extern note_buf_t __percpu *crash_notes;
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#ifdef CONFIG_KEXEC_CORE
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#include <linux/list.h>
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#include <linux/compat.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/highmem.h>
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#include <asm/kexec.h>
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/* Verify architecture specific macros are defined */
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#ifndef KEXEC_SOURCE_MEMORY_LIMIT
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#error KEXEC_SOURCE_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_DESTINATION_MEMORY_LIMIT
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#error KEXEC_DESTINATION_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_MEMORY_LIMIT
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#error KEXEC_CONTROL_MEMORY_LIMIT not defined
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#endif
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#ifndef KEXEC_CONTROL_MEMORY_GFP
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#define KEXEC_CONTROL_MEMORY_GFP (GFP_KERNEL | __GFP_NORETRY)
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#endif
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#ifndef KEXEC_CONTROL_PAGE_SIZE
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#error KEXEC_CONTROL_PAGE_SIZE not defined
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#endif
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#ifndef KEXEC_ARCH
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#error KEXEC_ARCH not defined
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#endif
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#ifndef KEXEC_CRASH_CONTROL_MEMORY_LIMIT
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#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT KEXEC_CONTROL_MEMORY_LIMIT
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#endif
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#ifndef KEXEC_CRASH_MEM_ALIGN
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#define KEXEC_CRASH_MEM_ALIGN PAGE_SIZE
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#endif
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#define KEXEC_CORE_NOTE_NAME CRASH_CORE_NOTE_NAME
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/*
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* This structure is used to hold the arguments that are used when loading
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* kernel binaries.
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*/
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typedef unsigned long kimage_entry_t;
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struct kexec_segment {
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/*
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* This pointer can point to user memory if kexec_load() system
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* call is used or will point to kernel memory if
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* kexec_file_load() system call is used.
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*
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* Use ->buf when expecting to deal with user memory and use ->kbuf
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* when expecting to deal with kernel memory.
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*/
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union {
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void __user *buf;
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void *kbuf;
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};
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size_t bufsz;
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unsigned long mem;
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size_t memsz;
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};
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#ifdef CONFIG_COMPAT
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struct compat_kexec_segment {
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compat_uptr_t buf;
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compat_size_t bufsz;
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compat_ulong_t mem; /* User space sees this as a (void *) ... */
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compat_size_t memsz;
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};
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#endif
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#ifdef CONFIG_KEXEC_FILE
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struct purgatory_info {
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/*
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* Pointer to elf header at the beginning of kexec_purgatory.
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* Note: kexec_purgatory is read only
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*/
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const Elf_Ehdr *ehdr;
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/*
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* Temporary, modifiable buffer for sechdrs used for relocation.
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* This memory can be freed post image load.
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*/
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Elf_Shdr *sechdrs;
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/*
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* Temporary, modifiable buffer for stripped purgatory used for
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* relocation. This memory can be freed post image load.
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*/
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void *purgatory_buf;
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};
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struct kimage;
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typedef int (kexec_probe_t)(const char *kernel_buf, unsigned long kernel_size);
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typedef void *(kexec_load_t)(struct kimage *image, char *kernel_buf,
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unsigned long kernel_len, char *initrd,
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unsigned long initrd_len, char *cmdline,
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unsigned long cmdline_len);
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typedef int (kexec_cleanup_t)(void *loader_data);
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#ifdef CONFIG_KEXEC_SIG
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typedef int (kexec_verify_sig_t)(const char *kernel_buf,
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unsigned long kernel_len);
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#endif
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struct kexec_file_ops {
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kexec_probe_t *probe;
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kexec_load_t *load;
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kexec_cleanup_t *cleanup;
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#ifdef CONFIG_KEXEC_SIG
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kexec_verify_sig_t *verify_sig;
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#endif
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};
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extern const struct kexec_file_ops * const kexec_file_loaders[];
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int kexec_image_probe_default(struct kimage *image, void *buf,
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unsigned long buf_len);
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int kexec_image_post_load_cleanup_default(struct kimage *image);
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/*
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* If kexec_buf.mem is set to this value, kexec_locate_mem_hole()
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* will try to allocate free memory. Arch may overwrite it.
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*/
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#ifndef KEXEC_BUF_MEM_UNKNOWN
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#define KEXEC_BUF_MEM_UNKNOWN 0
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#endif
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/**
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* struct kexec_buf - parameters for finding a place for a buffer in memory
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* @image: kexec image in which memory to search.
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* @buffer: Contents which will be copied to the allocated memory.
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* @bufsz: Size of @buffer.
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* @mem: On return will have address of the buffer in memory.
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* @memsz: Size for the buffer in memory.
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* @buf_align: Minimum alignment needed.
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* @buf_min: The buffer can't be placed below this address.
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* @buf_max: The buffer can't be placed above this address.
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* @top_down: Allocate from top of memory.
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*/
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struct kexec_buf {
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struct kimage *image;
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void *buffer;
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unsigned long bufsz;
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unsigned long mem;
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unsigned long memsz;
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unsigned long buf_align;
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unsigned long buf_min;
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unsigned long buf_max;
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bool top_down;
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};
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int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf);
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int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
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void *buf, unsigned int size,
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bool get_value);
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void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name);
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#ifndef arch_kexec_kernel_image_probe
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static inline int
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arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len)
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{
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return kexec_image_probe_default(image, buf, buf_len);
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}
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#endif
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#ifndef arch_kimage_file_post_load_cleanup
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static inline int arch_kimage_file_post_load_cleanup(struct kimage *image)
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{
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return kexec_image_post_load_cleanup_default(image);
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}
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#endif
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#ifdef CONFIG_KEXEC_SIG
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#ifdef CONFIG_SIGNED_PE_FILE_VERIFICATION
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int kexec_kernel_verify_pe_sig(const char *kernel, unsigned long kernel_len);
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#endif
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#endif
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extern int kexec_add_buffer(struct kexec_buf *kbuf);
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int kexec_locate_mem_hole(struct kexec_buf *kbuf);
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#ifndef arch_kexec_locate_mem_hole
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/**
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* arch_kexec_locate_mem_hole - Find free memory to place the segments.
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* @kbuf: Parameters for the memory search.
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*
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* On success, kbuf->mem will have the start address of the memory region found.
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*
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* Return: 0 on success, negative errno on error.
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*/
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static inline int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
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{
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return kexec_locate_mem_hole(kbuf);
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}
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#endif
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#ifndef arch_kexec_apply_relocations_add
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/*
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* arch_kexec_apply_relocations_add - apply relocations of type RELA
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* @pi: Purgatory to be relocated.
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* @section: Section relocations applying to.
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* @relsec: Section containing RELAs.
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* @symtab: Corresponding symtab.
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*
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* Return: 0 on success, negative errno on error.
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*/
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static inline int
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arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
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const Elf_Shdr *relsec, const Elf_Shdr *symtab)
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{
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pr_err("RELA relocation unsupported.\n");
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return -ENOEXEC;
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}
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#endif
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#ifndef arch_kexec_apply_relocations
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/*
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* arch_kexec_apply_relocations - apply relocations of type REL
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* @pi: Purgatory to be relocated.
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* @section: Section relocations applying to.
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* @relsec: Section containing RELs.
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* @symtab: Corresponding symtab.
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*
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* Return: 0 on success, negative errno on error.
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*/
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static inline int
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arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
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const Elf_Shdr *relsec, const Elf_Shdr *symtab)
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{
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pr_err("REL relocation unsupported.\n");
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return -ENOEXEC;
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}
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#endif
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#endif /* CONFIG_KEXEC_FILE */
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#ifdef CONFIG_KEXEC_ELF
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struct kexec_elf_info {
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/*
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* Where the ELF binary contents are kept.
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* Memory managed by the user of the struct.
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*/
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const char *buffer;
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const struct elfhdr *ehdr;
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const struct elf_phdr *proghdrs;
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};
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int kexec_build_elf_info(const char *buf, size_t len, struct elfhdr *ehdr,
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struct kexec_elf_info *elf_info);
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int kexec_elf_load(struct kimage *image, struct elfhdr *ehdr,
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struct kexec_elf_info *elf_info,
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struct kexec_buf *kbuf,
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unsigned long *lowest_load_addr);
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void kexec_free_elf_info(struct kexec_elf_info *elf_info);
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int kexec_elf_probe(const char *buf, unsigned long len);
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#endif
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struct kimage {
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kimage_entry_t head;
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kimage_entry_t *entry;
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kimage_entry_t *last_entry;
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unsigned long start;
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struct page *control_code_page;
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struct page *swap_page;
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void *vmcoreinfo_data_copy; /* locates in the crash memory */
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unsigned long nr_segments;
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struct kexec_segment segment[KEXEC_SEGMENT_MAX];
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struct list_head control_pages;
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struct list_head dest_pages;
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struct list_head unusable_pages;
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/* Address of next control page to allocate for crash kernels. */
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unsigned long control_page;
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/* Flags to indicate special processing */
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unsigned int type : 1;
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#define KEXEC_TYPE_DEFAULT 0
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#define KEXEC_TYPE_CRASH 1
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unsigned int preserve_context : 1;
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/* If set, we are using file mode kexec syscall */
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unsigned int file_mode:1;
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#ifdef CONFIG_CRASH_HOTPLUG
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/* If set, allow changes to elfcorehdr of kexec_load'd image */
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unsigned int update_elfcorehdr:1;
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#endif
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#ifdef ARCH_HAS_KIMAGE_ARCH
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struct kimage_arch arch;
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#endif
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#ifdef CONFIG_KEXEC_FILE
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/* Additional fields for file based kexec syscall */
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void *kernel_buf;
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unsigned long kernel_buf_len;
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void *initrd_buf;
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unsigned long initrd_buf_len;
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char *cmdline_buf;
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unsigned long cmdline_buf_len;
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/* File operations provided by image loader */
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const struct kexec_file_ops *fops;
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/* Image loader handling the kernel can store a pointer here */
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void *image_loader_data;
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/* Information for loading purgatory */
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struct purgatory_info purgatory_info;
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#endif
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#ifdef CONFIG_CRASH_HOTPLUG
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int hp_action;
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int elfcorehdr_index;
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bool elfcorehdr_updated;
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#endif
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#ifdef CONFIG_IMA_KEXEC
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/* Virtual address of IMA measurement buffer for kexec syscall */
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void *ima_buffer;
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phys_addr_t ima_buffer_addr;
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size_t ima_buffer_size;
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#endif
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/* Core ELF header buffer */
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void *elf_headers;
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unsigned long elf_headers_sz;
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unsigned long elf_load_addr;
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};
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/* kexec interface functions */
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extern void machine_kexec(struct kimage *image);
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extern int machine_kexec_prepare(struct kimage *image);
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extern void machine_kexec_cleanup(struct kimage *image);
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extern int kernel_kexec(void);
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extern struct page *kimage_alloc_control_pages(struct kimage *image,
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unsigned int order);
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#ifndef machine_kexec_post_load
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static inline int machine_kexec_post_load(struct kimage *image) { return 0; }
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#endif
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extern void __crash_kexec(struct pt_regs *);
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extern void crash_kexec(struct pt_regs *);
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int kexec_should_crash(struct task_struct *);
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int kexec_crash_loaded(void);
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void crash_save_cpu(struct pt_regs *regs, int cpu);
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extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
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extern struct kimage *kexec_image;
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extern struct kimage *kexec_crash_image;
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bool kexec_load_permitted(int kexec_image_type);
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#ifndef kexec_flush_icache_page
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#define kexec_flush_icache_page(page)
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#endif
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/* List of defined/legal kexec flags */
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#ifndef CONFIG_KEXEC_JUMP
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#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_UPDATE_ELFCOREHDR)
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#else
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#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR)
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#endif
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/* List of defined/legal kexec file flags */
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#define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \
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KEXEC_FILE_NO_INITRAMFS)
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/* flag to track if kexec reboot is in progress */
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extern bool kexec_in_progress;
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int crash_shrink_memory(unsigned long new_size);
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ssize_t crash_get_memory_size(void);
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#ifndef arch_kexec_protect_crashkres
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/*
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* Protection mechanism for crashkernel reserved memory after
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* the kdump kernel is loaded.
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*
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* Provide an empty default implementation here -- architecture
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* code may override this
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*/
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static inline void arch_kexec_protect_crashkres(void) { }
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#endif
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#ifndef arch_kexec_unprotect_crashkres
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static inline void arch_kexec_unprotect_crashkres(void) { }
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#endif
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#ifndef page_to_boot_pfn
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static inline unsigned long page_to_boot_pfn(struct page *page)
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|
{
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return page_to_pfn(page);
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}
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#endif
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|
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#ifndef boot_pfn_to_page
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|
static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
|
|
{
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return pfn_to_page(boot_pfn);
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}
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#endif
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|
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|
#ifndef phys_to_boot_phys
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|
static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
|
|
{
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|
return phys;
|
|
}
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|
#endif
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|
|
|
#ifndef boot_phys_to_phys
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|
static inline phys_addr_t boot_phys_to_phys(unsigned long boot_phys)
|
|
{
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|
return boot_phys;
|
|
}
|
|
#endif
|
|
|
|
#ifndef crash_free_reserved_phys_range
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|
static inline void crash_free_reserved_phys_range(unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
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|
|
|
for (addr = begin; addr < end; addr += PAGE_SIZE)
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|
free_reserved_page(boot_pfn_to_page(addr >> PAGE_SHIFT));
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|
}
|
|
#endif
|
|
|
|
static inline unsigned long virt_to_boot_phys(void *addr)
|
|
{
|
|
return phys_to_boot_phys(__pa((unsigned long)addr));
|
|
}
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|
|
|
static inline void *boot_phys_to_virt(unsigned long entry)
|
|
{
|
|
return phys_to_virt(boot_phys_to_phys(entry));
|
|
}
|
|
|
|
#ifndef arch_kexec_post_alloc_pages
|
|
static inline int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp) { return 0; }
|
|
#endif
|
|
|
|
#ifndef arch_kexec_pre_free_pages
|
|
static inline void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages) { }
|
|
#endif
|
|
|
|
#ifndef arch_crash_handle_hotplug_event
|
|
static inline void arch_crash_handle_hotplug_event(struct kimage *image) { }
|
|
#endif
|
|
|
|
int crash_check_update_elfcorehdr(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; }
|
|
#endif
|
|
|
|
#ifndef crash_get_elfcorehdr_size
|
|
static inline unsigned int crash_get_elfcorehdr_size(void) { return 0; }
|
|
#endif
|
|
|
|
#else /* !CONFIG_KEXEC_CORE */
|
|
struct pt_regs;
|
|
struct task_struct;
|
|
static inline void __crash_kexec(struct pt_regs *regs) { }
|
|
static inline void crash_kexec(struct pt_regs *regs) { }
|
|
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
|
|
static inline int kexec_crash_loaded(void) { return 0; }
|
|
#define kexec_in_progress false
|
|
#endif /* CONFIG_KEXEC_CORE */
|
|
|
|
#ifdef CONFIG_KEXEC_SIG
|
|
void set_kexec_sig_enforced(void);
|
|
#else
|
|
static inline void set_kexec_sig_enforced(void) {}
|
|
#endif
|
|
|
|
#endif /* !defined(__ASSEBMLY__) */
|
|
|
|
#endif /* LINUX_KEXEC_H */
|