x86, crash: wrap crash dumping code into crash related ifdefs

Now crash codes under kernel/ folder has been split out from kexec
code, crash dumping can be separated from kexec reboot in config
items on x86 with some adjustments.

Here, also change some ifdefs or IS_ENABLED() check to more appropriate
ones, e,g
 - #ifdef CONFIG_KEXEC_CORE -> #ifdef CONFIG_CRASH_DUMP
 - (!IS_ENABLED(CONFIG_KEXEC_CORE)) - > (!IS_ENABLED(CONFIG_CRASH_RESERVE))

[bhe@redhat.com: don't nest CONFIG_CRASH_DUMP ifdef inside CONFIG_KEXEC_CODE ifdef scope]
  Link: https://lore.kernel.org/all/SN6PR02MB4157931105FA68D72E3D3DB8D47B2@SN6PR02MB4157.namprd02.prod.outlook.com/T/#u
Link: https://lkml.kernel.org/r/20240124051254.67105-7-bhe@redhat.comSigned-off-by: Baoquan He <bhe@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Pingfan Liu <piliu@redhat.com>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Michael Kelley <mhklinux@outlook.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/x86/kernel/Makefile

@@ -100,9 +100,9 @@ obj-$(CONFIG_TRACING)		+= trace.o
 obj-$(CONFIG_RETHOOK)		+= rethook.o
 obj-$(CONFIG_VMCORE_INFO)	+= vmcore_info_$(BITS).o
 obj-$(CONFIG_KEXEC_CORE)	+= machine_kexec_$(BITS).o
-obj-$(CONFIG_KEXEC_CORE)	+= relocate_kernel_$(BITS).o crash.o
+obj-$(CONFIG_KEXEC_CORE)	+= relocate_kernel_$(BITS).o
 obj-$(CONFIG_KEXEC_FILE)	+= kexec-bzimage64.o
-obj-$(CONFIG_CRASH_DUMP)	+= crash_dump_$(BITS).o
+obj-$(CONFIG_CRASH_DUMP)	+= crash_dump_$(BITS).o crash.o
 obj-y				+= kprobes/
 obj-$(CONFIG_MODULES)		+= module.o
 obj-$(CONFIG_X86_32)		+= doublefault_32.o

arch/x86/kernel/cpu/mshyperv.c

@@ -209,7 +209,9 @@ static void hv_machine_shutdown(void)
 	if (kexec_in_progress)
 		hyperv_cleanup();
 }
+#endif /* CONFIG_KEXEC_CORE */
 
+#ifdef CONFIG_CRASH_DUMP
 static void hv_machine_crash_shutdown(struct pt_regs *regs)
 {
 	if (hv_crash_handler)
@@ -221,7 +223,7 @@ static void hv_machine_crash_shutdown(struct pt_regs *regs)
 	/* Disable the hypercall page when there is only 1 active CPU. */
 	hyperv_cleanup();
 }
-#endif /* CONFIG_KEXEC_CORE */
+#endif /* CONFIG_CRASH_DUMP */
 #endif /* CONFIG_HYPERV */
 
 static uint32_t  __init ms_hyperv_platform(void)
@@ -495,9 +497,13 @@ static void __init ms_hyperv_init_platform(void)
 	no_timer_check = 1;
 #endif
 
-#if IS_ENABLED(CONFIG_HYPERV) && defined(CONFIG_KEXEC_CORE)
+#if IS_ENABLED(CONFIG_HYPERV)
+#if defined(CONFIG_KEXEC_CORE)
 	machine_ops.shutdown = hv_machine_shutdown;
+#endif
+#if defined(CONFIG_CRASH_DUMP)
 	machine_ops.crash_shutdown = hv_machine_crash_shutdown;
+#endif
 #endif
 	if (ms_hyperv.features & HV_ACCESS_TSC_INVARIANT) {
 		/*

arch/x86/kernel/kexec-bzimage64.c

@@ -263,11 +263,13 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params,
 	memset(&params->hd0_info, 0, sizeof(params->hd0_info));
 	memset(&params->hd1_info, 0, sizeof(params->hd1_info));
 
+#ifdef CONFIG_CRASH_DUMP
 	if (image->type == KEXEC_TYPE_CRASH) {
 		ret = crash_setup_memmap_entries(image, params);
 		if (ret)
 			return ret;
 	} else
+#endif
 		setup_e820_entries(params);
 
 	nr_e820_entries = params->e820_entries;
@@ -433,12 +435,14 @@ static void *bzImage64_load(struct kimage *image, char *kernel,
 		return ERR_PTR(-EINVAL);
 	}
 
+#ifdef CONFIG_CRASH_DUMP
 	/* Allocate and load backup region */
 	if (image->type == KEXEC_TYPE_CRASH) {
 		ret = crash_load_segments(image);
 		if (ret)
 			return ERR_PTR(ret);
 	}
+#endif
 
 	/*
 	 * Load purgatory. For 64bit entry point, purgatory  code can be

arch/x86/kernel/kvm.c

@@ -770,7 +770,7 @@ static struct notifier_block kvm_pv_reboot_nb = {
  * won't be valid. In cases like kexec, in which you install a new kernel, this
  * means a random memory location will be kept being written.
  */
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 static void kvm_crash_shutdown(struct pt_regs *regs)
 {
 	kvm_guest_cpu_offline(true);
@@ -853,7 +853,7 @@ static void __init kvm_guest_init(void)
 	kvm_guest_cpu_init();
 #endif
 
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 	machine_ops.crash_shutdown = kvm_crash_shutdown;
 #endif
 

arch/x86/kernel/machine_kexec_64.c

@@ -508,6 +508,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 }
 #endif /* CONFIG_KEXEC_FILE */
 
+#ifdef CONFIG_CRASH_DUMP
+
 static int
 kexec_mark_range(unsigned long start, unsigned long end, bool protect)
 {
@@ -552,6 +554,7 @@ void arch_kexec_unprotect_crashkres(void)
 {
 	kexec_mark_crashkres(false);
 }
+#endif
 
 /*
  * During a traditional boot under SME, SME will encrypt the kernel,

arch/x86/kernel/reboot.c

@@ -796,7 +796,7 @@ struct machine_ops machine_ops __ro_after_init = {
 	.emergency_restart = native_machine_emergency_restart,
 	.restart = native_machine_restart,
 	.halt = native_machine_halt,
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 	.crash_shutdown = native_machine_crash_shutdown,
 #endif
 };
@@ -826,7 +826,7 @@ void machine_halt(void)
 	machine_ops.halt();
 }
 
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_CRASH_DUMP
 void machine_crash_shutdown(struct pt_regs *regs)
 {
 	machine_ops.crash_shutdown(regs);

arch/x86/kernel/setup.c

@@ -471,7 +471,7 @@ static void __init arch_reserve_crashkernel(void)
 	bool high = false;
 	int ret;
 
-	if (!IS_ENABLED(CONFIG_KEXEC_CORE))
+	if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
 		return;
 
 	ret = parse_crashkernel(cmdline, memblock_phys_mem_size(),

arch/x86/kernel/smp.c

@@ -282,7 +282,7 @@ struct smp_ops smp_ops = {
 	.smp_cpus_done		= native_smp_cpus_done,
 
 	.stop_other_cpus	= native_stop_other_cpus,
-#if defined(CONFIG_KEXEC_CORE)
+#if defined(CONFIG_CRASH_DUMP)
 	.crash_stop_other_cpus	= kdump_nmi_shootdown_cpus,
 #endif
 	.smp_send_reschedule	= native_smp_send_reschedule,

arch/x86/xen/enlighten_hvm.c

@@ -148,7 +148,9 @@ static void xen_hvm_shutdown(void)
 	if (kexec_in_progress)
 		xen_reboot(SHUTDOWN_soft_reset);
 }
+#endif
 
+#ifdef CONFIG_CRASH_DUMP
 static void xen_hvm_crash_shutdown(struct pt_regs *regs)
 {
 	native_machine_crash_shutdown(regs);
@@ -236,6 +238,8 @@ static void __init xen_hvm_guest_init(void)
 
 #ifdef CONFIG_KEXEC_CORE
 	machine_ops.shutdown = xen_hvm_shutdown;
+#endif
+#ifdef CONFIG_CRASH_DUMP
 	machine_ops.crash_shutdown = xen_hvm_crash_shutdown;
 #endif
 }

arch/x86/xen/mmu_pv.c

@@ -2520,7 +2520,7 @@ int xen_remap_pfn(struct vm_area_struct *vma, unsigned long addr,
 }
 EXPORT_SYMBOL_GPL(xen_remap_pfn);
 
-#ifdef CONFIG_KEXEC_CORE
+#ifdef CONFIG_VMCORE_INFO
 phys_addr_t paddr_vmcoreinfo_note(void)
 {
 	if (xen_pv_domain())