diff --git a/include/linux/crash_core.h b/include/linux/crash_core.h
index d8050a7eab01..4dbd6565e0ff 100644
--- a/include/linux/crash_core.h
+++ b/include/linux/crash_core.h
@@ -93,6 +93,34 @@ int parse_crashkernel_high(char *cmdline, unsigned long long system_ram,
 int parse_crashkernel_low(char *cmdline, unsigned long long system_ram,
 		unsigned long long *crash_size, unsigned long long *crash_base);
 
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+#ifndef DEFAULT_CRASH_KERNEL_LOW_SIZE
+#define DEFAULT_CRASH_KERNEL_LOW_SIZE	(128UL << 20)
+#endif
+#ifndef CRASH_ALIGN
+#define CRASH_ALIGN			SZ_2M
+#endif
+#ifndef CRASH_ADDR_LOW_MAX
+#define CRASH_ADDR_LOW_MAX		SZ_4G
+#endif
+#ifndef CRASH_ADDR_HIGH_MAX
+#define CRASH_ADDR_HIGH_MAX		memblock_end_of_DRAM()
+#endif
+
+void __init reserve_crashkernel_generic(char *cmdline,
+		unsigned long long crash_size,
+		unsigned long long crash_base,
+		unsigned long long crash_low_size,
+		bool high);
+#else
+static inline void __init reserve_crashkernel_generic(char *cmdline,
+		unsigned long long crash_size,
+		unsigned long long crash_base,
+		unsigned long long crash_low_size,
+		bool high)
+{}
+#endif
+
 /* Alignment required for elf header segment */
 #define ELF_CORE_HEADER_ALIGN   4096
 
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index dce2f5874fea..ca66b5f41dc7 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -5,7 +5,6 @@
  */
 
 #include <linux/buildid.h>
-#include <linux/crash_core.h>
 #include <linux/init.h>
 #include <linux/utsname.h>
 #include <linux/vmalloc.h>
@@ -13,6 +12,9 @@
 #include <linux/kexec.h>
 #include <linux/memory.h>
 #include <linux/cpuhotplug.h>
+#include <linux/memblock.h>
+#include <linux/kexec.h>
+#include <linux/kmemleak.h>
 
 #include <asm/page.h>
 #include <asm/sections.h>
@@ -360,6 +362,109 @@ static int __init parse_crashkernel_dummy(char *arg)
 }
 early_param("crashkernel", parse_crashkernel_dummy);
 
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+static int __init reserve_crashkernel_low(unsigned long long low_size)
+{
+#ifdef CONFIG_64BIT
+	unsigned long long low_base;
+
+	low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
+	if (!low_base) {
+		pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
+		return -ENOMEM;
+	}
+
+	pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",
+		low_base, low_base + low_size, low_size >> 20);
+
+	crashk_low_res.start = low_base;
+	crashk_low_res.end   = low_base + low_size - 1;
+	insert_resource(&iomem_resource, &crashk_low_res);
+#endif
+	return 0;
+}
+
+void __init reserve_crashkernel_generic(char *cmdline,
+			     unsigned long long crash_size,
+			     unsigned long long crash_base,
+			     unsigned long long crash_low_size,
+			     bool high)
+{
+	unsigned long long search_end = CRASH_ADDR_LOW_MAX, search_base = 0;
+	bool fixed_base = false;
+
+	/* User specifies base address explicitly. */
+	if (crash_base) {
+		fixed_base = true;
+		search_base = crash_base;
+		search_end = crash_base + crash_size;
+	} else if (high) {
+		search_base = CRASH_ADDR_LOW_MAX;
+		search_end = CRASH_ADDR_HIGH_MAX;
+	}
+
+retry:
+	crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
+					       search_base, search_end);
+	if (!crash_base) {
+		/*
+		 * For crashkernel=size[KMG]@offset[KMG], print out failure
+		 * message if can't reserve the specified region.
+		 */
+		if (fixed_base) {
+			pr_warn("crashkernel reservation failed - memory is in use.\n");
+			return;
+		}
+
+		/*
+		 * For crashkernel=size[KMG], if the first attempt was for
+		 * low memory, fall back to high memory, the minimum required
+		 * low memory will be reserved later.
+		 */
+		if (!high && search_end == CRASH_ADDR_LOW_MAX) {
+			search_end = CRASH_ADDR_HIGH_MAX;
+			search_base = CRASH_ADDR_LOW_MAX;
+			crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+			goto retry;
+		}
+
+		/*
+		 * For crashkernel=size[KMG],high, if the first attempt was
+		 * for high memory, fall back to low memory.
+		 */
+		if (high && search_end == CRASH_ADDR_HIGH_MAX) {
+			search_end = CRASH_ADDR_LOW_MAX;
+			search_base = 0;
+			goto retry;
+		}
+		pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
+			crash_size);
+		return;
+	}
+
+	if ((crash_base > CRASH_ADDR_LOW_MAX) &&
+	     crash_low_size && reserve_crashkernel_low(crash_low_size)) {
+		memblock_phys_free(crash_base, crash_size);
+		return;
+	}
+
+	pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
+		crash_base, crash_base + crash_size, crash_size >> 20);
+
+	/*
+	 * The crashkernel memory will be removed from the kernel linear
+	 * map. Inform kmemleak so that it won't try to access it.
+	 */
+	kmemleak_ignore_phys(crash_base);
+	if (crashk_low_res.end)
+		kmemleak_ignore_phys(crashk_low_res.start);
+
+	crashk_res.start = crash_base;
+	crashk_res.end = crash_base + crash_size - 1;
+	insert_resource(&iomem_resource, &crashk_res);
+}
+#endif
+
 int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
 			  void **addr, unsigned long *sz)
 {
