diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h
index 4021203..130d7fe 100644
--- a/arch/x86/include/asm/mem_encrypt.h
+++ b/arch/x86/include/asm/mem_encrypt.h
@@ -31,6 +31,9 @@ void __init sme_early_encrypt(resource_size_t paddr,
 void __init sme_early_decrypt(resource_size_t paddr,
 			      unsigned long size);
 
+void __init sme_map_bootdata(char *real_mode_data);
+void __init sme_unmap_bootdata(char *real_mode_data);
+
 void __init sme_early_init(void);
 
 #else	/* !CONFIG_AMD_MEM_ENCRYPT */
@@ -54,6 +57,14 @@ static inline void __init sme_early_decrypt(resource_size_t paddr,
 {
 }
 
+static inline void __init sme_map_bootdata(char *real_mode_data)
+{
+}
+
+static inline void __init sme_unmap_bootdata(char *real_mode_data)
+{
+}
+
 static inline void __init sme_early_init(void)
 {
 }
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 1f9a2c4..1611bb5 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -23,6 +23,9 @@
 #ifndef __ASSEMBLY__
 #include <asm/x86_init.h>
 
+extern pgd_t early_level4_pgt[PTRS_PER_PGD];
+int __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
+
 void ptdump_walk_pgd_level(struct seq_file *m, pgd_t *pgd);
 void ptdump_walk_pgd_level_checkwx(void);
 
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 9056cf9..e789e14 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -34,7 +34,6 @@
 /*
  * Manage page tables very early on.
  */
-extern pgd_t early_level4_pgt[PTRS_PER_PGD];
 extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
 static unsigned int __initdata next_early_pgt = 2;
 pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
@@ -48,12 +47,12 @@ static void __init reset_early_page_tables(void)
 }
 
 /* Create a new PMD entry */
-int __init early_make_pgtable(unsigned long address)
+int __init __early_make_pgtable(unsigned long address, pmdval_t pmd)
 {
 	unsigned long physaddr = address - __PAGE_OFFSET;
 	pgdval_t pgd, *pgd_p;
 	pudval_t pud, *pud_p;
-	pmdval_t pmd, *pmd_p;
+	pmdval_t *pmd_p;
 
 	/* Invalid address or early pgt is done ?  */
 	if (physaddr >= MAXMEM || read_cr3() != __sme_pa_nodebug(early_level4_pgt))
@@ -95,12 +94,21 @@ int __init early_make_pgtable(unsigned long address)
 		memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD);
 		*pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
 	}
-	pmd = (physaddr & PMD_MASK) + early_pmd_flags;
 	pmd_p[pmd_index(address)] = pmd;
 
 	return 0;
 }
 
+int __init early_make_pgtable(unsigned long address)
+{
+	unsigned long physaddr = address - __PAGE_OFFSET;
+	pmdval_t pmd;
+
+	pmd = (physaddr & PMD_MASK) + early_pmd_flags;
+
+	return __early_make_pgtable(address, pmd);
+}
+
 /* Don't add a printk in there. printk relies on the PDA which is not initialized 
    yet. */
 static void __init clear_bss(void)
@@ -123,6 +131,12 @@ static void __init copy_bootdata(char *real_mode_data)
 	char * command_line;
 	unsigned long cmd_line_ptr;
 
+	/*
+	 * If SME is active, this will create decrypted mappings of the
+	 * boot data in advance of the copy operations.
+	 */
+	sme_map_bootdata(real_mode_data);
+
 	memcpy(&boot_params, real_mode_data, sizeof boot_params);
 	sanitize_boot_params(&boot_params);
 	cmd_line_ptr = get_cmd_line_ptr();
@@ -130,6 +144,14 @@ static void __init copy_bootdata(char *real_mode_data)
 		command_line = __va(cmd_line_ptr);
 		memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 	}
+
+	/*
+	 * The old boot data is no longer needed and won't be reserved,
+	 * freeing up that memory for use by the system. If SME is active,
+	 * we need to remove the mappings that were created so that the
+	 * memory doesn't remain mapped as decrypted.
+	 */
+	sme_unmap_bootdata(real_mode_data);
 }
 
 asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 603a166..a95800b 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -115,6 +115,7 @@
 #include <asm/microcode.h>
 #include <asm/mmu_context.h>
 #include <asm/kaslr.h>
+#include <asm/mem_encrypt.h>
 
 /*
  * max_low_pfn_mapped: highest direct mapped pfn under 4GB
@@ -374,6 +375,15 @@ static void __init reserve_initrd(void)
 	    !ramdisk_image || !ramdisk_size)
 		return;		/* No initrd provided by bootloader */
 
+	/*
+	 * If SME is active, this memory will be marked encrypted by the
+	 * kernel when it is accessed (including relocation). However, the
+	 * ramdisk image was loaded decrypted by the bootloader, so make
+	 * sure that it is encrypted before accessing it.
+	 */
+	if (sme_active())
+		sme_early_encrypt(ramdisk_image, ramdisk_end - ramdisk_image);
+
 	initrd_start = 0;
 
 	mapped_size = memblock_mem_size(max_pfn_mapped);
diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
index 18c0887..2321f05 100644
--- a/arch/x86/mm/mem_encrypt.c
+++ b/arch/x86/mm/mem_encrypt.c
@@ -19,6 +19,8 @@
 
 #include <asm/tlbflush.h>
 #include <asm/fixmap.h>
+#include <asm/setup.h>
+#include <asm/bootparam.h>
 
 /*
  * Since SME related variables are set early in the boot process they must
@@ -101,6 +103,81 @@ void __init sme_early_decrypt(resource_size_t paddr, unsigned long size)
 	__sme_early_enc_dec(paddr, size, false);
 }
 
+static void __init sme_early_pgtable_flush(void)
+{
+	write_cr3(__sme_pa_nodebug(early_level4_pgt));
+}
+
+static void __init __sme_early_map_unmap_mem(void *vaddr, unsigned long size,
+					     bool map)
+{
+	unsigned long paddr = (unsigned long)vaddr - __PAGE_OFFSET;
+	pmdval_t pmd_flags, pmd;
+
+	/* Use early_pmd_flags but remove the encryption mask */
+	pmd_flags = __sme_clr(early_pmd_flags);
+
+	do {
+		pmd = map ? (paddr & PMD_MASK) + pmd_flags : 0;
+		__early_make_pgtable((unsigned long)vaddr, pmd);
+
+		vaddr += PMD_SIZE;
+		paddr += PMD_SIZE;
+		size = (size <= PMD_SIZE) ? 0 : size - PMD_SIZE;
+	} while (size);
+}
+
+static void __init __sme_map_unmap_bootdata(char *real_mode_data, bool map)
+{
+	struct boot_params *boot_data;
+	unsigned long cmdline_paddr;
+
+	__sme_early_map_unmap_mem(real_mode_data, sizeof(boot_params), map);
+	boot_data = (struct boot_params *)real_mode_data;
+
+	/*
+	 * Determine the command line address only after having established
+	 * the decrypted mapping.
+	 */
+	cmdline_paddr = boot_data->hdr.cmd_line_ptr |
+			((u64)boot_data->ext_cmd_line_ptr << 32);
+
+	if (cmdline_paddr)
+		__sme_early_map_unmap_mem(__va(cmdline_paddr),
+					  COMMAND_LINE_SIZE, map);
+}
+
+void __init sme_unmap_bootdata(char *real_mode_data)
+{
+	/* If SME is not active, the bootdata is in the correct state */
+	if (!sme_active())
+		return;
+
+	/*
+	 * The bootdata and command line aren't needed anymore so clear
+	 * any mapping of them.
+	 */
+	__sme_map_unmap_bootdata(real_mode_data, false);
+
+	sme_early_pgtable_flush();
+}
+
+void __init sme_map_bootdata(char *real_mode_data)
+{
+	/* If SME is not active, the bootdata is in the correct state */
+	if (!sme_active())
+		return;
+
+	/*
+	 * The bootdata and command line will not be encrypted, so they
+	 * need to be mapped as decrypted memory so they can be copied
+	 * properly.
+	 */
+	__sme_map_unmap_bootdata(real_mode_data, true);
+
+	sme_early_pgtable_flush();
+}
+
 void __init sme_early_init(void)
 {
 	unsigned int i;
