Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 931 insertions, 0 deletions

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
new file mode 100644
index 000000000..6453fbaed
--- /dev/null
+++ b/arch/x86/mm/ioremap.c
@@ -0,0 +1,931 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Re-map IO memory to kernel address space so that we can access it.
+ * This is needed for high PCI addresses that aren't mapped in the
+ * 640k-1MB IO memory area on PC's
+ *
+ * (C) Copyright 1995 1996 Linus Torvalds
+ */
+
+#include <linux/memblock.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/mmiotrace.h>
+#include <linux/cc_platform.h>
+#include <linux/efi.h>
+#include <linux/pgtable.h>
+#include <linux/kmsan.h>
+
+#include <asm/set_memory.h>
+#include <asm/e820/api.h>
+#include <asm/efi.h>
+#include <asm/fixmap.h>
+#include <asm/tlbflush.h>
+#include <asm/pgalloc.h>
+#include <asm/memtype.h>
+#include <asm/setup.h>
+
+#include "physaddr.h"
+
+/*
+ * Descriptor controlling ioremap() behavior.
+ */
+struct ioremap_desc {
+	unsigned int flags;
+};
+
+/*
+ * Fix up the linear direct mapping of the kernel to avoid cache attribute
+ * conflicts.
+ */
+int ioremap_change_attr(unsigned long vaddr, unsigned long size,
+			enum page_cache_mode pcm)
+{
+	unsigned long nrpages = size >> PAGE_SHIFT;
+	int err;
+
+	switch (pcm) {
+	case _PAGE_CACHE_MODE_UC:
+	default:
+		err = _set_memory_uc(vaddr, nrpages);
+		break;
+	case _PAGE_CACHE_MODE_WC:
+		err = _set_memory_wc(vaddr, nrpages);
+		break;
+	case _PAGE_CACHE_MODE_WT:
+		err = _set_memory_wt(vaddr, nrpages);
+		break;
+	case _PAGE_CACHE_MODE_WB:
+		err = _set_memory_wb(vaddr, nrpages);
+		break;
+	}
+
+	return err;
+}
+
+/* Does the range (or a subset of) contain normal RAM? */
+static unsigned int __ioremap_check_ram(struct resource *res)
+{
+	unsigned long start_pfn, stop_pfn;
+	unsigned long i;
+
+	if ((res->flags & IORESOURCE_SYSTEM_RAM) != IORESOURCE_SYSTEM_RAM)
+		return 0;
+
+	start_pfn = (res->start + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	stop_pfn = (res->end + 1) >> PAGE_SHIFT;
+	if (stop_pfn > start_pfn) {
+		for (i = 0; i < (stop_pfn - start_pfn); ++i)
+			if (pfn_valid(start_pfn + i) &&
+			    !PageReserved(pfn_to_page(start_pfn + i)))
+				return IORES_MAP_SYSTEM_RAM;
+	}
+
+	return 0;
+}
+
+/*
+ * In a SEV guest, NONE and RESERVED should not be mapped encrypted because
+ * there the whole memory is already encrypted.
+ */
+static unsigned int __ioremap_check_encrypted(struct resource *res)
+{
+	if (!cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+		return 0;
+
+	switch (res->desc) {
+	case IORES_DESC_NONE:
+	case IORES_DESC_RESERVED:
+		break;
+	default:
+		return IORES_MAP_ENCRYPTED;
+	}
+
+	return 0;
+}
+
+/*
+ * The EFI runtime services data area is not covered by walk_mem_res(), but must
+ * be mapped encrypted when SEV is active.
+ */
+static void __ioremap_check_other(resource_size_t addr, struct ioremap_desc *desc)
+{
+	if (!cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+		return;
+
+	if (!IS_ENABLED(CONFIG_EFI))
+		return;
+
+	if (efi_mem_type(addr) == EFI_RUNTIME_SERVICES_DATA ||
+	    (efi_mem_type(addr) == EFI_BOOT_SERVICES_DATA &&
+	     efi_mem_attributes(addr) & EFI_MEMORY_RUNTIME))
+		desc->flags |= IORES_MAP_ENCRYPTED;
+}
+
+static int __ioremap_collect_map_flags(struct resource *res, void *arg)
+{
+	struct ioremap_desc *desc = arg;
+
+	if (!(desc->flags & IORES_MAP_SYSTEM_RAM))
+		desc->flags |= __ioremap_check_ram(res);
+
+	if (!(desc->flags & IORES_MAP_ENCRYPTED))
+		desc->flags |= __ioremap_check_encrypted(res);
+
+	return ((desc->flags & (IORES_MAP_SYSTEM_RAM | IORES_MAP_ENCRYPTED)) ==
+			       (IORES_MAP_SYSTEM_RAM | IORES_MAP_ENCRYPTED));
+}
+
+/*
+ * To avoid multiple resource walks, this function walks resources marked as
+ * IORESOURCE_MEM and IORESOURCE_BUSY and looking for system RAM and/or a
+ * resource described not as IORES_DESC_NONE (e.g. IORES_DESC_ACPI_TABLES).
+ *
+ * After that, deal with misc other ranges in __ioremap_check_other() which do
+ * not fall into the above category.
+ */
+static void __ioremap_check_mem(resource_size_t addr, unsigned long size,
+				struct ioremap_desc *desc)
+{
+	u64 start, end;
+
+	start = (u64)addr;
+	end = start + size - 1;
+	memset(desc, 0, sizeof(struct ioremap_desc));
+
+	walk_mem_res(start, end, desc, __ioremap_collect_map_flags);
+
+	__ioremap_check_other(addr, desc);
+}
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. It transparently creates kernel huge I/O mapping when
+ * the physical address is aligned by a huge page size (1GB or 2MB) and
+ * the requested size is at least the huge page size.
+ *
+ * NOTE: MTRRs can override PAT memory types with a 4KB granularity.
+ * Therefore, the mapping code falls back to use a smaller page toward 4KB
+ * when a mapping range is covered by non-WB type of MTRRs.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+static void __iomem *
+__ioremap_caller(resource_size_t phys_addr, unsigned long size,
+		 enum page_cache_mode pcm, void *caller, bool encrypted)
+{
+	unsigned long offset, vaddr;
+	resource_size_t last_addr;
+	const resource_size_t unaligned_phys_addr = phys_addr;
+	const unsigned long unaligned_size = size;
+	struct ioremap_desc io_desc;
+	struct vm_struct *area;
+	enum page_cache_mode new_pcm;
+	pgprot_t prot;
+	int retval;
+	void __iomem *ret_addr;
+
+	/* Don't allow wraparound or zero size */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	if (!phys_addr_valid(phys_addr)) {
+		printk(KERN_WARNING "ioremap: invalid physical address %llx\n",
+		       (unsigned long long)phys_addr);
+		WARN_ON_ONCE(1);
+		return NULL;
+	}
+
+	__ioremap_check_mem(phys_addr, size, &io_desc);
+
+	/*
+	 * Don't allow anybody to remap normal RAM that we're using..
+	 */
+	if (io_desc.flags & IORES_MAP_SYSTEM_RAM) {
+		WARN_ONCE(1, "ioremap on RAM at %pa - %pa\n",
+			  &phys_addr, &last_addr);
+		return NULL;
+	}
+
+	/*
+	 * Mappings have to be page-aligned
+	 */
+	offset = phys_addr & ~PAGE_MASK;
+	phys_addr &= PAGE_MASK;
+	size = PAGE_ALIGN(last_addr+1) - phys_addr;
+
+	/*
+	 * Mask out any bits not part of the actual physical
+	 * address, like memory encryption bits.
+	 */
+	phys_addr &= PHYSICAL_PAGE_MASK;
+
+	retval = memtype_reserve(phys_addr, (u64)phys_addr + size,
+						pcm, &new_pcm);
+	if (retval) {
+		printk(KERN_ERR "ioremap memtype_reserve failed %d\n", retval);
+		return NULL;
+	}
+
+	if (pcm != new_pcm) {
+		if (!is_new_memtype_allowed(phys_addr, size, pcm, new_pcm)) {
+			printk(KERN_ERR
+		"ioremap error for 0x%llx-0x%llx, requested 0x%x, got 0x%x\n",
+				(unsigned long long)phys_addr,
+				(unsigned long long)(phys_addr + size),
+				pcm, new_pcm);
+			goto err_free_memtype;
+		}
+		pcm = new_pcm;
+	}
+
+	/*
+	 * If the page being mapped is in memory and SEV is active then
+	 * make sure the memory encryption attribute is enabled in the
+	 * resulting mapping.
+	 * In TDX guests, memory is marked private by default. If encryption
+	 * is not requested (using encrypted), explicitly set decrypt
+	 * attribute in all IOREMAPPED memory.
+	 */
+	prot = PAGE_KERNEL_IO;
+	if ((io_desc.flags & IORES_MAP_ENCRYPTED) || encrypted)
+		prot = pgprot_encrypted(prot);
+	else
+		prot = pgprot_decrypted(prot);
+
+	switch (pcm) {
+	case _PAGE_CACHE_MODE_UC:
+	default:
+		prot = __pgprot(pgprot_val(prot) |
+				cachemode2protval(_PAGE_CACHE_MODE_UC));
+		break;
+	case _PAGE_CACHE_MODE_UC_MINUS:
+		prot = __pgprot(pgprot_val(prot) |
+				cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS));
+		break;
+	case _PAGE_CACHE_MODE_WC:
+		prot = __pgprot(pgprot_val(prot) |
+				cachemode2protval(_PAGE_CACHE_MODE_WC));
+		break;
+	case _PAGE_CACHE_MODE_WT:
+		prot = __pgprot(pgprot_val(prot) |
+				cachemode2protval(_PAGE_CACHE_MODE_WT));
+		break;
+	case _PAGE_CACHE_MODE_WB:
+		break;
+	}
+
+	/*
+	 * Ok, go for it..
+	 */
+	area = get_vm_area_caller(size, VM_IOREMAP, caller);
+	if (!area)
+		goto err_free_memtype;
+	area->phys_addr = phys_addr;
+	vaddr = (unsigned long) area->addr;
+
+	if (memtype_kernel_map_sync(phys_addr, size, pcm))
+		goto err_free_area;
+
+	if (ioremap_page_range(vaddr, vaddr + size, phys_addr, prot))
+		goto err_free_area;
+
+	ret_addr = (void __iomem *) (vaddr + offset);
+	mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
+
+	/*
+	 * Check if the request spans more than any BAR in the iomem resource
+	 * tree.
+	 */
+	if (iomem_map_sanity_check(unaligned_phys_addr, unaligned_size))
+		pr_warn("caller %pS mapping multiple BARs\n", caller);
+
+	return ret_addr;
+err_free_area:
+	free_vm_area(area);
+err_free_memtype:
+	memtype_free(phys_addr, phys_addr + size);
+	return NULL;
+}
+
+/**
+ * ioremap     -   map bus memory into CPU space
+ * @phys_addr:    bus address of the memory
+ * @size:      size of the resource to map
+ *
+ * ioremap performs a platform specific sequence of operations to
+ * make bus memory CPU accessible via the readb/readw/readl/writeb/
+ * writew/writel functions and the other mmio helpers. The returned
+ * address is not guaranteed to be usable directly as a virtual
+ * address.
+ *
+ * This version of ioremap ensures that the memory is marked uncachable
+ * on the CPU as well as honouring existing caching rules from things like
+ * the PCI bus. Note that there are other caches and buffers on many
+ * busses. In particular driver authors should read up on PCI writes
+ *
+ * It's useful if some control registers are in such an area and
+ * write combining or read caching is not desirable:
+ *
+ * Must be freed with iounmap.
+ */
+void __iomem *ioremap(resource_size_t phys_addr, unsigned long size)
+{
+	/*
+	 * Ideally, this should be:
+	 *	pat_enabled() ? _PAGE_CACHE_MODE_UC : _PAGE_CACHE_MODE_UC_MINUS;
+	 *
+	 * Till we fix all X drivers to use ioremap_wc(), we will use
+	 * UC MINUS. Drivers that are certain they need or can already
+	 * be converted over to strong UC can use ioremap_uc().
+	 */
+	enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC_MINUS;
+
+	return __ioremap_caller(phys_addr, size, pcm,
+				__builtin_return_address(0), false);
+}
+EXPORT_SYMBOL(ioremap);
+
+/**
+ * ioremap_uc     -   map bus memory into CPU space as strongly uncachable
+ * @phys_addr:    bus address of the memory
+ * @size:      size of the resource to map
+ *
+ * ioremap_uc performs a platform specific sequence of operations to
+ * make bus memory CPU accessible via the readb/readw/readl/writeb/
+ * writew/writel functions and the other mmio helpers. The returned
+ * address is not guaranteed to be usable directly as a virtual
+ * address.
+ *
+ * This version of ioremap ensures that the memory is marked with a strong
+ * preference as completely uncachable on the CPU when possible. For non-PAT
+ * systems this ends up setting page-attribute flags PCD=1, PWT=1. For PAT
+ * systems this will set the PAT entry for the pages as strong UC.  This call
+ * will honor existing caching rules from things like the PCI bus. Note that
+ * there are other caches and buffers on many busses. In particular driver
+ * authors should read up on PCI writes.
+ *
+ * It's useful if some control registers are in such an area and
+ * write combining or read caching is not desirable:
+ *
+ * Must be freed with iounmap.
+ */
+void __iomem *ioremap_uc(resource_size_t phys_addr, unsigned long size)
+{
+	enum page_cache_mode pcm = _PAGE_CACHE_MODE_UC;
+
+	return __ioremap_caller(phys_addr, size, pcm,
+				__builtin_return_address(0), false);
+}
+EXPORT_SYMBOL_GPL(ioremap_uc);
+
+/**
+ * ioremap_wc	-	map memory into CPU space write combined
+ * @phys_addr:	bus address of the memory
+ * @size:	size of the resource to map
+ *
+ * This version of ioremap ensures that the memory is marked write combining.
+ * Write combining allows faster writes to some hardware devices.
+ *
+ * Must be freed with iounmap.
+ */
+void __iomem *ioremap_wc(resource_size_t phys_addr, unsigned long size)
+{
+	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WC,
+					__builtin_return_address(0), false);
+}
+EXPORT_SYMBOL(ioremap_wc);
+
+/**
+ * ioremap_wt	-	map memory into CPU space write through
+ * @phys_addr:	bus address of the memory
+ * @size:	size of the resource to map
+ *
+ * This version of ioremap ensures that the memory is marked write through.
+ * Write through stores data into memory while keeping the cache up-to-date.
+ *
+ * Must be freed with iounmap.
+ */
+void __iomem *ioremap_wt(resource_size_t phys_addr, unsigned long size)
+{
+	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WT,
+					__builtin_return_address(0), false);
+}
+EXPORT_SYMBOL(ioremap_wt);
+
+void __iomem *ioremap_encrypted(resource_size_t phys_addr, unsigned long size)
+{
+	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
+				__builtin_return_address(0), true);
+}
+EXPORT_SYMBOL(ioremap_encrypted);
+
+void __iomem *ioremap_cache(resource_size_t phys_addr, unsigned long size)
+{
+	return __ioremap_caller(phys_addr, size, _PAGE_CACHE_MODE_WB,
+				__builtin_return_address(0), false);
+}
+EXPORT_SYMBOL(ioremap_cache);
+
+void __iomem *ioremap_prot(resource_size_t phys_addr, unsigned long size,
+				unsigned long prot_val)
+{
+	return __ioremap_caller(phys_addr, size,
+				pgprot2cachemode(__pgprot(prot_val)),
+				__builtin_return_address(0), false);
+}
+EXPORT_SYMBOL(ioremap_prot);
+
+/**
+ * iounmap - Free a IO remapping
+ * @addr: virtual address from ioremap_*
+ *
+ * Caller must ensure there is only one unmapping for the same pointer.
+ */
+void iounmap(volatile void __iomem *addr)
+{
+	struct vm_struct *p, *o;
+
+	if ((void __force *)addr <= high_memory)
+		return;
+
+	/*
+	 * The PCI/ISA range special-casing was removed from __ioremap()
+	 * so this check, in theory, can be removed. However, there are
+	 * cases where iounmap() is called for addresses not obtained via
+	 * ioremap() (vga16fb for example). Add a warning so that these
+	 * cases can be caught and fixed.
+	 */
+	if ((void __force *)addr >= phys_to_virt(ISA_START_ADDRESS) &&
+	    (void __force *)addr < phys_to_virt(ISA_END_ADDRESS)) {
+		WARN(1, "iounmap() called for ISA range not obtained using ioremap()\n");
+		return;
+	}
+
+	mmiotrace_iounmap(addr);
+
+	addr = (volatile void __iomem *)
+		(PAGE_MASK & (unsigned long __force)addr);
+
+	/* Use the vm area unlocked, assuming the caller
+	   ensures there isn't another iounmap for the same address
+	   in parallel. Reuse of the virtual address is prevented by
+	   leaving it in the global lists until we're done with it.
+	   cpa takes care of the direct mappings. */
+	p = find_vm_area((void __force *)addr);
+
+	if (!p) {
+		printk(KERN_ERR "iounmap: bad address %p\n", addr);
+		dump_stack();
+		return;
+	}
+
+	kmsan_iounmap_page_range((unsigned long)addr,
+		(unsigned long)addr + get_vm_area_size(p));
+	memtype_free(p->phys_addr, p->phys_addr + get_vm_area_size(p));
+
+	/* Finally remove it */
+	o = remove_vm_area((void __force *)addr);
+	BUG_ON(p != o || o == NULL);
+	kfree(p);
+}
+EXPORT_SYMBOL(iounmap);
+
+/*
+ * Convert a physical pointer to a virtual kernel pointer for /dev/mem
+ * access
+ */
+void *xlate_dev_mem_ptr(phys_addr_t phys)
+{
+	unsigned long start  = phys &  PAGE_MASK;
+	unsigned long offset = phys & ~PAGE_MASK;
+	void *vaddr;
+
+	/* memremap() maps if RAM, otherwise falls back to ioremap() */
+	vaddr = memremap(start, PAGE_SIZE, MEMREMAP_WB);
+
+	/* Only add the offset on success and return NULL if memremap() failed */
+	if (vaddr)
+		vaddr += offset;
+
+	return vaddr;
+}
+
+void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
+{
+	memunmap((void *)((unsigned long)addr & PAGE_MASK));
+}
+
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+/*
+ * Examine the physical address to determine if it is an area of memory
+ * that should be mapped decrypted.  If the memory is not part of the
+ * kernel usable area it was accessed and created decrypted, so these
+ * areas should be mapped decrypted. And since the encryption key can
+ * change across reboots, persistent memory should also be mapped
+ * decrypted.
+ *
+ * If SEV is active, that implies that BIOS/UEFI also ran encrypted so
+ * only persistent memory should be mapped decrypted.
+ */
+static bool memremap_should_map_decrypted(resource_size_t phys_addr,
+					  unsigned long size)
+{
+	int is_pmem;
+
+	/*
+	 * Check if the address is part of a persistent memory region.
+	 * This check covers areas added by E820, EFI and ACPI.
+	 */
+	is_pmem = region_intersects(phys_addr, size, IORESOURCE_MEM,
+				    IORES_DESC_PERSISTENT_MEMORY);
+	if (is_pmem != REGION_DISJOINT)
+		return true;
+
+	/*
+	 * Check if the non-volatile attribute is set for an EFI
+	 * reserved area.
+	 */
+	if (efi_enabled(EFI_BOOT)) {
+		switch (efi_mem_type(phys_addr)) {
+		case EFI_RESERVED_TYPE:
+			if (efi_mem_attributes(phys_addr) & EFI_MEMORY_NV)
+				return true;
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* Check if the address is outside kernel usable area */
+	switch (e820__get_entry_type(phys_addr, phys_addr + size - 1)) {
+	case E820_TYPE_RESERVED:
+	case E820_TYPE_ACPI:
+	case E820_TYPE_NVS:
+	case E820_TYPE_UNUSABLE:
+		/* For SEV, these areas are encrypted */
+		if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+			break;
+		fallthrough;
+
+	case E820_TYPE_PRAM:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+/*
+ * Examine the physical address to determine if it is EFI data. Check
+ * it against the boot params structure and EFI tables and memory types.
+ */
+static bool memremap_is_efi_data(resource_size_t phys_addr,
+				 unsigned long size)
+{
+	u64 paddr;
+
+	/* Check if the address is part of EFI boot/runtime data */
+	if (!efi_enabled(EFI_BOOT))
+		return false;
+
+	paddr = boot_params.efi_info.efi_memmap_hi;
+	paddr <<= 32;
+	paddr |= boot_params.efi_info.efi_memmap;
+	if (phys_addr == paddr)
+		return true;
+
+	paddr = boot_params.efi_info.efi_systab_hi;
+	paddr <<= 32;
+	paddr |= boot_params.efi_info.efi_systab;
+	if (phys_addr == paddr)
+		return true;
+
+	if (efi_is_table_address(phys_addr))
+		return true;
+
+	switch (efi_mem_type(phys_addr)) {
+	case EFI_BOOT_SERVICES_DATA:
+	case EFI_RUNTIME_SERVICES_DATA:
+		return true;
+	default:
+		break;
+	}
+
+	return false;
+}
+
+/*
+ * Examine the physical address to determine if it is boot data by checking
+ * it against the boot params setup_data chain.
+ */
+static bool memremap_is_setup_data(resource_size_t phys_addr,
+				   unsigned long size)
+{
+	struct setup_indirect *indirect;
+	struct setup_data *data;
+	u64 paddr, paddr_next;
+
+	paddr = boot_params.hdr.setup_data;
+	while (paddr) {
+		unsigned int len;
+
+		if (phys_addr == paddr)
+			return true;
+
+		data = memremap(paddr, sizeof(*data),
+				MEMREMAP_WB | MEMREMAP_DEC);
+		if (!data) {
+			pr_warn("failed to memremap setup_data entry\n");
+			return false;
+		}
+
+		paddr_next = data->next;
+		len = data->len;
+
+		if ((phys_addr > paddr) && (phys_addr < (paddr + len))) {
+			memunmap(data);
+			return true;
+		}
+
+		if (data->type == SETUP_INDIRECT) {
+			memunmap(data);
+			data = memremap(paddr, sizeof(*data) + len,
+					MEMREMAP_WB | MEMREMAP_DEC);
+			if (!data) {
+				pr_warn("failed to memremap indirect setup_data\n");
+				return false;
+			}
+
+			indirect = (struct setup_indirect *)data->data;
+
+			if (indirect->type != SETUP_INDIRECT) {
+				paddr = indirect->addr;
+				len = indirect->len;
+			}
+		}
+
+		memunmap(data);
+
+		if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
+			return true;
+
+		paddr = paddr_next;
+	}
+
+	return false;
+}
+
+/*
+ * Examine the physical address to determine if it is boot data by checking
+ * it against the boot params setup_data chain (early boot version).
+ */
+static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
+						unsigned long size)
+{
+	struct setup_indirect *indirect;
+	struct setup_data *data;
+	u64 paddr, paddr_next;
+
+	paddr = boot_params.hdr.setup_data;
+	while (paddr) {
+		unsigned int len, size;
+
+		if (phys_addr == paddr)
+			return true;
+
+		data = early_memremap_decrypted(paddr, sizeof(*data));
+		if (!data) {
+			pr_warn("failed to early memremap setup_data entry\n");
+			return false;
+		}
+
+		size = sizeof(*data);
+
+		paddr_next = data->next;
+		len = data->len;
+
+		if ((phys_addr > paddr) && (phys_addr < (paddr + len))) {
+			early_memunmap(data, sizeof(*data));
+			return true;
+		}
+
+		if (data->type == SETUP_INDIRECT) {
+			size += len;
+			early_memunmap(data, sizeof(*data));
+			data = early_memremap_decrypted(paddr, size);
+			if (!data) {
+				pr_warn("failed to early memremap indirect setup_data\n");
+				return false;
+			}
+
+			indirect = (struct setup_indirect *)data->data;
+
+			if (indirect->type != SETUP_INDIRECT) {
+				paddr = indirect->addr;
+				len = indirect->len;
+			}
+		}
+
+		early_memunmap(data, size);
+
+		if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
+			return true;
+
+		paddr = paddr_next;
+	}
+
+	return false;
+}
+
+/*
+ * Architecture function to determine if RAM remap is allowed. By default, a
+ * RAM remap will map the data as encrypted. Determine if a RAM remap should
+ * not be done so that the data will be mapped decrypted.
+ */
+bool arch_memremap_can_ram_remap(resource_size_t phys_addr, unsigned long size,
+				 unsigned long flags)
+{
+	if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
+		return true;
+
+	if (flags & MEMREMAP_ENC)
+		return true;
+
+	if (flags & MEMREMAP_DEC)
+		return false;
+
+	if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) {
+		if (memremap_is_setup_data(phys_addr, size) ||
+		    memremap_is_efi_data(phys_addr, size))
+			return false;
+	}
+
+	return !memremap_should_map_decrypted(phys_addr, size);
+}
+
+/*
+ * Architecture override of __weak function to adjust the protection attributes
+ * used when remapping memory. By default, early_memremap() will map the data
+ * as encrypted. Determine if an encrypted mapping should not be done and set
+ * the appropriate protection attributes.
+ */
+pgprot_t __init early_memremap_pgprot_adjust(resource_size_t phys_addr,
+					     unsigned long size,
+					     pgprot_t prot)
+{
+	bool encrypted_prot;
+
+	if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
+		return prot;
+
+	encrypted_prot = true;
+
+	if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT)) {
+		if (early_memremap_is_setup_data(phys_addr, size) ||
+		    memremap_is_efi_data(phys_addr, size))
+			encrypted_prot = false;
+	}
+
+	if (encrypted_prot && memremap_should_map_decrypted(phys_addr, size))
+		encrypted_prot = false;
+
+	return encrypted_prot ? pgprot_encrypted(prot)
+			      : pgprot_decrypted(prot);
+}
+
+bool phys_mem_access_encrypted(unsigned long phys_addr, unsigned long size)
+{
+	return arch_memremap_can_ram_remap(phys_addr, size, 0);
+}
+
+/* Remap memory with encryption */
+void __init *early_memremap_encrypted(resource_size_t phys_addr,
+				      unsigned long size)
+{
+	return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_ENC);
+}
+
+/*
+ * Remap memory with encryption and write-protected - cannot be called
+ * before pat_init() is called
+ */
+void __init *early_memremap_encrypted_wp(resource_size_t phys_addr,
+					 unsigned long size)
+{
+	if (!x86_has_pat_wp())
+		return NULL;
+	return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_ENC_WP);
+}
+
+/* Remap memory without encryption */
+void __init *early_memremap_decrypted(resource_size_t phys_addr,
+				      unsigned long size)
+{
+	return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_NOENC);
+}
+
+/*
+ * Remap memory without encryption and write-protected - cannot be called
+ * before pat_init() is called
+ */
+void __init *early_memremap_decrypted_wp(resource_size_t phys_addr,
+					 unsigned long size)
+{
+	if (!x86_has_pat_wp())
+		return NULL;
+	return early_memremap_prot(phys_addr, size, __PAGE_KERNEL_NOENC_WP);
+}
+#endif	/* CONFIG_AMD_MEM_ENCRYPT */
+
+static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss;
+
+static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
+{
+	/* Don't assume we're using swapper_pg_dir at this point */
+	pgd_t *base = __va(read_cr3_pa());
+	pgd_t *pgd = &base[pgd_index(addr)];
+	p4d_t *p4d = p4d_offset(pgd, addr);
+	pud_t *pud = pud_offset(p4d, addr);
+	pmd_t *pmd = pmd_offset(pud, addr);
+
+	return pmd;
+}
+
+static inline pte_t * __init early_ioremap_pte(unsigned long addr)
+{
+	return &bm_pte[pte_index(addr)];
+}
+
+bool __init is_early_ioremap_ptep(pte_t *ptep)
+{
+	return ptep >= &bm_pte[0] && ptep < &bm_pte[PAGE_SIZE/sizeof(pte_t)];
+}
+
+void __init early_ioremap_init(void)
+{
+	pmd_t *pmd;
+
+#ifdef CONFIG_X86_64
+	BUILD_BUG_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1));
+#else
+	WARN_ON((fix_to_virt(0) + PAGE_SIZE) & ((1 << PMD_SHIFT) - 1));
+#endif
+
+	early_ioremap_setup();
+
+	pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
+	memset(bm_pte, 0, sizeof(bm_pte));
+	pmd_populate_kernel(&init_mm, pmd, bm_pte);
+
+	/*
+	 * The boot-ioremap range spans multiple pmds, for which
+	 * we are not prepared:
+	 */
+#define __FIXADDR_TOP (-PAGE_SIZE)
+	BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
+		     != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
+#undef __FIXADDR_TOP
+	if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) {
+		WARN_ON(1);
+		printk(KERN_WARNING "pmd %p != %p\n",
+		       pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END)));
+		printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
+			fix_to_virt(FIX_BTMAP_BEGIN));
+		printk(KERN_WARNING "fix_to_virt(FIX_BTMAP_END):   %08lx\n",
+			fix_to_virt(FIX_BTMAP_END));
+
+		printk(KERN_WARNING "FIX_BTMAP_END:       %d\n", FIX_BTMAP_END);
+		printk(KERN_WARNING "FIX_BTMAP_BEGIN:     %d\n",
+		       FIX_BTMAP_BEGIN);
+	}
+}
+
+void __init __early_set_fixmap(enum fixed_addresses idx,
+			       phys_addr_t phys, pgprot_t flags)
+{
+	unsigned long addr = __fix_to_virt(idx);
+	pte_t *pte;
+
+	if (idx >= __end_of_fixed_addresses) {
+		BUG();
+		return;
+	}
+	pte = early_ioremap_pte(addr);
+
+	/* Sanitize 'prot' against any unsupported bits: */
+	pgprot_val(flags) &= __supported_pte_mask;
+
+	if (pgprot_val(flags))
+		set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
+	else
+		pte_clear(&init_mm, addr, pte);
+	flush_tlb_one_kernel(addr);
+}