Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Cleanup of the GOP [graphics output] handling code in the EFI stub

   - Complete refactoring of the mixed mode handling in the x86 EFI stub

   - Overhaul of the x86 EFI boot/runtime code

   - Increase robustness for mixed mode code

   - Add the ability to disable DMA at the root port level in the EFI
     stub

   - Get rid of RWX mappings in the EFI memory map and page tables,
     where possible

   - Move the support code for the old EFI memory mapping style into its
     only user, the SGI UV1+ support code.

   - plus misc fixes, updates, smaller cleanups.

  ... and due to interactions with the RWX changes, another round of PAT
  cleanups make a guest appearance via the EFI tree - with no side
  effects intended"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (75 commits)
  efi/x86: Disable instrumentation in the EFI runtime handling code
  efi/libstub/x86: Fix EFI server boot failure
  efi/x86: Disallow efi=old_map in mixed mode
  x86/boot/compressed: Relax sed symbol type regex for LLVM ld.lld
  efi/x86: avoid KASAN false positives when accessing the 1: 1 mapping
  efi: Fix handling of multiple efi_fake_mem= entries
  efi: Fix efi_memmap_alloc() leaks
  efi: Add tracking for dynamically allocated memmaps
  efi: Add a flags parameter to efi_memory_map
  efi: Fix comment for efi_mem_type() wrt absent physical addresses
  efi/arm: Defer probe of PCIe backed efifb on DT systems
  efi/x86: Limit EFI old memory map to SGI UV machines
  efi/x86: Avoid RWX mappings for all of DRAM
  efi/x86: Don't map the entire kernel text RW for mixed mode
  x86/mm: Fix NX bit clearing issue in kernel_map_pages_in_pgd
  efi/libstub/x86: Fix unused-variable warning
  efi/libstub/x86: Use mandatory 16-byte stack alignment in mixed mode
  efi/libstub/x86: Use const attribute for efi_is_64bit()
  efi: Allow disabling PCI busmastering on bridges during boot
  efi/x86: Allow translating 64-bit arguments for mixed mode calls
  ...

1 files changed, 24 insertions, 22 deletions

diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c
index ab91218d27bd..88d32c06cffa 100644
--- a/arch/x86/platform/efi/quirks.c
+++ b/arch/x86/platform/efi/quirks.c
@@ -244,7 +244,7 @@ EXPORT_SYMBOL_GPL(efi_query_variable_store);
  */
 void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
 {
-	phys_addr_t new_phys, new_size;
+	struct efi_memory_map_data data = { 0 };
 	struct efi_mem_range mr;
 	efi_memory_desc_t md;
 	int num_entries;
@@ -272,24 +272,21 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size)
 	num_entries = efi_memmap_split_count(&md, &mr.range);
 	num_entries += efi.memmap.nr_map;
 
-	new_size = efi.memmap.desc_size * num_entries;
-
-	new_phys = efi_memmap_alloc(num_entries);
-	if (!new_phys) {
+	if (efi_memmap_alloc(num_entries, &data) != 0) {
 		pr_err("Could not allocate boot services memmap\n");
 		return;
 	}
 
-	new = early_memremap(new_phys, new_size);
+	new = early_memremap(data.phys_map, data.size);
 	if (!new) {
 		pr_err("Failed to map new boot services memmap\n");
 		return;
 	}
 
 	efi_memmap_insert(&efi.memmap, new, &mr);
-	early_memunmap(new, new_size);
+	early_memunmap(new, data.size);
 
-	efi_memmap_install(new_phys, num_entries);
+	efi_memmap_install(&data);
 	e820__range_update(addr, size, E820_TYPE_RAM, E820_TYPE_RESERVED);
 	e820__update_table(e820_table);
 }
@@ -385,10 +382,10 @@ static void __init efi_unmap_pages(efi_memory_desc_t *md)
 
 	/*
 	 * To Do: Remove this check after adding functionality to unmap EFI boot
-	 * services code/data regions from direct mapping area because
-	 * "efi=old_map" maps EFI regions in swapper_pg_dir.
+	 * services code/data regions from direct mapping area because the UV1
+	 * memory map maps EFI regions in swapper_pg_dir.
 	 */
-	if (efi_enabled(EFI_OLD_MEMMAP))
+	if (efi_have_uv1_memmap())
 		return;
 
 	/*
@@ -396,7 +393,7 @@ static void __init efi_unmap_pages(efi_memory_desc_t *md)
 	 * EFI runtime calls, hence don't unmap EFI boot services code/data
 	 * regions.
 	 */
-	if (!efi_is_native())
+	if (efi_is_mixed())
 		return;
 
 	if (kernel_unmap_pages_in_pgd(pgd, pa, md->num_pages))
@@ -408,7 +405,7 @@ static void __init efi_unmap_pages(efi_memory_desc_t *md)
 
 void __init efi_free_boot_services(void)
 {
-	phys_addr_t new_phys, new_size;
+	struct efi_memory_map_data data = { 0 };
 	efi_memory_desc_t *md;
 	int num_entries = 0;
 	void *new, *new_md;
@@ -463,14 +460,12 @@ void __init efi_free_boot_services(void)
 	if (!num_entries)
 		return;
 
-	new_size = efi.memmap.desc_size * num_entries;
-	new_phys = efi_memmap_alloc(num_entries);
-	if (!new_phys) {
+	if (efi_memmap_alloc(num_entries, &data) != 0) {
 		pr_err("Failed to allocate new EFI memmap\n");
 		return;
 	}
 
-	new = memremap(new_phys, new_size, MEMREMAP_WB);
+	new = memremap(data.phys_map, data.size, MEMREMAP_WB);
 	if (!new) {
 		pr_err("Failed to map new EFI memmap\n");
 		return;
@@ -494,7 +489,7 @@ void __init efi_free_boot_services(void)
 
 	memunmap(new);
 
-	if (efi_memmap_install(new_phys, num_entries)) {
+	if (efi_memmap_install(&data) != 0) {
 		pr_err("Could not install new EFI memmap\n");
 		return;
 	}
@@ -559,7 +554,7 @@ out:
 	return ret;
 }
 
-static const struct dmi_system_id sgi_uv1_dmi[] = {
+static const struct dmi_system_id sgi_uv1_dmi[] __initconst = {
 	{ NULL, "SGI UV1",
 		{	DMI_MATCH(DMI_PRODUCT_NAME,	"Stoutland Platform"),
 			DMI_MATCH(DMI_PRODUCT_VERSION,	"1.0"),
@@ -582,8 +577,15 @@ void __init efi_apply_memmap_quirks(void)
 	}
 
 	/* UV2+ BIOS has a fix for this issue.  UV1 still needs the quirk. */
-	if (dmi_check_system(sgi_uv1_dmi))
-		set_bit(EFI_OLD_MEMMAP, &efi.flags);
+	if (dmi_check_system(sgi_uv1_dmi)) {
+		if (IS_ENABLED(CONFIG_X86_UV)) {
+			set_bit(EFI_UV1_MEMMAP, &efi.flags);
+		} else {
+			pr_warn("EFI runtime disabled, needs CONFIG_X86_UV=y on UV1\n");
+			clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+			efi_memmap_unmap();
+		}
+	}
 }
 
 /*
@@ -721,7 +723,7 @@ void efi_recover_from_page_fault(unsigned long phys_addr)
 	/*
 	 * Make sure that an efi runtime service caused the page fault.
 	 * "efi_mm" cannot be used to check if the page fault had occurred
-	 * in the firmware context because efi=old_map doesn't use efi_pgd.
+	 * in the firmware context because the UV1 memmap doesn't use efi_pgd.
 	 */
 	if (efi_rts_work.efi_rts_id == EFI_NONE)
 		return;