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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/kernel/machine_kexec_64.c
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@@ -1,9 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * handle transition of Linux booting another kernel
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  * Copyright (C) 2002-2005 Eric Biederman  <ebiederm@xmission.com>
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- *
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- * This source code is licensed under the GNU General Public License,
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- * Version 2.  See the file COPYING for more details.
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  */
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6
 
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 #define pr_fmt(fmt)	"kexec: " fmt
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@@ -18,9 +16,9 @@
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 #include <linux/io.h>
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 #include <linux/suspend.h>
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 #include <linux/vmalloc.h>
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+#include <linux/efi.h>
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20
 
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 #include <asm/init.h>
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-#include <asm/pgtable.h>
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 #include <asm/tlbflush.h>
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 #include <asm/mmu_context.h>
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 #include <asm/io_apic.h>
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@@ -29,12 +27,86 @@
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 #include <asm/setup.h>
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 #include <asm/set_memory.h>
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29
 
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+#ifdef CONFIG_ACPI
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+/*
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+ * Used while adding mapping for ACPI tables.
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+ * Can be reused when other iomem regions need be mapped
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+ */
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+struct init_pgtable_data {
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+	struct x86_mapping_info *info;
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+	pgd_t *level4p;
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+};
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+
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+static int mem_region_callback(struct resource *res, void *arg)
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+{
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+	struct init_pgtable_data *data = arg;
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+	unsigned long mstart, mend;
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+
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+	mstart = res->start;
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+	mend = mstart + resource_size(res) - 1;
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+
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+	return kernel_ident_mapping_init(data->info, data->level4p, mstart, mend);
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+}
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+
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+static int
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+map_acpi_tables(struct x86_mapping_info *info, pgd_t *level4p)
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+{
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+	struct init_pgtable_data data;
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+	unsigned long flags;
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+	int ret;
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+
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+	data.info = info;
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+	data.level4p = level4p;
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+	flags = IORESOURCE_MEM | IORESOURCE_BUSY;
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+
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+	ret = walk_iomem_res_desc(IORES_DESC_ACPI_TABLES, flags, 0, -1,
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+				  &data, mem_region_callback);
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+	if (ret && ret != -EINVAL)
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+		return ret;
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+
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+	/* ACPI tables could be located in ACPI Non-volatile Storage region */
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+	ret = walk_iomem_res_desc(IORES_DESC_ACPI_NV_STORAGE, flags, 0, -1,
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+				  &data, mem_region_callback);
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+	if (ret && ret != -EINVAL)
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+		return ret;
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+
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+	return 0;
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+}
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+#else
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+static int map_acpi_tables(struct x86_mapping_info *info, pgd_t *level4p) { return 0; }
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+#endif
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+
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 #ifdef CONFIG_KEXEC_FILE
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 const struct kexec_file_ops * const kexec_file_loaders[] = {
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 		&kexec_bzImage64_ops,
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 		NULL
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 };
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 #endif
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+
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+static int
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+map_efi_systab(struct x86_mapping_info *info, pgd_t *level4p)
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+{
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+#ifdef CONFIG_EFI
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+	unsigned long mstart, mend;
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+
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+	if (!efi_enabled(EFI_BOOT))
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+		return 0;
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+
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+	mstart = (boot_params.efi_info.efi_systab |
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+			((u64)boot_params.efi_info.efi_systab_hi<<32));
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+
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+	if (efi_enabled(EFI_64BIT))
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+		mend = mstart + sizeof(efi_system_table_64_t);
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+	else
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+		mend = mstart + sizeof(efi_system_table_32_t);
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+
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+	if (!mstart)
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+		return 0;
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+
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+	return kernel_ident_mapping_init(info, level4p, mstart, mend);
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+#endif
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+	return 0;
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+}
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110
 
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 static void free_transition_pgtable(struct kimage *image)
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 {
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@@ -50,12 +122,13 @@
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122
 
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 static int init_transition_pgtable(struct kimage *image, pgd_t *pgd)
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 {
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+	pgprot_t prot = PAGE_KERNEL_EXEC_NOENC;
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+	unsigned long vaddr, paddr;
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+	int result = -ENOMEM;
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 	p4d_t *p4d;
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 	pud_t *pud;
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 	pmd_t *pmd;
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 	pte_t *pte;
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-	unsigned long vaddr, paddr;
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-	int result = -ENOMEM;
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132
 
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 	vaddr = (unsigned long)relocate_kernel;
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 	paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE);
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@@ -92,7 +165,11 @@
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 		set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE));
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 	}
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 	pte = pte_offset_kernel(pmd, vaddr);
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-	set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC_NOENC));
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+
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+	if (sev_active())
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+		prot = PAGE_KERNEL_EXEC;
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+
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+	set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, prot));
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 	return 0;
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 err:
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 	return result;
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@@ -129,6 +206,11 @@
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 	level4p = (pgd_t *)__va(start_pgtable);
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 	clear_page(level4p);
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208
 
209
+	if (sev_active()) {
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+		info.page_flag   |= _PAGE_ENC;
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+		info.kernpg_flag |= _PAGE_ENC;
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+	}
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+
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 	if (direct_gbpages)
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215
 		info.direct_gbpages = true;
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216
 
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@@ -158,6 +240,18 @@
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 		if (result)
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 			return result;
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 	}
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+
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+	/*
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+	 * Prepare EFI systab and ACPI tables for kexec kernel since they are
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+	 * not covered by pfn_mapped.
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+	 */
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+	result = map_efi_systab(&info, level4p);
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+	if (result)
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+		return result;
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+
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+	result = map_acpi_tables(&info, level4p);
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+	if (result)
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+		return result;
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 	return init_transition_pgtable(image, level4p);
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257
 }
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@@ -203,48 +297,6 @@
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 		);
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 }
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299
 
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-#ifdef CONFIG_KEXEC_FILE
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-/* Update purgatory as needed after various image segments have been prepared */
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-static int arch_update_purgatory(struct kimage *image)
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-{
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-	int ret = 0;
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-
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-	if (!image->file_mode)
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-		return 0;
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-
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-	/* Setup copying of backup region */
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-	if (image->type == KEXEC_TYPE_CRASH) {
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-		ret = kexec_purgatory_get_set_symbol(image,
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-				"purgatory_backup_dest",
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-				&image->arch.backup_load_addr,
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-				sizeof(image->arch.backup_load_addr), 0);
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-		if (ret)
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-			return ret;
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-
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-		ret = kexec_purgatory_get_set_symbol(image,
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-				"purgatory_backup_src",
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-				&image->arch.backup_src_start,
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-				sizeof(image->arch.backup_src_start), 0);
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-		if (ret)
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-			return ret;
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-
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-		ret = kexec_purgatory_get_set_symbol(image,
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-				"purgatory_backup_sz",
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-				&image->arch.backup_src_sz,
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-				sizeof(image->arch.backup_src_sz), 0);
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-		if (ret)
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-			return ret;
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-	}
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-
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-	return ret;
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-}
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-#else /* !CONFIG_KEXEC_FILE */
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-static inline int arch_update_purgatory(struct kimage *image)
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-{
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-	return 0;
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-}
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-#endif /* CONFIG_KEXEC_FILE */
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-
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 int machine_kexec_prepare(struct kimage *image)
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 {
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 	unsigned long start_pgtable;
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@@ -255,11 +307,6 @@
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307
 
256
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 	/* Setup the identity mapped 64bit page table */
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 	result = init_pgtable(image, start_pgtable);
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-	if (result)
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-		return result;
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-
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-	/* update purgatory as needed */
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-	result = arch_update_purgatory(image);
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 	if (result)
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 		return result;
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312
 
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@@ -348,22 +395,6 @@
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 #endif
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396
 
350
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 	__ftrace_enabled_restore(save_ftrace_enabled);
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-}
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-
353
-void arch_crash_save_vmcoreinfo(void)
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-{
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-	VMCOREINFO_NUMBER(phys_base);
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-	VMCOREINFO_SYMBOL(init_top_pgt);
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-	vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n",
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-			pgtable_l5_enabled());
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-
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-#ifdef CONFIG_NUMA
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-	VMCOREINFO_SYMBOL(node_data);
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-	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
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-#endif
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-	vmcoreinfo_append_str("KERNELOFFSET=%lx\n",
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-			      kaslr_offset());
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-	VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE);
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398
 }
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399
 
369
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 /* arch-dependent functionality related to kexec file-based syscall */
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@@ -556,8 +587,20 @@
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 	kexec_mark_crashkres(false);
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588
 }
558
589
 
590
+/*
591
+ * During a traditional boot under SME, SME will encrypt the kernel,
592
+ * so the SME kexec kernel also needs to be un-encrypted in order to
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+ * replicate a normal SME boot.
594
+ *
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+ * During a traditional boot under SEV, the kernel has already been
596
+ * loaded encrypted, so the SEV kexec kernel needs to be encrypted in
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+ * order to replicate a normal SEV boot.
598
+ */
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599
 int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp)
560
600
 {
601
+	if (sev_active())
602
+		return 0;
603
+
561
604
 	/*
562
605
 	 * If SME is active we need to be sure that kexec pages are
563
606
 	 * not encrypted because when we boot to the new kernel the
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@@ -568,6 +611,9 @@
568
611
 
569
612
 void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages)
570
613
 {
614
+	if (sev_active())
615
+		return;
616
+
571
617
 	/*
572
618
 	 * If SME is active we need to reset the pages back to being
573
619
 	 * an encrypted mapping before freeing them.