Merge branch 'x86/mm' into efi/core
This commit in x86/mm changed EFI code:
116fef6408
: x86/mm/dump_pagetables: Add the EFI pagetable to the debugfs 'page_tables' directory
So merge in that commit plus its dependencies, before continuing with
EFI work.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
commit
b0599e2801
|
@ -22,6 +22,7 @@
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|||
#ifdef CONFIG_AMD_MEM_ENCRYPT
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extern u64 sme_me_mask;
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extern bool sev_enabled;
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void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
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unsigned long decrypted_kernel_vaddr,
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|
|
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@ -1,12 +1,15 @@
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# SPDX-License-Identifier: GPL-2.0
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# Kernel does not boot with instrumentation of tlb.c and mem_encrypt.c
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KCOV_INSTRUMENT_tlb.o := n
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KCOV_INSTRUMENT_mem_encrypt.o := n
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# Kernel does not boot with instrumentation of tlb.c and mem_encrypt*.c
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KCOV_INSTRUMENT_tlb.o := n
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KCOV_INSTRUMENT_mem_encrypt.o := n
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KCOV_INSTRUMENT_mem_encrypt_identity.o := n
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KASAN_SANITIZE_mem_encrypt.o := n
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KASAN_SANITIZE_mem_encrypt.o := n
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KASAN_SANITIZE_mem_encrypt_identity.o := n
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_mem_encrypt.o = -pg
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CFLAGS_REMOVE_mem_encrypt.o = -pg
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CFLAGS_REMOVE_mem_encrypt_identity.o = -pg
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endif
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obj-y := init.o init_$(BITS).o fault.o ioremap.o extable.o pageattr.o mmap.o \
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@ -47,4 +50,5 @@ obj-$(CONFIG_RANDOMIZE_MEMORY) += kaslr.o
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obj-$(CONFIG_PAGE_TABLE_ISOLATION) += pti.o
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obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt.o
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obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_identity.o
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obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_boot.o
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|
|
|
@ -72,6 +72,31 @@ static const struct file_operations ptdump_curusr_fops = {
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};
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#endif
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#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
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extern pgd_t *efi_pgd;
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static struct dentry *pe_efi;
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static int ptdump_show_efi(struct seq_file *m, void *v)
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{
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if (efi_pgd)
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ptdump_walk_pgd_level_debugfs(m, efi_pgd, false);
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return 0;
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}
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static int ptdump_open_efi(struct inode *inode, struct file *filp)
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{
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return single_open(filp, ptdump_show_efi, NULL);
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}
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static const struct file_operations ptdump_efi_fops = {
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.owner = THIS_MODULE,
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.open = ptdump_open_efi,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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#endif
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static struct dentry *dir, *pe_knl, *pe_curknl;
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static int __init pt_dump_debug_init(void)
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@ -96,6 +121,13 @@ static int __init pt_dump_debug_init(void)
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if (!pe_curusr)
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goto err;
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#endif
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#if defined(CONFIG_EFI) && defined(CONFIG_X86_64)
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pe_efi = debugfs_create_file("efi", 0400, dir, NULL, &ptdump_efi_fops);
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if (!pe_efi)
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goto err;
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#endif
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return 0;
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err:
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debugfs_remove_recursive(dir);
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|
|
|
@ -25,17 +25,12 @@
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#include <asm/bootparam.h>
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#include <asm/set_memory.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include <asm/processor-flags.h>
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#include <asm/msr.h>
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#include <asm/cmdline.h>
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#include "mm_internal.h"
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static char sme_cmdline_arg[] __initdata = "mem_encrypt";
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static char sme_cmdline_on[] __initdata = "on";
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static char sme_cmdline_off[] __initdata = "off";
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/*
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* Since SME related variables are set early in the boot process they must
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* reside in the .data section so as not to be zeroed out when the .bss
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|
@ -46,7 +41,7 @@ EXPORT_SYMBOL(sme_me_mask);
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DEFINE_STATIC_KEY_FALSE(sev_enable_key);
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EXPORT_SYMBOL_GPL(sev_enable_key);
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static bool sev_enabled __section(.data);
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bool sev_enabled __section(.data);
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/* Buffer used for early in-place encryption by BSP, no locking needed */
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static char sme_early_buffer[PAGE_SIZE] __aligned(PAGE_SIZE);
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|
@ -463,574 +458,3 @@ void swiotlb_set_mem_attributes(void *vaddr, unsigned long size)
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/* Make the SWIOTLB buffer area decrypted */
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set_memory_decrypted((unsigned long)vaddr, size >> PAGE_SHIFT);
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}
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struct sme_populate_pgd_data {
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void *pgtable_area;
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pgd_t *pgd;
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pmdval_t pmd_flags;
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pteval_t pte_flags;
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unsigned long paddr;
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unsigned long vaddr;
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unsigned long vaddr_end;
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};
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static void __init sme_clear_pgd(struct sme_populate_pgd_data *ppd)
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{
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unsigned long pgd_start, pgd_end, pgd_size;
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pgd_t *pgd_p;
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pgd_start = ppd->vaddr & PGDIR_MASK;
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pgd_end = ppd->vaddr_end & PGDIR_MASK;
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pgd_size = (((pgd_end - pgd_start) / PGDIR_SIZE) + 1) * sizeof(pgd_t);
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pgd_p = ppd->pgd + pgd_index(ppd->vaddr);
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memset(pgd_p, 0, pgd_size);
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}
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#define PGD_FLAGS _KERNPG_TABLE_NOENC
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#define P4D_FLAGS _KERNPG_TABLE_NOENC
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#define PUD_FLAGS _KERNPG_TABLE_NOENC
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#define PMD_FLAGS _KERNPG_TABLE_NOENC
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#define PMD_FLAGS_LARGE (__PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL)
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#define PMD_FLAGS_DEC PMD_FLAGS_LARGE
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#define PMD_FLAGS_DEC_WP ((PMD_FLAGS_DEC & ~_PAGE_CACHE_MASK) | \
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(_PAGE_PAT | _PAGE_PWT))
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#define PMD_FLAGS_ENC (PMD_FLAGS_LARGE | _PAGE_ENC)
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#define PTE_FLAGS (__PAGE_KERNEL_EXEC & ~_PAGE_GLOBAL)
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#define PTE_FLAGS_DEC PTE_FLAGS
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#define PTE_FLAGS_DEC_WP ((PTE_FLAGS_DEC & ~_PAGE_CACHE_MASK) | \
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(_PAGE_PAT | _PAGE_PWT))
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#define PTE_FLAGS_ENC (PTE_FLAGS | _PAGE_ENC)
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static pmd_t __init *sme_prepare_pgd(struct sme_populate_pgd_data *ppd)
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{
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pgd_t *pgd_p;
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p4d_t *p4d_p;
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pud_t *pud_p;
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pmd_t *pmd_p;
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pgd_p = ppd->pgd + pgd_index(ppd->vaddr);
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if (native_pgd_val(*pgd_p)) {
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if (IS_ENABLED(CONFIG_X86_5LEVEL))
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p4d_p = (p4d_t *)(native_pgd_val(*pgd_p) & ~PTE_FLAGS_MASK);
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else
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pud_p = (pud_t *)(native_pgd_val(*pgd_p) & ~PTE_FLAGS_MASK);
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} else {
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pgd_t pgd;
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if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
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p4d_p = ppd->pgtable_area;
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memset(p4d_p, 0, sizeof(*p4d_p) * PTRS_PER_P4D);
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ppd->pgtable_area += sizeof(*p4d_p) * PTRS_PER_P4D;
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pgd = native_make_pgd((pgdval_t)p4d_p + PGD_FLAGS);
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} else {
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pud_p = ppd->pgtable_area;
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memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD);
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ppd->pgtable_area += sizeof(*pud_p) * PTRS_PER_PUD;
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pgd = native_make_pgd((pgdval_t)pud_p + PGD_FLAGS);
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}
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native_set_pgd(pgd_p, pgd);
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}
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if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
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p4d_p += p4d_index(ppd->vaddr);
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if (native_p4d_val(*p4d_p)) {
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pud_p = (pud_t *)(native_p4d_val(*p4d_p) & ~PTE_FLAGS_MASK);
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} else {
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p4d_t p4d;
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pud_p = ppd->pgtable_area;
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memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD);
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ppd->pgtable_area += sizeof(*pud_p) * PTRS_PER_PUD;
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p4d = native_make_p4d((pudval_t)pud_p + P4D_FLAGS);
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native_set_p4d(p4d_p, p4d);
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}
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}
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pud_p += pud_index(ppd->vaddr);
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if (native_pud_val(*pud_p)) {
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if (native_pud_val(*pud_p) & _PAGE_PSE)
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return NULL;
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pmd_p = (pmd_t *)(native_pud_val(*pud_p) & ~PTE_FLAGS_MASK);
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} else {
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pud_t pud;
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|
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pmd_p = ppd->pgtable_area;
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memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD);
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ppd->pgtable_area += sizeof(*pmd_p) * PTRS_PER_PMD;
|
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|
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pud = native_make_pud((pmdval_t)pmd_p + PUD_FLAGS);
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native_set_pud(pud_p, pud);
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}
|
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|
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return pmd_p;
|
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}
|
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|
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static void __init sme_populate_pgd_large(struct sme_populate_pgd_data *ppd)
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{
|
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pmd_t *pmd_p;
|
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|
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pmd_p = sme_prepare_pgd(ppd);
|
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if (!pmd_p)
|
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return;
|
||||
|
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pmd_p += pmd_index(ppd->vaddr);
|
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if (!native_pmd_val(*pmd_p) || !(native_pmd_val(*pmd_p) & _PAGE_PSE))
|
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native_set_pmd(pmd_p, native_make_pmd(ppd->paddr | ppd->pmd_flags));
|
||||
}
|
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|
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static void __init sme_populate_pgd(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
pmd_t *pmd_p;
|
||||
pte_t *pte_p;
|
||||
|
||||
pmd_p = sme_prepare_pgd(ppd);
|
||||
if (!pmd_p)
|
||||
return;
|
||||
|
||||
pmd_p += pmd_index(ppd->vaddr);
|
||||
if (native_pmd_val(*pmd_p)) {
|
||||
if (native_pmd_val(*pmd_p) & _PAGE_PSE)
|
||||
return;
|
||||
|
||||
pte_p = (pte_t *)(native_pmd_val(*pmd_p) & ~PTE_FLAGS_MASK);
|
||||
} else {
|
||||
pmd_t pmd;
|
||||
|
||||
pte_p = ppd->pgtable_area;
|
||||
memset(pte_p, 0, sizeof(*pte_p) * PTRS_PER_PTE);
|
||||
ppd->pgtable_area += sizeof(*pte_p) * PTRS_PER_PTE;
|
||||
|
||||
pmd = native_make_pmd((pteval_t)pte_p + PMD_FLAGS);
|
||||
native_set_pmd(pmd_p, pmd);
|
||||
}
|
||||
|
||||
pte_p += pte_index(ppd->vaddr);
|
||||
if (!native_pte_val(*pte_p))
|
||||
native_set_pte(pte_p, native_make_pte(ppd->paddr | ppd->pte_flags));
|
||||
}
|
||||
|
||||
static void __init __sme_map_range_pmd(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
while (ppd->vaddr < ppd->vaddr_end) {
|
||||
sme_populate_pgd_large(ppd);
|
||||
|
||||
ppd->vaddr += PMD_PAGE_SIZE;
|
||||
ppd->paddr += PMD_PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
static void __init __sme_map_range_pte(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
while (ppd->vaddr < ppd->vaddr_end) {
|
||||
sme_populate_pgd(ppd);
|
||||
|
||||
ppd->vaddr += PAGE_SIZE;
|
||||
ppd->paddr += PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
static void __init __sme_map_range(struct sme_populate_pgd_data *ppd,
|
||||
pmdval_t pmd_flags, pteval_t pte_flags)
|
||||
{
|
||||
unsigned long vaddr_end;
|
||||
|
||||
ppd->pmd_flags = pmd_flags;
|
||||
ppd->pte_flags = pte_flags;
|
||||
|
||||
/* Save original end value since we modify the struct value */
|
||||
vaddr_end = ppd->vaddr_end;
|
||||
|
||||
/* If start is not 2MB aligned, create PTE entries */
|
||||
ppd->vaddr_end = ALIGN(ppd->vaddr, PMD_PAGE_SIZE);
|
||||
__sme_map_range_pte(ppd);
|
||||
|
||||
/* Create PMD entries */
|
||||
ppd->vaddr_end = vaddr_end & PMD_PAGE_MASK;
|
||||
__sme_map_range_pmd(ppd);
|
||||
|
||||
/* If end is not 2MB aligned, create PTE entries */
|
||||
ppd->vaddr_end = vaddr_end;
|
||||
__sme_map_range_pte(ppd);
|
||||
}
|
||||
|
||||
static void __init sme_map_range_encrypted(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
__sme_map_range(ppd, PMD_FLAGS_ENC, PTE_FLAGS_ENC);
|
||||
}
|
||||
|
||||
static void __init sme_map_range_decrypted(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
__sme_map_range(ppd, PMD_FLAGS_DEC, PTE_FLAGS_DEC);
|
||||
}
|
||||
|
||||
static void __init sme_map_range_decrypted_wp(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
__sme_map_range(ppd, PMD_FLAGS_DEC_WP, PTE_FLAGS_DEC_WP);
|
||||
}
|
||||
|
||||
static unsigned long __init sme_pgtable_calc(unsigned long len)
|
||||
{
|
||||
unsigned long p4d_size, pud_size, pmd_size, pte_size;
|
||||
unsigned long total;
|
||||
|
||||
/*
|
||||
* Perform a relatively simplistic calculation of the pagetable
|
||||
* entries that are needed. Those mappings will be covered mostly
|
||||
* by 2MB PMD entries so we can conservatively calculate the required
|
||||
* number of P4D, PUD and PMD structures needed to perform the
|
||||
* mappings. For mappings that are not 2MB aligned, PTE mappings
|
||||
* would be needed for the start and end portion of the address range
|
||||
* that fall outside of the 2MB alignment. This results in, at most,
|
||||
* two extra pages to hold PTE entries for each range that is mapped.
|
||||
* Incrementing the count for each covers the case where the addresses
|
||||
* cross entries.
|
||||
*/
|
||||
if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
|
||||
p4d_size = (ALIGN(len, PGDIR_SIZE) / PGDIR_SIZE) + 1;
|
||||
p4d_size *= sizeof(p4d_t) * PTRS_PER_P4D;
|
||||
pud_size = (ALIGN(len, P4D_SIZE) / P4D_SIZE) + 1;
|
||||
pud_size *= sizeof(pud_t) * PTRS_PER_PUD;
|
||||
} else {
|
||||
p4d_size = 0;
|
||||
pud_size = (ALIGN(len, PGDIR_SIZE) / PGDIR_SIZE) + 1;
|
||||
pud_size *= sizeof(pud_t) * PTRS_PER_PUD;
|
||||
}
|
||||
pmd_size = (ALIGN(len, PUD_SIZE) / PUD_SIZE) + 1;
|
||||
pmd_size *= sizeof(pmd_t) * PTRS_PER_PMD;
|
||||
pte_size = 2 * sizeof(pte_t) * PTRS_PER_PTE;
|
||||
|
||||
total = p4d_size + pud_size + pmd_size + pte_size;
|
||||
|
||||
/*
|
||||
* Now calculate the added pagetable structures needed to populate
|
||||
* the new pagetables.
|
||||
*/
|
||||
if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
|
||||
p4d_size = ALIGN(total, PGDIR_SIZE) / PGDIR_SIZE;
|
||||
p4d_size *= sizeof(p4d_t) * PTRS_PER_P4D;
|
||||
pud_size = ALIGN(total, P4D_SIZE) / P4D_SIZE;
|
||||
pud_size *= sizeof(pud_t) * PTRS_PER_PUD;
|
||||
} else {
|
||||
p4d_size = 0;
|
||||
pud_size = ALIGN(total, PGDIR_SIZE) / PGDIR_SIZE;
|
||||
pud_size *= sizeof(pud_t) * PTRS_PER_PUD;
|
||||
}
|
||||
pmd_size = ALIGN(total, PUD_SIZE) / PUD_SIZE;
|
||||
pmd_size *= sizeof(pmd_t) * PTRS_PER_PMD;
|
||||
|
||||
total += p4d_size + pud_size + pmd_size;
|
||||
|
||||
return total;
|
||||
}
|
||||
|
||||
void __init __nostackprotector sme_encrypt_kernel(struct boot_params *bp)
|
||||
{
|
||||
unsigned long workarea_start, workarea_end, workarea_len;
|
||||
unsigned long execute_start, execute_end, execute_len;
|
||||
unsigned long kernel_start, kernel_end, kernel_len;
|
||||
unsigned long initrd_start, initrd_end, initrd_len;
|
||||
struct sme_populate_pgd_data ppd;
|
||||
unsigned long pgtable_area_len;
|
||||
unsigned long decrypted_base;
|
||||
|
||||
if (!sme_active())
|
||||
return;
|
||||
|
||||
/*
|
||||
* Prepare for encrypting the kernel and initrd by building new
|
||||
* pagetables with the necessary attributes needed to encrypt the
|
||||
* kernel in place.
|
||||
*
|
||||
* One range of virtual addresses will map the memory occupied
|
||||
* by the kernel and initrd as encrypted.
|
||||
*
|
||||
* Another range of virtual addresses will map the memory occupied
|
||||
* by the kernel and initrd as decrypted and write-protected.
|
||||
*
|
||||
* The use of write-protect attribute will prevent any of the
|
||||
* memory from being cached.
|
||||
*/
|
||||
|
||||
/* Physical addresses gives us the identity mapped virtual addresses */
|
||||
kernel_start = __pa_symbol(_text);
|
||||
kernel_end = ALIGN(__pa_symbol(_end), PMD_PAGE_SIZE);
|
||||
kernel_len = kernel_end - kernel_start;
|
||||
|
||||
initrd_start = 0;
|
||||
initrd_end = 0;
|
||||
initrd_len = 0;
|
||||
#ifdef CONFIG_BLK_DEV_INITRD
|
||||
initrd_len = (unsigned long)bp->hdr.ramdisk_size |
|
||||
((unsigned long)bp->ext_ramdisk_size << 32);
|
||||
if (initrd_len) {
|
||||
initrd_start = (unsigned long)bp->hdr.ramdisk_image |
|
||||
((unsigned long)bp->ext_ramdisk_image << 32);
|
||||
initrd_end = PAGE_ALIGN(initrd_start + initrd_len);
|
||||
initrd_len = initrd_end - initrd_start;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Set the encryption workarea to be immediately after the kernel */
|
||||
workarea_start = kernel_end;
|
||||
|
||||
/*
|
||||
* Calculate required number of workarea bytes needed:
|
||||
* executable encryption area size:
|
||||
* stack page (PAGE_SIZE)
|
||||
* encryption routine page (PAGE_SIZE)
|
||||
* intermediate copy buffer (PMD_PAGE_SIZE)
|
||||
* pagetable structures for the encryption of the kernel
|
||||
* pagetable structures for workarea (in case not currently mapped)
|
||||
*/
|
||||
execute_start = workarea_start;
|
||||
execute_end = execute_start + (PAGE_SIZE * 2) + PMD_PAGE_SIZE;
|
||||
execute_len = execute_end - execute_start;
|
||||
|
||||
/*
|
||||
* One PGD for both encrypted and decrypted mappings and a set of
|
||||
* PUDs and PMDs for each of the encrypted and decrypted mappings.
|
||||
*/
|
||||
pgtable_area_len = sizeof(pgd_t) * PTRS_PER_PGD;
|
||||
pgtable_area_len += sme_pgtable_calc(execute_end - kernel_start) * 2;
|
||||
if (initrd_len)
|
||||
pgtable_area_len += sme_pgtable_calc(initrd_len) * 2;
|
||||
|
||||
/* PUDs and PMDs needed in the current pagetables for the workarea */
|
||||
pgtable_area_len += sme_pgtable_calc(execute_len + pgtable_area_len);
|
||||
|
||||
/*
|
||||
* The total workarea includes the executable encryption area and
|
||||
* the pagetable area. The start of the workarea is already 2MB
|
||||
* aligned, align the end of the workarea on a 2MB boundary so that
|
||||
* we don't try to create/allocate PTE entries from the workarea
|
||||
* before it is mapped.
|
||||
*/
|
||||
workarea_len = execute_len + pgtable_area_len;
|
||||
workarea_end = ALIGN(workarea_start + workarea_len, PMD_PAGE_SIZE);
|
||||
|
||||
/*
|
||||
* Set the address to the start of where newly created pagetable
|
||||
* structures (PGDs, PUDs and PMDs) will be allocated. New pagetable
|
||||
* structures are created when the workarea is added to the current
|
||||
* pagetables and when the new encrypted and decrypted kernel
|
||||
* mappings are populated.
|
||||
*/
|
||||
ppd.pgtable_area = (void *)execute_end;
|
||||
|
||||
/*
|
||||
* Make sure the current pagetable structure has entries for
|
||||
* addressing the workarea.
|
||||
*/
|
||||
ppd.pgd = (pgd_t *)native_read_cr3_pa();
|
||||
ppd.paddr = workarea_start;
|
||||
ppd.vaddr = workarea_start;
|
||||
ppd.vaddr_end = workarea_end;
|
||||
sme_map_range_decrypted(&ppd);
|
||||
|
||||
/* Flush the TLB - no globals so cr3 is enough */
|
||||
native_write_cr3(__native_read_cr3());
|
||||
|
||||
/*
|
||||
* A new pagetable structure is being built to allow for the kernel
|
||||
* and initrd to be encrypted. It starts with an empty PGD that will
|
||||
* then be populated with new PUDs and PMDs as the encrypted and
|
||||
* decrypted kernel mappings are created.
|
||||
*/
|
||||
ppd.pgd = ppd.pgtable_area;
|
||||
memset(ppd.pgd, 0, sizeof(pgd_t) * PTRS_PER_PGD);
|
||||
ppd.pgtable_area += sizeof(pgd_t) * PTRS_PER_PGD;
|
||||
|
||||
/*
|
||||
* A different PGD index/entry must be used to get different
|
||||
* pagetable entries for the decrypted mapping. Choose the next
|
||||
* PGD index and convert it to a virtual address to be used as
|
||||
* the base of the mapping.
|
||||
*/
|
||||
decrypted_base = (pgd_index(workarea_end) + 1) & (PTRS_PER_PGD - 1);
|
||||
if (initrd_len) {
|
||||
unsigned long check_base;
|
||||
|
||||
check_base = (pgd_index(initrd_end) + 1) & (PTRS_PER_PGD - 1);
|
||||
decrypted_base = max(decrypted_base, check_base);
|
||||
}
|
||||
decrypted_base <<= PGDIR_SHIFT;
|
||||
|
||||
/* Add encrypted kernel (identity) mappings */
|
||||
ppd.paddr = kernel_start;
|
||||
ppd.vaddr = kernel_start;
|
||||
ppd.vaddr_end = kernel_end;
|
||||
sme_map_range_encrypted(&ppd);
|
||||
|
||||
/* Add decrypted, write-protected kernel (non-identity) mappings */
|
||||
ppd.paddr = kernel_start;
|
||||
ppd.vaddr = kernel_start + decrypted_base;
|
||||
ppd.vaddr_end = kernel_end + decrypted_base;
|
||||
sme_map_range_decrypted_wp(&ppd);
|
||||
|
||||
if (initrd_len) {
|
||||
/* Add encrypted initrd (identity) mappings */
|
||||
ppd.paddr = initrd_start;
|
||||
ppd.vaddr = initrd_start;
|
||||
ppd.vaddr_end = initrd_end;
|
||||
sme_map_range_encrypted(&ppd);
|
||||
/*
|
||||
* Add decrypted, write-protected initrd (non-identity) mappings
|
||||
*/
|
||||
ppd.paddr = initrd_start;
|
||||
ppd.vaddr = initrd_start + decrypted_base;
|
||||
ppd.vaddr_end = initrd_end + decrypted_base;
|
||||
sme_map_range_decrypted_wp(&ppd);
|
||||
}
|
||||
|
||||
/* Add decrypted workarea mappings to both kernel mappings */
|
||||
ppd.paddr = workarea_start;
|
||||
ppd.vaddr = workarea_start;
|
||||
ppd.vaddr_end = workarea_end;
|
||||
sme_map_range_decrypted(&ppd);
|
||||
|
||||
ppd.paddr = workarea_start;
|
||||
ppd.vaddr = workarea_start + decrypted_base;
|
||||
ppd.vaddr_end = workarea_end + decrypted_base;
|
||||
sme_map_range_decrypted(&ppd);
|
||||
|
||||
/* Perform the encryption */
|
||||
sme_encrypt_execute(kernel_start, kernel_start + decrypted_base,
|
||||
kernel_len, workarea_start, (unsigned long)ppd.pgd);
|
||||
|
||||
if (initrd_len)
|
||||
sme_encrypt_execute(initrd_start, initrd_start + decrypted_base,
|
||||
initrd_len, workarea_start,
|
||||
(unsigned long)ppd.pgd);
|
||||
|
||||
/*
|
||||
* At this point we are running encrypted. Remove the mappings for
|
||||
* the decrypted areas - all that is needed for this is to remove
|
||||
* the PGD entry/entries.
|
||||
*/
|
||||
ppd.vaddr = kernel_start + decrypted_base;
|
||||
ppd.vaddr_end = kernel_end + decrypted_base;
|
||||
sme_clear_pgd(&ppd);
|
||||
|
||||
if (initrd_len) {
|
||||
ppd.vaddr = initrd_start + decrypted_base;
|
||||
ppd.vaddr_end = initrd_end + decrypted_base;
|
||||
sme_clear_pgd(&ppd);
|
||||
}
|
||||
|
||||
ppd.vaddr = workarea_start + decrypted_base;
|
||||
ppd.vaddr_end = workarea_end + decrypted_base;
|
||||
sme_clear_pgd(&ppd);
|
||||
|
||||
/* Flush the TLB - no globals so cr3 is enough */
|
||||
native_write_cr3(__native_read_cr3());
|
||||
}
|
||||
|
||||
void __init __nostackprotector sme_enable(struct boot_params *bp)
|
||||
{
|
||||
const char *cmdline_ptr, *cmdline_arg, *cmdline_on, *cmdline_off;
|
||||
unsigned int eax, ebx, ecx, edx;
|
||||
unsigned long feature_mask;
|
||||
bool active_by_default;
|
||||
unsigned long me_mask;
|
||||
char buffer[16];
|
||||
u64 msr;
|
||||
|
||||
/* Check for the SME/SEV support leaf */
|
||||
eax = 0x80000000;
|
||||
ecx = 0;
|
||||
native_cpuid(&eax, &ebx, &ecx, &edx);
|
||||
if (eax < 0x8000001f)
|
||||
return;
|
||||
|
||||
#define AMD_SME_BIT BIT(0)
|
||||
#define AMD_SEV_BIT BIT(1)
|
||||
/*
|
||||
* Set the feature mask (SME or SEV) based on whether we are
|
||||
* running under a hypervisor.
|
||||
*/
|
||||
eax = 1;
|
||||
ecx = 0;
|
||||
native_cpuid(&eax, &ebx, &ecx, &edx);
|
||||
feature_mask = (ecx & BIT(31)) ? AMD_SEV_BIT : AMD_SME_BIT;
|
||||
|
||||
/*
|
||||
* Check for the SME/SEV feature:
|
||||
* CPUID Fn8000_001F[EAX]
|
||||
* - Bit 0 - Secure Memory Encryption support
|
||||
* - Bit 1 - Secure Encrypted Virtualization support
|
||||
* CPUID Fn8000_001F[EBX]
|
||||
* - Bits 5:0 - Pagetable bit position used to indicate encryption
|
||||
*/
|
||||
eax = 0x8000001f;
|
||||
ecx = 0;
|
||||
native_cpuid(&eax, &ebx, &ecx, &edx);
|
||||
if (!(eax & feature_mask))
|
||||
return;
|
||||
|
||||
me_mask = 1UL << (ebx & 0x3f);
|
||||
|
||||
/* Check if memory encryption is enabled */
|
||||
if (feature_mask == AMD_SME_BIT) {
|
||||
/* For SME, check the SYSCFG MSR */
|
||||
msr = __rdmsr(MSR_K8_SYSCFG);
|
||||
if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
|
||||
return;
|
||||
} else {
|
||||
/* For SEV, check the SEV MSR */
|
||||
msr = __rdmsr(MSR_AMD64_SEV);
|
||||
if (!(msr & MSR_AMD64_SEV_ENABLED))
|
||||
return;
|
||||
|
||||
/* SEV state cannot be controlled by a command line option */
|
||||
sme_me_mask = me_mask;
|
||||
sev_enabled = true;
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fixups have not been applied to phys_base yet and we're running
|
||||
* identity mapped, so we must obtain the address to the SME command
|
||||
* line argument data using rip-relative addressing.
|
||||
*/
|
||||
asm ("lea sme_cmdline_arg(%%rip), %0"
|
||||
: "=r" (cmdline_arg)
|
||||
: "p" (sme_cmdline_arg));
|
||||
asm ("lea sme_cmdline_on(%%rip), %0"
|
||||
: "=r" (cmdline_on)
|
||||
: "p" (sme_cmdline_on));
|
||||
asm ("lea sme_cmdline_off(%%rip), %0"
|
||||
: "=r" (cmdline_off)
|
||||
: "p" (sme_cmdline_off));
|
||||
|
||||
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT))
|
||||
active_by_default = true;
|
||||
else
|
||||
active_by_default = false;
|
||||
|
||||
cmdline_ptr = (const char *)((u64)bp->hdr.cmd_line_ptr |
|
||||
((u64)bp->ext_cmd_line_ptr << 32));
|
||||
|
||||
cmdline_find_option(cmdline_ptr, cmdline_arg, buffer, sizeof(buffer));
|
||||
|
||||
if (!strncmp(buffer, cmdline_on, sizeof(buffer)))
|
||||
sme_me_mask = me_mask;
|
||||
else if (!strncmp(buffer, cmdline_off, sizeof(buffer)))
|
||||
sme_me_mask = 0;
|
||||
else
|
||||
sme_me_mask = active_by_default ? me_mask : 0;
|
||||
}
|
||||
|
|
564
arch/x86/mm/mem_encrypt_identity.c
Normal file
564
arch/x86/mm/mem_encrypt_identity.c
Normal file
|
@ -0,0 +1,564 @@
|
|||
/*
|
||||
* AMD Memory Encryption Support
|
||||
*
|
||||
* Copyright (C) 2016 Advanced Micro Devices, Inc.
|
||||
*
|
||||
* Author: Tom Lendacky <thomas.lendacky@amd.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#define DISABLE_BRANCH_PROFILING
|
||||
|
||||
/*
|
||||
* Since we're dealing with identity mappings, physical and virtual
|
||||
* addresses are the same, so override these defines which are ultimately
|
||||
* used by the headers in misc.h.
|
||||
*/
|
||||
#define __pa(x) ((unsigned long)(x))
|
||||
#define __va(x) ((void *)((unsigned long)(x)))
|
||||
|
||||
/*
|
||||
* Special hack: we have to be careful, because no indirections are
|
||||
* allowed here, and paravirt_ops is a kind of one. As it will only run in
|
||||
* baremetal anyway, we just keep it from happening. (This list needs to
|
||||
* be extended when new paravirt and debugging variants are added.)
|
||||
*/
|
||||
#undef CONFIG_PARAVIRT
|
||||
#undef CONFIG_PARAVIRT_SPINLOCKS
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/mem_encrypt.h>
|
||||
|
||||
#include <asm/setup.h>
|
||||
#include <asm/sections.h>
|
||||
#include <asm/cmdline.h>
|
||||
|
||||
#include "mm_internal.h"
|
||||
|
||||
#define PGD_FLAGS _KERNPG_TABLE_NOENC
|
||||
#define P4D_FLAGS _KERNPG_TABLE_NOENC
|
||||
#define PUD_FLAGS _KERNPG_TABLE_NOENC
|
||||
#define PMD_FLAGS _KERNPG_TABLE_NOENC
|
||||
|
||||
#define PMD_FLAGS_LARGE (__PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL)
|
||||
|
||||
#define PMD_FLAGS_DEC PMD_FLAGS_LARGE
|
||||
#define PMD_FLAGS_DEC_WP ((PMD_FLAGS_DEC & ~_PAGE_CACHE_MASK) | \
|
||||
(_PAGE_PAT | _PAGE_PWT))
|
||||
|
||||
#define PMD_FLAGS_ENC (PMD_FLAGS_LARGE | _PAGE_ENC)
|
||||
|
||||
#define PTE_FLAGS (__PAGE_KERNEL_EXEC & ~_PAGE_GLOBAL)
|
||||
|
||||
#define PTE_FLAGS_DEC PTE_FLAGS
|
||||
#define PTE_FLAGS_DEC_WP ((PTE_FLAGS_DEC & ~_PAGE_CACHE_MASK) | \
|
||||
(_PAGE_PAT | _PAGE_PWT))
|
||||
|
||||
#define PTE_FLAGS_ENC (PTE_FLAGS | _PAGE_ENC)
|
||||
|
||||
struct sme_populate_pgd_data {
|
||||
void *pgtable_area;
|
||||
pgd_t *pgd;
|
||||
|
||||
pmdval_t pmd_flags;
|
||||
pteval_t pte_flags;
|
||||
unsigned long paddr;
|
||||
|
||||
unsigned long vaddr;
|
||||
unsigned long vaddr_end;
|
||||
};
|
||||
|
||||
static char sme_cmdline_arg[] __initdata = "mem_encrypt";
|
||||
static char sme_cmdline_on[] __initdata = "on";
|
||||
static char sme_cmdline_off[] __initdata = "off";
|
||||
|
||||
static void __init sme_clear_pgd(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
unsigned long pgd_start, pgd_end, pgd_size;
|
||||
pgd_t *pgd_p;
|
||||
|
||||
pgd_start = ppd->vaddr & PGDIR_MASK;
|
||||
pgd_end = ppd->vaddr_end & PGDIR_MASK;
|
||||
|
||||
pgd_size = (((pgd_end - pgd_start) / PGDIR_SIZE) + 1) * sizeof(pgd_t);
|
||||
|
||||
pgd_p = ppd->pgd + pgd_index(ppd->vaddr);
|
||||
|
||||
memset(pgd_p, 0, pgd_size);
|
||||
}
|
||||
|
||||
static pud_t __init *sme_prepare_pgd(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
pgd_t *pgd;
|
||||
p4d_t *p4d;
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
|
||||
pgd = ppd->pgd + pgd_index(ppd->vaddr);
|
||||
if (pgd_none(*pgd)) {
|
||||
p4d = ppd->pgtable_area;
|
||||
memset(p4d, 0, sizeof(*p4d) * PTRS_PER_P4D);
|
||||
ppd->pgtable_area += sizeof(*p4d) * PTRS_PER_P4D;
|
||||
set_pgd(pgd, __pgd(PGD_FLAGS | __pa(p4d)));
|
||||
}
|
||||
|
||||
p4d = p4d_offset(pgd, ppd->vaddr);
|
||||
if (p4d_none(*p4d)) {
|
||||
pud = ppd->pgtable_area;
|
||||
memset(pud, 0, sizeof(*pud) * PTRS_PER_PUD);
|
||||
ppd->pgtable_area += sizeof(*pud) * PTRS_PER_PUD;
|
||||
set_p4d(p4d, __p4d(P4D_FLAGS | __pa(pud)));
|
||||
}
|
||||
|
||||
pud = pud_offset(p4d, ppd->vaddr);
|
||||
if (pud_none(*pud)) {
|
||||
pmd = ppd->pgtable_area;
|
||||
memset(pmd, 0, sizeof(*pmd) * PTRS_PER_PMD);
|
||||
ppd->pgtable_area += sizeof(*pmd) * PTRS_PER_PMD;
|
||||
set_pud(pud, __pud(PUD_FLAGS | __pa(pmd)));
|
||||
}
|
||||
|
||||
if (pud_large(*pud))
|
||||
return NULL;
|
||||
|
||||
return pud;
|
||||
}
|
||||
|
||||
static void __init sme_populate_pgd_large(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
|
||||
pud = sme_prepare_pgd(ppd);
|
||||
if (!pud)
|
||||
return;
|
||||
|
||||
pmd = pmd_offset(pud, ppd->vaddr);
|
||||
if (pmd_large(*pmd))
|
||||
return;
|
||||
|
||||
set_pmd(pmd, __pmd(ppd->paddr | ppd->pmd_flags));
|
||||
}
|
||||
|
||||
static void __init sme_populate_pgd(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
pte_t *pte;
|
||||
|
||||
pud = sme_prepare_pgd(ppd);
|
||||
if (!pud)
|
||||
return;
|
||||
|
||||
pmd = pmd_offset(pud, ppd->vaddr);
|
||||
if (pmd_none(*pmd)) {
|
||||
pte = ppd->pgtable_area;
|
||||
memset(pte, 0, sizeof(pte) * PTRS_PER_PTE);
|
||||
ppd->pgtable_area += sizeof(pte) * PTRS_PER_PTE;
|
||||
set_pmd(pmd, __pmd(PMD_FLAGS | __pa(pte)));
|
||||
}
|
||||
|
||||
if (pmd_large(*pmd))
|
||||
return;
|
||||
|
||||
pte = pte_offset_map(pmd, ppd->vaddr);
|
||||
if (pte_none(*pte))
|
||||
set_pte(pte, __pte(ppd->paddr | ppd->pte_flags));
|
||||
}
|
||||
|
||||
static void __init __sme_map_range_pmd(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
while (ppd->vaddr < ppd->vaddr_end) {
|
||||
sme_populate_pgd_large(ppd);
|
||||
|
||||
ppd->vaddr += PMD_PAGE_SIZE;
|
||||
ppd->paddr += PMD_PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
static void __init __sme_map_range_pte(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
while (ppd->vaddr < ppd->vaddr_end) {
|
||||
sme_populate_pgd(ppd);
|
||||
|
||||
ppd->vaddr += PAGE_SIZE;
|
||||
ppd->paddr += PAGE_SIZE;
|
||||
}
|
||||
}
|
||||
|
||||
static void __init __sme_map_range(struct sme_populate_pgd_data *ppd,
|
||||
pmdval_t pmd_flags, pteval_t pte_flags)
|
||||
{
|
||||
unsigned long vaddr_end;
|
||||
|
||||
ppd->pmd_flags = pmd_flags;
|
||||
ppd->pte_flags = pte_flags;
|
||||
|
||||
/* Save original end value since we modify the struct value */
|
||||
vaddr_end = ppd->vaddr_end;
|
||||
|
||||
/* If start is not 2MB aligned, create PTE entries */
|
||||
ppd->vaddr_end = ALIGN(ppd->vaddr, PMD_PAGE_SIZE);
|
||||
__sme_map_range_pte(ppd);
|
||||
|
||||
/* Create PMD entries */
|
||||
ppd->vaddr_end = vaddr_end & PMD_PAGE_MASK;
|
||||
__sme_map_range_pmd(ppd);
|
||||
|
||||
/* If end is not 2MB aligned, create PTE entries */
|
||||
ppd->vaddr_end = vaddr_end;
|
||||
__sme_map_range_pte(ppd);
|
||||
}
|
||||
|
||||
static void __init sme_map_range_encrypted(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
__sme_map_range(ppd, PMD_FLAGS_ENC, PTE_FLAGS_ENC);
|
||||
}
|
||||
|
||||
static void __init sme_map_range_decrypted(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
__sme_map_range(ppd, PMD_FLAGS_DEC, PTE_FLAGS_DEC);
|
||||
}
|
||||
|
||||
static void __init sme_map_range_decrypted_wp(struct sme_populate_pgd_data *ppd)
|
||||
{
|
||||
__sme_map_range(ppd, PMD_FLAGS_DEC_WP, PTE_FLAGS_DEC_WP);
|
||||
}
|
||||
|
||||
static unsigned long __init sme_pgtable_calc(unsigned long len)
|
||||
{
|
||||
unsigned long entries = 0, tables = 0;
|
||||
|
||||
/*
|
||||
* Perform a relatively simplistic calculation of the pagetable
|
||||
* entries that are needed. Those mappings will be covered mostly
|
||||
* by 2MB PMD entries so we can conservatively calculate the required
|
||||
* number of P4D, PUD and PMD structures needed to perform the
|
||||
* mappings. For mappings that are not 2MB aligned, PTE mappings
|
||||
* would be needed for the start and end portion of the address range
|
||||
* that fall outside of the 2MB alignment. This results in, at most,
|
||||
* two extra pages to hold PTE entries for each range that is mapped.
|
||||
* Incrementing the count for each covers the case where the addresses
|
||||
* cross entries.
|
||||
*/
|
||||
|
||||
/* PGDIR_SIZE is equal to P4D_SIZE on 4-level machine. */
|
||||
if (PTRS_PER_P4D > 1)
|
||||
entries += (DIV_ROUND_UP(len, PGDIR_SIZE) + 1) * sizeof(p4d_t) * PTRS_PER_P4D;
|
||||
entries += (DIV_ROUND_UP(len, P4D_SIZE) + 1) * sizeof(pud_t) * PTRS_PER_PUD;
|
||||
entries += (DIV_ROUND_UP(len, PUD_SIZE) + 1) * sizeof(pmd_t) * PTRS_PER_PMD;
|
||||
entries += 2 * sizeof(pte_t) * PTRS_PER_PTE;
|
||||
|
||||
/*
|
||||
* Now calculate the added pagetable structures needed to populate
|
||||
* the new pagetables.
|
||||
*/
|
||||
|
||||
if (PTRS_PER_P4D > 1)
|
||||
tables += DIV_ROUND_UP(entries, PGDIR_SIZE) * sizeof(p4d_t) * PTRS_PER_P4D;
|
||||
tables += DIV_ROUND_UP(entries, P4D_SIZE) * sizeof(pud_t) * PTRS_PER_PUD;
|
||||
tables += DIV_ROUND_UP(entries, PUD_SIZE) * sizeof(pmd_t) * PTRS_PER_PMD;
|
||||
|
||||
return entries + tables;
|
||||
}
|
||||
|
||||
void __init __nostackprotector sme_encrypt_kernel(struct boot_params *bp)
|
||||
{
|
||||
unsigned long workarea_start, workarea_end, workarea_len;
|
||||
unsigned long execute_start, execute_end, execute_len;
|
||||
unsigned long kernel_start, kernel_end, kernel_len;
|
||||
unsigned long initrd_start, initrd_end, initrd_len;
|
||||
struct sme_populate_pgd_data ppd;
|
||||
unsigned long pgtable_area_len;
|
||||
unsigned long decrypted_base;
|
||||
|
||||
if (!sme_active())
|
||||
return;
|
||||
|
||||
/*
|
||||
* Prepare for encrypting the kernel and initrd by building new
|
||||
* pagetables with the necessary attributes needed to encrypt the
|
||||
* kernel in place.
|
||||
*
|
||||
* One range of virtual addresses will map the memory occupied
|
||||
* by the kernel and initrd as encrypted.
|
||||
*
|
||||
* Another range of virtual addresses will map the memory occupied
|
||||
* by the kernel and initrd as decrypted and write-protected.
|
||||
*
|
||||
* The use of write-protect attribute will prevent any of the
|
||||
* memory from being cached.
|
||||
*/
|
||||
|
||||
/* Physical addresses gives us the identity mapped virtual addresses */
|
||||
kernel_start = __pa_symbol(_text);
|
||||
kernel_end = ALIGN(__pa_symbol(_end), PMD_PAGE_SIZE);
|
||||
kernel_len = kernel_end - kernel_start;
|
||||
|
||||
initrd_start = 0;
|
||||
initrd_end = 0;
|
||||
initrd_len = 0;
|
||||
#ifdef CONFIG_BLK_DEV_INITRD
|
||||
initrd_len = (unsigned long)bp->hdr.ramdisk_size |
|
||||
((unsigned long)bp->ext_ramdisk_size << 32);
|
||||
if (initrd_len) {
|
||||
initrd_start = (unsigned long)bp->hdr.ramdisk_image |
|
||||
((unsigned long)bp->ext_ramdisk_image << 32);
|
||||
initrd_end = PAGE_ALIGN(initrd_start + initrd_len);
|
||||
initrd_len = initrd_end - initrd_start;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* Set the encryption workarea to be immediately after the kernel */
|
||||
workarea_start = kernel_end;
|
||||
|
||||
/*
|
||||
* Calculate required number of workarea bytes needed:
|
||||
* executable encryption area size:
|
||||
* stack page (PAGE_SIZE)
|
||||
* encryption routine page (PAGE_SIZE)
|
||||
* intermediate copy buffer (PMD_PAGE_SIZE)
|
||||
* pagetable structures for the encryption of the kernel
|
||||
* pagetable structures for workarea (in case not currently mapped)
|
||||
*/
|
||||
execute_start = workarea_start;
|
||||
execute_end = execute_start + (PAGE_SIZE * 2) + PMD_PAGE_SIZE;
|
||||
execute_len = execute_end - execute_start;
|
||||
|
||||
/*
|
||||
* One PGD for both encrypted and decrypted mappings and a set of
|
||||
* PUDs and PMDs for each of the encrypted and decrypted mappings.
|
||||
*/
|
||||
pgtable_area_len = sizeof(pgd_t) * PTRS_PER_PGD;
|
||||
pgtable_area_len += sme_pgtable_calc(execute_end - kernel_start) * 2;
|
||||
if (initrd_len)
|
||||
pgtable_area_len += sme_pgtable_calc(initrd_len) * 2;
|
||||
|
||||
/* PUDs and PMDs needed in the current pagetables for the workarea */
|
||||
pgtable_area_len += sme_pgtable_calc(execute_len + pgtable_area_len);
|
||||
|
||||
/*
|
||||
* The total workarea includes the executable encryption area and
|
||||
* the pagetable area. The start of the workarea is already 2MB
|
||||
* aligned, align the end of the workarea on a 2MB boundary so that
|
||||
* we don't try to create/allocate PTE entries from the workarea
|
||||
* before it is mapped.
|
||||
*/
|
||||
workarea_len = execute_len + pgtable_area_len;
|
||||
workarea_end = ALIGN(workarea_start + workarea_len, PMD_PAGE_SIZE);
|
||||
|
||||
/*
|
||||
* Set the address to the start of where newly created pagetable
|
||||
* structures (PGDs, PUDs and PMDs) will be allocated. New pagetable
|
||||
* structures are created when the workarea is added to the current
|
||||
* pagetables and when the new encrypted and decrypted kernel
|
||||
* mappings are populated.
|
||||
*/
|
||||
ppd.pgtable_area = (void *)execute_end;
|
||||
|
||||
/*
|
||||
* Make sure the current pagetable structure has entries for
|
||||
* addressing the workarea.
|
||||
*/
|
||||
ppd.pgd = (pgd_t *)native_read_cr3_pa();
|
||||
ppd.paddr = workarea_start;
|
||||
ppd.vaddr = workarea_start;
|
||||
ppd.vaddr_end = workarea_end;
|
||||
sme_map_range_decrypted(&ppd);
|
||||
|
||||
/* Flush the TLB - no globals so cr3 is enough */
|
||||
native_write_cr3(__native_read_cr3());
|
||||
|
||||
/*
|
||||
* A new pagetable structure is being built to allow for the kernel
|
||||
* and initrd to be encrypted. It starts with an empty PGD that will
|
||||
* then be populated with new PUDs and PMDs as the encrypted and
|
||||
* decrypted kernel mappings are created.
|
||||
*/
|
||||
ppd.pgd = ppd.pgtable_area;
|
||||
memset(ppd.pgd, 0, sizeof(pgd_t) * PTRS_PER_PGD);
|
||||
ppd.pgtable_area += sizeof(pgd_t) * PTRS_PER_PGD;
|
||||
|
||||
/*
|
||||
* A different PGD index/entry must be used to get different
|
||||
* pagetable entries for the decrypted mapping. Choose the next
|
||||
* PGD index and convert it to a virtual address to be used as
|
||||
* the base of the mapping.
|
||||
*/
|
||||
decrypted_base = (pgd_index(workarea_end) + 1) & (PTRS_PER_PGD - 1);
|
||||
if (initrd_len) {
|
||||
unsigned long check_base;
|
||||
|
||||
check_base = (pgd_index(initrd_end) + 1) & (PTRS_PER_PGD - 1);
|
||||
decrypted_base = max(decrypted_base, check_base);
|
||||
}
|
||||
decrypted_base <<= PGDIR_SHIFT;
|
||||
|
||||
/* Add encrypted kernel (identity) mappings */
|
||||
ppd.paddr = kernel_start;
|
||||
ppd.vaddr = kernel_start;
|
||||
ppd.vaddr_end = kernel_end;
|
||||
sme_map_range_encrypted(&ppd);
|
||||
|
||||
/* Add decrypted, write-protected kernel (non-identity) mappings */
|
||||
ppd.paddr = kernel_start;
|
||||
ppd.vaddr = kernel_start + decrypted_base;
|
||||
ppd.vaddr_end = kernel_end + decrypted_base;
|
||||
sme_map_range_decrypted_wp(&ppd);
|
||||
|
||||
if (initrd_len) {
|
||||
/* Add encrypted initrd (identity) mappings */
|
||||
ppd.paddr = initrd_start;
|
||||
ppd.vaddr = initrd_start;
|
||||
ppd.vaddr_end = initrd_end;
|
||||
sme_map_range_encrypted(&ppd);
|
||||
/*
|
||||
* Add decrypted, write-protected initrd (non-identity) mappings
|
||||
*/
|
||||
ppd.paddr = initrd_start;
|
||||
ppd.vaddr = initrd_start + decrypted_base;
|
||||
ppd.vaddr_end = initrd_end + decrypted_base;
|
||||
sme_map_range_decrypted_wp(&ppd);
|
||||
}
|
||||
|
||||
/* Add decrypted workarea mappings to both kernel mappings */
|
||||
ppd.paddr = workarea_start;
|
||||
ppd.vaddr = workarea_start;
|
||||
ppd.vaddr_end = workarea_end;
|
||||
sme_map_range_decrypted(&ppd);
|
||||
|
||||
ppd.paddr = workarea_start;
|
||||
ppd.vaddr = workarea_start + decrypted_base;
|
||||
ppd.vaddr_end = workarea_end + decrypted_base;
|
||||
sme_map_range_decrypted(&ppd);
|
||||
|
||||
/* Perform the encryption */
|
||||
sme_encrypt_execute(kernel_start, kernel_start + decrypted_base,
|
||||
kernel_len, workarea_start, (unsigned long)ppd.pgd);
|
||||
|
||||
if (initrd_len)
|
||||
sme_encrypt_execute(initrd_start, initrd_start + decrypted_base,
|
||||
initrd_len, workarea_start,
|
||||
(unsigned long)ppd.pgd);
|
||||
|
||||
/*
|
||||
* At this point we are running encrypted. Remove the mappings for
|
||||
* the decrypted areas - all that is needed for this is to remove
|
||||
* the PGD entry/entries.
|
||||
*/
|
||||
ppd.vaddr = kernel_start + decrypted_base;
|
||||
ppd.vaddr_end = kernel_end + decrypted_base;
|
||||
sme_clear_pgd(&ppd);
|
||||
|
||||
if (initrd_len) {
|
||||
ppd.vaddr = initrd_start + decrypted_base;
|
||||
ppd.vaddr_end = initrd_end + decrypted_base;
|
||||
sme_clear_pgd(&ppd);
|
||||
}
|
||||
|
||||
ppd.vaddr = workarea_start + decrypted_base;
|
||||
ppd.vaddr_end = workarea_end + decrypted_base;
|
||||
sme_clear_pgd(&ppd);
|
||||
|
||||
/* Flush the TLB - no globals so cr3 is enough */
|
||||
native_write_cr3(__native_read_cr3());
|
||||
}
|
||||
|
||||
void __init __nostackprotector sme_enable(struct boot_params *bp)
|
||||
{
|
||||
const char *cmdline_ptr, *cmdline_arg, *cmdline_on, *cmdline_off;
|
||||
unsigned int eax, ebx, ecx, edx;
|
||||
unsigned long feature_mask;
|
||||
bool active_by_default;
|
||||
unsigned long me_mask;
|
||||
char buffer[16];
|
||||
u64 msr;
|
||||
|
||||
/* Check for the SME/SEV support leaf */
|
||||
eax = 0x80000000;
|
||||
ecx = 0;
|
||||
native_cpuid(&eax, &ebx, &ecx, &edx);
|
||||
if (eax < 0x8000001f)
|
||||
return;
|
||||
|
||||
#define AMD_SME_BIT BIT(0)
|
||||
#define AMD_SEV_BIT BIT(1)
|
||||
/*
|
||||
* Set the feature mask (SME or SEV) based on whether we are
|
||||
* running under a hypervisor.
|
||||
*/
|
||||
eax = 1;
|
||||
ecx = 0;
|
||||
native_cpuid(&eax, &ebx, &ecx, &edx);
|
||||
feature_mask = (ecx & BIT(31)) ? AMD_SEV_BIT : AMD_SME_BIT;
|
||||
|
||||
/*
|
||||
* Check for the SME/SEV feature:
|
||||
* CPUID Fn8000_001F[EAX]
|
||||
* - Bit 0 - Secure Memory Encryption support
|
||||
* - Bit 1 - Secure Encrypted Virtualization support
|
||||
* CPUID Fn8000_001F[EBX]
|
||||
* - Bits 5:0 - Pagetable bit position used to indicate encryption
|
||||
*/
|
||||
eax = 0x8000001f;
|
||||
ecx = 0;
|
||||
native_cpuid(&eax, &ebx, &ecx, &edx);
|
||||
if (!(eax & feature_mask))
|
||||
return;
|
||||
|
||||
me_mask = 1UL << (ebx & 0x3f);
|
||||
|
||||
/* Check if memory encryption is enabled */
|
||||
if (feature_mask == AMD_SME_BIT) {
|
||||
/* For SME, check the SYSCFG MSR */
|
||||
msr = __rdmsr(MSR_K8_SYSCFG);
|
||||
if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
|
||||
return;
|
||||
} else {
|
||||
/* For SEV, check the SEV MSR */
|
||||
msr = __rdmsr(MSR_AMD64_SEV);
|
||||
if (!(msr & MSR_AMD64_SEV_ENABLED))
|
||||
return;
|
||||
|
||||
/* SEV state cannot be controlled by a command line option */
|
||||
sme_me_mask = me_mask;
|
||||
sev_enabled = true;
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Fixups have not been applied to phys_base yet and we're running
|
||||
* identity mapped, so we must obtain the address to the SME command
|
||||
* line argument data using rip-relative addressing.
|
||||
*/
|
||||
asm ("lea sme_cmdline_arg(%%rip), %0"
|
||||
: "=r" (cmdline_arg)
|
||||
: "p" (sme_cmdline_arg));
|
||||
asm ("lea sme_cmdline_on(%%rip), %0"
|
||||
: "=r" (cmdline_on)
|
||||
: "p" (sme_cmdline_on));
|
||||
asm ("lea sme_cmdline_off(%%rip), %0"
|
||||
: "=r" (cmdline_off)
|
||||
: "p" (sme_cmdline_off));
|
||||
|
||||
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT))
|
||||
active_by_default = true;
|
||||
else
|
||||
active_by_default = false;
|
||||
|
||||
cmdline_ptr = (const char *)((u64)bp->hdr.cmd_line_ptr |
|
||||
((u64)bp->ext_cmd_line_ptr << 32));
|
||||
|
||||
cmdline_find_option(cmdline_ptr, cmdline_arg, buffer, sizeof(buffer));
|
||||
|
||||
if (!strncmp(buffer, cmdline_on, sizeof(buffer)))
|
||||
sme_me_mask = me_mask;
|
||||
else if (!strncmp(buffer, cmdline_off, sizeof(buffer)))
|
||||
sme_me_mask = 0;
|
||||
else
|
||||
sme_me_mask = active_by_default ? me_mask : 0;
|
||||
}
|
|
@ -613,7 +613,7 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
|
|||
{
|
||||
int cpu;
|
||||
|
||||
struct flush_tlb_info info = {
|
||||
struct flush_tlb_info info __aligned(SMP_CACHE_BYTES) = {
|
||||
.mm = mm,
|
||||
};
|
||||
|
||||
|
|
|
@ -27,6 +27,7 @@
|
|||
#include <linux/ioport.h>
|
||||
#include <linux/mc146818rtc.h>
|
||||
#include <linux/efi.h>
|
||||
#include <linux/export.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/reboot.h>
|
||||
|
@ -190,7 +191,8 @@ void __init efi_call_phys_epilog(pgd_t *save_pgd)
|
|||
early_code_mapping_set_exec(0);
|
||||
}
|
||||
|
||||
static pgd_t *efi_pgd;
|
||||
pgd_t *efi_pgd;
|
||||
EXPORT_SYMBOL_GPL(efi_pgd);
|
||||
|
||||
/*
|
||||
* We need our own copy of the higher levels of the page tables
|
||||
|
|
Loading…
Reference in a new issue