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Diffstat (limited to 'arch/x86/kernel/tboot.c')
-rw-r--r--arch/x86/kernel/tboot.c109
1 files changed, 42 insertions, 67 deletions
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index 6e5ef8fb8a02..46b8f1f16676 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -1,25 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* tboot.c: main implementation of helper functions used by kernel for
* runtime support of Intel(R) Trusted Execution Technology
*
* Copyright (c) 2006-2009, Intel Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
- *
*/
-#include <linux/intel-iommu.h>
#include <linux/init_task.h>
#include <linux/spinlock.h>
#include <linux/export.h>
@@ -36,9 +22,7 @@
#include <asm/realmode.h>
#include <asm/processor.h>
#include <asm/bootparam.h>
-#include <asm/pgtable.h>
#include <asm/pgalloc.h>
-#include <asm/swiotlb.h>
#include <asm/fixmap.h>
#include <asm/proto.h>
#include <asm/setup.h>
@@ -48,8 +32,7 @@
#include "../realmode/rm/wakeup.h"
/* Global pointer to shared data; NULL means no measured launch. */
-struct tboot *tboot __read_mostly;
-EXPORT_SYMBOL(tboot);
+static struct tboot *tboot __read_mostly;
/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
#define AP_WAIT_TIMEOUT 1
@@ -59,6 +42,35 @@ EXPORT_SYMBOL(tboot);
static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
+bool tboot_enabled(void)
+{
+ return tboot != NULL;
+}
+
+/* noinline to prevent gcc from warning about dereferencing constant fixaddr */
+static noinline __init bool check_tboot_version(void)
+{
+ if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
+ pr_warn("tboot at 0x%llx is invalid\n", boot_params.tboot_addr);
+ return false;
+ }
+
+ if (tboot->version < 5) {
+ pr_warn("tboot version is invalid: %u\n", tboot->version);
+ return false;
+ }
+
+ pr_info("found shared page at phys addr 0x%llx:\n",
+ boot_params.tboot_addr);
+ pr_debug("version: %d\n", tboot->version);
+ pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
+ pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
+ pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
+ pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
+
+ return true;
+}
+
void __init tboot_probe(void)
{
/* Look for valid page-aligned address for shared page. */
@@ -70,41 +82,25 @@ void __init tboot_probe(void)
*/
if (!e820__mapped_any(boot_params.tboot_addr,
boot_params.tboot_addr, E820_TYPE_RESERVED)) {
- pr_warning("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n");
+ pr_warn("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n");
return;
}
/* Map and check for tboot UUID. */
set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr);
- tboot = (struct tboot *)fix_to_virt(FIX_TBOOT_BASE);
- if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) {
- pr_warning("tboot at 0x%llx is invalid\n",
- boot_params.tboot_addr);
+ tboot = (void *)fix_to_virt(FIX_TBOOT_BASE);
+ if (!check_tboot_version())
tboot = NULL;
- return;
- }
- if (tboot->version < 5) {
- pr_warning("tboot version is invalid: %u\n", tboot->version);
- tboot = NULL;
- return;
- }
-
- pr_info("found shared page at phys addr 0x%llx:\n",
- boot_params.tboot_addr);
- pr_debug("version: %d\n", tboot->version);
- pr_debug("log_addr: 0x%08x\n", tboot->log_addr);
- pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry);
- pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base);
- pr_debug("tboot_size: 0x%x\n", tboot->tboot_size);
}
static pgd_t *tboot_pg_dir;
static struct mm_struct tboot_mm = {
- .mm_rb = RB_ROOT,
+ .mm_mt = MTREE_INIT_EXT(mm_mt, MM_MT_FLAGS, tboot_mm.mmap_lock),
.pgd = swapper_pg_dir,
.mm_users = ATOMIC_INIT(2),
.mm_count = ATOMIC_INIT(1),
- .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
+ .write_protect_seq = SEQCNT_ZERO(tboot_mm.write_protect_seq),
+ MMAP_LOCK_INITIALIZER(init_mm)
.page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
.mmlist = LIST_HEAD_INIT(init_mm.mmlist),
};
@@ -204,8 +200,7 @@ static int tboot_setup_sleep(void)
tboot->num_mac_regions = 0;
for (i = 0; i < e820_table->nr_entries; i++) {
- if ((e820_table->entries[i].type != E820_TYPE_RAM)
- && (e820_table->entries[i].type != E820_TYPE_RESERVED_KERN))
+ if (e820_table->entries[i].type != E820_TYPE_RAM)
continue;
add_mac_region(e820_table->entries[i].addr, e820_table->entries[i].size);
@@ -302,7 +297,7 @@ static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
if (sleep_state >= ACPI_S_STATE_COUNT ||
acpi_shutdown_map[sleep_state] == -1) {
- pr_warning("unsupported sleep state 0x%x\n", sleep_state);
+ pr_warn("unsupported sleep state 0x%x\n", sleep_state);
return -1;
}
@@ -315,7 +310,7 @@ static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b)
if (!tboot_enabled())
return 0;
- pr_warning("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
+ pr_warn("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)");
return -ENODEV;
}
@@ -333,7 +328,7 @@ static int tboot_wait_for_aps(int num_aps)
}
if (timeout)
- pr_warning("tboot wait for APs timeout\n");
+ pr_warn("tboot wait for APs timeout\n");
return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
}
@@ -368,7 +363,7 @@ static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t c
void *kbuf;
int ret = -EFAULT;
- log_base = ioremap_nocache(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
+ log_base = ioremap(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE);
if (!log_base)
return ret;
@@ -519,23 +514,3 @@ struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tb
return dmar_tbl;
}
-
-int tboot_force_iommu(void)
-{
- if (!tboot_enabled())
- return 0;
-
- if (intel_iommu_tboot_noforce)
- return 1;
-
- if (no_iommu || swiotlb || dmar_disabled)
- pr_warning("Forcing Intel-IOMMU to enabled\n");
-
- dmar_disabled = 0;
-#ifdef CONFIG_SWIOTLB
- swiotlb = 0;
-#endif
- no_iommu = 0;
-
- return 1;
-}
generated by cgit (git 2.34.1) at 2025-12-24 20:14:56 +0000