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authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-15 09:19:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-15 09:19:20 -0700
commit1aaf2e59135fd67321f47c11c64a54aac27014e9 (patch)
tree633ffa4db3ac6e8d566cba549510561ffd61d8f4 /arch/x86/kernel
parent66a4fe0cb80a9fde8cb173289afb863fd279466a (diff)
parent936e894a976dd3b0f07f1f6f43c17b77b7e6146d (diff)
Merge branch 'x86-txt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-txt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, intel_txt: clean up the impact on generic code, unbreak non-x86 x86, intel_txt: Handle ACPI_SLEEP without X86_TRAMPOLINE x86, intel_txt: Fix typos in Kconfig help x86, intel_txt: Factor out the code for S3 setup x86, intel_txt: tboot.c needs <asm/fixmap.h> intel_txt: Force IOMMU on for Intel TXT launch x86, intel_txt: Intel TXT Sx shutdown support x86, intel_txt: Intel TXT reboot/halt shutdown support x86, intel_txt: Intel TXT boot support
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r--arch/x86/kernel/Makefile1
-rw-r--r--arch/x86/kernel/reboot.c7
-rw-r--r--arch/x86/kernel/setup.c3
-rw-r--r--arch/x86/kernel/smpboot.c2
-rw-r--r--arch/x86/kernel/tboot.c447
5 files changed, 460 insertions, 0 deletions
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 430d5b24af7..832cb838cb4 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -52,6 +52,7 @@ obj-$(CONFIG_X86_DS_SELFTEST) += ds_selftest.o
obj-$(CONFIG_X86_32) += tls.o
obj-$(CONFIG_IA32_EMULATION) += tls.o
obj-y += step.o
+obj-$(CONFIG_INTEL_TXT) += tboot.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += cpu/
obj-y += acpi/
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index a06e8d10184..27349f92a6d 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -4,6 +4,7 @@
#include <linux/pm.h>
#include <linux/efi.h>
#include <linux/dmi.h>
+#include <linux/tboot.h>
#include <acpi/reboot.h>
#include <asm/io.h>
#include <asm/apic.h>
@@ -508,6 +509,8 @@ static void native_machine_emergency_restart(void)
if (reboot_emergency)
emergency_vmx_disable_all();
+ tboot_shutdown(TB_SHUTDOWN_REBOOT);
+
/* Tell the BIOS if we want cold or warm reboot */
*((unsigned short *)__va(0x472)) = reboot_mode;
@@ -634,6 +637,8 @@ static void native_machine_halt(void)
/* stop other cpus and apics */
machine_shutdown();
+ tboot_shutdown(TB_SHUTDOWN_HALT);
+
/* stop this cpu */
stop_this_cpu(NULL);
}
@@ -645,6 +650,8 @@ static void native_machine_power_off(void)
machine_shutdown();
pm_power_off();
}
+ /* a fallback in case there is no PM info available */
+ tboot_shutdown(TB_SHUTDOWN_HALT);
}
struct machine_ops machine_ops = {
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 63f32d220ef..61f86f24142 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -66,6 +66,7 @@
#include <linux/percpu.h>
#include <linux/crash_dump.h>
+#include <linux/tboot.h>
#include <video/edid.h>
@@ -977,6 +978,8 @@ void __init setup_arch(char **cmdline_p)
paravirt_pagetable_setup_done(swapper_pg_dir);
paravirt_post_allocator_init();
+ tboot_probe();
+
#ifdef CONFIG_X86_64
map_vsyscall();
#endif
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c36cc1452cd..9d8319183aa 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -47,6 +47,7 @@
#include <linux/bootmem.h>
#include <linux/err.h>
#include <linux/nmi.h>
+#include <linux/tboot.h>
#include <asm/acpi.h>
#include <asm/desc.h>
@@ -1318,6 +1319,7 @@ void play_dead_common(void)
void native_play_dead(void)
{
play_dead_common();
+ tboot_shutdown(TB_SHUTDOWN_WFS);
wbinvd_halt();
}
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
new file mode 100644
index 00000000000..86c9f91b48a
--- /dev/null
+++ b/arch/x86/kernel/tboot.c
@@ -0,0 +1,447 @@
+/*
+ * 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/dma_remapping.h>
+#include <linux/init_task.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/init.h>
+#include <linux/dmar.h>
+#include <linux/cpu.h>
+#include <linux/pfn.h>
+#include <linux/mm.h>
+#include <linux/tboot.h>
+
+#include <asm/trampoline.h>
+#include <asm/processor.h>
+#include <asm/bootparam.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/fixmap.h>
+#include <asm/proto.h>
+#include <asm/setup.h>
+#include <asm/e820.h>
+#include <asm/io.h>
+
+#include "acpi/realmode/wakeup.h"
+
+/* Global pointer to shared data; NULL means no measured launch. */
+struct tboot *tboot __read_mostly;
+
+/* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */
+#define AP_WAIT_TIMEOUT 1
+
+#undef pr_fmt
+#define pr_fmt(fmt) "tboot: " fmt
+
+static u8 tboot_uuid[16] __initdata = TBOOT_UUID;
+
+void __init tboot_probe(void)
+{
+ /* Look for valid page-aligned address for shared page. */
+ if (!boot_params.tboot_addr)
+ return;
+ /*
+ * also verify that it is mapped as we expect it before calling
+ * set_fixmap(), to reduce chance of garbage value causing crash
+ */
+ if (!e820_any_mapped(boot_params.tboot_addr,
+ boot_params.tboot_addr, E820_RESERVED)) {
+ pr_warning("non-0 tboot_addr but it is not of type E820_RESERVED\n");
+ return;
+ }
+
+ /* only a natively booted kernel should be using TXT */
+ if (paravirt_enabled()) {
+ pr_warning("non-0 tboot_addr but pv_ops is enabled\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 = 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,
+ .pgd = swapper_pg_dir,
+ .mm_users = ATOMIC_INIT(2),
+ .mm_count = ATOMIC_INIT(1),
+ .mmap_sem = __RWSEM_INITIALIZER(init_mm.mmap_sem),
+ .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock),
+ .mmlist = LIST_HEAD_INIT(init_mm.mmlist),
+ .cpu_vm_mask = CPU_MASK_ALL,
+};
+
+static inline void switch_to_tboot_pt(void)
+{
+ write_cr3(virt_to_phys(tboot_pg_dir));
+}
+
+static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
+ pgprot_t prot)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = pgd_offset(&tboot_mm, vaddr);
+ pud = pud_alloc(&tboot_mm, pgd, vaddr);
+ if (!pud)
+ return -1;
+ pmd = pmd_alloc(&tboot_mm, pud, vaddr);
+ if (!pmd)
+ return -1;
+ pte = pte_alloc_map(&tboot_mm, pmd, vaddr);
+ if (!pte)
+ return -1;
+ set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot));
+ pte_unmap(pte);
+ return 0;
+}
+
+static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn,
+ unsigned long nr)
+{
+ /* Reuse the original kernel mapping */
+ tboot_pg_dir = pgd_alloc(&tboot_mm);
+ if (!tboot_pg_dir)
+ return -1;
+
+ for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) {
+ if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC))
+ return -1;
+ }
+
+ return 0;
+}
+
+static void tboot_create_trampoline(void)
+{
+ u32 map_base, map_size;
+
+ /* Create identity map for tboot shutdown code. */
+ map_base = PFN_DOWN(tboot->tboot_base);
+ map_size = PFN_UP(tboot->tboot_size);
+ if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size))
+ panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n",
+ map_base, map_size);
+}
+
+#ifdef CONFIG_ACPI_SLEEP
+
+static void add_mac_region(phys_addr_t start, unsigned long size)
+{
+ struct tboot_mac_region *mr;
+ phys_addr_t end = start + size;
+
+ if (start && size) {
+ mr = &tboot->mac_regions[tboot->num_mac_regions++];
+ mr->start = round_down(start, PAGE_SIZE);
+ mr->size = round_up(end, PAGE_SIZE) - mr->start;
+ }
+}
+
+static int tboot_setup_sleep(void)
+{
+ tboot->num_mac_regions = 0;
+
+ /* S3 resume code */
+ add_mac_region(acpi_wakeup_address, WAKEUP_SIZE);
+
+#ifdef CONFIG_X86_TRAMPOLINE
+ /* AP trampoline code */
+ add_mac_region(virt_to_phys(trampoline_base), TRAMPOLINE_SIZE);
+#endif
+
+ /* kernel code + data + bss */
+ add_mac_region(virt_to_phys(_text), _end - _text);
+
+ tboot->acpi_sinfo.kernel_s3_resume_vector = acpi_wakeup_address;
+
+ return 0;
+}
+
+#else /* no CONFIG_ACPI_SLEEP */
+
+static int tboot_setup_sleep(void)
+{
+ /* S3 shutdown requested, but S3 not supported by the kernel... */
+ BUG();
+ return -1;
+}
+
+#endif
+
+void tboot_shutdown(u32 shutdown_type)
+{
+ void (*shutdown)(void);
+
+ if (!tboot_enabled())
+ return;
+
+ /*
+ * if we're being called before the 1:1 mapping is set up then just
+ * return and let the normal shutdown happen; this should only be
+ * due to very early panic()
+ */
+ if (!tboot_pg_dir)
+ return;
+
+ /* if this is S3 then set regions to MAC */
+ if (shutdown_type == TB_SHUTDOWN_S3)
+ if (tboot_setup_sleep())
+ return;
+
+ tboot->shutdown_type = shutdown_type;
+
+ switch_to_tboot_pt();
+
+ shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
+ shutdown();
+
+ /* should not reach here */
+ while (1)
+ halt();
+}
+
+static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
+{
+#define TB_COPY_GAS(tbg, g) \
+ tbg.space_id = g.space_id; \
+ tbg.bit_width = g.bit_width; \
+ tbg.bit_offset = g.bit_offset; \
+ tbg.access_width = g.access_width; \
+ tbg.address = g.address;
+
+ TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block);
+ TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block);
+ TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block);
+ TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block);
+
+ /*
+ * We need phys addr of waking vector, but can't use virt_to_phys() on
+ * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys
+ * addr.
+ */
+ tboot->acpi_sinfo.wakeup_vector = fadt->facs +
+ offsetof(struct acpi_table_facs, firmware_waking_vector);
+}
+
+void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
+{
+ static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
+ /* S0,1,2: */ -1, -1, -1,
+ /* S3: */ TB_SHUTDOWN_S3,
+ /* S4: */ TB_SHUTDOWN_S4,
+ /* S5: */ TB_SHUTDOWN_S5 };
+
+ if (!tboot_enabled())
+ return;
+
+ tboot_copy_fadt(&acpi_gbl_FADT);
+ tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
+ tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control;
+ /* we always use the 32b wakeup vector */
+ tboot->acpi_sinfo.vector_width = 32;
+
+ if (sleep_state >= ACPI_S_STATE_COUNT ||
+ acpi_shutdown_map[sleep_state] == -1) {
+ pr_warning("unsupported sleep state 0x%x\n", sleep_state);
+ return;
+ }
+
+ tboot_shutdown(acpi_shutdown_map[sleep_state]);
+}
+
+static atomic_t ap_wfs_count;
+
+static int tboot_wait_for_aps(int num_aps)
+{
+ unsigned long timeout;
+
+ timeout = AP_WAIT_TIMEOUT*HZ;
+ while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps &&
+ timeout) {
+ mdelay(1);
+ timeout--;
+ }
+
+ if (timeout)
+ pr_warning("tboot wait for APs timeout\n");
+
+ return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps);
+}
+
+static int __cpuinit tboot_cpu_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case CPU_DYING:
+ atomic_inc(&ap_wfs_count);
+ if (num_online_cpus() == 1)
+ if (tboot_wait_for_aps(atomic_read(&ap_wfs_count)))
+ return NOTIFY_BAD;
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block tboot_cpu_notifier __cpuinitdata =
+{
+ .notifier_call = tboot_cpu_callback,
+};
+
+static __init int tboot_late_init(void)
+{
+ if (!tboot_enabled())
+ return 0;
+
+ tboot_create_trampoline();
+
+ atomic_set(&ap_wfs_count, 0);
+ register_hotcpu_notifier(&tboot_cpu_notifier);
+ return 0;
+}
+
+late_initcall(tboot_late_init);
+
+/*
+ * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE)
+ */
+
+#define TXT_PUB_CONFIG_REGS_BASE 0xfed30000
+#define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000
+
+/* # pages for each config regs space - used by fixmap */
+#define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \
+ TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT)
+
+/* offsets from pub/priv config space */
+#define TXTCR_HEAP_BASE 0x0300
+#define TXTCR_HEAP_SIZE 0x0308
+
+#define SHA1_SIZE 20
+
+struct sha1_hash {
+ u8 hash[SHA1_SIZE];
+};
+
+struct sinit_mle_data {
+ u32 version; /* currently 6 */
+ struct sha1_hash bios_acm_id;
+ u32 edx_senter_flags;
+ u64 mseg_valid;
+ struct sha1_hash sinit_hash;
+ struct sha1_hash mle_hash;
+ struct sha1_hash stm_hash;
+ struct sha1_hash lcp_policy_hash;
+ u32 lcp_policy_control;
+ u32 rlp_wakeup_addr;
+ u32 reserved;
+ u32 num_mdrs;
+ u32 mdrs_off;
+ u32 num_vtd_dmars;
+ u32 vtd_dmars_off;
+} __packed;
+
+struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl)
+{
+ void *heap_base, *heap_ptr, *config;
+
+ if (!tboot_enabled())
+ return dmar_tbl;
+
+ /*
+ * ACPI tables may not be DMA protected by tboot, so use DMAR copy
+ * SINIT saved in SinitMleData in TXT heap (which is DMA protected)
+ */
+
+ /* map config space in order to get heap addr */
+ config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES *
+ PAGE_SIZE);
+ if (!config)
+ return NULL;
+
+ /* now map TXT heap */
+ heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE),
+ *(u64 *)(config + TXTCR_HEAP_SIZE));
+ iounmap(config);
+ if (!heap_base)
+ return NULL;
+
+ /* walk heap to SinitMleData */
+ /* skip BiosData */
+ heap_ptr = heap_base + *(u64 *)heap_base;
+ /* skip OsMleData */
+ heap_ptr += *(u64 *)heap_ptr;
+ /* skip OsSinitData */
+ heap_ptr += *(u64 *)heap_ptr;
+ /* now points to SinitMleDataSize; set to SinitMleData */
+ heap_ptr += sizeof(u64);
+ /* get addr of DMAR table */
+ dmar_tbl = (struct acpi_table_header *)(heap_ptr +
+ ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off -
+ sizeof(u64));
+
+ /* don't unmap heap because dmar.c needs access to this */
+
+ return dmar_tbl;
+}
+
+int tboot_force_iommu(void)
+{
+ if (!tboot_enabled())
+ return 0;
+
+ 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;
+}