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Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 microcode updates from Thomas Gleixner:

 - more work to make the microcode loader robust

 - a fix for the micro code load precedence

 - fixes for initrd loading with randomized memory

 - less printk noise on SMP machines

* 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/asm, x86/microcode: Add __PAGE_OFFSET_BASE define on 32-bit
  x86/microcode/intel: Fix initrd loading with CONFIG_RANDOMIZE_MEMORY=y
  x86/microcode: Remove unused symbol exports
  x86/microcode/intel: Do not issue microcode updates messages on each CPU
  Documentation/microcode: Document some aspects for more clarity
  x86/microcode/AMD: Make amd_ucode_patch[] static
  x86/microcode/intel: Unexport save_mc_for_early()
  x86/microcode/intel: Rename load_microcode_early() to find_microcode_patch()
  x86/microcode: Propagate save_microcode_in_initrd() retval
  x86/microcode: Get rid of find_cpio_data()'s dummy offset arg
  lib/cpio: Make find_cpio_data()'s offset arg optional
  x86/microcode: Fix suspend to RAM with builtin microcode
  x86/microcode: Fix loading precedence
This commit is contained in:
Linus Torvalds 2016-07-30 13:18:33 -07:00
commit d761f3ed6e
11 changed files with 198 additions and 160 deletions
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5
Documentation/x86/early-microcode.txt
View File

@ -45,7 +45,10 @@ Builtin microcode
=================
We can also load builtin microcode supplied through the regular firmware
builtin method CONFIG_FIRMWARE_IN_KERNEL. Here's an example:
builtin method CONFIG_FIRMWARE_IN_KERNEL. Only 64-bit is currently
supported.
Here's an example:
CONFIG_FIRMWARE_IN_KERNEL=y
CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"

26
arch/x86/include/asm/microcode.h
View File

@ -133,40 +133,14 @@ static inline unsigned int x86_cpuid_family(void)
#ifdef CONFIG_MICROCODE
extern void __init load_ucode_bsp(void);
extern void load_ucode_ap(void);
extern int __init save_microcode_in_initrd(void);
void reload_early_microcode(void);
extern bool get_builtin_firmware(struct cpio_data *cd, const char *name);
#else
static inline void __init load_ucode_bsp(void) { }
static inline void load_ucode_ap(void) { }
static inline int __init save_microcode_in_initrd(void) { return 0; }
static inline void reload_early_microcode(void) { }
static inline bool
get_builtin_firmware(struct cpio_data *cd, const char *name) { return false; }
#endif
static inline unsigned long get_initrd_start(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
return initrd_start;
#else
return 0;
#endif
}
static inline unsigned long get_initrd_start_addr(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
#ifdef CONFIG_X86_32
unsigned long *initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
return (unsigned long)__pa_nodebug(*initrd_start_p);
#else
return get_initrd_start();
#endif
#else /* CONFIG_BLK_DEV_INITRD */
return 0;
#endif
}
#endif /* _ASM_X86_MICROCODE_H */

1
arch/x86/include/asm/microcode_amd.h
View File

@ -62,7 +62,6 @@ extern int apply_microcode_amd(int cpu);
extern enum ucode_state load_microcode_amd(int cpu, u8 family, const u8 *data, size_t size);
#define PATCH_MAX_SIZE PAGE_SIZE
extern u8 amd_ucode_patch[PATCH_MAX_SIZE];
#ifdef CONFIG_MICROCODE_AMD
extern void __init load_ucode_amd_bsp(unsigned int family);

5
arch/x86/include/asm/microcode_intel.h
View File

@ -70,9 +70,4 @@ static inline int __init save_microcode_in_initrd_intel(void) { return -EINVAL;
static inline void reload_ucode_intel(void) {}
#endif
#ifdef CONFIG_HOTPLUG_CPU
extern int save_mc_for_early(u8 *mc);
#else
static inline int save_mc_for_early(u8 *mc) { return 0; }
#endif
#endif /* _ASM_X86_MICROCODE_INTEL_H */

3
arch/x86/include/asm/page_32_types.h
View File

@ -13,7 +13,8 @@
* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
* and CONFIG_HIGHMEM64G options in the kernel configuration.
*/
#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
#define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL)
#define __PAGE_OFFSET __PAGE_OFFSET_BASE
#define __START_KERNEL_map __PAGE_OFFSET

33
arch/x86/kernel/cpu/microcode/amd.c
View File

@ -56,24 +56,24 @@ static u8 *container;
static size_t container_size;
static u32 ucode_new_rev;
u8 amd_ucode_patch[PATCH_MAX_SIZE];
static u8 amd_ucode_patch[PATCH_MAX_SIZE];
static u16 this_equiv_id;
static struct cpio_data ucode_cpio;
/*
* Microcode patch container file is prepended to the initrd in cpio format.
* See Documentation/x86/early-microcode.txt
*/
static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
static struct cpio_data __init find_ucode_in_initrd(void)
{
long offset = 0;
#ifdef CONFIG_BLK_DEV_INITRD
char *path;
void *start;
size_t size;
/*
* Microcode patch container file is prepended to the initrd in cpio
* format. See Documentation/x86/early-microcode.txt
*/
static __initdata char ucode_path[] = "kernel/x86/microcode/AuthenticAMD.bin";
#ifdef CONFIG_X86_32
struct boot_params *p;
@ -89,9 +89,12 @@ static struct cpio_data __init find_ucode_in_initrd(void)
path = ucode_path;
start = (void *)(boot_params.hdr.ramdisk_image + PAGE_OFFSET);
size = boot_params.hdr.ramdisk_size;
#endif
#endif /* !CONFIG_X86_32 */
return find_cpio_data(path, start, size, &offset);
return find_cpio_data(path, start, size, NULL);
#else
return (struct cpio_data){ NULL, 0, "" };
#endif
}
static size_t compute_container_size(u8 *data, u32 total_size)
@ -289,11 +292,11 @@ void __init load_ucode_amd_bsp(unsigned int family)
size = &ucode_cpio.size;
#endif
cp = find_ucode_in_initrd();
if (!cp.data) {
if (!load_builtin_amd_microcode(&cp, family))
return;
}
if (!load_builtin_amd_microcode(&cp, family))
cp = find_ucode_in_initrd();
if (!(cp.data && cp.size))
return;
*data = cp.data;
*size = cp.size;

10
arch/x86/kernel/cpu/microcode/core.c
View File

@ -60,7 +60,6 @@ static bool dis_ucode_ldr;
static DEFINE_MUTEX(microcode_mutex);
struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
EXPORT_SYMBOL_GPL(ucode_cpu_info);
/*
* Operations that are run on a target cpu:
@ -175,24 +174,24 @@ void load_ucode_ap(void)
}
}
int __init save_microcode_in_initrd(void)
static int __init save_microcode_in_initrd(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
switch (c->x86_vendor) {
case X86_VENDOR_INTEL:
if (c->x86 >= 6)
save_microcode_in_initrd_intel();
return save_microcode_in_initrd_intel();
break;
case X86_VENDOR_AMD:
if (c->x86 >= 0x10)
save_microcode_in_initrd_amd();
return save_microcode_in_initrd_amd();
break;
default:
break;
}
return 0;
return -EINVAL;
}
void reload_early_microcode(void)
@ -691,4 +690,5 @@ int __init microcode_init(void)
return error;
}
fs_initcall(save_microcode_in_initrd);
late_initcall(microcode_init);

261
arch/x86/kernel/cpu/microcode/intel.c
View File

@ -40,9 +40,13 @@
#include <asm/msr.h>
/*
* Temporary microcode blobs pointers storage. We note here the pointers to
* microcode blobs we've got from whatever storage (detached initrd, builtin).
* Later on, we put those into final storage mc_saved_data.mc_saved.
* Temporary microcode blobs pointers storage. We note here during early load
* the pointers to microcode blobs we've got from whatever storage (detached
* initrd, builtin). Later on, we put those into final storage
* mc_saved_data.mc_saved.
*
* Important: those are offsets from the beginning of initrd or absolute
* addresses within the kernel image when built-in.
*/
static unsigned long mc_tmp_ptrs[MAX_UCODE_COUNT];
@ -51,8 +55,15 @@ static struct mc_saved_data {
struct microcode_intel **mc_saved;
} mc_saved_data;
/* Microcode blobs within the initrd. 0 if builtin. */
static struct ucode_blobs {
unsigned long start;
bool valid;
} blobs;
/* Go through saved patches and find the one suitable for the current CPU. */
static enum ucode_state
load_microcode_early(struct microcode_intel **saved,
find_microcode_patch(struct microcode_intel **saved,
unsigned int num_saved, struct ucode_cpu_info *uci)
{
struct microcode_intel *ucode_ptr, *new_mc = NULL;
@ -121,13 +132,13 @@ load_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
if (!mcs->mc_saved) {
copy_ptrs(mc_saved_tmp, mc_ptrs, offset, count);
return load_microcode_early(mc_saved_tmp, count, uci);
return find_microcode_patch(mc_saved_tmp, count, uci);
} else {
#ifdef CONFIG_X86_32
microcode_phys(mc_saved_tmp, mcs);
return load_microcode_early(mc_saved_tmp, count, uci);
return find_microcode_patch(mc_saved_tmp, count, uci);
#else
return load_microcode_early(mcs->mc_saved, count, uci);
return find_microcode_patch(mcs->mc_saved, count, uci);
#endif
}
}
@ -450,8 +461,6 @@ static void show_saved_mc(void)
#endif
}
#ifdef CONFIG_HOTPLUG_CPU
static DEFINE_MUTEX(x86_cpu_microcode_mutex);
/*
* Save this mc into mc_saved_data. So it will be loaded early when a CPU is
* hot added or resumes.
@ -459,19 +468,18 @@ static DEFINE_MUTEX(x86_cpu_microcode_mutex);
* Please make sure this mc should be a valid microcode patch before calling
* this function.
*/
int save_mc_for_early(u8 *mc)
static void save_mc_for_early(u8 *mc)
{
#ifdef CONFIG_HOTPLUG_CPU
/* Synchronization during CPU hotplug. */
static DEFINE_MUTEX(x86_cpu_microcode_mutex);
struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
unsigned int mc_saved_count_init;
unsigned int num_saved;
struct microcode_intel **mc_saved;
int ret = 0;
int i;
int ret, i;
/*
* Hold hotplug lock so mc_saved_data is not accessed by a CPU in
* hotplug.
*/
mutex_lock(&x86_cpu_microcode_mutex);
mc_saved_count_init = mc_saved_data.num_saved;
@ -509,11 +517,8 @@ int save_mc_for_early(u8 *mc)
out:
mutex_unlock(&x86_cpu_microcode_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(save_mc_for_early);
#endif
}
static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
{
@ -532,37 +537,6 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
#endif
}
static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
static __init enum ucode_state
scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
unsigned long start, unsigned long size,
struct ucode_cpu_info *uci)
{
struct cpio_data cd;
long offset = 0;
#ifdef CONFIG_X86_32
char *p = (char *)__pa_nodebug(ucode_name);
#else
char *p = ucode_name;
#endif
cd.data = NULL;
cd.size = 0;
/* try built-in microcode if no initrd */
if (!size) {
if (!load_builtin_intel_microcode(&cd))
return UCODE_ERROR;
} else {
cd = find_cpio_data(p, (void *)start, size, &offset);
if (!cd.data)
return UCODE_ERROR;
}
return get_matching_model_microcode(start, cd.data, cd.size,
mcs, mc_ptrs, uci);
}
/*
* Print ucode update info.
*/
@ -680,38 +654,117 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
*/
int __init save_microcode_in_initrd_intel(void)
{
unsigned int count = mc_saved_data.num_saved;
struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
int ret = 0;
unsigned int count = mc_saved_data.num_saved;
unsigned long offset = 0;
int ret;
if (!count)
return ret;
return 0;
copy_ptrs(mc_saved, mc_tmp_ptrs, get_initrd_start(), count);
/*
* We have found a valid initrd but it might've been relocated in the
* meantime so get its updated address.
*/
if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && blobs.valid)
offset = initrd_start;
copy_ptrs(mc_saved, mc_tmp_ptrs, offset, count);
ret = save_microcode(&mc_saved_data, mc_saved, count);
if (ret)
pr_err("Cannot save microcode patches from initrd.\n");
show_saved_mc();
else
show_saved_mc();
return ret;
}
static __init enum ucode_state
__scan_microcode_initrd(struct cpio_data *cd, struct ucode_blobs *blbp)
{
#ifdef CONFIG_BLK_DEV_INITRD
static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
char *p = IS_ENABLED(CONFIG_X86_32) ? (char *)__pa_nodebug(ucode_name)
: ucode_name;
# ifdef CONFIG_X86_32
unsigned long start = 0, size;
struct boot_params *params;
params = (struct boot_params *)__pa_nodebug(&boot_params);
size = params->hdr.ramdisk_size;
/*
* Set start only if we have an initrd image. We cannot use initrd_start
* because it is not set that early yet.
*/
start = (size ? params->hdr.ramdisk_image : 0);
# else /* CONFIG_X86_64 */
unsigned long start = 0, size;
size = (u64)boot_params.ext_ramdisk_size << 32;
size |= boot_params.hdr.ramdisk_size;
if (size) {
start = (u64)boot_params.ext_ramdisk_image << 32;
start |= boot_params.hdr.ramdisk_image;
start += PAGE_OFFSET;
}
# endif
*cd = find_cpio_data(p, (void *)start, size, NULL);
if (cd->data) {
blbp->start = start;
blbp->valid = true;
return UCODE_OK;
} else
#endif /* CONFIG_BLK_DEV_INITRD */
return UCODE_ERROR;
}
static __init enum ucode_state
scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
struct ucode_cpu_info *uci, struct ucode_blobs *blbp)
{
struct cpio_data cd = { NULL, 0, "" };
enum ucode_state ret;
/* try built-in microcode first */
if (load_builtin_intel_microcode(&cd))
/*
* Invalidate blobs as we might've gotten an initrd too,
* supplied by the boot loader, by mistake or simply forgotten
* there. That's fine, we ignore it since we've found builtin
* microcode already.
*/
blbp->valid = false;
else {
ret = __scan_microcode_initrd(&cd, blbp);
if (ret != UCODE_OK)
return ret;
}
return get_matching_model_microcode(blbp->start, cd.data, cd.size,
mcs, mc_ptrs, uci);
}
static void __init
_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
unsigned long start, unsigned long size)
struct ucode_blobs *blbp)
{
struct ucode_cpu_info uci;
enum ucode_state ret;
collect_cpu_info_early(&uci);
ret = scan_microcode(mcs, mc_ptrs, start, size, &uci);
ret = scan_microcode(mcs, mc_ptrs, &uci, blbp);
if (ret != UCODE_OK)
return;
ret = load_microcode(mcs, mc_ptrs, start, &uci);
ret = load_microcode(mcs, mc_ptrs, blbp->start, &uci);
if (ret != UCODE_OK)
return;
@ -720,54 +773,60 @@ _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
void __init load_ucode_intel_bsp(void)
{
u64 start, size;
struct ucode_blobs *blobs_p;
struct mc_saved_data *mcs;
unsigned long *ptrs;
#ifdef CONFIG_X86_32
struct boot_params *p;
p = (struct boot_params *)__pa_nodebug(&boot_params);
size = p->hdr.ramdisk_size;
/*
* Set start only if we have an initrd image. We cannot use initrd_start
* because it is not set that early yet.
*/
start = (size ? p->hdr.ramdisk_image : 0);
_load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
(unsigned long *)__pa_nodebug(&mc_tmp_ptrs),
start, size);
mcs = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
ptrs = (unsigned long *)__pa_nodebug(&mc_tmp_ptrs);
blobs_p = (struct ucode_blobs *)__pa_nodebug(&blobs);
#else
size = boot_params.hdr.ramdisk_size;
start = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
_load_ucode_intel_bsp(&mc_saved_data, mc_tmp_ptrs, start, size);
mcs = &mc_saved_data;
ptrs = mc_tmp_ptrs;
blobs_p = &blobs;
#endif
_load_ucode_intel_bsp(mcs, ptrs, blobs_p);
}
void load_ucode_intel_ap(void)
{
unsigned long *mcs_tmp_p;
struct mc_saved_data *mcs_p;
struct ucode_blobs *blobs_p;
unsigned long *ptrs, start = 0;
struct mc_saved_data *mcs;
struct ucode_cpu_info uci;
enum ucode_state ret;
#ifdef CONFIG_X86_32
mcs_tmp_p = (unsigned long *)__pa_nodebug(mc_tmp_ptrs);
mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
#ifdef CONFIG_X86_32
mcs = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
ptrs = (unsigned long *)__pa_nodebug(mc_tmp_ptrs);
blobs_p = (struct ucode_blobs *)__pa_nodebug(&blobs);
#else
mcs_tmp_p = mc_tmp_ptrs;
mcs_p = &mc_saved_data;
mcs = &mc_saved_data;
ptrs = mc_tmp_ptrs;
blobs_p = &blobs;
#endif
/*
* If there is no valid ucode previously saved in memory, no need to
* update ucode on this AP.
*/
if (!mcs_p->num_saved)
if (!mcs->num_saved)
return;
if (blobs_p->valid) {
start = blobs_p->start;
/*
* Pay attention to CONFIG_RANDOMIZE_MEMORY=y as it shuffles
* physmem mapping too and there we have the initrd.
*/
start += PAGE_OFFSET - __PAGE_OFFSET_BASE;
}
collect_cpu_info_early(&uci);
ret = load_microcode(mcs_p, mcs_tmp_p, get_initrd_start_addr(), &uci);
ret = load_microcode(mcs, ptrs, start, &uci);
if (ret != UCODE_OK)
return;
@ -784,7 +843,7 @@ void reload_ucode_intel(void)
collect_cpu_info_early(&uci);
ret = load_microcode_early(mc_saved_data.mc_saved,
ret = find_microcode_patch(mc_saved_data.mc_saved,
mc_saved_data.num_saved, &uci);
if (ret != UCODE_OK)
return;
@ -794,6 +853,7 @@ void reload_ucode_intel(void)
static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
{
static struct cpu_signature prev;
struct cpuinfo_x86 *c = &cpu_data(cpu_num);
unsigned int val[2];
@ -808,8 +868,13 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
}
csig->rev = c->microcode;
pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
cpu_num, csig->sig, csig->pf, csig->rev);
/* No extra locking on prev, races are harmless. */
if (csig->sig != prev.sig || csig->pf != prev.pf || csig->rev != prev.rev) {
pr_info("sig=0x%x, pf=0x%x, revision=0x%x\n",
csig->sig, csig->pf, csig->rev);
prev = *csig;
}
return 0;
}
@ -838,6 +903,7 @@ static int apply_microcode_intel(int cpu)
struct ucode_cpu_info *uci;
struct cpuinfo_x86 *c;
unsigned int val[2];
static int prev_rev;
/* We should bind the task to the CPU */
if (WARN_ON(raw_smp_processor_id() != cpu))
@ -872,11 +938,14 @@ static int apply_microcode_intel(int cpu)
return -1;
}
pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
cpu, val[1],
mc->hdr.date & 0xffff,
mc->hdr.date >> 24,
(mc->hdr.date >> 16) & 0xff);
if (val[1] != prev_rev) {
pr_info("updated to revision 0x%x, date = %04x-%02x-%02x\n",
val[1],
mc->hdr.date & 0xffff,
mc->hdr.date >> 24,
(mc->hdr.date >> 16) & 0xff);
prev_rev = val[1];
}
c = &cpu_data(cpu);

2
arch/x86/kernel/cpu/microcode/intel_lib.c
View File

@ -141,7 +141,6 @@ int microcode_sanity_check(void *mc, int print_err)
}
return 0;
}
EXPORT_SYMBOL_GPL(microcode_sanity_check);
/*
* Returns 1 if update has been found, 0 otherwise.
@ -183,4 +182,3 @@ int has_newer_microcode(void *mc, unsigned int csig, int cpf, int new_rev)
return find_matching_signature(mc, csig, cpf);
}
EXPORT_SYMBOL_GPL(has_newer_microcode);

7
arch/x86/mm/init.c
View File

@ -699,13 +699,6 @@ void free_initmem(void)
#ifdef CONFIG_BLK_DEV_INITRD
void __init free_initrd_mem(unsigned long start, unsigned long end)
{
/*
* Remember, initrd memory may contain microcode or other useful things.
* Before we lose initrd mem, we need to find a place to hold them
* now that normal virtual memory is enabled.
*/
save_microcode_in_initrd();
/*
* end could be not aligned, and We can not align that,
* decompresser could be confused by aligned initrd_end

5
lib/earlycpio.c
View File

@ -125,7 +125,10 @@ struct cpio_data find_cpio_data(const char *path, void *data,
if ((ch[C_MODE] & 0170000) == 0100000 &&
ch[C_NAMESIZE] >= mypathsize &&
!memcmp(p, path, mypathsize)) {
*nextoff = (long)nptr - (long)data;
if (nextoff)
*nextoff = (long)nptr - (long)data;
if (ch[C_NAMESIZE] - mypathsize >= MAX_CPIO_FILE_NAME) {
pr_warn(
"File %s exceeding MAX_CPIO_FILE_NAME [%d]\n",