[PATCH 00/17] x86/microcode: Untangle loader from BLK_DEV_INITRD

[PATCH 00/17] x86/microcode: Untangle loader from BLK_DEV_INITRD

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Hi,

here are a bunch of patches untangling the loader dependency from
BLK_DEV_INITRD and fixing the builtin microcode loading on Intel. So
we're basically supporting two early-loading methods, one is the builtin
microcode in the kernel (CONFIG_EXTRA_FIRMWARE) and the detached initrd.
Both are described in Documentation/x86/early-microcode.txt.

First two are CC:stable <#4.4> so that the fallout from the merge of the
early and late loader is addressed.

The rest is smallish fixes and more cleanup to the Intel loader,
hopefully making it more readable.

Thanks.

Borislav Petkov (16):
  x86/microcode: Untangle from BLK_DEV_INITRD
  x86/microcode/intel: Make early loader look for builtin microcode too
  x86/microcode: Remove redundant __setup() param parsing
  x86/microcode: Issue update message only once
  x86/microcode/AMD: Drop redundant printk prefix
  x86/microcode/intel: Rename local variables of type struct
    mc_saved_data
  x86/microcode/intel: Rename mc_saved_count to num_saved
  x86/microcode/intel: Rename mc_intel variable to mc
  x86/microcode/intel: Move the BUG_ON up and turn it into WARN_ON
  x86/microcode/intel: Cleanup apply_microcode_intel()
  x86/microcode/intel: Use *wrmsrl variants
  x86/microcode/intel: Rename mc_saved_in_initrd
  x86/microcode/intel: Remove unused arg of
    get_matching_model_microcode()
  x86/microcode/intel: Cleanup get_matching_model_microcode()
  x86/microcode/AMD: Issue microcode updated message later
  x86/microcode: Document builtin microcode loading method

Dan Carpenter (1):
  x86/microcode: Remove an unneeded NULL check

 Documentation/x86/early-microcode.txt |  25 +++
 arch/x86/Kconfig                      |  27 ++--
 arch/x86/include/asm/microcode.h      |  26 ++++
 arch/x86/kernel/cpu/microcode/amd.c   |  11 +-
 arch/x86/kernel/cpu/microcode/core.c  |  17 +-
 arch/x86/kernel/cpu/microcode/intel.c | 281 +++++++++++++++++-----------------
 6 files changed, 213 insertions(+), 174 deletions(-)

-- 
2.3.5

[PATCH 01/17] x86/microcode: Untangle from BLK_DEV_INITRD

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Thomas Voegtle reported that doing oldconfig with a .config which has
CONFIG_MICROCODE enabled but BLK_DEV_INITRD disabled prevents the
microcode loading mechanism from being built.

So untangle it from the BLK_DEV_INITRD dependency so that oldconfig
doesn't turn it off and add an explanatory text to its Kconfig help what
the supported methods for supplying microcode are.

Reported-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org> # 4.4
---
 arch/x86/Kconfig                      | 27 ++++++++++++++-------------
 arch/x86/include/asm/microcode.h      | 26 ++++++++++++++++++++++++++
 arch/x86/kernel/cpu/microcode/intel.c | 14 ++++----------
 3 files changed, 44 insertions(+), 23 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9af2e6338400..405b1858134b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1159,22 +1159,23 @@ config MICROCODE
 	bool "CPU microcode loading support"
 	default y
 	depends on CPU_SUP_AMD || CPU_SUP_INTEL
-	depends on BLK_DEV_INITRD
 	select FW_LOADER
 	---help---
-
 	  If you say Y here, you will be able to update the microcode on
-	  certain Intel and AMD processors. The Intel support is for the
-	  IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
-	  Xeon etc. The AMD support is for families 0x10 and later. You will
-	  obviously need the actual microcode binary data itself which is not
-	  shipped with the Linux kernel.
-
-	  This option selects the general module only, you need to select
-	  at least one vendor specific module as well.
-
-	  To compile this driver as a module, choose M here: the module
-	  will be called microcode.
+	  Intel and AMD processors. The Intel support is for the IA32 family,
+	  e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
+	  AMD support is for families 0x10 and later. You will obviously need
+	  the actual microcode binary data itself which is not shipped with
+	  the Linux kernel.
+
+	  The preferred method to load microcode from a detached initrd is described
+	  in Documentation/x86/early-microcode.txt. For that you need to enable
+	  CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
+	  initrd for microcode blobs.
+
+	  In addition, you can build-in the microcode into the kernel. For that you
+	  need to enable FIRMWARE_IN_KERNEL and add the vendor-supplied microcode
+	  to the CONFIG_EXTRA_FIRMWARE config option.
 
 config MICROCODE_INTEL
 	bool "Intel microcode loading support"
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 1e1b07a5a738..9d3a96c4da78 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -3,6 +3,7 @@
 
 #include <asm/cpu.h>
 #include <linux/earlycpio.h>
+#include <linux/initrd.h>
 
 #define native_rdmsr(msr, val1, val2)			\
 do {							\
@@ -143,4 +144,29 @@ 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 */
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index ee81c544ee0d..044bbbbcbaf1 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -690,7 +690,7 @@ int __init save_microcode_in_initrd_intel(void)
 	if (count == 0)
 		return ret;
 
-	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, initrd_start, count);
+	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
 		pr_err("Cannot save microcode patches from initrd.\n");
@@ -748,20 +748,14 @@ void load_ucode_intel_ap(void)
 	struct mc_saved_data *mc_saved_data_p;
 	struct ucode_cpu_info uci;
 	unsigned long *mc_saved_in_initrd_p;
-	unsigned long initrd_start_addr;
 	enum ucode_state ret;
 #ifdef CONFIG_X86_32
-	unsigned long *initrd_start_p;
 
-	mc_saved_in_initrd_p =
-		(unsigned long *)__pa_nodebug(mc_saved_in_initrd);
+	mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
 	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
-	initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
-	initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p);
 #else
-	mc_saved_data_p = &mc_saved_data;
 	mc_saved_in_initrd_p = mc_saved_in_initrd;
-	initrd_start_addr = initrd_start;
+	mc_saved_data_p = &mc_saved_data;
 #endif
 
 	/*
@@ -773,7 +767,7 @@ void load_ucode_intel_ap(void)
 
 	collect_cpu_info_early(&uci);
 	ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
-			     initrd_start_addr, &uci);
+			     get_initrd_start_addr(), &uci);
 
 	if (ret != UCODE_OK)
 		return;
-- 
2.3.5

[tip:x86/microcode] x86/microcode: Untangle from BLK_DEV_INITRD

[tip-bot for Borislav Petkov]

Commit-ID:  5f9c01aa7c49a2d74474d6d879a797b8badf29e6
Gitweb:     http://git.kernel.org/tip/5f9c01aa7c49a2d74474d6d879a797b8badf29e6
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:29 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:15 +0100

x86/microcode: Untangle from BLK_DEV_INITRD

Thomas Voegtle reported that doing oldconfig with a .config which has
CONFIG_MICROCODE enabled but BLK_DEV_INITRD disabled prevents the
microcode loading mechanism from being built.

So untangle it from the BLK_DEV_INITRD dependency so that oldconfig
doesn't turn it off and add an explanatory text to its Kconfig help what
the supported methods for supplying microcode are.

Reported-by: Thomas Voegtle <tv@lio96.de>
Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org> # 4.4
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-2-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/Kconfig                      | 27 ++++++++++++++-------------
 arch/x86/include/asm/microcode.h      | 26 ++++++++++++++++++++++++++
 arch/x86/kernel/cpu/microcode/intel.c | 14 ++++----------
 3 files changed, 44 insertions(+), 23 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9af2e63..405b185 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1159,22 +1159,23 @@ config MICROCODE
 	bool "CPU microcode loading support"
 	default y
 	depends on CPU_SUP_AMD || CPU_SUP_INTEL
-	depends on BLK_DEV_INITRD
 	select FW_LOADER
 	---help---
-
 	  If you say Y here, you will be able to update the microcode on
-	  certain Intel and AMD processors. The Intel support is for the
-	  IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
-	  Xeon etc. The AMD support is for families 0x10 and later. You will
-	  obviously need the actual microcode binary data itself which is not
-	  shipped with the Linux kernel.
-
-	  This option selects the general module only, you need to select
-	  at least one vendor specific module as well.
-
-	  To compile this driver as a module, choose M here: the module
-	  will be called microcode.
+	  Intel and AMD processors. The Intel support is for the IA32 family,
+	  e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
+	  AMD support is for families 0x10 and later. You will obviously need
+	  the actual microcode binary data itself which is not shipped with
+	  the Linux kernel.
+
+	  The preferred method to load microcode from a detached initrd is described
+	  in Documentation/x86/early-microcode.txt. For that you need to enable
+	  CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
+	  initrd for microcode blobs.
+
+	  In addition, you can build-in the microcode into the kernel. For that you
+	  need to enable FIRMWARE_IN_KERNEL and add the vendor-supplied microcode
+	  to the CONFIG_EXTRA_FIRMWARE config option.
 
 config MICROCODE_INTEL
 	bool "Intel microcode loading support"
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 1e1b07a..9d3a96c 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -3,6 +3,7 @@
 
 #include <asm/cpu.h>
 #include <linux/earlycpio.h>
+#include <linux/initrd.h>
 
 #define native_rdmsr(msr, val1, val2)			\
 do {							\
@@ -143,4 +144,29 @@ 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 */
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index ee81c54..044bbbbc 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -690,7 +690,7 @@ int __init save_microcode_in_initrd_intel(void)
 	if (count == 0)
 		return ret;
 
-	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, initrd_start, count);
+	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
 		pr_err("Cannot save microcode patches from initrd.\n");
@@ -748,20 +748,14 @@ void load_ucode_intel_ap(void)
 	struct mc_saved_data *mc_saved_data_p;
 	struct ucode_cpu_info uci;
 	unsigned long *mc_saved_in_initrd_p;
-	unsigned long initrd_start_addr;
 	enum ucode_state ret;
 #ifdef CONFIG_X86_32
-	unsigned long *initrd_start_p;
 
-	mc_saved_in_initrd_p =
-		(unsigned long *)__pa_nodebug(mc_saved_in_initrd);
+	mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
 	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
-	initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
-	initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p);
 #else
-	mc_saved_data_p = &mc_saved_data;
 	mc_saved_in_initrd_p = mc_saved_in_initrd;
-	initrd_start_addr = initrd_start;
+	mc_saved_data_p = &mc_saved_data;
 #endif
 
 	/*
@@ -773,7 +767,7 @@ void load_ucode_intel_ap(void)
 
 	collect_cpu_info_early(&uci);
 	ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
-			     initrd_start_addr, &uci);
+			     get_initrd_start_addr(), &uci);
 
 	if (ret != UCODE_OK)
 		return;

[PATCH 02/17] x86/microcode/intel: Make early loader look for builtin microcode too

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Set the initrd @start depending on the presence of an initrd. Otherwise,
builtin microcode loading doesn't work as the start is wrong and we're
using it to compute offset to the microcode blobs.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org> # 4.4
---
 arch/x86/kernel/cpu/microcode/intel.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 044bbbbcbaf1..4f4735bd8698 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -551,10 +551,14 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
 	cd.data = NULL;
 	cd.size = 0;
 
-	cd = find_cpio_data(p, (void *)start, size, &offset);
-	if (!cd.data) {
+	/* 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(0, start, cd.data, cd.size,
@@ -728,16 +732,20 @@ void __init load_ucode_intel_bsp(void)
 	struct boot_params *p;
 
 	p	= (struct boot_params *)__pa_nodebug(&boot_params);
-	start	= p->hdr.ramdisk_image;
 	size	= p->hdr.ramdisk_size;
 
-	_load_ucode_intel_bsp(
-			(struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
-			(unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
-			start, 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_saved_in_initrd),
+			      start, size);
 #else
-	start	= boot_params.hdr.ramdisk_image + PAGE_OFFSET;
 	size	= boot_params.hdr.ramdisk_size;
+	start	= (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
 
 	_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
 #endif
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Make early loader look for builtin microcode too

[tip-bot for Borislav Petkov]

Commit-ID:  264285ac01673e70557c43ecee338ce97c4c0672
Gitweb:     http://git.kernel.org/tip/264285ac01673e70557c43ecee338ce97c4c0672
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:30 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:15 +0100

x86/microcode/intel: Make early loader look for builtin microcode too

Set the initrd @start depending on the presence of an initrd. Otherwise,
builtin microcode loading doesn't work as the start is wrong and we're
using it to compute offset to the microcode blobs.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: <stable@vger.kernel.org> # 4.4
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-3-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 044bbbbc..4f4735b 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -551,10 +551,14 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
 	cd.data = NULL;
 	cd.size = 0;
 
-	cd = find_cpio_data(p, (void *)start, size, &offset);
-	if (!cd.data) {
+	/* 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(0, start, cd.data, cd.size,
@@ -728,16 +732,20 @@ void __init load_ucode_intel_bsp(void)
 	struct boot_params *p;
 
 	p	= (struct boot_params *)__pa_nodebug(&boot_params);
-	start	= p->hdr.ramdisk_image;
 	size	= p->hdr.ramdisk_size;
 
-	_load_ucode_intel_bsp(
-			(struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
-			(unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
-			start, 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_saved_in_initrd),
+			      start, size);
 #else
-	start	= boot_params.hdr.ramdisk_image + PAGE_OFFSET;
 	size	= boot_params.hdr.ramdisk_size;
+	start	= (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
 
 	_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
 #endif

[PATCH 03/17] x86/microcode: Remove redundant __setup() param parsing

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

We do parse for the disable microcode loader chicken bit very early.
After the driver merge, the __setup() param parsing method is not needed
anymore so get rid of it.

In addition, fix a compiler warning from an old SLES11 gcc (4.3.4)
reported by Jan Beulich <jbeulich@suse.com>:

  arch/x86/kernel/cpu/microcode/core.c: In function ‘load_ucode_bsp’:
  arch/x86/kernel/cpu/microcode/core.c:96: warning: array subscript is above array bounds

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/core.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index faec7120c508..bca4e48b531d 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -43,16 +43,8 @@
 #define MICROCODE_VERSION	"2.01"
 
 static struct microcode_ops	*microcode_ops;
-
 static bool dis_ucode_ldr;
 
-static int __init disable_loader(char *str)
-{
-	dis_ucode_ldr = true;
-	return 1;
-}
-__setup("dis_ucode_ldr", disable_loader);
-
 /*
  * Synchronization.
  *
@@ -81,15 +73,16 @@ struct cpu_info_ctx {
 
 static bool __init check_loader_disabled_bsp(void)
 {
+	static const char *__dis_opt_str = "dis_ucode_ldr";
+
 #ifdef CONFIG_X86_32
 	const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
-	const char *opt	    = "dis_ucode_ldr";
-	const char *option  = (const char *)__pa_nodebug(opt);
+	const char *option  = (const char *)__pa_nodebug(__dis_opt_str);
 	bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);
 
 #else /* CONFIG_X86_64 */
 	const char *cmdline = boot_command_line;
-	const char *option  = "dis_ucode_ldr";
+	const char *option  = __dis_opt_str;
 	bool *res = &dis_ucode_ldr;
 #endif
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode: Remove redundant __setup() param parsing

[tip-bot for Borislav Petkov]

Commit-ID:  e8c8165ecfb1cfd6650777c193361d33b0f7f59e
Gitweb:     http://git.kernel.org/tip/e8c8165ecfb1cfd6650777c193361d33b0f7f59e
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:31 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:15 +0100

x86/microcode: Remove redundant __setup() param parsing

We do parse for the disable microcode loader chicken bit very early.
After the driver merge, the __setup() param parsing method is not needed
anymore so get rid of it.

In addition, fix a compiler warning from an old SLES11 gcc (4.3.4)
reported by Jan Beulich <jbeulich@suse.com>:

  arch/x86/kernel/cpu/microcode/core.c: In function ‘load_ucode_bsp’:
  arch/x86/kernel/cpu/microcode/core.c:96: warning: array subscript is above array bounds

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-4-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/core.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index faec712..bca4e48 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -43,16 +43,8 @@
 #define MICROCODE_VERSION	"2.01"
 
 static struct microcode_ops	*microcode_ops;
-
 static bool dis_ucode_ldr;
 
-static int __init disable_loader(char *str)
-{
-	dis_ucode_ldr = true;
-	return 1;
-}
-__setup("dis_ucode_ldr", disable_loader);
-
 /*
  * Synchronization.
  *
@@ -81,15 +73,16 @@ struct cpu_info_ctx {
 
 static bool __init check_loader_disabled_bsp(void)
 {
+	static const char *__dis_opt_str = "dis_ucode_ldr";
+
 #ifdef CONFIG_X86_32
 	const char *cmdline = (const char *)__pa_nodebug(boot_command_line);
-	const char *opt	    = "dis_ucode_ldr";
-	const char *option  = (const char *)__pa_nodebug(opt);
+	const char *option  = (const char *)__pa_nodebug(__dis_opt_str);
 	bool *res = (bool *)__pa_nodebug(&dis_ucode_ldr);
 
 #else /* CONFIG_X86_64 */
 	const char *cmdline = boot_command_line;
-	const char *option  = "dis_ucode_ldr";
+	const char *option  = __dis_opt_str;
 	bool *res = &dis_ucode_ldr;
 #endif
 

[PATCH 04/17] x86/microcode: Remove an unneeded NULL check

[Borislav Petkov]

From: Dan Carpenter <dan.carpenter@oracle.com>

"uci" is an element of the ucode_cpu_info[] array, it can't be NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: kernel-janitors@vger.kernel.org
Cc: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/20140120103046.GC14233@elgon.mountain
Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index bca4e48b531d..cea8552e2b3a 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -472,7 +472,7 @@ static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
 	enum ucode_state ustate;
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 
-	if (uci && uci->valid)
+	if (uci->valid)
 		return UCODE_OK;
 
 	if (collect_cpu_info(cpu))
-- 
2.3.5

[patch] x86, microcode: remove an unneeded NULL check

[Dan Carpenter]

"uci" is an element of the ucode_cpu_info[] array, it can't be NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 15c987698b0f..05db44e4198c 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -382,7 +382,7 @@ static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
 	enum ucode_state ustate;
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 
-	if (uci && uci->valid)
+	if (uci->valid)
 		return UCODE_OK;
 
 	if (collect_cpu_info(cpu))

[tip:x86/microcode] x86/microcode: Remove an unneeded NULL check

[tip-bot for Dan Carpenter]

Commit-ID:  43858f57bc02388a6420321c021397591199cf91
Gitweb:     http://git.kernel.org/tip/43858f57bc02388a6420321c021397591199cf91
Author:     Dan Carpenter <dan.carpenter@oracle.com>
AuthorDate: Wed, 3 Feb 2016 12:33:32 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:16 +0100

x86/microcode: Remove an unneeded NULL check

"uci" is an element of the ucode_cpu_info[] array, it can't be NULL.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/1454499225-21544-5-git-send-email-bp@alien8.de
Link: http://lkml.kernel.org/r/20140120103046.GC14233@elgon.mountain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index bca4e48..cea8552 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -472,7 +472,7 @@ static enum ucode_state microcode_init_cpu(int cpu, bool refresh_fw)
 	enum ucode_state ustate;
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 
-	if (uci && uci->valid)
+	if (uci->valid)
 		return UCODE_OK;
 
 	if (collect_cpu_info(cpu))

[PATCH 05/17] x86/microcode: Issue update message only once

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

This is especially annoying on large boxes:

  x86: Booting SMP configuration:
  .... node  #0, CPUs:          #1
  microcode: CPU1 microcode updated early to revision 0x428, date = 2014-05-29
     #2
  microcode: CPU2 microcode updated early to revision 0x428, date = 2014-05-29
     #3
  ...

so issue the update message only once.

$ grep microcode /proc/cpuinfo

shows whether every core got updated properly.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/amd.c   |  4 ++--
 arch/x86/kernel/cpu/microcode/intel.c | 13 +++++--------
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 2233f8a76615..5b63e2f669b0 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -432,8 +432,8 @@ int __init save_microcode_in_initrd_amd(void)
 		container = cont_va;
 
 	if (ucode_new_rev)
-		pr_info("microcode: updated early to new patch_level=0x%08x\n",
-			ucode_new_rev);
+		pr_info_once("microcode updated early to new patch_level=0x%08x\n",
+			     ucode_new_rev);
 
 	eax   = cpuid_eax(0x00000001);
 	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 4f4735bd8698..f4bc5fe00d46 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -571,14 +571,11 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
 static void
 print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
 {
-	int cpu = smp_processor_id();
-
-	pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
-		cpu,
-		uci->cpu_sig.rev,
-		date & 0xffff,
-		date >> 24,
-		(date >> 16) & 0xff);
+	pr_info_once("microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
+		     uci->cpu_sig.rev,
+		     date & 0xffff,
+		     date >> 24,
+		     (date >> 16) & 0xff);
 }
 
 #ifdef CONFIG_X86_32
-- 
2.3.5

[tip:x86/microcode] x86/microcode: Issue update message only once

[tip-bot for Borislav Petkov]

Commit-ID:  b7f500aedd4551a9bf29c617804c13f0ff18c879
Gitweb:     http://git.kernel.org/tip/b7f500aedd4551a9bf29c617804c13f0ff18c879
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:33 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:16 +0100

x86/microcode: Issue update message only once

This is especially annoying on large boxes:

  x86: Booting SMP configuration:
  .... node  #0, CPUs:          #1
  microcode: CPU1 microcode updated early to revision 0x428, date = 2014-05-29
     #2
  microcode: CPU2 microcode updated early to revision 0x428, date = 2014-05-29
     #3
  ...

so issue the update message only once.

$ grep microcode /proc/cpuinfo

shows whether every core got updated properly.

Reported-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-6-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/amd.c   |  4 ++--
 arch/x86/kernel/cpu/microcode/intel.c | 13 +++++--------
 2 files changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 2233f8a..5b63e2f 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -432,8 +432,8 @@ int __init save_microcode_in_initrd_amd(void)
 		container = cont_va;
 
 	if (ucode_new_rev)
-		pr_info("microcode: updated early to new patch_level=0x%08x\n",
-			ucode_new_rev);
+		pr_info_once("microcode updated early to new patch_level=0x%08x\n",
+			     ucode_new_rev);
 
 	eax   = cpuid_eax(0x00000001);
 	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 4f4735b..f4bc5fe 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -571,14 +571,11 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
 static void
 print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
 {
-	int cpu = smp_processor_id();
-
-	pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
-		cpu,
-		uci->cpu_sig.rev,
-		date & 0xffff,
-		date >> 24,
-		(date >> 16) & 0xff);
+	pr_info_once("microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
+		     uci->cpu_sig.rev,
+		     date & 0xffff,
+		     date >> 24,
+		     (date >> 16) & 0xff);
 }
 
 #ifdef CONFIG_X86_32

[PATCH 06/17] x86/microcode/AMD: Drop redundant printk prefix

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

It is supplied by pr_fmt already.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/amd.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 5b63e2f669b0..9f5ccef33fba 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -469,8 +469,7 @@ void reload_ucode_amd(void)
 	if (mc && rev < mc->hdr.patch_id) {
 		if (!__apply_microcode_amd(mc)) {
 			ucode_new_rev = mc->hdr.patch_id;
-			pr_info("microcode: reload patch_level=0x%08x\n",
-				ucode_new_rev);
+			pr_info("reload patch_level=0x%08x\n", ucode_new_rev);
 		}
 	}
 }
-- 
2.3.5

[tip:x86/microcode] x86/microcode/AMD: Drop redundant printk prefix

[tip-bot for Borislav Petkov]

Commit-ID:  a58017c62b5fa23e532b731e70a63ded54cc2c02
Gitweb:     http://git.kernel.org/tip/a58017c62b5fa23e532b731e70a63ded54cc2c02
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:34 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:16 +0100

x86/microcode/AMD: Drop redundant printk prefix

It is supplied by pr_fmt already.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-7-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/amd.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 5b63e2f..9f5ccef 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -469,8 +469,7 @@ void reload_ucode_amd(void)
 	if (mc && rev < mc->hdr.patch_id) {
 		if (!__apply_microcode_amd(mc)) {
 			ucode_new_rev = mc->hdr.patch_id;
-			pr_info("microcode: reload patch_level=0x%08x\n",
-				ucode_new_rev);
+			pr_info("reload patch_level=0x%08x\n", ucode_new_rev);
 		}
 	}
 }

[PATCH 07/17] x86/microcode/intel: Rename local variables of type struct mc_saved_data

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

So it is always a head-twister when trying to stare at code which has a
bunch of

  struct mc_saved_data *mc_saved_data;

local function variables *and* a global mc_saved_data of the same name.

Rename all locals to "mcs" to differentiate from the global one.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 58 ++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index f4bc5fe00d46..4af30bee2161 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -89,42 +89,39 @@ copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
 
 #ifdef CONFIG_X86_32
 static void
-microcode_phys(struct microcode_intel **mc_saved_tmp,
-	       struct mc_saved_data *mc_saved_data)
+microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
 {
 	int i;
 	struct microcode_intel ***mc_saved;
 
-	mc_saved = (struct microcode_intel ***)
-		   __pa_nodebug(&mc_saved_data->mc_saved);
-	for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
+	mc_saved = (struct microcode_intel ***)__pa_nodebug(&mcs->mc_saved);
+
+	for (i = 0; i < mcs->mc_saved_count; i++) {
 		struct microcode_intel *p;
 
-		p = *(struct microcode_intel **)
-			__pa_nodebug(mc_saved_data->mc_saved + i);
+		p = *(struct microcode_intel **)__pa_nodebug(mcs->mc_saved + i);
 		mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
 	}
 }
 #endif
 
 static enum ucode_state
-load_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
+load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	       unsigned long initrd_start, struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int count = mc_saved_data->mc_saved_count;
+	unsigned int count = mcs->mc_saved_count;
 
-	if (!mc_saved_data->mc_saved) {
+	if (!mcs->mc_saved) {
 		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
 
 		return load_microcode_early(mc_saved_tmp, count, uci);
 	} else {
 #ifdef CONFIG_X86_32
-		microcode_phys(mc_saved_tmp, mc_saved_data);
+		microcode_phys(mc_saved_tmp, mcs);
 		return load_microcode_early(mc_saved_tmp, count, uci);
 #else
-		return load_microcode_early(mc_saved_data->mc_saved,
-						    count, uci);
+		return load_microcode_early(mcs->mc_saved, count, uci);
 #endif
 	}
 }
@@ -175,7 +172,7 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
 }
 
 static int
-save_microcode(struct mc_saved_data *mc_saved_data,
+save_microcode(struct mc_saved_data *mcs,
 	       struct microcode_intel **mc_saved_src,
 	       unsigned int mc_saved_count)
 {
@@ -219,8 +216,8 @@ save_microcode(struct mc_saved_data *mc_saved_data,
 	/*
 	 * Point to newly saved microcode.
 	 */
-	mc_saved_data->mc_saved = saved_ptr;
-	mc_saved_data->mc_saved_count = mc_saved_count;
+	mcs->mc_saved	    = saved_ptr;
+	mcs->mc_saved_count = mc_saved_count;
 
 	return 0;
 
@@ -286,7 +283,7 @@ static unsigned int _save_mc(struct microcode_intel **mc_saved,
 static enum ucode_state __init
 get_matching_model_microcode(int cpu, unsigned long start,
 			     void *data, size_t size,
-			     struct mc_saved_data *mc_saved_data,
+			     struct mc_saved_data *mcs,
 			     unsigned long *mc_saved_in_initrd,
 			     struct ucode_cpu_info *uci)
 {
@@ -296,7 +293,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	unsigned int mc_size;
 	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
+	unsigned int mc_saved_count = mcs->mc_saved_count;
 	int i;
 
 	while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
@@ -342,7 +339,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	for (i = 0; i < mc_saved_count; i++)
 		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
 
-	mc_saved_data->mc_saved_count = mc_saved_count;
+	mcs->mc_saved_count = mc_saved_count;
 out:
 	return state;
 }
@@ -536,7 +533,7 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
 
 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 static __init enum ucode_state
-scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
+scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	       unsigned long start, unsigned long size,
 	       struct ucode_cpu_info *uci)
 {
@@ -562,7 +559,7 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
 	}
 
 	return get_matching_model_microcode(0, start, cd.data, cd.size,
-					    mc_saved_data, initrd, uci);
+					    mcs, initrd, uci);
 }
 
 /*
@@ -702,8 +699,7 @@ int __init save_microcode_in_initrd_intel(void)
 }
 
 static void __init
-_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
-		      unsigned long *initrd,
+_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
 		      unsigned long start, unsigned long size)
 {
 	struct ucode_cpu_info uci;
@@ -711,11 +707,11 @@ _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
 
 	collect_cpu_info_early(&uci);
 
-	ret = scan_microcode(mc_saved_data, initrd, start, size, &uci);
+	ret = scan_microcode(mcs, initrd, start, size, &uci);
 	if (ret != UCODE_OK)
 		return;
 
-	ret = load_microcode(mc_saved_data, initrd, start, &uci);
+	ret = load_microcode(mcs, initrd, start, &uci);
 	if (ret != UCODE_OK)
 		return;
 
@@ -750,28 +746,28 @@ void __init load_ucode_intel_bsp(void)
 
 void load_ucode_intel_ap(void)
 {
-	struct mc_saved_data *mc_saved_data_p;
-	struct ucode_cpu_info uci;
 	unsigned long *mc_saved_in_initrd_p;
+	struct mc_saved_data *mcs_p;
+	struct ucode_cpu_info uci;
 	enum ucode_state ret;
 #ifdef CONFIG_X86_32
 
 	mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
-	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
+	mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
 #else
 	mc_saved_in_initrd_p = mc_saved_in_initrd;
-	mc_saved_data_p = &mc_saved_data;
+	mcs_p = &mc_saved_data;
 #endif
 
 	/*
 	 * If there is no valid ucode previously saved in memory, no need to
 	 * update ucode on this AP.
 	 */
-	if (mc_saved_data_p->mc_saved_count == 0)
+	if (mcs_p->mc_saved_count == 0)
 		return;
 
 	collect_cpu_info_early(&uci);
-	ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
+	ret = load_microcode(mcs_p, mc_saved_in_initrd_p,
 			     get_initrd_start_addr(), &uci);
 
 	if (ret != UCODE_OK)
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Rename local variables of type struct mc_saved_data

[tip-bot for Borislav Petkov]

Commit-ID:  bd6fe58d8e60d45c80ed664a55ef0df5fa076014
Gitweb:     http://git.kernel.org/tip/bd6fe58d8e60d45c80ed664a55ef0df5fa076014
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:35 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:16 +0100

x86/microcode/intel: Rename local variables of type struct mc_saved_data

So it is always a head-twister when trying to stare at code which has a
bunch of

  struct mc_saved_data *mc_saved_data;

local function variables *and* a global mc_saved_data of the same name.

Rename all locals to "mcs" to differentiate from the global one.

No functionality change.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-8-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 58 ++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 31 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index f4bc5fe..4af30bee 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -89,42 +89,39 @@ copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
 
 #ifdef CONFIG_X86_32
 static void
-microcode_phys(struct microcode_intel **mc_saved_tmp,
-	       struct mc_saved_data *mc_saved_data)
+microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
 {
 	int i;
 	struct microcode_intel ***mc_saved;
 
-	mc_saved = (struct microcode_intel ***)
-		   __pa_nodebug(&mc_saved_data->mc_saved);
-	for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
+	mc_saved = (struct microcode_intel ***)__pa_nodebug(&mcs->mc_saved);
+
+	for (i = 0; i < mcs->mc_saved_count; i++) {
 		struct microcode_intel *p;
 
-		p = *(struct microcode_intel **)
-			__pa_nodebug(mc_saved_data->mc_saved + i);
+		p = *(struct microcode_intel **)__pa_nodebug(mcs->mc_saved + i);
 		mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
 	}
 }
 #endif
 
 static enum ucode_state
-load_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
+load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	       unsigned long initrd_start, struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int count = mc_saved_data->mc_saved_count;
+	unsigned int count = mcs->mc_saved_count;
 
-	if (!mc_saved_data->mc_saved) {
+	if (!mcs->mc_saved) {
 		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
 
 		return load_microcode_early(mc_saved_tmp, count, uci);
 	} else {
 #ifdef CONFIG_X86_32
-		microcode_phys(mc_saved_tmp, mc_saved_data);
+		microcode_phys(mc_saved_tmp, mcs);
 		return load_microcode_early(mc_saved_tmp, count, uci);
 #else
-		return load_microcode_early(mc_saved_data->mc_saved,
-						    count, uci);
+		return load_microcode_early(mcs->mc_saved, count, uci);
 #endif
 	}
 }
@@ -175,7 +172,7 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
 }
 
 static int
-save_microcode(struct mc_saved_data *mc_saved_data,
+save_microcode(struct mc_saved_data *mcs,
 	       struct microcode_intel **mc_saved_src,
 	       unsigned int mc_saved_count)
 {
@@ -219,8 +216,8 @@ save_microcode(struct mc_saved_data *mc_saved_data,
 	/*
 	 * Point to newly saved microcode.
 	 */
-	mc_saved_data->mc_saved = saved_ptr;
-	mc_saved_data->mc_saved_count = mc_saved_count;
+	mcs->mc_saved	    = saved_ptr;
+	mcs->mc_saved_count = mc_saved_count;
 
 	return 0;
 
@@ -286,7 +283,7 @@ static unsigned int _save_mc(struct microcode_intel **mc_saved,
 static enum ucode_state __init
 get_matching_model_microcode(int cpu, unsigned long start,
 			     void *data, size_t size,
-			     struct mc_saved_data *mc_saved_data,
+			     struct mc_saved_data *mcs,
 			     unsigned long *mc_saved_in_initrd,
 			     struct ucode_cpu_info *uci)
 {
@@ -296,7 +293,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	unsigned int mc_size;
 	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
+	unsigned int mc_saved_count = mcs->mc_saved_count;
 	int i;
 
 	while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
@@ -342,7 +339,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	for (i = 0; i < mc_saved_count; i++)
 		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
 
-	mc_saved_data->mc_saved_count = mc_saved_count;
+	mcs->mc_saved_count = mc_saved_count;
 out:
 	return state;
 }
@@ -536,7 +533,7 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
 
 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 static __init enum ucode_state
-scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
+scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	       unsigned long start, unsigned long size,
 	       struct ucode_cpu_info *uci)
 {
@@ -562,7 +559,7 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
 	}
 
 	return get_matching_model_microcode(0, start, cd.data, cd.size,
-					    mc_saved_data, initrd, uci);
+					    mcs, initrd, uci);
 }
 
 /*
@@ -702,8 +699,7 @@ int __init save_microcode_in_initrd_intel(void)
 }
 
 static void __init
-_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
-		      unsigned long *initrd,
+_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
 		      unsigned long start, unsigned long size)
 {
 	struct ucode_cpu_info uci;
@@ -711,11 +707,11 @@ _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
 
 	collect_cpu_info_early(&uci);
 
-	ret = scan_microcode(mc_saved_data, initrd, start, size, &uci);
+	ret = scan_microcode(mcs, initrd, start, size, &uci);
 	if (ret != UCODE_OK)
 		return;
 
-	ret = load_microcode(mc_saved_data, initrd, start, &uci);
+	ret = load_microcode(mcs, initrd, start, &uci);
 	if (ret != UCODE_OK)
 		return;
 
@@ -750,28 +746,28 @@ void __init load_ucode_intel_bsp(void)
 
 void load_ucode_intel_ap(void)
 {
-	struct mc_saved_data *mc_saved_data_p;
-	struct ucode_cpu_info uci;
 	unsigned long *mc_saved_in_initrd_p;
+	struct mc_saved_data *mcs_p;
+	struct ucode_cpu_info uci;
 	enum ucode_state ret;
 #ifdef CONFIG_X86_32
 
 	mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
-	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
+	mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
 #else
 	mc_saved_in_initrd_p = mc_saved_in_initrd;
-	mc_saved_data_p = &mc_saved_data;
+	mcs_p = &mc_saved_data;
 #endif
 
 	/*
 	 * If there is no valid ucode previously saved in memory, no need to
 	 * update ucode on this AP.
 	 */
-	if (mc_saved_data_p->mc_saved_count == 0)
+	if (mcs_p->mc_saved_count == 0)
 		return;
 
 	collect_cpu_info_early(&uci);
-	ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
+	ret = load_microcode(mcs_p, mc_saved_in_initrd_p,
 			     get_initrd_start_addr(), &uci);
 
 	if (ret != UCODE_OK)

[PATCH 08/17] x86/microcode/intel: Rename mc_saved_count to num_saved

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

It is shorter and easier on the eyes. Change the "== 0" tests to "!..."
while at it.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 61 ++++++++++++++++++-----------------
 1 file changed, 31 insertions(+), 30 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 4af30bee2161..9f5fe72419ba 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -41,7 +41,7 @@
 
 static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
 static struct mc_saved_data {
-	unsigned int mc_saved_count;
+	unsigned int num_saved;
 	struct microcode_intel **mc_saved;
 } mc_saved_data;
 
@@ -96,7 +96,7 @@ microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
 
 	mc_saved = (struct microcode_intel ***)__pa_nodebug(&mcs->mc_saved);
 
-	for (i = 0; i < mcs->mc_saved_count; i++) {
+	for (i = 0; i < mcs->num_saved; i++) {
 		struct microcode_intel *p;
 
 		p = *(struct microcode_intel **)__pa_nodebug(mcs->mc_saved + i);
@@ -110,7 +110,7 @@ load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	       unsigned long initrd_start, struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int count = mcs->mc_saved_count;
+	unsigned int count = mcs->num_saved;
 
 	if (!mcs->mc_saved) {
 		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
@@ -174,23 +174,23 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
 static int
 save_microcode(struct mc_saved_data *mcs,
 	       struct microcode_intel **mc_saved_src,
-	       unsigned int mc_saved_count)
+	       unsigned int num_saved)
 {
 	int i, j;
 	struct microcode_intel **saved_ptr;
 	int ret;
 
-	if (!mc_saved_count)
+	if (!num_saved)
 		return -EINVAL;
 
 	/*
 	 * Copy new microcode data.
 	 */
-	saved_ptr = kcalloc(mc_saved_count, sizeof(struct microcode_intel *), GFP_KERNEL);
+	saved_ptr = kcalloc(num_saved, sizeof(struct microcode_intel *), GFP_KERNEL);
 	if (!saved_ptr)
 		return -ENOMEM;
 
-	for (i = 0; i < mc_saved_count; i++) {
+	for (i = 0; i < num_saved; i++) {
 		struct microcode_header_intel *mc_hdr;
 		struct microcode_intel *mc;
 		unsigned long size;
@@ -216,8 +216,8 @@ save_microcode(struct mc_saved_data *mcs,
 	/*
 	 * Point to newly saved microcode.
 	 */
-	mcs->mc_saved	    = saved_ptr;
-	mcs->mc_saved_count = mc_saved_count;
+	mcs->mc_saved  = saved_ptr;
+	mcs->num_saved = num_saved;
 
 	return 0;
 
@@ -293,10 +293,10 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	unsigned int mc_size;
 	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int mc_saved_count = mcs->mc_saved_count;
+	unsigned int num_saved = mcs->num_saved;
 	int i;
 
-	while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
+	while (leftover && num_saved < ARRAY_SIZE(mc_saved_tmp)) {
 
 		if (leftover < sizeof(mc_header))
 			break;
@@ -321,7 +321,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 			continue;
 		}
 
-		mc_saved_count = _save_mc(mc_saved_tmp, ucode_ptr, mc_saved_count);
+		num_saved = _save_mc(mc_saved_tmp, ucode_ptr, num_saved);
 
 		ucode_ptr += mc_size;
 	}
@@ -331,15 +331,15 @@ get_matching_model_microcode(int cpu, unsigned long start,
 		goto out;
 	}
 
-	if (mc_saved_count == 0) {
+	if (!num_saved) {
 		state = UCODE_NFOUND;
 		goto out;
 	}
 
-	for (i = 0; i < mc_saved_count; i++)
+	for (i = 0; i < num_saved; i++)
 		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
 
-	mcs->mc_saved_count = mc_saved_count;
+	mcs->num_saved = num_saved;
 out:
 	return state;
 }
@@ -393,11 +393,11 @@ static void show_saved_mc(void)
 	unsigned int sig, pf, rev, total_size, data_size, date;
 	struct ucode_cpu_info uci;
 
-	if (mc_saved_data.mc_saved_count == 0) {
+	if (!mc_saved_data.num_saved) {
 		pr_debug("no microcode data saved.\n");
 		return;
 	}
-	pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
+	pr_debug("Total microcode saved: %d\n", mc_saved_data.num_saved);
 
 	collect_cpu_info_early(&uci);
 
@@ -406,7 +406,7 @@ static void show_saved_mc(void)
 	rev = uci.cpu_sig.rev;
 	pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev);
 
-	for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
+	for (i = 0; i < mc_saved_data.num_saved; i++) {
 		struct microcode_header_intel *mc_saved_header;
 		struct extended_sigtable *ext_header;
 		int ext_sigcount;
@@ -462,7 +462,7 @@ int save_mc_for_early(u8 *mc)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int mc_saved_count_init;
-	unsigned int mc_saved_count;
+	unsigned int num_saved;
 	struct microcode_intel **mc_saved;
 	int ret = 0;
 	int i;
@@ -473,23 +473,23 @@ int save_mc_for_early(u8 *mc)
 	 */
 	mutex_lock(&x86_cpu_microcode_mutex);
 
-	mc_saved_count_init = mc_saved_data.mc_saved_count;
-	mc_saved_count = mc_saved_data.mc_saved_count;
+	mc_saved_count_init = mc_saved_data.num_saved;
+	num_saved = mc_saved_data.num_saved;
 	mc_saved = mc_saved_data.mc_saved;
 
-	if (mc_saved && mc_saved_count)
+	if (mc_saved && num_saved)
 		memcpy(mc_saved_tmp, mc_saved,
-		       mc_saved_count * sizeof(struct microcode_intel *));
+		       num_saved * sizeof(struct microcode_intel *));
 	/*
 	 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
 	 * version.
 	 */
-	mc_saved_count = _save_mc(mc_saved_tmp, mc, mc_saved_count);
+	num_saved = _save_mc(mc_saved_tmp, mc, num_saved);
 
 	/*
 	 * Save the mc_save_tmp in global mc_saved_data.
 	 */
-	ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
+	ret = save_microcode(&mc_saved_data, mc_saved_tmp, num_saved);
 	if (ret) {
 		pr_err("Cannot save microcode patch.\n");
 		goto out;
@@ -681,14 +681,15 @@ 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.mc_saved_count;
+	unsigned int count = mc_saved_data.num_saved;
 	struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
 	int ret = 0;
 
-	if (count == 0)
+	if (!count)
 		return ret;
 
 	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
+
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
 		pr_err("Cannot save microcode patches from initrd.\n");
@@ -763,7 +764,7 @@ void load_ucode_intel_ap(void)
 	 * If there is no valid ucode previously saved in memory, no need to
 	 * update ucode on this AP.
 	 */
-	if (mcs_p->mc_saved_count == 0)
+	if (!mcs_p->num_saved)
 		return;
 
 	collect_cpu_info_early(&uci);
@@ -781,13 +782,13 @@ void reload_ucode_intel(void)
 	struct ucode_cpu_info uci;
 	enum ucode_state ret;
 
-	if (!mc_saved_data.mc_saved_count)
+	if (!mc_saved_data.num_saved)
 		return;
 
 	collect_cpu_info_early(&uci);
 
 	ret = load_microcode_early(mc_saved_data.mc_saved,
-				   mc_saved_data.mc_saved_count, &uci);
+				   mc_saved_data.num_saved, &uci);
 	if (ret != UCODE_OK)
 		return;
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Rename mc_saved_count to num_saved

[tip-bot for Borislav Petkov]

Commit-ID:  4fe9349fc3b042b481692b577bda97cde4d6f517
Gitweb:     http://git.kernel.org/tip/4fe9349fc3b042b481692b577bda97cde4d6f517
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:36 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:17 +0100

x86/microcode/intel: Rename mc_saved_count to num_saved

It is shorter and easier on the eyes. Change the "== 0" tests to "!..."
while at it.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-9-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 61 ++++++++++++++++++-----------------
 1 file changed, 31 insertions(+), 30 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 4af30bee..9f5fe72 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -41,7 +41,7 @@
 
 static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
 static struct mc_saved_data {
-	unsigned int mc_saved_count;
+	unsigned int num_saved;
 	struct microcode_intel **mc_saved;
 } mc_saved_data;
 
@@ -96,7 +96,7 @@ microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
 
 	mc_saved = (struct microcode_intel ***)__pa_nodebug(&mcs->mc_saved);
 
-	for (i = 0; i < mcs->mc_saved_count; i++) {
+	for (i = 0; i < mcs->num_saved; i++) {
 		struct microcode_intel *p;
 
 		p = *(struct microcode_intel **)__pa_nodebug(mcs->mc_saved + i);
@@ -110,7 +110,7 @@ load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	       unsigned long initrd_start, struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int count = mcs->mc_saved_count;
+	unsigned int count = mcs->num_saved;
 
 	if (!mcs->mc_saved) {
 		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
@@ -174,23 +174,23 @@ matching_model_microcode(struct microcode_header_intel *mc_header,
 static int
 save_microcode(struct mc_saved_data *mcs,
 	       struct microcode_intel **mc_saved_src,
-	       unsigned int mc_saved_count)
+	       unsigned int num_saved)
 {
 	int i, j;
 	struct microcode_intel **saved_ptr;
 	int ret;
 
-	if (!mc_saved_count)
+	if (!num_saved)
 		return -EINVAL;
 
 	/*
 	 * Copy new microcode data.
 	 */
-	saved_ptr = kcalloc(mc_saved_count, sizeof(struct microcode_intel *), GFP_KERNEL);
+	saved_ptr = kcalloc(num_saved, sizeof(struct microcode_intel *), GFP_KERNEL);
 	if (!saved_ptr)
 		return -ENOMEM;
 
-	for (i = 0; i < mc_saved_count; i++) {
+	for (i = 0; i < num_saved; i++) {
 		struct microcode_header_intel *mc_hdr;
 		struct microcode_intel *mc;
 		unsigned long size;
@@ -216,8 +216,8 @@ save_microcode(struct mc_saved_data *mcs,
 	/*
 	 * Point to newly saved microcode.
 	 */
-	mcs->mc_saved	    = saved_ptr;
-	mcs->mc_saved_count = mc_saved_count;
+	mcs->mc_saved  = saved_ptr;
+	mcs->num_saved = num_saved;
 
 	return 0;
 
@@ -293,10 +293,10 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	unsigned int mc_size;
 	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
-	unsigned int mc_saved_count = mcs->mc_saved_count;
+	unsigned int num_saved = mcs->num_saved;
 	int i;
 
-	while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
+	while (leftover && num_saved < ARRAY_SIZE(mc_saved_tmp)) {
 
 		if (leftover < sizeof(mc_header))
 			break;
@@ -321,7 +321,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 			continue;
 		}
 
-		mc_saved_count = _save_mc(mc_saved_tmp, ucode_ptr, mc_saved_count);
+		num_saved = _save_mc(mc_saved_tmp, ucode_ptr, num_saved);
 
 		ucode_ptr += mc_size;
 	}
@@ -331,15 +331,15 @@ get_matching_model_microcode(int cpu, unsigned long start,
 		goto out;
 	}
 
-	if (mc_saved_count == 0) {
+	if (!num_saved) {
 		state = UCODE_NFOUND;
 		goto out;
 	}
 
-	for (i = 0; i < mc_saved_count; i++)
+	for (i = 0; i < num_saved; i++)
 		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
 
-	mcs->mc_saved_count = mc_saved_count;
+	mcs->num_saved = num_saved;
 out:
 	return state;
 }
@@ -393,11 +393,11 @@ static void show_saved_mc(void)
 	unsigned int sig, pf, rev, total_size, data_size, date;
 	struct ucode_cpu_info uci;
 
-	if (mc_saved_data.mc_saved_count == 0) {
+	if (!mc_saved_data.num_saved) {
 		pr_debug("no microcode data saved.\n");
 		return;
 	}
-	pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
+	pr_debug("Total microcode saved: %d\n", mc_saved_data.num_saved);
 
 	collect_cpu_info_early(&uci);
 
@@ -406,7 +406,7 @@ static void show_saved_mc(void)
 	rev = uci.cpu_sig.rev;
 	pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev);
 
-	for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
+	for (i = 0; i < mc_saved_data.num_saved; i++) {
 		struct microcode_header_intel *mc_saved_header;
 		struct extended_sigtable *ext_header;
 		int ext_sigcount;
@@ -462,7 +462,7 @@ int save_mc_for_early(u8 *mc)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int mc_saved_count_init;
-	unsigned int mc_saved_count;
+	unsigned int num_saved;
 	struct microcode_intel **mc_saved;
 	int ret = 0;
 	int i;
@@ -473,23 +473,23 @@ int save_mc_for_early(u8 *mc)
 	 */
 	mutex_lock(&x86_cpu_microcode_mutex);
 
-	mc_saved_count_init = mc_saved_data.mc_saved_count;
-	mc_saved_count = mc_saved_data.mc_saved_count;
+	mc_saved_count_init = mc_saved_data.num_saved;
+	num_saved = mc_saved_data.num_saved;
 	mc_saved = mc_saved_data.mc_saved;
 
-	if (mc_saved && mc_saved_count)
+	if (mc_saved && num_saved)
 		memcpy(mc_saved_tmp, mc_saved,
-		       mc_saved_count * sizeof(struct microcode_intel *));
+		       num_saved * sizeof(struct microcode_intel *));
 	/*
 	 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
 	 * version.
 	 */
-	mc_saved_count = _save_mc(mc_saved_tmp, mc, mc_saved_count);
+	num_saved = _save_mc(mc_saved_tmp, mc, num_saved);
 
 	/*
 	 * Save the mc_save_tmp in global mc_saved_data.
 	 */
-	ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
+	ret = save_microcode(&mc_saved_data, mc_saved_tmp, num_saved);
 	if (ret) {
 		pr_err("Cannot save microcode patch.\n");
 		goto out;
@@ -681,14 +681,15 @@ 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.mc_saved_count;
+	unsigned int count = mc_saved_data.num_saved;
 	struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
 	int ret = 0;
 
-	if (count == 0)
+	if (!count)
 		return ret;
 
 	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
+
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
 		pr_err("Cannot save microcode patches from initrd.\n");
@@ -763,7 +764,7 @@ void load_ucode_intel_ap(void)
 	 * If there is no valid ucode previously saved in memory, no need to
 	 * update ucode on this AP.
 	 */
-	if (mcs_p->mc_saved_count == 0)
+	if (!mcs_p->num_saved)
 		return;
 
 	collect_cpu_info_early(&uci);
@@ -781,13 +782,13 @@ void reload_ucode_intel(void)
 	struct ucode_cpu_info uci;
 	enum ucode_state ret;
 
-	if (!mc_saved_data.mc_saved_count)
+	if (!mc_saved_data.num_saved)
 		return;
 
 	collect_cpu_info_early(&uci);
 
 	ret = load_microcode_early(mc_saved_data.mc_saved,
-				   mc_saved_data.mc_saved_count, &uci);
+				   mc_saved_data.num_saved, &uci);
 	if (ret != UCODE_OK)
 		return;
 

[PATCH 09/17] x86/microcode/intel: Rename mc_intel variable to mc

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Well, it is apparent what it points to - microcode. And since it is the
intel loader, no need for the "_intel" suffix. Use "!" for the 0/NULL
checks, while at it.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 58 +++++++++++++++++------------------
 1 file changed, 29 insertions(+), 29 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 9f5fe72419ba..d1b2f583f543 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -601,19 +601,19 @@ void show_ucode_info_early(void)
  */
 static void print_ucode(struct ucode_cpu_info *uci)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 	int *delay_ucode_info_p;
 	int *current_mc_date_p;
 
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
+	mc = uci->mc;
+	if (!mc)
 		return;
 
 	delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
 	current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);
 
 	*delay_ucode_info_p = 1;
-	*current_mc_date_p = mc_intel->hdr.date;
+	*current_mc_date_p = mc->hdr.date;
 }
 #else
 
@@ -628,29 +628,29 @@ static inline void flush_tlb_early(void)
 
 static inline void print_ucode(struct ucode_cpu_info *uci)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
+	mc = uci->mc;
+	if (!mc)
 		return;
 
-	print_ucode_info(uci, mc_intel->hdr.date);
+	print_ucode_info(uci, mc->hdr.date);
 }
 #endif
 
 static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 	unsigned int val[2];
 
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
+	mc = uci->mc;
+	if (!mc)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
 	native_wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc_intel->bits,
-	      (unsigned long) mc_intel->bits >> 16 >> 16);
+	      (unsigned long)mc->bits,
+	      (unsigned long)mc->bits >> 16 >> 16);
 	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
@@ -658,7 +658,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 
 	/* get the current revision from MSR 0x8B */
 	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
-	if (val[1] != mc_intel->hdr.rev)
+	if (val[1] != mc->hdr.rev)
 		return -1;
 
 #ifdef CONFIG_X86_64
@@ -670,7 +670,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 	if (early)
 		print_ucode(uci);
 	else
-		print_ucode_info(uci, mc_intel->hdr.date);
+		print_ucode_info(uci, mc->hdr.date);
 
 	return 0;
 }
@@ -821,7 +821,7 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
  * return 0 - no update found
  * return 1 - found update
  */
-static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
+static int get_matching_mc(struct microcode_intel *mc, int cpu)
 {
 	struct cpu_signature cpu_sig;
 	unsigned int csig, cpf, crev;
@@ -832,38 +832,38 @@ static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
 	cpf = cpu_sig.pf;
 	crev = cpu_sig.rev;
 
-	return has_newer_microcode(mc_intel, csig, cpf, crev);
+	return has_newer_microcode(mc, csig, cpf, crev);
 }
 
 static int apply_microcode_intel(int cpu)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 	struct ucode_cpu_info *uci;
 	unsigned int val[2];
 	int cpu_num = raw_smp_processor_id();
 	struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
 	uci = ucode_cpu_info + cpu;
-	mc_intel = uci->mc;
+	mc = uci->mc;
 
 	/* We should bind the task to the CPU */
 	BUG_ON(cpu_num != cpu);
 
-	if (mc_intel == NULL)
+	if (!mc)
 		return 0;
 
 	/*
 	 * Microcode on this CPU could be updated earlier. Only apply the
-	 * microcode patch in mc_intel when it is newer than the one on this
+	 * microcode patch in mc when it is newer than the one on this
 	 * CPU.
 	 */
-	if (get_matching_mc(mc_intel, cpu) == 0)
+	if (!get_matching_mc(mc, cpu))
 		return 0;
 
 	/* write microcode via MSR 0x79 */
 	wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc_intel->bits,
-	      (unsigned long) mc_intel->bits >> 16 >> 16);
+	      (unsigned long) mc->bits,
+	      (unsigned long) mc->bits >> 16 >> 16);
 	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
@@ -872,16 +872,16 @@ static int apply_microcode_intel(int cpu)
 	/* get the current revision from MSR 0x8B */
 	rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 
-	if (val[1] != mc_intel->hdr.rev) {
+	if (val[1] != mc->hdr.rev) {
 		pr_err("CPU%d update to revision 0x%x failed\n",
-		       cpu_num, mc_intel->hdr.rev);
+		       cpu_num, mc->hdr.rev);
 		return -1;
 	}
 	pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
 		cpu_num, val[1],
-		mc_intel->hdr.date & 0xffff,
-		mc_intel->hdr.date >> 24,
-		(mc_intel->hdr.date >> 16) & 0xff);
+		mc->hdr.date & 0xffff,
+		mc->hdr.date >> 24,
+		(mc->hdr.date >> 16) & 0xff);
 
 	uci->cpu_sig.rev = val[1];
 	c->microcode = val[1];
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Rename mc_intel variable to mc

[tip-bot for Borislav Petkov]

Commit-ID:  de778275c295825e6638f3f74103f40642d45caa
Gitweb:     http://git.kernel.org/tip/de778275c295825e6638f3f74103f40642d45caa
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:37 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:17 +0100

x86/microcode/intel: Rename mc_intel variable to mc

Well, it is apparent what it points to - microcode. And since it is the
intel loader, no need for the "_intel" suffix. Use "!" for the 0/NULL
checks, while at it.

No functionality change.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-10-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 58 +++++++++++++++++------------------
 1 file changed, 29 insertions(+), 29 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 9f5fe72..d1b2f58 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -601,19 +601,19 @@ void show_ucode_info_early(void)
  */
 static void print_ucode(struct ucode_cpu_info *uci)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 	int *delay_ucode_info_p;
 	int *current_mc_date_p;
 
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
+	mc = uci->mc;
+	if (!mc)
 		return;
 
 	delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
 	current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);
 
 	*delay_ucode_info_p = 1;
-	*current_mc_date_p = mc_intel->hdr.date;
+	*current_mc_date_p = mc->hdr.date;
 }
 #else
 
@@ -628,29 +628,29 @@ static inline void flush_tlb_early(void)
 
 static inline void print_ucode(struct ucode_cpu_info *uci)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
+	mc = uci->mc;
+	if (!mc)
 		return;
 
-	print_ucode_info(uci, mc_intel->hdr.date);
+	print_ucode_info(uci, mc->hdr.date);
 }
 #endif
 
 static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 	unsigned int val[2];
 
-	mc_intel = uci->mc;
-	if (mc_intel == NULL)
+	mc = uci->mc;
+	if (!mc)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
 	native_wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc_intel->bits,
-	      (unsigned long) mc_intel->bits >> 16 >> 16);
+	      (unsigned long)mc->bits,
+	      (unsigned long)mc->bits >> 16 >> 16);
 	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
@@ -658,7 +658,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 
 	/* get the current revision from MSR 0x8B */
 	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
-	if (val[1] != mc_intel->hdr.rev)
+	if (val[1] != mc->hdr.rev)
 		return -1;
 
 #ifdef CONFIG_X86_64
@@ -670,7 +670,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 	if (early)
 		print_ucode(uci);
 	else
-		print_ucode_info(uci, mc_intel->hdr.date);
+		print_ucode_info(uci, mc->hdr.date);
 
 	return 0;
 }
@@ -821,7 +821,7 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
  * return 0 - no update found
  * return 1 - found update
  */
-static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
+static int get_matching_mc(struct microcode_intel *mc, int cpu)
 {
 	struct cpu_signature cpu_sig;
 	unsigned int csig, cpf, crev;
@@ -832,38 +832,38 @@ static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
 	cpf = cpu_sig.pf;
 	crev = cpu_sig.rev;
 
-	return has_newer_microcode(mc_intel, csig, cpf, crev);
+	return has_newer_microcode(mc, csig, cpf, crev);
 }
 
 static int apply_microcode_intel(int cpu)
 {
-	struct microcode_intel *mc_intel;
+	struct microcode_intel *mc;
 	struct ucode_cpu_info *uci;
 	unsigned int val[2];
 	int cpu_num = raw_smp_processor_id();
 	struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
 	uci = ucode_cpu_info + cpu;
-	mc_intel = uci->mc;
+	mc = uci->mc;
 
 	/* We should bind the task to the CPU */
 	BUG_ON(cpu_num != cpu);
 
-	if (mc_intel == NULL)
+	if (!mc)
 		return 0;
 
 	/*
 	 * Microcode on this CPU could be updated earlier. Only apply the
-	 * microcode patch in mc_intel when it is newer than the one on this
+	 * microcode patch in mc when it is newer than the one on this
 	 * CPU.
 	 */
-	if (get_matching_mc(mc_intel, cpu) == 0)
+	if (!get_matching_mc(mc, cpu))
 		return 0;
 
 	/* write microcode via MSR 0x79 */
 	wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc_intel->bits,
-	      (unsigned long) mc_intel->bits >> 16 >> 16);
+	      (unsigned long) mc->bits,
+	      (unsigned long) mc->bits >> 16 >> 16);
 	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
@@ -872,16 +872,16 @@ static int apply_microcode_intel(int cpu)
 	/* get the current revision from MSR 0x8B */
 	rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 
-	if (val[1] != mc_intel->hdr.rev) {
+	if (val[1] != mc->hdr.rev) {
 		pr_err("CPU%d update to revision 0x%x failed\n",
-		       cpu_num, mc_intel->hdr.rev);
+		       cpu_num, mc->hdr.rev);
 		return -1;
 	}
 	pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
 		cpu_num, val[1],
-		mc_intel->hdr.date & 0xffff,
-		mc_intel->hdr.date >> 24,
-		(mc_intel->hdr.date >> 16) & 0xff);
+		mc->hdr.date & 0xffff,
+		mc->hdr.date >> 24,
+		(mc->hdr.date >> 16) & 0xff);
 
 	uci->cpu_sig.rev = val[1];
 	c->microcode = val[1];

[PATCH 10/17] x86/microcode/intel: Move the BUG_ON up and turn it into WARN_ON

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

If we're going to BUG_ON() because we're running on the wrong CPU, we
better do it as the first thing we do when entering that function. And
also, turn it into a WARN_ON() because it is not worth to panic the
system if we apply the microcode on the wrong CPU - we're simply going
to exit early.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index d1b2f583f543..c029c2bb2a29 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -843,12 +843,12 @@ static int apply_microcode_intel(int cpu)
 	int cpu_num = raw_smp_processor_id();
 	struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
-	uci = ucode_cpu_info + cpu;
-	mc = uci->mc;
-
 	/* We should bind the task to the CPU */
-	BUG_ON(cpu_num != cpu);
+	if (WARN_ON(cpu_num != cpu))
+		return -1;
 
+	uci = ucode_cpu_info + cpu;
+	mc = uci->mc;
 	if (!mc)
 		return 0;
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Move the BUG_ON up and turn it into WARN_ON

[tip-bot for Borislav Petkov]

Commit-ID:  58b5f2cc4bdbc9b616e68639f5a84886aa5be590
Gitweb:     http://git.kernel.org/tip/58b5f2cc4bdbc9b616e68639f5a84886aa5be590
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:38 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:17 +0100

x86/microcode/intel: Move the BUG_ON up and turn it into WARN_ON

If we're going to BUG_ON() because we're running on the wrong CPU, we
better do it as the first thing we do when entering that function. And
also, turn it into a WARN_ON() because it is not worth to panic the
system if we apply the microcode on the wrong CPU - we're simply going
to exit early.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-11-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index d1b2f58..c029c2b 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -843,12 +843,12 @@ static int apply_microcode_intel(int cpu)
 	int cpu_num = raw_smp_processor_id();
 	struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
-	uci = ucode_cpu_info + cpu;
-	mc = uci->mc;
-
 	/* We should bind the task to the CPU */
-	BUG_ON(cpu_num != cpu);
+	if (WARN_ON(cpu_num != cpu))
+		return -1;
 
+	uci = ucode_cpu_info + cpu;
+	mc = uci->mc;
 	if (!mc)
 		return 0;
 

[PATCH 11/17] x86/microcode/intel: Cleanup apply_microcode_intel()

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Get rid of local variable cpu_num as it is equal to @cpu now. Deref
cpu_data() only when it is really needed at the end.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index c029c2bb2a29..35186a0dd5fc 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -839,12 +839,11 @@ static int apply_microcode_intel(int cpu)
 {
 	struct microcode_intel *mc;
 	struct ucode_cpu_info *uci;
+	struct cpuinfo_x86 *c;
 	unsigned int val[2];
-	int cpu_num = raw_smp_processor_id();
-	struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
 	/* We should bind the task to the CPU */
-	if (WARN_ON(cpu_num != cpu))
+	if (WARN_ON(raw_smp_processor_id() != cpu))
 		return -1;
 
 	uci = ucode_cpu_info + cpu;
@@ -874,15 +873,18 @@ static int apply_microcode_intel(int cpu)
 
 	if (val[1] != mc->hdr.rev) {
 		pr_err("CPU%d update to revision 0x%x failed\n",
-		       cpu_num, mc->hdr.rev);
+		       cpu, mc->hdr.rev);
 		return -1;
 	}
+
 	pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
-		cpu_num, val[1],
+		cpu, val[1],
 		mc->hdr.date & 0xffff,
 		mc->hdr.date >> 24,
 		(mc->hdr.date >> 16) & 0xff);
 
+	c = &cpu_data(cpu);
+
 	uci->cpu_sig.rev = val[1];
 	c->microcode = val[1];
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Cleanup apply_microcode_intel()

[tip-bot for Borislav Petkov]

Commit-ID:  26cbaa4dc676a444aa626cbc642c4c8181ef1378
Gitweb:     http://git.kernel.org/tip/26cbaa4dc676a444aa626cbc642c4c8181ef1378
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:39 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:17 +0100

x86/microcode/intel: Cleanup apply_microcode_intel()

Get rid of local variable cpu_num as it is equal to @cpu now. Deref
cpu_data() only when it is really needed at the end.

No functionality change.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-12-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index c029c2b..35186a0 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -839,12 +839,11 @@ static int apply_microcode_intel(int cpu)
 {
 	struct microcode_intel *mc;
 	struct ucode_cpu_info *uci;
+	struct cpuinfo_x86 *c;
 	unsigned int val[2];
-	int cpu_num = raw_smp_processor_id();
-	struct cpuinfo_x86 *c = &cpu_data(cpu_num);
 
 	/* We should bind the task to the CPU */
-	if (WARN_ON(cpu_num != cpu))
+	if (WARN_ON(raw_smp_processor_id() != cpu))
 		return -1;
 
 	uci = ucode_cpu_info + cpu;
@@ -874,15 +873,18 @@ static int apply_microcode_intel(int cpu)
 
 	if (val[1] != mc->hdr.rev) {
 		pr_err("CPU%d update to revision 0x%x failed\n",
-		       cpu_num, mc->hdr.rev);
+		       cpu, mc->hdr.rev);
 		return -1;
 	}
+
 	pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
-		cpu_num, val[1],
+		cpu, val[1],
 		mc->hdr.date & 0xffff,
 		mc->hdr.date >> 24,
 		(mc->hdr.date >> 16) & 0xff);
 
+	c = &cpu_data(cpu);
+
 	uci->cpu_sig.rev = val[1];
 	c->microcode = val[1];
 

[PATCH 12/17] x86/microcode/intel: Use *wrmsrl variants

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

... and drop the 32-bit casting games which we had to do at the time
because wrmsr() was unforgiving then, see c3fd0bd5e19a from the
full history tree:

  commit c3fd0bd5e19aaff9cdd104edff136a2023db657e
  Author: Linus Torvalds <torvalds@home.osdl.org>
  Date:   Tue Feb 17 23:23:41 2004 -0800

    Fix up the microcode update on regular 32-bit x86. Our wrmsr()
    is a bit unforgiving and really doesn't like 64-bit values.
    ...

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 35186a0dd5fc..ff0b44951d12 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -370,7 +370,7 @@ static int collect_cpu_info_early(struct ucode_cpu_info *uci)
 		native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 		csig.pf = 1 << ((val[1] >> 18) & 7);
 	}
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
@@ -648,10 +648,8 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
-	native_wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long)mc->bits,
-	      (unsigned long)mc->bits >> 16 >> 16);
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
@@ -860,10 +858,8 @@ static int apply_microcode_intel(int cpu)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
-	wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc->bits,
-	      (unsigned long) mc->bits >> 16 >> 16);
-	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+	wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Use *wrmsrl variants

[tip-bot for Borislav Petkov]

Commit-ID:  c416e6117575213a5a962149620684a09f9e4ece
Gitweb:     http://git.kernel.org/tip/c416e6117575213a5a962149620684a09f9e4ece
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:40 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:17 +0100

x86/microcode/intel: Use *wrmsrl variants

... and drop the 32-bit casting games which we had to do at the time
because wrmsr() was unforgiving then, see c3fd0bd5e19a from the
full history tree:

  commit c3fd0bd5e19aaff9cdd104edff136a2023db657e
  Author: Linus Torvalds <torvalds@home.osdl.org>
  Date:   Tue Feb 17 23:23:41 2004 -0800

    Fix up the microcode update on regular 32-bit x86. Our wrmsr()
    is a bit unforgiving and really doesn't like 64-bit values.
    ...

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-13-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 35186a0..ff0b449 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -370,7 +370,7 @@ static int collect_cpu_info_early(struct ucode_cpu_info *uci)
 		native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 		csig.pf = 1 << ((val[1] >> 18) & 7);
 	}
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
@@ -648,10 +648,8 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
-	native_wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long)mc->bits,
-	      (unsigned long)mc->bits >> 16 >> 16);
-	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	native_wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+	native_wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();
@@ -860,10 +858,8 @@ static int apply_microcode_intel(int cpu)
 		return 0;
 
 	/* write microcode via MSR 0x79 */
-	wrmsr(MSR_IA32_UCODE_WRITE,
-	      (unsigned long) mc->bits,
-	      (unsigned long) mc->bits >> 16 >> 16);
-	wrmsr(MSR_IA32_UCODE_REV, 0, 0);
+	wrmsrl(MSR_IA32_UCODE_WRITE, (unsigned long)mc->bits);
+	wrmsrl(MSR_IA32_UCODE_REV, 0);
 
 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();

[PATCH 13/17] x86/microcode/intel: Rename mc_saved_in_initrd

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Rename it to mc_tmp_ptrs to denote better what it is - a temporary array
for saving pointers to microcode blobs. And "initrd" is not accurate
anymore since initrd is not the only source for early microcode.
Therefore, rename copy_initrd_ptrs() to copy_ptrs() simply and
"initrd_start" to "offset".

And then do the following convention: the global variable is called
"mc_tmp_ptrs" and the local function arguments "mc_ptrs" for
differentiation.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 52 +++++++++++++++++++----------------
 1 file changed, 28 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index ff0b44951d12..5970758bbcdd 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -39,7 +39,13 @@
 #include <asm/setup.h>
 #include <asm/msr.h>
 
-static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
+/*
+ * 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.
+ */
+static unsigned long mc_tmp_ptrs[MAX_UCODE_COUNT];
+
 static struct mc_saved_data {
 	unsigned int num_saved;
 	struct microcode_intel **mc_saved;
@@ -78,13 +84,13 @@ load_microcode_early(struct microcode_intel **saved,
 }
 
 static inline void
-copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
-		  unsigned long off, int num_saved)
+copy_ptrs(struct microcode_intel **mc_saved, unsigned long *mc_ptrs,
+	  unsigned long off, int num_saved)
 {
 	int i;
 
 	for (i = 0; i < num_saved; i++)
-		mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
+		mc_saved[i] = (struct microcode_intel *)(mc_ptrs[i] + off);
 }
 
 #ifdef CONFIG_X86_32
@@ -106,14 +112,14 @@ microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
 #endif
 
 static enum ucode_state
-load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
-	       unsigned long initrd_start, struct ucode_cpu_info *uci)
+load_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
+	       unsigned long offset, struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int count = mcs->num_saved;
 
 	if (!mcs->mc_saved) {
-		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
+		copy_ptrs(mc_saved_tmp, mc_ptrs, offset, count);
 
 		return load_microcode_early(mc_saved_tmp, count, uci);
 	} else {
@@ -284,7 +290,7 @@ static enum ucode_state __init
 get_matching_model_microcode(int cpu, unsigned long start,
 			     void *data, size_t size,
 			     struct mc_saved_data *mcs,
-			     unsigned long *mc_saved_in_initrd,
+			     unsigned long *mc_ptrs,
 			     struct ucode_cpu_info *uci)
 {
 	u8 *ucode_ptr = data;
@@ -337,7 +343,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	}
 
 	for (i = 0; i < num_saved; i++)
-		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
+		mc_ptrs[i] = (unsigned long)mc_saved_tmp[i] - start;
 
 	mcs->num_saved = num_saved;
 out:
@@ -533,7 +539,7 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
 
 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 static __init enum ucode_state
-scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
+scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 	       unsigned long start, unsigned long size,
 	       struct ucode_cpu_info *uci)
 {
@@ -559,7 +565,7 @@ scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	}
 
 	return get_matching_model_microcode(0, start, cd.data, cd.size,
-					    mcs, initrd, uci);
+					    mcs, mc_ptrs, uci);
 }
 
 /*
@@ -675,7 +681,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 
 /*
  * This function converts microcode patch offsets previously stored in
- * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
+ * mc_tmp_ptrs to pointers and stores the pointers in mc_saved_data.
  */
 int __init save_microcode_in_initrd_intel(void)
 {
@@ -686,7 +692,7 @@ int __init save_microcode_in_initrd_intel(void)
 	if (!count)
 		return ret;
 
-	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
+	copy_ptrs(mc_saved, mc_tmp_ptrs, get_initrd_start(), count);
 
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
@@ -698,7 +704,7 @@ int __init save_microcode_in_initrd_intel(void)
 }
 
 static void __init
-_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
+_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 		      unsigned long start, unsigned long size)
 {
 	struct ucode_cpu_info uci;
@@ -706,11 +712,11 @@ _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
 
 	collect_cpu_info_early(&uci);
 
-	ret = scan_microcode(mcs, initrd, start, size, &uci);
+	ret = scan_microcode(mcs, mc_ptrs, start, size, &uci);
 	if (ret != UCODE_OK)
 		return;
 
-	ret = load_microcode(mcs, initrd, start, &uci);
+	ret = load_microcode(mcs, mc_ptrs, start, &uci);
 	if (ret != UCODE_OK)
 		return;
 
@@ -733,28 +739,28 @@ void __init load_ucode_intel_bsp(void)
 	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_saved_in_initrd),
+			      (unsigned long *)__pa_nodebug(&mc_tmp_ptrs),
 			      start, size);
 #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_saved_in_initrd, start, size);
+	_load_ucode_intel_bsp(&mc_saved_data, mc_tmp_ptrs, start, size);
 #endif
 }
 
 void load_ucode_intel_ap(void)
 {
-	unsigned long *mc_saved_in_initrd_p;
+	unsigned long *mcs_tmp_p;
 	struct mc_saved_data *mcs_p;
 	struct ucode_cpu_info uci;
 	enum ucode_state ret;
 #ifdef CONFIG_X86_32
 
-	mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
+	mcs_tmp_p = (unsigned long *)__pa_nodebug(mc_tmp_ptrs);
 	mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
 #else
-	mc_saved_in_initrd_p = mc_saved_in_initrd;
+	mcs_tmp_p = mc_tmp_ptrs;
 	mcs_p = &mc_saved_data;
 #endif
 
@@ -766,9 +772,7 @@ void load_ucode_intel_ap(void)
 		return;
 
 	collect_cpu_info_early(&uci);
-	ret = load_microcode(mcs_p, mc_saved_in_initrd_p,
-			     get_initrd_start_addr(), &uci);
-
+	ret = load_microcode(mcs_p, mcs_tmp_p, get_initrd_start_addr(), &uci);
 	if (ret != UCODE_OK)
 		return;
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Rename mc_saved_in_initrd

[tip-bot for Borislav Petkov]

Commit-ID:  f8bb45e2c4acf1395bb6e61a135ce8c9107388cf
Gitweb:     http://git.kernel.org/tip/f8bb45e2c4acf1395bb6e61a135ce8c9107388cf
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:41 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:18 +0100

x86/microcode/intel: Rename mc_saved_in_initrd

Rename it to mc_tmp_ptrs to denote better what it is - a temporary array
for saving pointers to microcode blobs. And "initrd" is not accurate
anymore since initrd is not the only source for early microcode.
Therefore, rename copy_initrd_ptrs() to copy_ptrs() simply and
"initrd_start" to "offset".

And then do the following convention: the global variable is called
"mc_tmp_ptrs" and the local function arguments "mc_ptrs" for
differentiation.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-14-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 52 +++++++++++++++++++----------------
 1 file changed, 28 insertions(+), 24 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index ff0b449..5970758 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -39,7 +39,13 @@
 #include <asm/setup.h>
 #include <asm/msr.h>
 
-static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
+/*
+ * 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.
+ */
+static unsigned long mc_tmp_ptrs[MAX_UCODE_COUNT];
+
 static struct mc_saved_data {
 	unsigned int num_saved;
 	struct microcode_intel **mc_saved;
@@ -78,13 +84,13 @@ load_microcode_early(struct microcode_intel **saved,
 }
 
 static inline void
-copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
-		  unsigned long off, int num_saved)
+copy_ptrs(struct microcode_intel **mc_saved, unsigned long *mc_ptrs,
+	  unsigned long off, int num_saved)
 {
 	int i;
 
 	for (i = 0; i < num_saved; i++)
-		mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
+		mc_saved[i] = (struct microcode_intel *)(mc_ptrs[i] + off);
 }
 
 #ifdef CONFIG_X86_32
@@ -106,14 +112,14 @@ microcode_phys(struct microcode_intel **mc_saved_tmp, struct mc_saved_data *mcs)
 #endif
 
 static enum ucode_state
-load_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
-	       unsigned long initrd_start, struct ucode_cpu_info *uci)
+load_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
+	       unsigned long offset, struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int count = mcs->num_saved;
 
 	if (!mcs->mc_saved) {
-		copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
+		copy_ptrs(mc_saved_tmp, mc_ptrs, offset, count);
 
 		return load_microcode_early(mc_saved_tmp, count, uci);
 	} else {
@@ -284,7 +290,7 @@ static enum ucode_state __init
 get_matching_model_microcode(int cpu, unsigned long start,
 			     void *data, size_t size,
 			     struct mc_saved_data *mcs,
-			     unsigned long *mc_saved_in_initrd,
+			     unsigned long *mc_ptrs,
 			     struct ucode_cpu_info *uci)
 {
 	u8 *ucode_ptr = data;
@@ -337,7 +343,7 @@ get_matching_model_microcode(int cpu, unsigned long start,
 	}
 
 	for (i = 0; i < num_saved; i++)
-		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
+		mc_ptrs[i] = (unsigned long)mc_saved_tmp[i] - start;
 
 	mcs->num_saved = num_saved;
 out:
@@ -533,7 +539,7 @@ static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
 
 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 static __init enum ucode_state
-scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
+scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 	       unsigned long start, unsigned long size,
 	       struct ucode_cpu_info *uci)
 {
@@ -559,7 +565,7 @@ scan_microcode(struct mc_saved_data *mcs, unsigned long *initrd,
 	}
 
 	return get_matching_model_microcode(0, start, cd.data, cd.size,
-					    mcs, initrd, uci);
+					    mcs, mc_ptrs, uci);
 }
 
 /*
@@ -675,7 +681,7 @@ static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
 
 /*
  * This function converts microcode patch offsets previously stored in
- * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
+ * mc_tmp_ptrs to pointers and stores the pointers in mc_saved_data.
  */
 int __init save_microcode_in_initrd_intel(void)
 {
@@ -686,7 +692,7 @@ int __init save_microcode_in_initrd_intel(void)
 	if (!count)
 		return ret;
 
-	copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
+	copy_ptrs(mc_saved, mc_tmp_ptrs, get_initrd_start(), count);
 
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
@@ -698,7 +704,7 @@ int __init save_microcode_in_initrd_intel(void)
 }
 
 static void __init
-_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
+_load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 		      unsigned long start, unsigned long size)
 {
 	struct ucode_cpu_info uci;
@@ -706,11 +712,11 @@ _load_ucode_intel_bsp(struct mc_saved_data *mcs, unsigned long *initrd,
 
 	collect_cpu_info_early(&uci);
 
-	ret = scan_microcode(mcs, initrd, start, size, &uci);
+	ret = scan_microcode(mcs, mc_ptrs, start, size, &uci);
 	if (ret != UCODE_OK)
 		return;
 
-	ret = load_microcode(mcs, initrd, start, &uci);
+	ret = load_microcode(mcs, mc_ptrs, start, &uci);
 	if (ret != UCODE_OK)
 		return;
 
@@ -733,28 +739,28 @@ void __init load_ucode_intel_bsp(void)
 	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_saved_in_initrd),
+			      (unsigned long *)__pa_nodebug(&mc_tmp_ptrs),
 			      start, size);
 #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_saved_in_initrd, start, size);
+	_load_ucode_intel_bsp(&mc_saved_data, mc_tmp_ptrs, start, size);
 #endif
 }
 
 void load_ucode_intel_ap(void)
 {
-	unsigned long *mc_saved_in_initrd_p;
+	unsigned long *mcs_tmp_p;
 	struct mc_saved_data *mcs_p;
 	struct ucode_cpu_info uci;
 	enum ucode_state ret;
 #ifdef CONFIG_X86_32
 
-	mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
+	mcs_tmp_p = (unsigned long *)__pa_nodebug(mc_tmp_ptrs);
 	mcs_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
 #else
-	mc_saved_in_initrd_p = mc_saved_in_initrd;
+	mcs_tmp_p = mc_tmp_ptrs;
 	mcs_p = &mc_saved_data;
 #endif
 
@@ -766,9 +772,7 @@ void load_ucode_intel_ap(void)
 		return;
 
 	collect_cpu_info_early(&uci);
-	ret = load_microcode(mcs_p, mc_saved_in_initrd_p,
-			     get_initrd_start_addr(), &uci);
-
+	ret = load_microcode(mcs_p, mcs_tmp_p, get_initrd_start_addr(), &uci);
 	if (ret != UCODE_OK)
 		return;
 

[PATCH 14/17] x86/microcode/intel: Remove unused arg of get_matching_model_microcode()

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

@cpu is unused, kill it.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 5970758bbcdd..0c67fd060680 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -287,7 +287,7 @@ static unsigned int _save_mc(struct microcode_intel **mc_saved,
  * BSP can stay in the platform.
  */
 static enum ucode_state __init
-get_matching_model_microcode(int cpu, unsigned long start,
+get_matching_model_microcode(unsigned long start,
 			     void *data, size_t size,
 			     struct mc_saved_data *mcs,
 			     unsigned long *mc_ptrs,
@@ -564,7 +564,7 @@ scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 			return UCODE_ERROR;
 	}
 
-	return get_matching_model_microcode(0, start, cd.data, cd.size,
+	return get_matching_model_microcode(start, cd.data, cd.size,
 					    mcs, mc_ptrs, uci);
 }
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Remove unused arg of get_matching_model_microcode()

[tip-bot for Borislav Petkov]

Commit-ID:  2f303c524ed021825671cfa9b1934338bc04f8ab
Gitweb:     http://git.kernel.org/tip/2f303c524ed021825671cfa9b1934338bc04f8ab
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:42 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:18 +0100

x86/microcode/intel: Remove unused arg of get_matching_model_microcode()

@cpu is unused, kill it.

No functionality change.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-15-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 5970758..0c67fd0 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -287,7 +287,7 @@ static unsigned int _save_mc(struct microcode_intel **mc_saved,
  * BSP can stay in the platform.
  */
 static enum ucode_state __init
-get_matching_model_microcode(int cpu, unsigned long start,
+get_matching_model_microcode(unsigned long start,
 			     void *data, size_t size,
 			     struct mc_saved_data *mcs,
 			     unsigned long *mc_ptrs,
@@ -564,7 +564,7 @@ scan_microcode(struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 			return UCODE_ERROR;
 	}
 
-	return get_matching_model_microcode(0, start, cd.data, cd.size,
+	return get_matching_model_microcode(start, cd.data, cd.size,
 					    mcs, mc_ptrs, uci);
 }
 

[PATCH 15/17] x86/microcode/intel: Cleanup get_matching_model_microcode()

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Reflow arguments, sort local variables in reverse christmas tree, kill
"out" label.

No functionality change.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 0c67fd060680..cb397947f688 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -287,19 +287,17 @@ static unsigned int _save_mc(struct microcode_intel **mc_saved,
  * BSP can stay in the platform.
  */
 static enum ucode_state __init
-get_matching_model_microcode(unsigned long start,
-			     void *data, size_t size,
-			     struct mc_saved_data *mcs,
-			     unsigned long *mc_ptrs,
+get_matching_model_microcode(unsigned long start, void *data, size_t size,
+			     struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 			     struct ucode_cpu_info *uci)
 {
-	u8 *ucode_ptr = data;
-	unsigned int leftover = size;
-	enum ucode_state state = UCODE_OK;
-	unsigned int mc_size;
-	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
+	struct microcode_header_intel *mc_header;
 	unsigned int num_saved = mcs->num_saved;
+	enum ucode_state state = UCODE_OK;
+	unsigned int leftover = size;
+	u8 *ucode_ptr = data;
+	unsigned int mc_size;
 	int i;
 
 	while (leftover && num_saved < ARRAY_SIZE(mc_saved_tmp)) {
@@ -321,8 +319,7 @@ get_matching_model_microcode(unsigned long start,
 		 * the platform, we need to find and save microcode patches
 		 * with the same family and model as the BSP.
 		 */
-		if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
-			 UCODE_OK) {
+		if (matching_model_microcode(mc_header, uci->cpu_sig.sig) != UCODE_OK) {
 			ucode_ptr += mc_size;
 			continue;
 		}
@@ -334,19 +331,19 @@ get_matching_model_microcode(unsigned long start,
 
 	if (leftover) {
 		state = UCODE_ERROR;
-		goto out;
+		return state;
 	}
 
 	if (!num_saved) {
 		state = UCODE_NFOUND;
-		goto out;
+		return state;
 	}
 
 	for (i = 0; i < num_saved; i++)
 		mc_ptrs[i] = (unsigned long)mc_saved_tmp[i] - start;
 
 	mcs->num_saved = num_saved;
-out:
+
 	return state;
 }
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/intel: Cleanup get_matching_model_microcode()

[tip-bot for Borislav Petkov]

Commit-ID:  f96fde531946524b26d25d4eed9625695837f524
Gitweb:     http://git.kernel.org/tip/f96fde531946524b26d25d4eed9625695837f524
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:43 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:18 +0100

x86/microcode/intel: Cleanup get_matching_model_microcode()

Reflow arguments, sort local variables in reverse christmas tree, kill
"out" label.

No functionality change.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-16-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/intel.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 0c67fd0..cb397947 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -287,19 +287,17 @@ static unsigned int _save_mc(struct microcode_intel **mc_saved,
  * BSP can stay in the platform.
  */
 static enum ucode_state __init
-get_matching_model_microcode(unsigned long start,
-			     void *data, size_t size,
-			     struct mc_saved_data *mcs,
-			     unsigned long *mc_ptrs,
+get_matching_model_microcode(unsigned long start, void *data, size_t size,
+			     struct mc_saved_data *mcs, unsigned long *mc_ptrs,
 			     struct ucode_cpu_info *uci)
 {
-	u8 *ucode_ptr = data;
-	unsigned int leftover = size;
-	enum ucode_state state = UCODE_OK;
-	unsigned int mc_size;
-	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
+	struct microcode_header_intel *mc_header;
 	unsigned int num_saved = mcs->num_saved;
+	enum ucode_state state = UCODE_OK;
+	unsigned int leftover = size;
+	u8 *ucode_ptr = data;
+	unsigned int mc_size;
 	int i;
 
 	while (leftover && num_saved < ARRAY_SIZE(mc_saved_tmp)) {
@@ -321,8 +319,7 @@ get_matching_model_microcode(unsigned long start,
 		 * the platform, we need to find and save microcode patches
 		 * with the same family and model as the BSP.
 		 */
-		if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
-			 UCODE_OK) {
+		if (matching_model_microcode(mc_header, uci->cpu_sig.sig) != UCODE_OK) {
 			ucode_ptr += mc_size;
 			continue;
 		}
@@ -334,19 +331,19 @@ get_matching_model_microcode(unsigned long start,
 
 	if (leftover) {
 		state = UCODE_ERROR;
-		goto out;
+		return state;
 	}
 
 	if (!num_saved) {
 		state = UCODE_NFOUND;
-		goto out;
+		return state;
 	}
 
 	for (i = 0; i < num_saved; i++)
 		mc_ptrs[i] = (unsigned long)mc_saved_tmp[i] - start;
 
 	mcs->num_saved = num_saved;
-out:
+
 	return state;
 }
 

[PATCH 16/17] x86/microcode/AMD: Issue microcode updated message later

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Before this, we issued this message from save_microcode_in_initrd()
which is called from free_initrd_mem(), i.e., only when we have an
initrd enabled. However, we can update from builtin microcode too but
then we don't issue the update message.

Fix it by issuing that message on the generic driver init path.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/microcode/amd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 9f5ccef33fba..f66cbfe74ce4 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -431,10 +431,6 @@ int __init save_microcode_in_initrd_amd(void)
 	else
 		container = cont_va;
 
-	if (ucode_new_rev)
-		pr_info_once("microcode updated early to new patch_level=0x%08x\n",
-			     ucode_new_rev);
-
 	eax   = cpuid_eax(0x00000001);
 	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
 
@@ -956,6 +952,10 @@ struct microcode_ops * __init init_amd_microcode(void)
 		return NULL;
 	}
 
+	if (ucode_new_rev)
+		pr_info_once("microcode updated early to new patch_level=0x%08x\n",
+			     ucode_new_rev);
+
 	return &microcode_amd_ops;
 }
 
-- 
2.3.5

[tip:x86/microcode] x86/microcode/AMD: Issue microcode updated message later

[tip-bot for Borislav Petkov]

Commit-ID:  f7eb59dda129e46be5e195a46bfd0dde76db9bbd
Gitweb:     http://git.kernel.org/tip/f7eb59dda129e46be5e195a46bfd0dde76db9bbd
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:44 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:18 +0100

x86/microcode/AMD: Issue microcode updated message later

Before this, we issued this message from save_microcode_in_initrd()
which is called from free_initrd_mem(), i.e., only when we have an
initrd enabled. However, we can update from builtin microcode too but
then we don't issue the update message.

Fix it by issuing that message on the generic driver init path.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-17-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/kernel/cpu/microcode/amd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 9f5ccef..f66cbfe 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -431,10 +431,6 @@ int __init save_microcode_in_initrd_amd(void)
 	else
 		container = cont_va;
 
-	if (ucode_new_rev)
-		pr_info_once("microcode updated early to new patch_level=0x%08x\n",
-			     ucode_new_rev);
-
 	eax   = cpuid_eax(0x00000001);
 	eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
 
@@ -956,6 +952,10 @@ struct microcode_ops * __init init_amd_microcode(void)
 		return NULL;
 	}
 
+	if (ucode_new_rev)
+		pr_info_once("microcode updated early to new patch_level=0x%08x\n",
+			     ucode_new_rev);
+
 	return &microcode_amd_ops;
 }
 

[PATCH 17/17] x86/microcode: Document builtin microcode loading method

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Add some text and an example to Documentation/x86/early-microcode.txt
explaining how to build in microcode.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 Documentation/x86/early-microcode.txt | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Documentation/x86/early-microcode.txt b/Documentation/x86/early-microcode.txt
index d62bea6796da..c956d99cf1de 100644
--- a/Documentation/x86/early-microcode.txt
+++ b/Documentation/x86/early-microcode.txt
@@ -40,3 +40,28 @@ cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin (or AuthenticAMD.bin)
 find . | cpio -o -H newc >../ucode.cpio
 cd ..
 cat ucode.cpio /boot/initrd-3.5.0.img >/boot/initrd-3.5.0.ucode.img
+
+Builtin microcode
+=================
+
+We can also load builtin microcode supplied through the regular firmware
+builtin method CONFIG_FIRMWARE_IN_KERNEL. Here's an example:
+
+CONFIG_FIRMWARE_IN_KERNEL=y
+CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
+CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
+
+This basically means, you have the following tree structure locally:
+
+/lib/firmware/
+|-- amd-ucode
+...
+|   |-- microcode_amd_fam15h.bin
+...
+|-- intel-ucode
+...
+|   |-- 06-3a-09
+...
+
+so that the build system can find those files and integrate them into
+the final kernel image. The early loader finds them and applies them.
-- 
2.3.5

[tip:x86/microcode] x86/microcode: Document builtin microcode loading method

[tip-bot for Borislav Petkov]

Commit-ID:  b584303261b7041f209afde4bf7ddb7a21598a1f
Gitweb:     http://git.kernel.org/tip/b584303261b7041f209afde4bf7ddb7a21598a1f
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Wed, 3 Feb 2016 12:33:45 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 9 Feb 2016 11:41:19 +0100

x86/microcode: Document builtin microcode loading method

Add some text and an example to Documentation/x86/early-microcode.txt
explaining how to build in microcode.

Tested-by: Thomas Voegtle <tv@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-18-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 Documentation/x86/early-microcode.txt | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Documentation/x86/early-microcode.txt b/Documentation/x86/early-microcode.txt
index d62bea6..c956d99 100644
--- a/Documentation/x86/early-microcode.txt
+++ b/Documentation/x86/early-microcode.txt
@@ -40,3 +40,28 @@ cp ../microcode.bin kernel/x86/microcode/GenuineIntel.bin (or AuthenticAMD.bin)
 find . | cpio -o -H newc >../ucode.cpio
 cd ..
 cat ucode.cpio /boot/initrd-3.5.0.img >/boot/initrd-3.5.0.ucode.img
+
+Builtin microcode
+=================
+
+We can also load builtin microcode supplied through the regular firmware
+builtin method CONFIG_FIRMWARE_IN_KERNEL. Here's an example:
+
+CONFIG_FIRMWARE_IN_KERNEL=y
+CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
+CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
+
+This basically means, you have the following tree structure locally:
+
+/lib/firmware/
+|-- amd-ucode
+...
+|   |-- microcode_amd_fam15h.bin
+...
+|-- intel-ucode
+...
+|   |-- 06-3a-09
+...
+
+so that the build system can find those files and integrate them into
+the final kernel image. The early loader finds them and applies them.