* [PATCH 0/3] MSR cleanups, v2
@ 2014-03-09 17:05 Borislav Petkov
2014-03-09 17:05 ` [PATCH 1/3] x86: Add another set of MSR accessor functions Borislav Petkov
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Borislav Petkov @ 2014-03-09 17:05 UTC (permalink / raw)
To: X86 ML; +Cc: LKML, Borislav Petkov
From: Borislav Petkov <bp@suse.de>
Here's v2, all feedback from last time should be addressed. Patches boot
fine on an Intel and AMD box.
I've also got them in a nice pullable form, if that is preferred:
--
The following changes since commit b01d4e68933ec23e43b1046fa35d593cefcf37d1:
x86: fix compile error due to X86_TRAP_NMI use in asm files (2014-03-07 18:58:40 -0800)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git tags/msrs
for you to fetch changes up to b685c3e2f627f7c800aa4a34bd6f8438eaed8b3b:
x86, Intel: Convert to the new MSR accessors (2014-03-09 12:06:50 +0100)
----------------------------------------------------------------
Aggregation of MSR toggling bits functionality into common functions.
----------------------------------------------------------------
Borislav Petkov (3):
x86: Add another set of MSR accessor functions
x86, AMD: Convert to the new MSR accessors
x86, Intel: Convert to the new MSR accessors
arch/x86/include/asm/msr.h | 2 +
arch/x86/include/uapi/asm/msr-index.h | 9 ++--
arch/x86/kernel/cpu/amd.c | 48 +++++--------------
arch/x86/kernel/cpu/intel.c | 30 +++---------
arch/x86/lib/msr.c | 89 ++++++++++++++++++++++++++++++++++-
5 files changed, 115 insertions(+), 63 deletions(-)
Changelog:
---------
v1:
Hi guys,
this is just a preview of what I think we talked about. I'm sending it
out now to gather some feedback before I go and test it more thoroughly
(it boots in a guest though :)).
Thanks.
--
1.9.0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH 1/3] x86: Add another set of MSR accessor functions
2014-03-09 17:05 [PATCH 0/3] MSR cleanups, v2 Borislav Petkov
@ 2014-03-09 17:05 ` Borislav Petkov
2014-03-13 23:18 ` [tip:x86/cpu] " tip-bot for Borislav Petkov
2014-03-09 17:05 ` [PATCH 2/3] x86, AMD: Convert to the new MSR accessors Borislav Petkov
2014-03-09 17:05 ` [PATCH 3/3] x86, Intel: Convert to the new " Borislav Petkov
2 siblings, 1 reply; 7+ messages in thread
From: Borislav Petkov @ 2014-03-09 17:05 UTC (permalink / raw)
To: X86 ML; +Cc: LKML, Borislav Petkov
From: Borislav Petkov <bp@suse.de>
We very often need to set or clear a bit in an MSR as a result of doing
some sort of a hardware configuration. Add generic versions of that
repeated functionality in order to save us a bunch of duplicated code in
the early CPU vendor detection/config code.
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/include/asm/msr.h | 2 ++
arch/x86/lib/msr.c | 89 +++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 90 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index e139b13f2a33..de36f22eb0b9 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -214,6 +214,8 @@ do { \
struct msr *msrs_alloc(void);
void msrs_free(struct msr *msrs);
+int msr_set_bit(u32 msr, u8 bit);
+int msr_clear_bit(u32 msr, u8 bit);
#ifdef CONFIG_SMP
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
index 8f8eebdca7d4..db9db446b71a 100644
--- a/arch/x86/lib/msr.c
+++ b/arch/x86/lib/msr.c
@@ -8,7 +8,7 @@ struct msr *msrs_alloc(void)
msrs = alloc_percpu(struct msr);
if (!msrs) {
- pr_warning("%s: error allocating msrs\n", __func__);
+ pr_warn("%s: error allocating msrs\n", __func__);
return NULL;
}
@@ -21,3 +21,90 @@ void msrs_free(struct msr *msrs)
free_percpu(msrs);
}
EXPORT_SYMBOL(msrs_free);
+
+/**
+ * Read an MSR with error handling
+ *
+ * @msr: MSR to read
+ * @m: value to read into
+ *
+ * It returns read data only on success, otherwise it doesn't change the output
+ * argument @m.
+ *
+ */
+int msr_read(u32 msr, struct msr *m)
+{
+ int err;
+ u64 val;
+
+ err = rdmsrl_safe(msr, &val);
+ if (!err)
+ m->q = val;
+
+ return err;
+}
+
+/**
+ * Write an MSR with error handling
+ *
+ * @msr: MSR to write
+ * @m: value to write
+ */
+int msr_write(u32 msr, struct msr *m)
+{
+ return wrmsrl_safe(msr, m->q);
+}
+
+static inline int __flip_bit(u32 msr, u8 bit, bool set)
+{
+ struct msr m, m1;
+ int err = -EINVAL;
+
+ if (bit > 63)
+ return err;
+
+ err = msr_read(msr, &m);
+ if (err)
+ return err;
+
+ m1 = m;
+ if (set)
+ m1.q |= BIT_64(bit);
+ else
+ m1.q &= ~BIT_64(bit);
+
+ if (m1.q == m.q)
+ return 0;
+
+ err = msr_write(msr, &m);
+ if (err)
+ return err;
+
+ return 1;
+}
+
+/**
+ * Set @bit in a MSR @msr.
+ *
+ * Retval:
+ * < 0: An error was encountered.
+ * = 0: Bit was already set.
+ * > 0: Hardware accepted the MSR write.
+ */
+int msr_set_bit(u32 msr, u8 bit)
+{
+ return __flip_bit(msr, bit, true);
+}
+
+/**
+ * Clear @bit in a MSR @msr.
+ *
+ * Retval:
+ * < 0: An error was encountered.
+ * = 0: Bit was already cleared.
+ * > 0: Hardware accepted the MSR write.
+ */
+int msr_clear_bit(u32 msr, u8 bit)
+{
+ return __flip_bit(msr, bit, false);
+}
--
1.9.0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH 2/3] x86, AMD: Convert to the new MSR accessors
2014-03-09 17:05 [PATCH 0/3] MSR cleanups, v2 Borislav Petkov
2014-03-09 17:05 ` [PATCH 1/3] x86: Add another set of MSR accessor functions Borislav Petkov
@ 2014-03-09 17:05 ` Borislav Petkov
2014-03-13 23:18 ` [tip:x86/cpu] x86, AMD: Convert to the new bit access " tip-bot for Borislav Petkov
2014-03-09 17:05 ` [PATCH 3/3] x86, Intel: Convert to the new " Borislav Petkov
2 siblings, 1 reply; 7+ messages in thread
From: Borislav Petkov @ 2014-03-09 17:05 UTC (permalink / raw)
To: X86 ML; +Cc: LKML, Borislav Petkov
From: Borislav Petkov <bp@suse.de>
... and save us a bunch of code.
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/kernel/cpu/amd.c | 48 ++++++++++++-----------------------------------
1 file changed, 12 insertions(+), 36 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c67ffa686064..b85e43a5a462 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -233,9 +233,7 @@ static void init_amd_k7(struct cpuinfo_x86 *c)
if (c->x86_model >= 6 && c->x86_model <= 10) {
if (!cpu_has(c, X86_FEATURE_XMM)) {
printk(KERN_INFO "Enabling disabled K7/SSE Support.\n");
- rdmsr(MSR_K7_HWCR, l, h);
- l &= ~0x00008000;
- wrmsr(MSR_K7_HWCR, l, h);
+ msr_clear_bit(MSR_K7_HWCR, 15);
set_cpu_cap(c, X86_FEATURE_XMM);
}
}
@@ -509,14 +507,8 @@ static void early_init_amd(struct cpuinfo_x86 *c)
#endif
/* F16h erratum 793, CVE-2013-6885 */
- if (c->x86 == 0x16 && c->x86_model <= 0xf) {
- u64 val;
-
- rdmsrl(MSR_AMD64_LS_CFG, val);
- if (!(val & BIT(15)))
- wrmsrl(MSR_AMD64_LS_CFG, val | BIT(15));
- }
-
+ if (c->x86 == 0x16 && c->x86_model <= 0xf)
+ msr_set_bit(MSR_AMD64_LS_CFG, 15);
}
static const int amd_erratum_383[];
@@ -536,11 +528,8 @@ static void init_amd(struct cpuinfo_x86 *c)
* Errata 63 for SH-B3 steppings
* Errata 122 for all steppings (F+ have it disabled by default)
*/
- if (c->x86 == 0xf) {
- rdmsrl(MSR_K7_HWCR, value);
- value |= 1 << 6;
- wrmsrl(MSR_K7_HWCR, value);
- }
+ if (c->x86 == 0xf)
+ msr_set_bit(MSR_K7_HWCR, 6);
#endif
early_init_amd(c);
@@ -623,14 +612,11 @@ static void init_amd(struct cpuinfo_x86 *c)
(c->x86_model >= 0x10) && (c->x86_model <= 0x1f) &&
!cpu_has(c, X86_FEATURE_TOPOEXT)) {
- if (!rdmsrl_safe(0xc0011005, &value)) {
- value |= 1ULL << 54;
- wrmsrl_safe(0xc0011005, value);
+ if (msr_set_bit(0xc0011005, 54) > 0) {
rdmsrl(0xc0011005, value);
- if (value & (1ULL << 54)) {
+ if (value & BIT_64(54)) {
set_cpu_cap(c, X86_FEATURE_TOPOEXT);
- printk(KERN_INFO FW_INFO "CPU: Re-enabling "
- "disabled Topology Extensions Support\n");
+ pr_info(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
}
}
}
@@ -709,19 +695,12 @@ static void init_amd(struct cpuinfo_x86 *c)
* Disable GART TLB Walk Errors on Fam10h. We do this here
* because this is always needed when GART is enabled, even in a
* kernel which has no MCE support built in.
- * BIOS should disable GartTlbWlk Errors themself. If
- * it doesn't do it here as suggested by the BKDG.
+ * BIOS should disable GartTlbWlk Errors already. If
+ * it doesn't, do it here as suggested by the BKDG.
*
* Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
*/
- u64 mask;
- int err;
-
- err = rdmsrl_safe(MSR_AMD64_MCx_MASK(4), &mask);
- if (err == 0) {
- mask |= (1 << 10);
- wrmsrl_safe(MSR_AMD64_MCx_MASK(4), mask);
- }
+ msr_set_bit(MSR_AMD64_MCx_MASK(4), 10);
/*
* On family 10h BIOS may not have properly enabled WC+ support,
@@ -733,10 +712,7 @@ static void init_amd(struct cpuinfo_x86 *c)
* NOTE: we want to use the _safe accessors so as not to #GP kvm
* guests on older kvm hosts.
*/
-
- rdmsrl_safe(MSR_AMD64_BU_CFG2, &value);
- value &= ~(1ULL << 24);
- wrmsrl_safe(MSR_AMD64_BU_CFG2, value);
+ msr_clear_bit(MSR_AMD64_BU_CFG2, 24);
if (cpu_has_amd_erratum(c, amd_erratum_383))
set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
--
1.9.0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [PATCH 3/3] x86, Intel: Convert to the new MSR accessors
2014-03-09 17:05 [PATCH 0/3] MSR cleanups, v2 Borislav Petkov
2014-03-09 17:05 ` [PATCH 1/3] x86: Add another set of MSR accessor functions Borislav Petkov
2014-03-09 17:05 ` [PATCH 2/3] x86, AMD: Convert to the new MSR accessors Borislav Petkov
@ 2014-03-09 17:05 ` Borislav Petkov
2014-03-13 23:18 ` [tip:x86/cpu] x86, Intel: Convert to the new bit access " tip-bot for Borislav Petkov
2 siblings, 1 reply; 7+ messages in thread
From: Borislav Petkov @ 2014-03-09 17:05 UTC (permalink / raw)
To: X86 ML; +Cc: LKML, Borislav Petkov
From: Borislav Petkov <bp@suse.de>
... and save some lines of code.
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/include/uapi/asm/msr-index.h | 9 ++++++---
arch/x86/kernel/cpu/intel.c | 30 +++++++-----------------------
2 files changed, 13 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index c19fc60ff062..045e6db6f58a 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -368,14 +368,16 @@
#define THERM_LOG_THRESHOLD1 (1 << 9)
/* MISC_ENABLE bits: architectural */
-#define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << 0)
+#define MSR_BIT_FAST_STRING 0
+#define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << MSR_BIT_FAST_STRING)
#define MSR_IA32_MISC_ENABLE_TCC (1ULL << 1)
#define MSR_IA32_MISC_ENABLE_EMON (1ULL << 7)
#define MSR_IA32_MISC_ENABLE_BTS_UNAVAIL (1ULL << 11)
#define MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL (1ULL << 12)
#define MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP (1ULL << 16)
#define MSR_IA32_MISC_ENABLE_MWAIT (1ULL << 18)
-#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID (1ULL << 22)
+#define MSR_BIT_LIMIT_CPUID 22
+#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID (1ULL << MSR_BIT_LIMIT_CPUID);
#define MSR_IA32_MISC_ENABLE_XTPR_DISABLE (1ULL << 23)
#define MSR_IA32_MISC_ENABLE_XD_DISABLE (1ULL << 34)
@@ -385,7 +387,8 @@
#define MSR_IA32_MISC_ENABLE_SPLIT_LOCK_DISABLE (1ULL << 4)
#define MSR_IA32_MISC_ENABLE_L3CACHE_DISABLE (1ULL << 6)
#define MSR_IA32_MISC_ENABLE_SUPPRESS_LOCK (1ULL << 8)
-#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE (1ULL << 9)
+#define MSR_BIT_PRF_DIS 9
+#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE (1ULL << MSR_BIT_PRF_DIS)
#define MSR_IA32_MISC_ENABLE_FERR (1ULL << 10)
#define MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX (1ULL << 10)
#define MSR_IA32_MISC_ENABLE_TM2 (1ULL << 13)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5cd9bfabd645..44ca6317af43 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -31,11 +31,7 @@ static void early_init_intel(struct cpuinfo_x86 *c)
/* Unmask CPUID levels if masked: */
if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
- rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-
- if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
- misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
- wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+ if (msr_clear_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_LIMIT_CPUID) > 0) {
c->cpuid_level = cpuid_eax(0);
get_cpu_cap(c);
}
@@ -129,16 +125,9 @@ static void early_init_intel(struct cpuinfo_x86 *c)
* Ingo Molnar reported a Pentium D (model 6) and a Xeon
* (model 2) with the same problem.
*/
- if (c->x86 == 15) {
- rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-
- if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
- printk(KERN_INFO "kmemcheck: Disabling fast string operations\n");
-
- misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
- wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
- }
- }
+ if (c->x86 == 15)
+ if (msr_clear_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_FAST_STRING) > 0)
+ pr_info("kmemcheck: Disabling fast string operations\n");
#endif
/*
@@ -197,8 +186,6 @@ static void intel_smp_check(struct cpuinfo_x86 *c)
static void intel_workarounds(struct cpuinfo_x86 *c)
{
- unsigned long lo, hi;
-
#ifdef CONFIG_X86_F00F_BUG
/*
* All current models of Pentium and Pentium with MMX technology CPUs
@@ -229,12 +216,9 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
* Hardware prefetcher may cause stale data to be loaded into the cache.
*/
if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
- rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
- if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
- printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
- printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
- lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
- wrmsr(MSR_IA32_MISC_ENABLE, lo, hi);
+ if (msr_set_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_PRF_DIS) > 0) {
+ pr_info("CPU: C0 stepping P4 Xeon detected.\n");
+ pr_info("CPU: Disabling hardware prefetching (Errata 037)\n");
}
}
--
1.9.0
^ permalink raw reply [flat|nested] 7+ messages in thread
* [tip:x86/cpu] x86: Add another set of MSR accessor functions
2014-03-09 17:05 ` [PATCH 1/3] x86: Add another set of MSR accessor functions Borislav Petkov
@ 2014-03-13 23:18 ` tip-bot for Borislav Petkov
0 siblings, 0 replies; 7+ messages in thread
From: tip-bot for Borislav Petkov @ 2014-03-13 23:18 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, tglx, hpa, bp
Commit-ID: 22085a66c2fab6cf9b9393c056a3600a6b4735de
Gitweb: http://git.kernel.org/tip/22085a66c2fab6cf9b9393c056a3600a6b4735de
Author: Borislav Petkov <bp@suse.de>
AuthorDate: Sun, 9 Mar 2014 18:05:23 +0100
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Thu, 13 Mar 2014 15:34:45 -0700
x86: Add another set of MSR accessor functions
We very often need to set or clear a bit in an MSR as a result of doing
some sort of a hardware configuration. Add generic versions of that
repeated functionality in order to save us a bunch of duplicated code in
the early CPU vendor detection/config code.
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1394384725-10796-2-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/include/asm/msr.h | 2 ++
arch/x86/lib/msr.c | 89 +++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 90 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index e139b13..de36f22 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -214,6 +214,8 @@ do { \
struct msr *msrs_alloc(void);
void msrs_free(struct msr *msrs);
+int msr_set_bit(u32 msr, u8 bit);
+int msr_clear_bit(u32 msr, u8 bit);
#ifdef CONFIG_SMP
int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
diff --git a/arch/x86/lib/msr.c b/arch/x86/lib/msr.c
index 8f8eebd..db9db44 100644
--- a/arch/x86/lib/msr.c
+++ b/arch/x86/lib/msr.c
@@ -8,7 +8,7 @@ struct msr *msrs_alloc(void)
msrs = alloc_percpu(struct msr);
if (!msrs) {
- pr_warning("%s: error allocating msrs\n", __func__);
+ pr_warn("%s: error allocating msrs\n", __func__);
return NULL;
}
@@ -21,3 +21,90 @@ void msrs_free(struct msr *msrs)
free_percpu(msrs);
}
EXPORT_SYMBOL(msrs_free);
+
+/**
+ * Read an MSR with error handling
+ *
+ * @msr: MSR to read
+ * @m: value to read into
+ *
+ * It returns read data only on success, otherwise it doesn't change the output
+ * argument @m.
+ *
+ */
+int msr_read(u32 msr, struct msr *m)
+{
+ int err;
+ u64 val;
+
+ err = rdmsrl_safe(msr, &val);
+ if (!err)
+ m->q = val;
+
+ return err;
+}
+
+/**
+ * Write an MSR with error handling
+ *
+ * @msr: MSR to write
+ * @m: value to write
+ */
+int msr_write(u32 msr, struct msr *m)
+{
+ return wrmsrl_safe(msr, m->q);
+}
+
+static inline int __flip_bit(u32 msr, u8 bit, bool set)
+{
+ struct msr m, m1;
+ int err = -EINVAL;
+
+ if (bit > 63)
+ return err;
+
+ err = msr_read(msr, &m);
+ if (err)
+ return err;
+
+ m1 = m;
+ if (set)
+ m1.q |= BIT_64(bit);
+ else
+ m1.q &= ~BIT_64(bit);
+
+ if (m1.q == m.q)
+ return 0;
+
+ err = msr_write(msr, &m);
+ if (err)
+ return err;
+
+ return 1;
+}
+
+/**
+ * Set @bit in a MSR @msr.
+ *
+ * Retval:
+ * < 0: An error was encountered.
+ * = 0: Bit was already set.
+ * > 0: Hardware accepted the MSR write.
+ */
+int msr_set_bit(u32 msr, u8 bit)
+{
+ return __flip_bit(msr, bit, true);
+}
+
+/**
+ * Clear @bit in a MSR @msr.
+ *
+ * Retval:
+ * < 0: An error was encountered.
+ * = 0: Bit was already cleared.
+ * > 0: Hardware accepted the MSR write.
+ */
+int msr_clear_bit(u32 msr, u8 bit)
+{
+ return __flip_bit(msr, bit, false);
+}
^ permalink raw reply [flat|nested] 7+ messages in thread
* [tip:x86/cpu] x86, AMD: Convert to the new bit access MSR accessors
2014-03-09 17:05 ` [PATCH 2/3] x86, AMD: Convert to the new MSR accessors Borislav Petkov
@ 2014-03-13 23:18 ` tip-bot for Borislav Petkov
0 siblings, 0 replies; 7+ messages in thread
From: tip-bot for Borislav Petkov @ 2014-03-13 23:18 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, tglx, hpa, bp
Commit-ID: 8f86a7373a1c8ee52d3cc64adf7f2ace13fd24ed
Gitweb: http://git.kernel.org/tip/8f86a7373a1c8ee52d3cc64adf7f2ace13fd24ed
Author: Borislav Petkov <bp@suse.de>
AuthorDate: Sun, 9 Mar 2014 18:05:24 +0100
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Thu, 13 Mar 2014 15:35:03 -0700
x86, AMD: Convert to the new bit access MSR accessors
... and save us a bunch of code.
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1394384725-10796-3-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/kernel/cpu/amd.c | 48 ++++++++++++-----------------------------------
1 file changed, 12 insertions(+), 36 deletions(-)
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c67ffa6..b85e43a 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -233,9 +233,7 @@ static void init_amd_k7(struct cpuinfo_x86 *c)
if (c->x86_model >= 6 && c->x86_model <= 10) {
if (!cpu_has(c, X86_FEATURE_XMM)) {
printk(KERN_INFO "Enabling disabled K7/SSE Support.\n");
- rdmsr(MSR_K7_HWCR, l, h);
- l &= ~0x00008000;
- wrmsr(MSR_K7_HWCR, l, h);
+ msr_clear_bit(MSR_K7_HWCR, 15);
set_cpu_cap(c, X86_FEATURE_XMM);
}
}
@@ -509,14 +507,8 @@ static void early_init_amd(struct cpuinfo_x86 *c)
#endif
/* F16h erratum 793, CVE-2013-6885 */
- if (c->x86 == 0x16 && c->x86_model <= 0xf) {
- u64 val;
-
- rdmsrl(MSR_AMD64_LS_CFG, val);
- if (!(val & BIT(15)))
- wrmsrl(MSR_AMD64_LS_CFG, val | BIT(15));
- }
-
+ if (c->x86 == 0x16 && c->x86_model <= 0xf)
+ msr_set_bit(MSR_AMD64_LS_CFG, 15);
}
static const int amd_erratum_383[];
@@ -536,11 +528,8 @@ static void init_amd(struct cpuinfo_x86 *c)
* Errata 63 for SH-B3 steppings
* Errata 122 for all steppings (F+ have it disabled by default)
*/
- if (c->x86 == 0xf) {
- rdmsrl(MSR_K7_HWCR, value);
- value |= 1 << 6;
- wrmsrl(MSR_K7_HWCR, value);
- }
+ if (c->x86 == 0xf)
+ msr_set_bit(MSR_K7_HWCR, 6);
#endif
early_init_amd(c);
@@ -623,14 +612,11 @@ static void init_amd(struct cpuinfo_x86 *c)
(c->x86_model >= 0x10) && (c->x86_model <= 0x1f) &&
!cpu_has(c, X86_FEATURE_TOPOEXT)) {
- if (!rdmsrl_safe(0xc0011005, &value)) {
- value |= 1ULL << 54;
- wrmsrl_safe(0xc0011005, value);
+ if (msr_set_bit(0xc0011005, 54) > 0) {
rdmsrl(0xc0011005, value);
- if (value & (1ULL << 54)) {
+ if (value & BIT_64(54)) {
set_cpu_cap(c, X86_FEATURE_TOPOEXT);
- printk(KERN_INFO FW_INFO "CPU: Re-enabling "
- "disabled Topology Extensions Support\n");
+ pr_info(FW_INFO "CPU: Re-enabling disabled Topology Extensions Support.\n");
}
}
}
@@ -709,19 +695,12 @@ static void init_amd(struct cpuinfo_x86 *c)
* Disable GART TLB Walk Errors on Fam10h. We do this here
* because this is always needed when GART is enabled, even in a
* kernel which has no MCE support built in.
- * BIOS should disable GartTlbWlk Errors themself. If
- * it doesn't do it here as suggested by the BKDG.
+ * BIOS should disable GartTlbWlk Errors already. If
+ * it doesn't, do it here as suggested by the BKDG.
*
* Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=33012
*/
- u64 mask;
- int err;
-
- err = rdmsrl_safe(MSR_AMD64_MCx_MASK(4), &mask);
- if (err == 0) {
- mask |= (1 << 10);
- wrmsrl_safe(MSR_AMD64_MCx_MASK(4), mask);
- }
+ msr_set_bit(MSR_AMD64_MCx_MASK(4), 10);
/*
* On family 10h BIOS may not have properly enabled WC+ support,
@@ -733,10 +712,7 @@ static void init_amd(struct cpuinfo_x86 *c)
* NOTE: we want to use the _safe accessors so as not to #GP kvm
* guests on older kvm hosts.
*/
-
- rdmsrl_safe(MSR_AMD64_BU_CFG2, &value);
- value &= ~(1ULL << 24);
- wrmsrl_safe(MSR_AMD64_BU_CFG2, value);
+ msr_clear_bit(MSR_AMD64_BU_CFG2, 24);
if (cpu_has_amd_erratum(c, amd_erratum_383))
set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
^ permalink raw reply [flat|nested] 7+ messages in thread
* [tip:x86/cpu] x86, Intel: Convert to the new bit access MSR accessors
2014-03-09 17:05 ` [PATCH 3/3] x86, Intel: Convert to the new " Borislav Petkov
@ 2014-03-13 23:18 ` tip-bot for Borislav Petkov
0 siblings, 0 replies; 7+ messages in thread
From: tip-bot for Borislav Petkov @ 2014-03-13 23:18 UTC (permalink / raw)
To: linux-tip-commits; +Cc: linux-kernel, hpa, mingo, tglx, hpa, bp
Commit-ID: c0a639ad0bc6b178b46996bd1f821a04643e2bde
Gitweb: http://git.kernel.org/tip/c0a639ad0bc6b178b46996bd1f821a04643e2bde
Author: Borislav Petkov <bp@suse.de>
AuthorDate: Sun, 9 Mar 2014 18:05:25 +0100
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Thu, 13 Mar 2014 15:35:09 -0700
x86, Intel: Convert to the new bit access MSR accessors
... and save some lines of code.
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1394384725-10796-4-git-send-email-bp@alien8.de
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/include/uapi/asm/msr-index.h | 9 ++++++---
arch/x86/kernel/cpu/intel.c | 30 +++++++-----------------------
2 files changed, 13 insertions(+), 26 deletions(-)
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index c19fc60..045e6db 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -368,14 +368,16 @@
#define THERM_LOG_THRESHOLD1 (1 << 9)
/* MISC_ENABLE bits: architectural */
-#define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << 0)
+#define MSR_BIT_FAST_STRING 0
+#define MSR_IA32_MISC_ENABLE_FAST_STRING (1ULL << MSR_BIT_FAST_STRING)
#define MSR_IA32_MISC_ENABLE_TCC (1ULL << 1)
#define MSR_IA32_MISC_ENABLE_EMON (1ULL << 7)
#define MSR_IA32_MISC_ENABLE_BTS_UNAVAIL (1ULL << 11)
#define MSR_IA32_MISC_ENABLE_PEBS_UNAVAIL (1ULL << 12)
#define MSR_IA32_MISC_ENABLE_ENHANCED_SPEEDSTEP (1ULL << 16)
#define MSR_IA32_MISC_ENABLE_MWAIT (1ULL << 18)
-#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID (1ULL << 22)
+#define MSR_BIT_LIMIT_CPUID 22
+#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID (1ULL << MSR_BIT_LIMIT_CPUID);
#define MSR_IA32_MISC_ENABLE_XTPR_DISABLE (1ULL << 23)
#define MSR_IA32_MISC_ENABLE_XD_DISABLE (1ULL << 34)
@@ -385,7 +387,8 @@
#define MSR_IA32_MISC_ENABLE_SPLIT_LOCK_DISABLE (1ULL << 4)
#define MSR_IA32_MISC_ENABLE_L3CACHE_DISABLE (1ULL << 6)
#define MSR_IA32_MISC_ENABLE_SUPPRESS_LOCK (1ULL << 8)
-#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE (1ULL << 9)
+#define MSR_BIT_PRF_DIS 9
+#define MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE (1ULL << MSR_BIT_PRF_DIS)
#define MSR_IA32_MISC_ENABLE_FERR (1ULL << 10)
#define MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX (1ULL << 10)
#define MSR_IA32_MISC_ENABLE_TM2 (1ULL << 13)
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5cd9bfa..44ca631 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -31,11 +31,7 @@ static void early_init_intel(struct cpuinfo_x86 *c)
/* Unmask CPUID levels if masked: */
if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
- rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-
- if (misc_enable & MSR_IA32_MISC_ENABLE_LIMIT_CPUID) {
- misc_enable &= ~MSR_IA32_MISC_ENABLE_LIMIT_CPUID;
- wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+ if (msr_clear_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_LIMIT_CPUID) > 0) {
c->cpuid_level = cpuid_eax(0);
get_cpu_cap(c);
}
@@ -129,16 +125,9 @@ static void early_init_intel(struct cpuinfo_x86 *c)
* Ingo Molnar reported a Pentium D (model 6) and a Xeon
* (model 2) with the same problem.
*/
- if (c->x86 == 15) {
- rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
-
- if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
- printk(KERN_INFO "kmemcheck: Disabling fast string operations\n");
-
- misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
- wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
- }
- }
+ if (c->x86 == 15)
+ if (msr_clear_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_FAST_STRING) > 0)
+ pr_info("kmemcheck: Disabling fast string operations\n");
#endif
/*
@@ -197,8 +186,6 @@ static void intel_smp_check(struct cpuinfo_x86 *c)
static void intel_workarounds(struct cpuinfo_x86 *c)
{
- unsigned long lo, hi;
-
#ifdef CONFIG_X86_F00F_BUG
/*
* All current models of Pentium and Pentium with MMX technology CPUs
@@ -229,12 +216,9 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
* Hardware prefetcher may cause stale data to be loaded into the cache.
*/
if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
- rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
- if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
- printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
- printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
- lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
- wrmsr(MSR_IA32_MISC_ENABLE, lo, hi);
+ if (msr_set_bit(MSR_IA32_MISC_ENABLE, MSR_BIT_PRF_DIS) > 0) {
+ pr_info("CPU: C0 stepping P4 Xeon detected.\n");
+ pr_info("CPU: Disabling hardware prefetching (Errata 037)\n");
}
}
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-03-13 23:19 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-03-09 17:05 [PATCH 0/3] MSR cleanups, v2 Borislav Petkov
2014-03-09 17:05 ` [PATCH 1/3] x86: Add another set of MSR accessor functions Borislav Petkov
2014-03-13 23:18 ` [tip:x86/cpu] " tip-bot for Borislav Petkov
2014-03-09 17:05 ` [PATCH 2/3] x86, AMD: Convert to the new MSR accessors Borislav Petkov
2014-03-13 23:18 ` [tip:x86/cpu] x86, AMD: Convert to the new bit access " tip-bot for Borislav Petkov
2014-03-09 17:05 ` [PATCH 3/3] x86, Intel: Convert to the new " Borislav Petkov
2014-03-13 23:18 ` [tip:x86/cpu] x86, Intel: Convert to the new bit access " tip-bot for Borislav Petkov
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