[PATCH] x86, CPU: Convert more features to bugs

From: Borislav Petkov
Date: Mon May 26 2014 - 15:54:57 EST

From: Borislav Petkov <bp@xxxxxxx>

X86_FEATURE_FXSAVE_LEAK, X86_FEATURE_11AP and
X86_FEATURE_CLFLUSH_MONITOR are not really features but synthetic bits
we use for applying different bug workarounds. Call them what they
really are.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/include/asm/apic.h | 2 +-
arch/x86/include/asm/cpufeature.h | 9 ++++++---
arch/x86/include/asm/fpu-internal.h | 2 +-
arch/x86/include/asm/mwait.h | 2 +-
arch/x86/kernel/cpu/amd.c | 2 +-
arch/x86/kernel/cpu/intel.c | 4 ++--
6 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 19b0ebafcd3e..79752f2bdec5 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -99,7 +99,7 @@ static inline void native_apic_mem_write(u32 reg, u32 v)
{
volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);

- alternative_io("movl %0, %1", "xchgl %0, %1", X86_FEATURE_11AP,
+ alternative_io("movl %0, %1", "xchgl %0, %1", X86_BUG_11AP,
ASM_OUTPUT2("=r" (v), "=m" (*addr)),
ASM_OUTPUT2("0" (v), "m" (*addr)));
}
diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index e265ff95d16d..5a0578fbd458 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -81,7 +81,7 @@
#define X86_FEATURE_P4 (3*32+ 7) /* "" P4 */
#define X86_FEATURE_CONSTANT_TSC (3*32+ 8) /* TSC ticks at a constant rate */
#define X86_FEATURE_UP (3*32+ 9) /* smp kernel running on up */
-#define X86_FEATURE_FXSAVE_LEAK (3*32+10) /* "" FXSAVE leaks FOP/FIP/FOP */
+/* free, was #define X86_FEATURE_FXSAVE_LEAK (3*32+10) "" FXSAVE leaks FOP/FIP/FOP */
#define X86_FEATURE_ARCH_PERFMON (3*32+11) /* Intel Architectural PerfMon */
#define X86_FEATURE_PEBS (3*32+12) /* Precise-Event Based Sampling */
#define X86_FEATURE_BTS (3*32+13) /* Branch Trace Store */
@@ -90,13 +90,13 @@
#define X86_FEATURE_REP_GOOD (3*32+16) /* rep microcode works well */
#define X86_FEATURE_MFENCE_RDTSC (3*32+17) /* "" Mfence synchronizes RDTSC */
#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* "" Lfence synchronizes RDTSC */
-#define X86_FEATURE_11AP (3*32+19) /* "" Bad local APIC aka 11AP */
+/* free, was: #define X86_FEATURE_11AP (3*32+19) "" Bad local APIC aka 11AP */
#define X86_FEATURE_NOPL (3*32+20) /* The NOPL (0F 1F) instructions */
#define X86_FEATURE_ALWAYS (3*32+21) /* "" Always-present feature */
#define X86_FEATURE_XTOPOLOGY (3*32+22) /* cpu topology enum extensions */
#define X86_FEATURE_TSC_RELIABLE (3*32+23) /* TSC is known to be reliable */
#define X86_FEATURE_NONSTOP_TSC (3*32+24) /* TSC does not stop in C states */
-#define X86_FEATURE_CLFLUSH_MONITOR (3*32+25) /* "" clflush reqd with monitor */
+/* free, was #define X86_FEATURE_CLFLUSH_MONITOR (3*32+25) "" clflush reqd with monitor */
#define X86_FEATURE_EXTD_APICID (3*32+26) /* has extended APICID (8 bits) */
#define X86_FEATURE_AMD_DCM (3*32+27) /* multi-node processor */
#define X86_FEATURE_APERFMPERF (3*32+28) /* APERFMPERF */
@@ -236,6 +236,9 @@
#define X86_BUG_COMA X86_BUG(2) /* Cyrix 6x86 coma */
#define X86_BUG_AMD_TLB_MMATCH X86_BUG(3) /* AMD Erratum 383 */
#define X86_BUG_AMD_APIC_C1E X86_BUG(4) /* AMD Erratum 400 */
+#define X86_BUG_11AP X86_BUG(5) /* Bad local APIC aka 11AP */
+#define X86_BUG_FXSAVE_LEAK X86_BUG(6) /* FXSAVE leaks FOP/FIP/FOP */
+#define X86_BUG_CLFLUSH_MONITOR X86_BUG(7) /* AAI65, CLFLUSH required before MONITOR */

#if defined(__KERNEL__) && !defined(__ASSEMBLY__)

diff --git a/arch/x86/include/asm/fpu-internal.h b/arch/x86/include/asm/fpu-internal.h
index 115e3689cd53..60171447d10c 100644
--- a/arch/x86/include/asm/fpu-internal.h
+++ b/arch/x86/include/asm/fpu-internal.h
@@ -293,7 +293,7 @@ static inline int restore_fpu_checking(struct task_struct *tsk)
/* AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception
is pending. Clear the x87 state here by setting it to fixed
values. "m" is a random variable that should be in L1 */
- if (unlikely(static_cpu_has_safe(X86_FEATURE_FXSAVE_LEAK))) {
+ if (unlikely(static_cpu_has_safe(X86_BUG_FXSAVE_LEAK))) {
asm volatile(
"fnclex\n\t"
"emms\n\t"
diff --git a/arch/x86/include/asm/mwait.h b/arch/x86/include/asm/mwait.h
index 1da25a5f96f9..097523107474 100644
--- a/arch/x86/include/asm/mwait.h
+++ b/arch/x86/include/asm/mwait.h
@@ -43,7 +43,7 @@ static inline void __mwait(unsigned long eax, unsigned long ecx)
static inline void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
{
if (!current_set_polling_and_test()) {
- if (static_cpu_has(X86_FEATURE_CLFLUSH_MONITOR)) {
+ if (static_cpu_has(X86_BUG_CLFLUSH_MONITOR)) {
mb();
clflush((void *)&current_thread_info()->flags);
mb();
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index ce8b8ff0e0ef..f279ce665438 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -595,7 +595,7 @@ static void init_amd(struct cpuinfo_x86 *c)

/* Enable workaround for FXSAVE leak */
if (c->x86 >= 6)
- set_cpu_cap(c, X86_FEATURE_FXSAVE_LEAK);
+ set_cpu_cap(c, X86_BUG_FXSAVE_LEAK);

if (!c->x86_model_id[0]) {
switch (c->x86) {
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index a80029035bf2..59803ad0efa9 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -253,7 +253,7 @@ static void intel_workarounds(struct cpuinfo_x86 *c)
*/
if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
(c->x86_mask < 0x6 || c->x86_mask == 0xb))
- set_cpu_cap(c, X86_FEATURE_11AP);
+ set_cpu_cap(c, X86_BUG_11AP);


#ifdef CONFIG_X86_INTEL_USERCOPY
@@ -391,7 +391,7 @@ static void init_intel(struct cpuinfo_x86 *c)

if (c->x86 == 6 && cpu_has_clflush &&
(c->x86_model == 29 || c->x86_model == 46 || c->x86_model == 47))
- set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
+ set_cpu_cap(c, X86_BUG_CLFLUSH_MONITOR);

#ifdef CONFIG_X86_64
if (c->x86 == 15)
--
1.9.0

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