[PATCH v2 1/2] x86: Add support for the pcommit instruction
Add support for the new pcommit instruction. This instruction was
announced in the document "Intel Architecture Instruction Set Extensions
Programming Reference" with reference number 319433-022.
https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
Signed-off-by: Ross Zwisler
Cc: H Peter Anvin
Cc: Ingo Molnar
Cc: Thomas Gleixner
Cc: Borislav Petkov
---
arch/x86/include/asm/cpufeature.h| 1 +
arch/x86/include/asm/special_insns.h | 6 ++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/cpufeature.h
b/arch/x86/include/asm/cpufeature.h
index bb9b258..dfdd689 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -220,6 +220,7 @@
#define X86_FEATURE_RDSEED ( 9*32+18) /* The RDSEED instruction */
#define X86_FEATURE_ADX( 9*32+19) /* The ADCX and ADOX
instructions */
#define X86_FEATURE_SMAP ( 9*32+20) /* Supervisor Mode Access Prevention
*/
+#define X86_FEATURE_PCOMMIT( 9*32+22) /* PCOMMIT instruction */
#define X86_FEATURE_CLFLUSHOPT ( 9*32+23) /* CLFLUSHOPT instruction */
#define X86_FEATURE_AVX512PF ( 9*32+26) /* AVX-512 Prefetch */
#define X86_FEATURE_AVX512ER ( 9*32+27) /* AVX-512 Exponential and
Reciprocal */
diff --git a/arch/x86/include/asm/special_insns.h
b/arch/x86/include/asm/special_insns.h
index e820c08..1709a2e 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -199,6 +199,12 @@ static inline void clflushopt(volatile void *__p)
"+m" (*(volatile char __force *)__p));
}
+static inline void pcommit(void)
+{
+ alternative(ASM_NOP4, ".byte 0x66, 0x0f, 0xae, 0xf8",
+ X86_FEATURE_PCOMMIT);
+}
+
#define nop() asm volatile ("nop")
--
1.9.3
--
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[PATCH v2 1/2] x86: Add support for the pcommit instruction
Add support for the new pcommit instruction. This instruction was
announced in the document Intel Architecture Instruction Set Extensions
Programming Reference with reference number 319433-022.
https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
Signed-off-by: Ross Zwisler ross.zwis...@linux.intel.com
Cc: H Peter Anvin h.peter.an...@intel.com
Cc: Ingo Molnar mi...@kernel.org
Cc: Thomas Gleixner t...@linutronix.de
Cc: Borislav Petkov b...@alien8.de
---
arch/x86/include/asm/cpufeature.h| 1 +
arch/x86/include/asm/special_insns.h | 6 ++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/cpufeature.h
b/arch/x86/include/asm/cpufeature.h
index bb9b258..dfdd689 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -220,6 +220,7 @@
#define X86_FEATURE_RDSEED ( 9*32+18) /* The RDSEED instruction */
#define X86_FEATURE_ADX( 9*32+19) /* The ADCX and ADOX
instructions */
#define X86_FEATURE_SMAP ( 9*32+20) /* Supervisor Mode Access Prevention
*/
+#define X86_FEATURE_PCOMMIT( 9*32+22) /* PCOMMIT instruction */
#define X86_FEATURE_CLFLUSHOPT ( 9*32+23) /* CLFLUSHOPT instruction */
#define X86_FEATURE_AVX512PF ( 9*32+26) /* AVX-512 Prefetch */
#define X86_FEATURE_AVX512ER ( 9*32+27) /* AVX-512 Exponential and
Reciprocal */
diff --git a/arch/x86/include/asm/special_insns.h
b/arch/x86/include/asm/special_insns.h
index e820c08..1709a2e 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -199,6 +199,12 @@ static inline void clflushopt(volatile void *__p)
+m (*(volatile char __force *)__p));
}
+static inline void pcommit(void)
+{
+ alternative(ASM_NOP4, .byte 0x66, 0x0f, 0xae, 0xf8,
+ X86_FEATURE_PCOMMIT);
+}
+
#define nop() asm volatile (nop)
--
1.9.3
--
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