linux-kernel - [PATCH 1/8] x86/cpuid: add X86_FEATURE_NT

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Date:   Wed, 14 Oct 2020 01:32:52 -0700
From:   Ankur Arora <ankur.a.arora@...cle.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     kirill@...temov.name, mhocko@...nel.org,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
        Ankur Arora <ankur.a.arora@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Tony Luck <tony.luck@...el.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Kim Phillips <kim.phillips@....com>,
        Vineela Tummalapalli <vineela.tummalapalli@...el.com>,
        Wei Huang <wei.huang2@....com>
Subject: [PATCH 1/8] x86/cpuid: add X86_FEATURE_NT_GOOD

Enabled on microarchitectures with performant non-temporal MOV (MOVNTI)
instruction.

Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 7b0afd5e6c57..8bae38240346 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -289,6 +289,7 @@
 #define X86_FEATURE_FENCE_SWAPGS_KERNEL	(11*32+ 5) /* "" LFENCE in kernel entry SWAPGS path */
 #define X86_FEATURE_SPLIT_LOCK_DETECT	(11*32+ 6) /* #AC for split lock */
 #define X86_FEATURE_PER_THREAD_MBA	(11*32+ 7) /* "" Per-thread Memory Bandwidth Allocation */
+#define X86_FEATURE_NT_GOOD		(11*32+ 8) /* Non-temporal instructions perform well */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
 #define X86_FEATURE_AVX512_BF16		(12*32+ 5) /* AVX512 BFLOAT16 instructions */
-- 
2.9.3