linux-kernel - [PATCH v9 08/17] x86/split_lock: Define MSR TEST

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Date:   Tue, 18 Jun 2019 15:41:10 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "H Peter Anvin" <hpa@...or.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Dave Hansen" <dave.hansen@...el.com>,
        "Paolo Bonzini" <pbonzini@...hat.com>,
        "Radim Krcmar" <rkrcmar@...hat.com>,
        "Christopherson Sean J" <sean.j.christopherson@...el.com>,
        "Ashok Raj" <ashok.raj@...el.com>,
        "Tony Luck" <tony.luck@...el.com>,
        "Dan Williams" <dan.j.williams@...el.com>,
        "Xiaoyao Li " <xiaoyao.li@...el.com>,
        "Sai Praneeth Prakhya" <sai.praneeth.prakhya@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc:     "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, kvm@...r.kernel.org,
        Fenghua Yu <fenghua.yu@...el.com>
Subject: [PATCH v9 08/17] x86/split_lock: Define MSR TEST_CTL register

Setting bit 29 in MSR TEST_CTL (0x33) enables split lock detection and
clearing the bit disables split lock detection.

Define the MSR and the bit. The definitions will be used in enabling or
disabling split lock detection.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 arch/x86/include/asm/msr-index.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 8b2a7899f784..2017cab4717a 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -41,6 +41,10 @@
 
 /* Intel MSRs. Some also available on other CPUs */
 
+#define MSR_TEST_CTL				0x00000033
+#define MSR_TEST_CTL_SPLIT_LOCK_DETECT_BIT	29
+#define MSR_TEST_CTL_SPLIT_LOCK_DETECT		BIT(MSR_TEST_CTL_SPLIT_LOCK_DETECT_BIT)
+
 #define MSR_IA32_SPEC_CTRL		0x00000048 /* Speculation Control */
 #define SPEC_CTRL_IBRS			BIT(0)	   /* Indirect Branch Restricted Speculation */
 #define SPEC_CTRL_STIBP_SHIFT		1	   /* Single Thread Indirect Branch Predictor (STIBP) bit */
-- 
2.19.1