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From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	hpa@zytor.com, Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	tony.luck@intel.com
Cc: peterz@infradead.org, fenghua.yu@intel.com, x86@kernel.org,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Xiaoyao Li <xiaoyao.li@intel.com>
Subject: [PATCH v3 4/8] x86/split_lock: Add and export split_lock_detect_enabled() and split_lock_detect_fatal()
Date: Thu,  6 Feb 2020 15:04:08 +0800	[thread overview]
Message-ID: <20200206070412.17400-5-xiaoyao.li@intel.com> (raw)
In-Reply-To: <20200206070412.17400-1-xiaoyao.li@intel.com>

These two functions will be used by KVM to check whether host's
sld_state.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
 arch/x86/include/asm/cpu.h  |  4 ++++
 arch/x86/kernel/cpu/intel.c | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 2b20829db450..f5172dbd3f01 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -46,6 +46,8 @@ unsigned int x86_stepping(unsigned int sig);
 extern void __init cpu_set_core_cap_bits(struct cpuinfo_x86 *c);
 extern void switch_to_sld(unsigned long tifn);
 extern bool handle_user_split_lock(unsigned long ip);
+extern bool split_lock_detect_enabled(void);
+extern bool split_lock_detect_fatal(void);
 #else
 static inline void __init cpu_set_core_cap_bits(struct cpuinfo_x86 *c) {}
 static inline void switch_to_sld(unsigned long tifn) {}
@@ -53,5 +55,7 @@ static inline bool handle_user_split_lock(unsigned long ip)
 {
 	return false;
 }
+static inline bool split_lock_detect_enabled(void) { return false; }
+static inline bool split_lock_detect_fatal(void) { return false; }
 #endif
 #endif /* _ASM_X86_CPU_H */
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index ff27d026cb4a..b67b46ea66df 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1131,3 +1131,15 @@ void __init cpu_set_core_cap_bits(struct cpuinfo_x86 *c)
 	if (ia32_core_caps & MSR_IA32_CORE_CAPS_SPLIT_LOCK_DETECT)
 		split_lock_setup();
 }
+
+bool split_lock_detect_enabled(void)
+{
+	return sld_state != sld_off;
+}
+EXPORT_SYMBOL_GPL(split_lock_detect_enabled);
+
+bool split_lock_detect_fatal(void)
+{
+	return sld_state == sld_fatal;
+}
+EXPORT_SYMBOL_GPL(split_lock_detect_fatal);
-- 
2.23.0


  parent reply	other threads:[~2020-02-06  7:09 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-06  7:04 [PATCH v3 0/8] kvm/split_lock: Add feature split lock detection support in kvm Xiaoyao Li
2020-02-06  7:04 ` [PATCH v3 1/8] x86/split_lock: Export handle_user_split_lock() Xiaoyao Li
2020-03-03 18:42   ` Sean Christopherson
2020-02-06  7:04 ` [PATCH v3 2/8] x86/split_lock: Ensure X86_FEATURE_SPLIT_LOCK_DETECT means the existence of feature Xiaoyao Li
2020-03-03 18:55   ` Sean Christopherson
2020-03-03 19:41     ` Sean Christopherson
2020-03-04  1:49       ` Xiaoyao Li
2020-03-05 16:23         ` Sean Christopherson
2020-03-06  2:15           ` Xiaoyao Li
2020-03-04  2:20     ` Xiaoyao Li
2020-02-06  7:04 ` [PATCH v3 3/8] x86/split_lock: Cache the value of MSR_TEST_CTRL in percpu data Xiaoyao Li
2020-02-06 20:23   ` Arvind Sankar
2020-02-07  4:18     ` Xiaoyao Li
2020-03-03 19:18   ` Sean Christopherson
2020-03-05  6:48     ` Xiaoyao Li
2020-02-06  7:04 ` Xiaoyao Li [this message]
2020-03-03 18:59   ` [PATCH v3 4/8] x86/split_lock: Add and export split_lock_detect_enabled() and split_lock_detect_fatal() Sean Christopherson
2020-02-06  7:04 ` [PATCH v3 5/8] kvm: x86: Emulate split-lock access as a write Xiaoyao Li
2020-02-06  7:04 ` [PATCH v3 6/8] kvm: vmx: Extend VMX's #AC interceptor to handle split lock #AC happens in guest Xiaoyao Li
2020-03-03 19:08   ` Sean Christopherson
2020-02-06  7:04 ` [PATCH v3 7/8] kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES Xiaoyao Li
2020-02-06  7:04 ` [PATCH v3 8/8] x86: vmx: virtualize split lock detection Xiaoyao Li
2020-02-07 18:27   ` Arvind Sankar
2020-02-08  4:51     ` Xiaoyao Li
2020-03-03 19:30   ` Sean Christopherson
2020-03-05 14:16     ` Xiaoyao Li
2020-03-05 16:49       ` Sean Christopherson
2020-03-06  0:29         ` Xiaoyao Li

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