From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Andy Lutomirski <luto@amacapital.net>
Cc: x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org,
David Laight <David.Laight@aculab.com>,
Xiaoyao Li <xiaoyao.li@intel.com>
Subject: [PATCH v2 2/6] x86/split_lock: Add and export split_lock_detect_set()
Date: Mon, 3 Feb 2020 23:16:04 +0800 [thread overview]
Message-ID: <20200203151608.28053-3-xiaoyao.li@intel.com> (raw)
In-Reply-To: <20200203151608.28053-1-xiaoyao.li@intel.com>
Add and export split_lock_detect_set(), which will be used by KVM module
to change the MSR_TEST_CTRL.SPLIT_LOCK_DETECT bit to switch SLD.
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
---
arch/x86/include/asm/cpu.h | 1 +
arch/x86/kernel/cpu/intel.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/arch/x86/include/asm/cpu.h b/arch/x86/include/asm/cpu.h
index 167d0539e0ad..b46262afa6c1 100644
--- a/arch/x86/include/asm/cpu.h
+++ b/arch/x86/include/asm/cpu.h
@@ -52,6 +52,7 @@ extern enum split_lock_detect_state get_split_lock_detect_state(void);
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(struct pt_regs *regs, long error_code);
+extern void split_lock_detect_set(bool on);
#else
static inline enum split_lock_detect_state get_split_lock_detect_state(void)
{
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index a810cd022db5..44138dd64808 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1088,6 +1088,12 @@ void switch_to_sld(unsigned long tifn)
__sld_msr_set(!(tifn & _TIF_SLD));
}
+void split_lock_detect_set(bool on)
+{
+ __sld_msr_set(on);
+}
+EXPORT_SYMBOL_GPL(split_lock_detect_set);
+
#define SPLIT_LOCK_CPU(model) {X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY}
/*
--
2.23.0
next prev parent reply other threads:[~2020-02-03 15:21 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-03 15:16 [PATCH v2 0/6] kvm/split_lock: Add feature split lock detection support in kvm Xiaoyao Li
2020-02-03 15:16 ` [PATCH v2 1/6] x86/split_lock: Add and export get_split_lock_detect_state() Xiaoyao Li
2020-02-03 21:45 ` Sean Christopherson
2020-02-03 15:16 ` Xiaoyao Li [this message]
2020-02-03 15:16 ` [PATCH v2 3/6] kvm: x86: Emulate split-lock access as a write Xiaoyao Li
2020-02-03 20:54 ` Sean Christopherson
2020-02-04 2:55 ` Xiaoyao Li
2020-02-11 12:20 ` Paolo Bonzini
2020-02-11 13:22 ` Thomas Gleixner
2020-02-11 13:34 ` Paolo Bonzini
2020-02-11 14:02 ` Xiaoyao Li
2020-02-11 14:34 ` David Laight
2020-02-27 0:11 ` Sean Christopherson
2020-03-12 11:42 ` Xiaoyao Li
2020-03-12 15:00 ` Paolo Bonzini
2020-02-03 15:16 ` [PATCH v2 4/6] kvm: vmx: Extend VMX's #AC handding for split lock in guest Xiaoyao Li
2020-02-03 21:14 ` Sean Christopherson
2020-02-04 6:46 ` Xiaoyao Li
2020-02-10 21:30 ` Sean Christopherson
2020-02-03 15:16 ` [PATCH v2 5/6] kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES Xiaoyao Li
2020-02-03 21:43 ` Sean Christopherson
2020-02-04 9:19 ` Xiaoyao Li
2020-02-04 9:37 ` Peter Zijlstra
2020-02-11 3:52 ` Andy Lutomirski
2020-02-11 12:38 ` Peter Zijlstra
2020-02-03 15:16 ` [PATCH v2 6/6] x86: vmx: virtualize split lock detection Xiaoyao Li
2020-02-03 15:58 ` Xiaoyao Li
2020-02-03 18:52 ` Andy Lutomirski
2020-02-03 21:42 ` Sean Christopherson
2020-02-04 2:52 ` Xiaoyao Li
2020-02-04 5:35 ` Sean Christopherson
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