linux-kernel - [PATCH 10/11] KVM: x86: Make kvm_lapic_set

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Date:   Fri,  4 Feb 2022 21:42:04 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zeng Guang <guang.zeng@...el.com>,
        Chao Gao <chao.gao@...el.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 10/11] KVM: x86: Make kvm_lapic_set_reg() a "private" xAPIC helper

Hide the lapic's "raw" write helper inside lapic.c to force non-APIC code
to go through proper helpers when modification the vAPIC state.  Keep the
read helper visible to outsiders for now, refactoring KVM to hide it too
is possible, it will just take more work to do so.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/lapic.c | 10 ++++++++++
 arch/x86/kvm/lapic.h | 10 ----------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index dd185367a62c..d60eb6251bed 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -68,6 +68,16 @@ static bool lapic_timer_advance_dynamic __read_mostly;
 /* step-by-step approximation to mitigate fluctuation */
 #define LAPIC_TIMER_ADVANCE_ADJUST_STEP 8
 
+static inline void __kvm_lapic_set_reg(char *regs, int reg_off, u32 val)
+{
+	*((u32 *) (regs + reg_off)) = val;
+}
+
+static inline void kvm_lapic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
+{
+	__kvm_lapic_set_reg(apic->regs, reg_off, val);
+}
+
 static __always_inline u64 __kvm_lapic_get_reg64(char *regs, int reg)
 {
 	BUILD_BUG_ON(reg != APIC_ICR);
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index e39e7ec5c2b4..4e4f8a22754f 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -161,16 +161,6 @@ static inline u32 kvm_lapic_get_reg(struct kvm_lapic *apic, int reg_off)
 	return __kvm_lapic_get_reg(apic->regs, reg_off);
 }
 
-static inline void __kvm_lapic_set_reg(char *regs, int reg_off, u32 val)
-{
-	*((u32 *) (regs + reg_off)) = val;
-}
-
-static inline void kvm_lapic_set_reg(struct kvm_lapic *apic, int reg_off, u32 val)
-{
-	__kvm_lapic_set_reg(apic->regs, reg_off, val);
-}
-
 DECLARE_STATIC_KEY_FALSE(kvm_has_noapic_vcpu);
 
 static inline bool lapic_in_kernel(struct kvm_vcpu *vcpu)
-- 
2.35.0.263.gb82422642f-goog