[PATCH v2 06/12] KVM: x86: Move TSC scaling logic out of call-back adjust_tsc_offset()

[Haozhong Zhang]

For both VMX and SVM, if the 2nd argument of call-back
adjust_tsc_offset() is the host TSC, then adjust_tsc_offset() will scale
it first. This patch moves this common TSC scaling logic to its caller
adjust_tsc_offset_host() and rename the call-back adjust_tsc_offset() to
adjust_tsc_offset_guest().

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
 arch/x86/include/asm/kvm_host.h | 15 +--------------
 arch/x86/kvm/svm.c              | 10 ++--------
 arch/x86/kvm/vmx.c              |  4 ++--
 include/linux/kvm_host.h        | 16 ++++++++++++++++
 4 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d5e820b..b70cebb 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -845,7 +845,7 @@ struct kvm_x86_ops {
 	int (*get_lpage_level)(void);
 	bool (*rdtscp_supported)(void);
 	bool (*invpcid_supported)(void);
-	void (*adjust_tsc_offset)(struct kvm_vcpu *vcpu, s64 adjustment, bool host);
+	void (*adjust_tsc_offset_guest)(struct kvm_vcpu *vcpu, s64 adjustment);
 
 	void (*set_tdp_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
 
@@ -920,19 +920,6 @@ struct kvm_arch_async_pf {
 	bool direct_map;
 };
 
-extern struct kvm_x86_ops *kvm_x86_ops;
-
-static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
-					   s64 adjustment)
-{
-	kvm_x86_ops->adjust_tsc_offset(vcpu, adjustment, false);
-}
-
-static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
-{
-	kvm_x86_ops->adjust_tsc_offset(vcpu, adjustment, true);
-}
-
 int kvm_mmu_module_init(void);
 void kvm_mmu_module_exit(void);
 
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 481fdd3..9cfc02a 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -984,16 +984,10 @@ static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
 	mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 }
 
-static void svm_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
+static void svm_adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, s64 adjustment)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 
-	if (host) {
-		if (vcpu->arch.tsc_scaling_ratio != TSC_RATIO_DEFAULT)
-			WARN_ON(adjustment < 0);
-		adjustment = kvm_scale_tsc(vcpu, (u64)adjustment);
-	}
-
 	svm->vmcb->control.tsc_offset += adjustment;
 	if (is_guest_mode(vcpu))
 		svm->nested.hsave->control.tsc_offset += adjustment;
@@ -4361,7 +4355,7 @@ static struct kvm_x86_ops svm_x86_ops = {
 
 	.read_tsc_offset = svm_read_tsc_offset,
 	.write_tsc_offset = svm_write_tsc_offset,
-	.adjust_tsc_offset = svm_adjust_tsc_offset,
+	.adjust_tsc_offset_guest = svm_adjust_tsc_offset_guest,
 	.read_l1_tsc = svm_read_l1_tsc,
 
 	.set_tdp_cr3 = set_tdp_cr3,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7896395..1f72480 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2413,7 +2413,7 @@ static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
 	}
 }
 
-static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
+static void vmx_adjust_tsc_offset_guest(struct kvm_vcpu *vcpu, s64 adjustment)
 {
 	u64 offset = vmcs_read64(TSC_OFFSET);
 
@@ -10809,7 +10809,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
 
 	.read_tsc_offset = vmx_read_tsc_offset,
 	.write_tsc_offset = vmx_write_tsc_offset,
-	.adjust_tsc_offset = vmx_adjust_tsc_offset,
+	.adjust_tsc_offset_guest = vmx_adjust_tsc_offset_guest,
 	.read_l1_tsc = vmx_read_l1_tsc,
 
 	.set_tdp_cr3 = vmx_set_cr3,
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3556148..95a6bf2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1186,4 +1186,20 @@ int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
 
 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc);
 
+extern struct kvm_x86_ops *kvm_x86_ops;
+
+static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
+					   s64 adjustment)
+{
+	kvm_x86_ops->adjust_tsc_offset_guest(vcpu, adjustment);
+}
+
+static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
+{
+	if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio)
+		WARN_ON(adjustment < 0);
+	adjustment = kvm_scale_tsc(vcpu, (u64) adjustment);
+	kvm_x86_ops->adjust_tsc_offset_guest(vcpu, adjustment);
+}
+
 #endif
-- 
2.4.8

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