KVM: VMX: Bring the common code to header file

This patch brings some of the code from vmx to x86.h header file. Now, we
can share this code between vmx and svm. Modified couple functions to make
it common.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

arch/x86/kvm/vmx.c

@@ -168,24 +168,17 @@ module_param_named(preemption_timer, enable_preemption_timer, bool, S_IRUGO);
  * Time is measured based on a counter that runs at the same rate as the TSC,
  * refer SDM volume 3b section 21.6.13 & 22.1.3.
  */
-#define KVM_VMX_DEFAULT_PLE_GAP           128
-#define KVM_VMX_DEFAULT_PLE_WINDOW        4096
-#define KVM_VMX_DEFAULT_PLE_WINDOW_GROW   2
-#define KVM_VMX_DEFAULT_PLE_WINDOW_SHRINK 0
-#define KVM_VMX_DEFAULT_PLE_WINDOW_MAX    UINT_MAX
-
-static unsigned int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
-module_param(ple_gap, uint, 0444);
+static unsigned int ple_gap = KVM_DEFAULT_PLE_GAP;
 
 static unsigned int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
 module_param(ple_window, uint, 0444);
 
 /* Default doubles per-vcpu window every exit. */
-static unsigned int ple_window_grow = KVM_VMX_DEFAULT_PLE_WINDOW_GROW;
+static unsigned int ple_window_grow = KVM_DEFAULT_PLE_WINDOW_GROW;
 module_param(ple_window_grow, uint, 0444);
 
 /* Default resets per-vcpu window every exit to ple_window. */
-static unsigned int ple_window_shrink = KVM_VMX_DEFAULT_PLE_WINDOW_SHRINK;
+static unsigned int ple_window_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK;
 module_param(ple_window_shrink, uint, 0444);
 
 /* Default is to compute the maximum so we can never overflow. */
@@ -6982,41 +6975,14 @@ out:
 	return ret;
 }
 
-static unsigned int __grow_ple_window(unsigned int val)
-{
-	u64 ret = val;
-
-	if (ple_window_grow < 1)
-		return ple_window;
-
-	if (ple_window_grow < ple_window)
-		ret *= ple_window_grow;
-	else
-		ret += ple_window_grow;
-
-	return min(ret, (u64)ple_window_max);
-}
-
-static unsigned int __shrink_ple_window(unsigned int val,
-		unsigned int modifier, unsigned int minimum)
-{
-	if (modifier < 1)
-		return ple_window;
-
-	if (modifier < ple_window)
-		val /= modifier;
-	else
-		val -= modifier;
-
-	return max(val, minimum);
-}
-
 static void grow_ple_window(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 	int old = vmx->ple_window;
 
-	vmx->ple_window = __grow_ple_window(old);
+	vmx->ple_window = __grow_ple_window(old, ple_window,
+					    ple_window_grow,
+					    ple_window_max);
 
 	if (vmx->ple_window != old)
 		vmx->ple_window_dirty = true;
@@ -7029,8 +6995,9 @@ static void shrink_ple_window(struct kvm_vcpu *vcpu)
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
 	int old = vmx->ple_window;
 
-	vmx->ple_window = __shrink_ple_window(old,
-	                                      ple_window_shrink, ple_window);
+	vmx->ple_window = __shrink_ple_window(old, ple_window,
+					      ple_window_shrink,
+					      ple_window);
 
 	if (vmx->ple_window != old)
 		vmx->ple_window_dirty = true;

arch/x86/kvm/x86.h

@@ -6,6 +6,42 @@
 #include <asm/pvclock.h>
 #include "kvm_cache_regs.h"
 
+#define KVM_DEFAULT_PLE_GAP		128
+#define KVM_VMX_DEFAULT_PLE_WINDOW	4096
+#define KVM_DEFAULT_PLE_WINDOW_GROW	2
+#define KVM_DEFAULT_PLE_WINDOW_SHRINK	0
+#define KVM_VMX_DEFAULT_PLE_WINDOW_MAX	UINT_MAX
+
+static inline unsigned int __grow_ple_window(unsigned int val,
+		unsigned int base, unsigned int modifier, unsigned int max)
+{
+	u64 ret = val;
+
+	if (modifier < 1)
+		return base;
+
+	if (modifier < base)
+		ret *= modifier;
+	else
+		ret += modifier;
+
+	return min(ret, (u64)max);
+}
+
+static inline unsigned int __shrink_ple_window(unsigned int val,
+		unsigned int base, unsigned int modifier, unsigned int min)
+{
+	if (modifier < 1)
+		return base;
+
+	if (modifier < base)
+		val /= modifier;
+	else
+		val -= modifier;
+
+	return max(val, min);
+}
+
 #define MSR_IA32_CR_PAT_DEFAULT  0x0007040600070406ULL
 
 static inline void kvm_clear_exception_queue(struct kvm_vcpu *vcpu)