[PATCH 16/27] nVMX: Move register-syncing to a function

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Move code that syncs dirty RSP and RIP registers back to the VMCS, into a
function. We will need to call this function from additional places in the
next patch.

Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
 arch/x86/kvm/vmx.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- .before/arch/x86/kvm/vmx.c	2010-10-17 11:52:02.000000000 +0200
+++ .after/arch/x86/kvm/vmx.c	2010-10-17 11:52:02.000000000 +0200
@@ -5025,6 +5025,15 @@ static void vmx_cancel_injection(struct 
 	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
 }
 
+static inline void sync_cached_regs_to_vmcs(struct kvm_vcpu *vcpu)
+{
+	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
+		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
+	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
+		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
+	vcpu->arch.regs_dirty = 0;
+}
+
 #ifdef CONFIG_X86_64
 #define R "r"
 #define Q "q"
@@ -5046,10 +5055,7 @@ static void vmx_vcpu_run(struct kvm_vcpu
 	if (vmx->emulation_required && emulate_invalid_guest_state)
 		return;
 
-	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
-		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
-	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
-		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
+	sync_cached_regs_to_vmcs(vcpu);
 
 	/* When single-stepping over STI and MOV SS, we must clear the
 	 * corresponding interruptibility bits in the guest state. Otherwise
@@ -5157,7 +5163,6 @@ static void vmx_vcpu_run(struct kvm_vcpu
 
 	vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
 				  | (1 << VCPU_EXREG_PDPTR));
-	vcpu->arch.regs_dirty = 0;
 
 	vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
 
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