From: Avi Kivity <avi@redhat.com>
Date: Tue, 8 Dec 2009 10:14:42 +0000 (+0200)
Subject: KVM: VMX: Fold ept_update_paging_mode_cr4() into its caller
X-Git-Tag: v2.6.34-rc1~193^2~136
X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=bc23008b610dda1b0e69cd473b31c1391d6873f2

KVM: VMX: Fold ept_update_paging_mode_cr4() into its caller

ept_update_paging_mode_cr4() accesses vcpu->arch.cr4 directly, which usually
needs to be accessed via kvm_read_cr4().  In this case, we can't, since cr4
is in the process of being updated.  Instead of adding inane comments, fold
the function into its caller (vmx_set_cr4), so it can use the not-yet-committed
cr4 directly.

Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a7ebaa5..694baed 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1680,16 +1680,6 @@ static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
 		*hw_cr0 &= ~X86_CR0_WP;
 }
 
-static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
-					struct kvm_vcpu *vcpu)
-{
-	if (!is_paging(vcpu)) {
-		*hw_cr4 &= ~X86_CR4_PAE;
-		*hw_cr4 |= X86_CR4_PSE;
-	} else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
-		*hw_cr4 &= ~X86_CR4_PAE;
-}
-
 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
@@ -1767,8 +1757,14 @@ static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 		    KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
 
 	vcpu->arch.cr4 = cr4;
-	if (enable_ept)
-		ept_update_paging_mode_cr4(&hw_cr4, vcpu);
+	if (enable_ept) {
+		if (!is_paging(vcpu)) {
+			hw_cr4 &= ~X86_CR4_PAE;
+			hw_cr4 |= X86_CR4_PSE;
+		} else if (!(cr4 & X86_CR4_PAE)) {
+			hw_cr4 &= ~X86_CR4_PAE;
+		}
+	}
 
 	vmcs_writel(CR4_READ_SHADOW, cr4);
 	vmcs_writel(GUEST_CR4, hw_cr4);