KVM: VMX: Fold ept_update_paging_mode_cr4() into its caller
Avi Kivity [Tue, 8 Dec 2009 10:14:42 +0000 (12:14 +0200)]
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>

arch/x86/kvm/vmx.c

index a7ebaa5..694baed 100644 (file)
@@ -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);