KVM: Fix guest sysenter on vmx

The vmx code currently treats the guest's sysenter support msrs as 32-bit
values, which breaks 32-bit compat mode userspace on 64-bit guests.  Fix by
using the native word width of the machine.
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/vmx.c

@@ -371,10 +371,10 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
 		data = vmcs_read32(GUEST_SYSENTER_CS);
 		break;
 	case MSR_IA32_SYSENTER_EIP:
-		data = vmcs_read32(GUEST_SYSENTER_EIP);
+		data = vmcs_readl(GUEST_SYSENTER_EIP);
 		break;
 	case MSR_IA32_SYSENTER_ESP:
-		data = vmcs_read32(GUEST_SYSENTER_ESP);
+		data = vmcs_readl(GUEST_SYSENTER_ESP);
 		break;
 	default:
 		msr = find_msr_entry(vcpu, msr_index);
@@ -412,10 +412,10 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 		vmcs_write32(GUEST_SYSENTER_CS, data);
 		break;
 	case MSR_IA32_SYSENTER_EIP:
-		vmcs_write32(GUEST_SYSENTER_EIP, data);
+		vmcs_writel(GUEST_SYSENTER_EIP, data);
 		break;
 	case MSR_IA32_SYSENTER_ESP:
-		vmcs_write32(GUEST_SYSENTER_ESP, data);
+		vmcs_writel(GUEST_SYSENTER_ESP, data);
 		break;
 	case MSR_IA32_TIME_STAMP_COUNTER:
 		guest_write_tsc(data);