KVM: VMX: Fix exit qualification width on i386

According to Intel Software Developer's Manual, Vol. 3B, Appendix H.4.2,
exit qualification should be of natural width. However, current code
uses u64 as the data type for this register, which occasionally
introduces invalid value to VMExit handling logics. This patch fixes
this bug.

I have tested Windows and Linux guest on i386 host, and they can boot
successfully with this patch.

Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 471725e..49ac609 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1836,12 +1836,12 @@
 
 static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
-	u64 exit_qualification;
+	unsigned long exit_qualification;
 	int size, down, in, string, rep;
 	unsigned port;
 
 	++vcpu->stat.io_exits;
-	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
+	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 	string = (exit_qualification & 16) != 0;
 
 	if (string) {
@@ -1873,11 +1873,11 @@
 
 static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
-	u64 exit_qualification;
+	unsigned long exit_qualification;
 	int cr;
 	int reg;
 
-	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
+	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 	cr = exit_qualification & 15;
 	reg = (exit_qualification >> 8) & 15;
 	switch ((exit_qualification >> 4) & 3) {
@@ -1946,7 +1946,7 @@
 
 static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
-	u64 exit_qualification;
+	unsigned long exit_qualification;
 	unsigned long val;
 	int dr, reg;
 
@@ -1954,7 +1954,7 @@
 	 * FIXME: this code assumes the host is debugging the guest.
 	 *        need to deal with guest debugging itself too.
 	 */
-	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
+	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
 	dr = exit_qualification & 7;
 	reg = (exit_qualification >> 8) & 15;
 	vcpu_load_rsp_rip(vcpu);