KVM: VMX: Use host_gdt variable wherever we need the host gdt

Now that we have the host gdt conveniently stored in a variable, make use
of it instead of querying the cpu.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

arch/x86/kvm/vmx.c

@@ -706,11 +706,10 @@ static void reload_tss(void)
 	/*
 	 * VT restores TR but not its size.  Useless.
 	 */
-	struct desc_ptr gdt;
+	struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
 	struct desc_struct *descs;
 
-	native_store_gdt(&gdt);
-	descs = (void *)gdt.address;
+	descs = (void *)gdt->address;
 	descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
 	load_TR_desc();
 }
@@ -753,7 +752,7 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
 
 static unsigned long segment_base(u16 selector)
 {
-	struct desc_ptr gdt;
+	struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
 	struct desc_struct *d;
 	unsigned long table_base;
 	unsigned long v;
@@ -761,8 +760,7 @@ static unsigned long segment_base(u16 selector)
 	if (!(selector & ~3))
 		return 0;
 
-	native_store_gdt(&gdt);
-	table_base = gdt.address;
+	table_base = gdt->address;
 
 	if (selector & 4) {           /* from ldt */
 		u16 ldt_selector = kvm_read_ldt();
@@ -897,7 +895,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 	}
 
 	if (vcpu->cpu != cpu) {
-		struct desc_ptr dt;
+		struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
 		unsigned long sysenter_esp;
 
 		kvm_migrate_timers(vcpu);
@@ -913,8 +911,7 @@ static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 		 * processors.
 		 */
 		vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
-		native_store_gdt(&dt);
-		vmcs_writel(HOST_GDTR_BASE, dt.address);   /* 22.2.4 */
+		vmcs_writel(HOST_GDTR_BASE, gdt->address);   /* 22.2.4 */
 
 		rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
 		vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */