KVM: move segment_base() into vmx.c
segment_base() is used only by vmx so move it there.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 68712bd..8e2a246 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -634,6 +634,43 @@
return true;
}
+static unsigned long segment_base(u16 selector)
+{
+ struct desc_ptr gdt;
+ struct desc_struct *d;
+ unsigned long table_base;
+ unsigned long v;
+
+ if (!(selector & ~3))
+ return 0;
+
+ native_store_gdt(&gdt);
+ table_base = gdt.address;
+
+ if (selector & 4) { /* from ldt */
+ u16 ldt_selector = kvm_read_ldt();
+
+ if (!(ldt_selector & ~3))
+ return 0;
+
+ table_base = segment_base(ldt_selector);
+ }
+ d = (struct desc_struct *)(table_base + (selector & ~7));
+ v = get_desc_base(d);
+#ifdef CONFIG_X86_64
+ if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
+ v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
+#endif
+ return v;
+}
+
+static inline unsigned long kvm_read_tr_base(void)
+{
+ u16 tr;
+ asm("str %0" : "=g"(tr));
+ return segment_base(tr);
+}
+
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);