KVM: x86 emulator: add get_cached_segment_base() callback to x86_emulate_ops
On VMX it is expensive to call get_cached_descriptor() just to get segment
base since multiple vmcs_reads are done instead of only one. Introduce
new call back get_cached_segment_base() for efficiency.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7c8ed56..8228778 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2097,17 +2097,6 @@
return true;
}
-static u32 get_cached_descriptor_base(struct x86_emulate_ctxt *ctxt,
- struct x86_emulate_ops *ops,
- int seg)
-{
- struct desc_struct desc;
- if (ops->get_cached_descriptor(&desc, seg, ctxt->vcpu))
- return get_desc_base(&desc);
- else
- return ~0;
-}
-
static void save_state_to_tss16(struct x86_emulate_ctxt *ctxt,
struct x86_emulate_ops *ops,
struct tss_segment_16 *tss)
@@ -2383,7 +2372,7 @@
int ret;
u16 old_tss_sel = ops->get_segment_selector(VCPU_SREG_TR, ctxt->vcpu);
ulong old_tss_base =
- get_cached_descriptor_base(ctxt, ops, VCPU_SREG_TR);
+ ops->get_cached_segment_base(VCPU_SREG_TR, ctxt->vcpu);
u32 desc_limit;
/* FIXME: old_tss_base == ~0 ? */