KVM: x86 emulator: convert bsf/bsr instructions to emulate_2op_SrcV_nobyte()

The instruction emulation for bsrw is broken in KVM because
the code always uses bsr with 32 or 64 bit operand size for
emulation. Fix that by using emulate_2op_SrcV_nobyte() macro
to use guest operand size for emulation.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 24 deletions

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7fd25763b0e0..f95d242ee9f7 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3133,35 +3133,13 @@ static int em_btc(struct x86_emulate_ctxt *ctxt)
 
 static int em_bsf(struct x86_emulate_ctxt *ctxt)
 {
-        u8 zf;
-
-        __asm__ ("bsf %2, %0; setz %1"
-                 : "=r"(ctxt->dst.val), "=q"(zf)
-                 : "r"(ctxt->src.val));
-
-        ctxt->eflags &= ~X86_EFLAGS_ZF;
-        if (zf) {
-                ctxt->eflags |= X86_EFLAGS_ZF;
-                /* Disable writeback. */
-                ctxt->dst.type = OP_NONE;
-        }
+        emulate_2op_SrcV_nobyte(ctxt, "bsf");
         return X86EMUL_CONTINUE;
 }
 
 static int em_bsr(struct x86_emulate_ctxt *ctxt)
 {
-        u8 zf;
-
-        __asm__ ("bsr %2, %0; setz %1"
-                 : "=r"(ctxt->dst.val), "=q"(zf)
-                 : "r"(ctxt->src.val));
-
-        ctxt->eflags &= ~X86_EFLAGS_ZF;
-        if (zf) {
-                ctxt->eflags |= X86_EFLAGS_ZF;
-                /* Disable writeback. */
-                ctxt->dst.type = OP_NONE;
-        }
+        emulate_2op_SrcV_nobyte(ctxt, "bsr");
         return X86EMUL_CONTINUE;
 }