KVM: x86 emulator: Use a register for ____emulate_2op() destination

Most x86 two operand instructions allow the destination to be a memory operand,
but IMUL (for example) requires that the destination be a register.  Change
____emulate_2op() to take a register for both source and destination so we
can invoke IMUL.

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7818c91..81b0f88 100644 (file)
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -200,7 +200,7 @@ struct group_dual {
                        _PRE_EFLAGS("0", "4", "2")                      \
                        _op _suffix " %"_x"3,%1; "                      \
                        _POST_EFLAGS("0", "4", "2")                     \
-                       : "=m" (_eflags), "=m" (*(_dsttype*)&(_dst).val),\
+                       : "=m" (_eflags), "+q" (*(_dsttype*)&(_dst).val),\
                          "=&r" (_tmp)                                  \
                        : _y ((_src).val), "i" (EFLAGS_MASK));          \
        } while (0)