Re: [Qemu-devel] [RFC v6 06/14] configure: Use slow-path for atomic only when the softmmu is enabled

[Paolo Bonzini <pbonzini@redhat.com>]

On 14/12/2015 09:41, Alvise Rigo wrote:
> Use the new slow path for atomic instruction translation when the
> softmmu is enabled.
> 
> Suggested-by: Jani Kokkonen <jani.kokkonen@huawei.com>
> Suggested-by: Claudio Fontana <claudio.fontana@huawei.com>
> Signed-off-by: Alvise Rigo <a.rigo@virtualopensystems.com>
> ---
>  configure | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/configure b/configure
> index b9552fd..cc3891a 100755
> --- a/configure
> +++ b/configure
> @@ -4794,6 +4794,7 @@ echo "Install blobs     $blobs"
>  echo "KVM support       $kvm"
>  echo "RDMA support      $rdma"
>  echo "TCG interpreter   $tcg_interpreter"
> +echo "use ld/st excl    $softmmu"
>  echo "fdt support       $fdt"
>  echo "preadv support    $preadv"
>  echo "fdatasync         $fdatasync"
> @@ -5186,6 +5187,9 @@ fi
>  if test "$tcg_interpreter" = "yes" ; then
>    echo "CONFIG_TCG_INTERPRETER=y" >> $config_host_mak
>  fi
> +if test "$softmmu" = "yes" ; then
> +  echo "CONFIG_TCG_USE_LDST_EXCL=y" >> $config_host_mak
> +fi

Just use CONFIG_SOFTMMU in translate.c, no?

A target other than ARM might need ll/sc in user-mode emulation as well.

Paolo

>  if test "$fdatasync" = "yes" ; then
>    echo "CONFIG_FDATASYNC=y" >> $config_host_mak
>  fi
>