Re: [Qemu-devel] [PATCH v6 7/8] virtio-serial-bus: use virtio wrappers to access headers

[Alexander Graf <agraf@suse.de>]

On 03/28/2014 11:58 AM, Greg Kurz wrote:
> From: Rusty Russell <rusty@rustcorp.com.au>
>
> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
> Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
> [ use per-device needs_byteswap flag,
>    Greg Kurz <gkurz@linux.vnet.ibm.com> ]
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
>   hw/char/virtio-serial-bus.c |   39 +++++++++++++++++++++++----------------
>   1 file changed, 23 insertions(+), 16 deletions(-)
>
> diff --git a/hw/char/virtio-serial-bus.c b/hw/char/virtio-serial-bus.c
> index 2b647b6..7a84b2a 100644
> --- a/hw/char/virtio-serial-bus.c
> +++ b/hw/char/virtio-serial-bus.c
> @@ -24,6 +24,7 @@
>   #include "hw/sysbus.h"
>   #include "trace.h"
>   #include "hw/virtio/virtio-serial.h"
> +#include "hw/virtio/virtio-access.h"
>   
>   static VirtIOSerialPort *find_port_by_id(VirtIOSerial *vser, uint32_t id)
>   {
> @@ -185,9 +186,9 @@ static size_t send_control_event(VirtIOSerial *vser, uint32_t port_id,
>   {
>       struct virtio_console_control cpkt;
>   
> -    stl_p(&cpkt.id, port_id);
> -    stw_p(&cpkt.event, event);
> -    stw_p(&cpkt.value, value);
> +    virtio_stl_p(&cpkt.id, port_id, VIRTIO_DEVICE(vser));

These are dynamic casts. You at least want to do these only once, 
probably even use some faster form of casting.


Alex

> +    virtio_stw_p(&cpkt.event, event, VIRTIO_DEVICE(vser));
> +    virtio_stw_p(&cpkt.value, value, VIRTIO_DEVICE(vser));
>   
>       trace_virtio_serial_send_control_event(port_id, event, value);
>       return send_control_msg(vser, &cpkt, sizeof(cpkt));
> @@ -291,8 +292,8 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
>           return;
>       }
>   
> -    cpkt.event = lduw_p(&gcpkt->event);
> -    cpkt.value = lduw_p(&gcpkt->value);
> +    cpkt.event = virtio_lduw_p(&gcpkt->event, VIRTIO_DEVICE(vser));
> +    cpkt.value = virtio_lduw_p(&gcpkt->value, VIRTIO_DEVICE(vser));
>   
>       trace_virtio_serial_handle_control_message(cpkt.event, cpkt.value);
>   
> @@ -312,10 +313,11 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
>           return;
>       }
>   
> -    port = find_port_by_id(vser, ldl_p(&gcpkt->id));
> +    port = find_port_by_id(vser, virtio_ldl_p(&gcpkt->id, VIRTIO_DEVICE(vser)));
>       if (!port) {
>           error_report("virtio-serial-bus: Unexpected port id %u for device %s",
> -                     ldl_p(&gcpkt->id), vser->bus.qbus.name);
> +                     virtio_ldl_p(&gcpkt->id, VIRTIO_DEVICE(vser)),
> +                     vser->bus.qbus.name);
>           return;
>       }
>   
> @@ -342,9 +344,10 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
>           }
>   
>           if (port->name) {
> -            stl_p(&cpkt.id, port->id);
> -            stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME);
> -            stw_p(&cpkt.value, 1);
> +            virtio_stl_p(&cpkt.id, port->id, VIRTIO_DEVICE(vser));
> +            virtio_stw_p(&cpkt.event, VIRTIO_CONSOLE_PORT_NAME,
> +                         VIRTIO_DEVICE(vser));
> +            virtio_stw_p(&cpkt.value, 1, VIRTIO_DEVICE(vser));
>   
>               buffer_len = sizeof(cpkt) + strlen(port->name) + 1;
>               buffer = g_malloc(buffer_len);
> @@ -536,7 +539,7 @@ static void virtio_serial_save(QEMUFile *f, void *opaque)
>       qemu_put_be32s(f, &s->config.max_nr_ports);
>   
>       /* The ports map */
> -    max_nr_ports = tswap32(s->config.max_nr_ports);
> +    max_nr_ports = virtio_tswap32(s->config.max_nr_ports, VIRTIO_DEVICE(s));
>       for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
>           qemu_put_be32s(f, &s->ports_map[i]);
>       }
> @@ -690,8 +693,9 @@ static int virtio_serial_load(QEMUFile *f, void *opaque, int version_id)
>       qemu_get_be16s(f, &s->config.rows);
>   
>       qemu_get_be32s(f, &max_nr_ports);
> -    tswap32s(&max_nr_ports);
> -    if (max_nr_ports > tswap32(s->config.max_nr_ports)) {
> +    virtio_tswap32s(&max_nr_ports, VIRTIO_DEVICE(s));
> +    if (max_nr_ports > virtio_tswap32(s->config.max_nr_ports,
> +                                      VIRTIO_DEVICE(s))) {
>           /* Source could have had more ports than us. Fail migration. */
>           return -EINVAL;
>       }
> @@ -760,7 +764,8 @@ static uint32_t find_free_port_id(VirtIOSerial *vser)
>   {
>       unsigned int i, max_nr_ports;
>   
> -    max_nr_ports = tswap32(vser->config.max_nr_ports);
> +    max_nr_ports = virtio_tswap32(vser->config.max_nr_ports,
> +                                  VIRTIO_DEVICE(vser));
>       for (i = 0; i < (max_nr_ports + 31) / 32; i++) {
>           uint32_t map, bit;
>   
> @@ -848,7 +853,8 @@ static void virtser_port_device_realize(DeviceState *dev, Error **errp)
>           }
>       }
>   
> -    max_nr_ports = tswap32(port->vser->config.max_nr_ports);
> +    max_nr_ports = virtio_tswap32(port->vser->config.max_nr_ports,
> +                                  VIRTIO_DEVICE(port->vser));
>       if (port->id >= max_nr_ports) {
>           error_setg(errp, "virtio-serial-bus: Out-of-range port id specified, "
>                            "max. allowed: %u", max_nr_ports - 1);
> @@ -949,7 +955,8 @@ static void virtio_serial_device_realize(DeviceState *dev, Error **errp)
>           vser->ovqs[i] = virtio_add_queue(vdev, 128, handle_output);
>       }
>   
> -    vser->config.max_nr_ports = tswap32(vser->serial.max_virtserial_ports);
> +    vser->config.max_nr_ports =
> +        virtio_tswap32(vser->serial.max_virtserial_ports, VIRTIO_DEVICE(vser));
>       vser->ports_map = g_malloc0(((vser->serial.max_virtserial_ports + 31) / 32)
>           * sizeof(vser->ports_map[0]));
>       /*
>