On 03/19/2012 08:14 AM, Zhang, Yang Z wrote:
> The new logic is compatible with old. So it should not block migrate from old
> version. But new version cannot migrate to old.
>
> +static int rtc_load_old(QEMUFile *f, void *opaque, int version_id)
> +{
> + RTCState *s = opaque;
> +
> + if (version_id > 2) {
> + return -EINVAL;
> + }
> +
> + qemu_get_buffer(f, s->cmos_data, sizeof(s->cmos_data));
> + /* dummy load for compatibility */
> + qemu_get_byte(f); /* cmos_index */
> + qemu_get_be32(f); /* tm_sec */
> + qemu_get_be32(f); /* tm_min */
> + qemu_get_be32(f); /* tm_hour */
> + qemu_get_be32(f); /* tm_wday */
> + qemu_get_be32(f); /* tm_mday */
> + qemu_get_be32(f); /* tm_mon */
> + qemu_get_be32(f); /* tm_year */
> + qemu_get_be64(f); /* periodic_timer */
> + qemu_get_be64(f); /* next_periodic_time */
> + qemu_get_be64(f); /* next_second_time */
> + qemu_get_be64(f); /* second_timer */
> + qemu_get_be64(f); /* second_timer2 */
> + qemu_get_be32(f); /* irq_coalesced */
> + qemu_get_be32(f); /* period */
> +
Why don't you just convert the data to the new in-memory format? Then
you don't need a version update.
> +
> + rtc_set_date_from_host(&s->dev);
If the guest is intentionally running with an incorrect date, this breaks.
--
error compiling committee.c: too many arguments to function
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