"Michael S. Tsirkin" <[email protected]> writes:
> On Thu, Mar 21, 2013 at 02:44:50PM +0800, Amos Kong wrote:
>> The lengcy guests don't have mac programming command, we don't know when
>> it's safe to use MAC. This patch changed qemu to makes MAC change effect
>> when the last byte of MAC is written to config space.
>>
>> MAC address takes first 6 bytes of config space of virtio-net, the addr
>> is 5 when the last byte is written in virtio_config_writeb().
>>
>> MAC change will effect when n->mac is updated in virtio_net_set_config().
>>
>> Signed-off-by: Amos Kong <[email protected]>
>
> Let's see what Rusty says about the spec change.
Implementation notes like this belong as a footnote, eg:
For older systems, it is recommended and typical that the device
write byte 5 of the mac address last, so devices can use that as
a trigger to commit the mac address change.
Now, is this a real, or theoretical issue? Have we seen this problem in
practice, or should we continue to ignore it?
Cheers,
Rusty.
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