"Michael S. Tsirkin" <mst@xxxxxxxxxx> writes:
> On Tue, Oct 16, 2012 at 11:45:41PM +1030, Rusty Russell wrote:
>> "Michael S. Tsirkin" <mst@xxxxxxxxxx> writes:
>> I was assuming the implementation would keep two complete copies of the
>> config space: writes go to the scratch version, which gets copied to the
>> master version upon latch write.
>
> Yes but config space has some host modifiable registers too.
> So host needs to be careful to avoid overwriting these.
>
> If accesses have side effects that of course breaks too ...
Yes.
>
>> But I do wonder if we should just skip this for now, since we don't
>> have any immediate need.
>>
>> Cheers,
>> Rusty.
>
> MAC setting from guest needs this right now, no?
Ah, I missed that in my table:
Driver Config Device changes Driver writes... after init?
net Y Y N N
block Y Y Y Y
console Y Y N N
rng N N N N
balloon Y Y Y Y
scsi Y N Y N
9p Y N N N
First line should be:
net Y Y Y N
So we could add a new cvq command (eg. #define VIRTIO_NET_CTRL_MAC_SET
1) and a VIRTIO_NET_F_CVQ_MAC_SET feature. Or go ahead with the
latching scheme (which doesn't really help other busses).
Cheers,
Rusty.
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