Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
> Il 04/10/2012 14:51, Rusty Russell ha scritto:
>> Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
>>
>>> Il 04/10/2012 02:11, Rusty Russell ha scritto:
>>>>>> There's a reason I haven't done this. I really, really dislike "my
>>>>>> implemention isn't broken" feature bits. We could have an infinite
>>>>>> number of them, for each bug in each device.
>>>>>
>>>>> However, this bug affects (almost) all implementations and (almost) all
>>>>> devices. It even makes sense to reserve a transport feature bit for it
>>>>> instead of a device feature bit.
>>>>
>>>> Perhaps, but we have to fix the bugs first!
>>>
>>> Yes. :) Isn't that what mst's patch does?
>>>
>>>> As I said, my torture patch broke qemu immediately. Since noone has
>>>> leapt onto fixing that, I'll take a look now...
>>>
>>> I can look at virtio-scsi.
>>
>> Actually, you can't, see my reply to Anthony...
>>
>> Message-ID: <87lifm1y1n.fsf@xxxxxxxxxxxxxxx>
>
> struct virtio_scsi_req_cmd {
> // Read-only
> u8 lun[8];
> u64 id;
> u8 task_attr;
> u8 prio;
> u8 crn;
> char cdb[cdb_size];
> char dataout[];
> // Write-only part
> u32 sense_len;
> u32 residual;
> u16 status_qualifier;
> u8 status;
> u8 response;
> u8 sense[sense_size];
> char datain[];
> };
>
> where cdb_size and sense_size come from configuration space. The device
> right now expects everything before dataout/datain to be in a single
> descriptor, but that's in no way part of the spec. Am I missing
> something egregious?
Since you wrote it, I hope not :)
That's good. But virtio_blk's scsi command is insoluble AFAICT. As I
said to Anthony, the best rules are "always" and "never", so I'd really
rather not have to grandfather that in.
Cheers,
Rusty.
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