Re: [Qemu-devel] [PATCH] ATA: Allow WIN_SECURITY_FREEZE_LOCK as nop

[Alexander Graf]

On 09.02.2012, at 15:59, Kevin Wolf wrote:

> Am 09.02.2012 15:49, schrieb Alexander Graf:
>> 
>> On 09.02.2012, at 15:28, Kevin Wolf wrote:
>> 
>>> Am 30.01.2012 23:29, schrieb Alexander Graf:
>>>> When using Windows 8 with an AHCI disk drive, it issues a blue screen.
>>>> The reason is that WIN_SECURITY_FREEZE_LOCK / CFA_WEAR_LEVEL is not
>>>> supported by our ATA implementation, but Windows expects it to be there.
>>> 
>>> Is there anything that makes Windows believe that we support it? The
>>> spec says bits in IDENTIFY word 82 and 128 must be set to indicate
>>> support for the security feature set, and we don't set those.
>>> 
>>> Might be just a Windows bug, of course...
>> 
>> IIUC it's mandatory in more recent ATA versions, so that's probably why it 
>> assumes it's there.
> 
> ACS-2 says it's optional for both ATA and ATAPI devices.

Ah, right. I was looking at the "Historical Command Assignments" table and 
figured C means it's required, but that of course is wrong.

Then I seriously have no idea why Windows is erroring out here. I mean, it does 
work just fine for IDE devices. And we don't tell the guest anything special 
for AHCI.


Alex