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
