On Thu, Jul 11, 2013 at 12:00:54PM -0700, Chris Wright wrote: > * Guenter Roeck (li...@roeck-us.net) wrote: > > On Tue, Jul 09, 2013 at 04:22:52PM -0700, Chris Wright wrote: > > > One thing I've seen is the BIOS zeroing the base register address when > > > VT-d is disabled in BIOS. So, Guenter, a "fix" may be simply enabling > > > VT-d in the BIOS. > > > > > Ah, yes, I think I may have that disabled. I'll check it tonight. > > Did you find out if BIOS change fixed this? > No, it didn't. Enabling or disabling virtualization in the BIOS did not make a difference. It looks like there is a bad DMAR table entry (with address 0) in the ACPI data. In case you are interested how it looks like:
DMAR @ 0xcb3f3f90 0000: 44 4d 41 52 90 00 00 00 01 d5 49 4e 54 45 4c 20 DMAR......INTEL 0010: 44 48 38 37 52 4c 20 20 40 01 00 00 49 4e 54 4c DH87RL @...INTL 0020: 01 00 00 00 26 00 00 00 00 00 00 00 00 00 00 00 ....&........... 0030: 00 00 10 00 01 00 00 00 00 00 00 00 00 00 00 00 ................ 0040: 01 00 30 00 00 00 00 00 00 b0 eb cb 00 00 00 00 ..0............. 0050: ff 9f ec cb 00 00 00 00 01 08 00 00 00 00 1d 00 ................ 0060: 01 08 00 00 00 00 1a 00 01 08 00 00 00 00 14 00 ................ 0070: 01 00 20 00 00 00 00 00 00 00 00 d7 00 00 00 00 .. ............. 0080: ff ff 1f df 00 00 00 00 01 08 00 00 00 00 02 00 ................ Turns out the i7-4770K doesn't support VT-d, so my current understanding is that there should be no DMAR table in the first place. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
